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Sample records for tomografia computadorizada tc

  1. Tomografia computadorizada no diagnóstico da otosclerose fenestral

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    Vicente Andy de Oliveira

    2004-01-01

    Full Text Available OBJETIVO: Identificar os principais achados tomográficos da otosclerose fenestral e avaliar a utilidade da tomografia computadorizada de alta resolução (TCAR, como método diagnóstico dessa osteodistrofia. FORMA DE ESTUDO: Estudo prospectivo multicêntrico com tomografia computadorizada (TC de ossos temporais. MATERIAL E MÉTODO: 54 pacientes com diagnóstico clínico e cirúrgico de otosclerose. Foi realizada uma análise tomográfica, em que foi avaliada a sensibilidade da TC no diagnóstico radiológico da otosclerose fenestral, sendo verificados os principais sítios de lesões dessa doença, como também a sua bilateralidade e simetria. Foram incluídos neste estudo 22 pacientes submetidos à TC de ossos temporais para investigação de outras afecções otológicas, que constituíram o grupo controle. RESULTADOS: A TC foi positiva em 87% dos pacientes (77% das orelhas. Os achados tomográficos foram bilaterais na maioria dos casos (78,7%, e o foco fenestral mais prevalente foi o foco anterior à janela oval (FAJO. CONCLUSÕES: A TC apresentou um alto índice de positividade e o FAJO foi o foco mais prevalente nessa população, podendo ser considerado um achado tomográfico altamente sugestivo de otosclerose.

  2. Criptococose pulmonar: aspectos na tomografia computadorizada

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    Silva Ana Carina Gamboa da

    2003-01-01

    Full Text Available A criptococose pulmonar é uma doença causada pelo Criptococcus neoformans, um fungo unimórfico que possui distribuição mundial, existindo na mesma forma tanto no seu habitat natural quanto em animais e humanos. A doença possui apresentações clínica e patológica variáveis e pode manifestar-se tanto em pacientes com a imunidade normal como em imunocomprometidos, que representam a maioria dos casos. Neste trabalho são analisados os aspectos encontrados nas tomografias computadorizadas do tórax de 14 pacientes com criptococose pulmonar confirmada. Os achados mais freqüentes na tomografia do tórax foram as massas e os nódulos pulmonares. Outros aspectos observados foram as áreas de escavação, as consolidações, o espessamento do interstício peribroncovascular e o reticulado difuso. Massa pulmonar foi o achado isolado mais comum (64,2%, seguido dos nódulos isolados ou múltiplos (35,7%. Doença pulmonar difusa foi vista em apenas 14,2% dos casos. Os lobos superiores foram os mais comprometidos, sendo a doença mais comum nas regiões anteriores. A tomografia do tórax permitiu avaliar com precisão o grau de comprometimento do parênquima pulmonar.

  3. Tomografia computadorizada das patologias acometendo o compartimento iliopsoas

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    Montandon Cristiano

    2001-01-01

    Full Text Available Este trabalho tem como objetivo revisar as patologias que acometem o compartimento iliopsoas. Foi realizada análise retrospectiva de casos com acometimento do compartimento iliopsoas avaliados por tomografia computadorizada (TC, no Departamento de Radiologia da Faculdade de Ciências Médicas da Universidade Estadual de Campinas, nos últimos dez anos, confirmados por biópsia cirúrgica ou percutânea. Os principais diagnósticos encontrados foram neoplasias, abscessos e hematomas. Os achados tomográficos baseiam-se na extensão do acometimento iliopsoas, no grau de atenuação, margens da lesão, presença de gás e/ou calcificações, destruição óssea, infiltração da gordura e acometimento de estruturas abdominais adjacentes. A TC é o método de escolha na avaliação do compartimento iliopsoas, podendo ser utilizada para orientar biópsias percutâneas, cirúrgicas ou drenagem. Porém, os achados isolados do estudo por TC, sem o conhecimento da história clínica, não são específicos para permitir a diferenciação das diversas patologias que acometem o compartimento iliopsoas.

  4. Tomografia computadorizada no seguimento de pacientes com tumores intracranianos

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    Gilberto Machado de Almeida

    1981-03-01

    Full Text Available A tomografia computadorizada tem grande valor no controle dos pacientes com tumores cerebrais. Imediatamente após o ato cirúrgico pode ser útil para avaliar a retirada do processo expansivo ou para comprovar a área atingida. Nos primeiros dias após a intervenção tem sido indicada principalmente quando há piora do quadro neurológico. Nestas condições, o exame permite verificar a existência de ar, edema, hematoma, desvios ventriculares e hidrocéfalo. Os dados fornecidos são mais precisos que os obtidos com outros exames neuror-radiológicos ou com a medida contínua da pressão intracraniana, métodos menos inócuos. A longo prazo a tomografia permite o diagnóstico precoce de recidivas, a avaliação da eficácia de tratamentos radio ou quimioterápicos e o controle do hidrocéfalo. Ainda não é possível fazer o diagnóstico diferencial entre radio-necrose e recidiva tumoral.

  5. Tomografia computadorizada aplicada a estudos de um Planossolo

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    Pedrotti Alceu

    2003-01-01

    Full Text Available Na busca de técnicas mais apuradas para a determinação e avaliação de parâmetros físicos do solo com aplicabilidade em várzeas, vem se destacando a tomografia computadorizada, por medir a densidade e a umidade com boa sensibilidade e alta resolução espacial. O presente trabalho teve como objetivo descrever aspectos e procedimentos da calibração de um minitomógrafo de raios-X e gama para estudo da densidade e umidade de um Planossolo no Rio Grande do Sul, bem como estabelecer parâmetros estatísticos para sua adequada utilização. A calibração do minitomógrafo foi obtida pela regressão linear entre as unidades tomográficas (UT, apresentadas pelo programa de reconstrução de imagem, e os coeficientes de atenuação linear (µl, cm-1, medidos por transmissão direta de raios gama, em amostras dos horizontes A e B do Planossolo, água destilada, benzina e alumínio. Para as medidas de transmissão direta de radiação utilizaram-se recipientes com água destilada, benzina, solo e Al, obtendo-se as seguintes fórmulas para o cálculo da densidade do solo no horizonte A: Ds = [(UT/986,16-(0,200xteta]/0,267; e no horizonte B: Ds = [(UT/986,16-(0,200xteta]/0,297, em que UT é o valor médio de UT em cada linha e teta é a umidade volumétrica da amostra de solo, em m³ m-3. Com as configurações obtidas, verificou-se variabilidade média de 2,74% e 0,73%, respectivamente, em termos de homogeneidade e repetibilidade. Os erros atribuídos ao equipamento são de 0,051 e 0,046 Mg m-3, respectivamente, nos horizontes A e B, revelando precisão e adaptabilidade no emprego da técnica em estudos do Planossolo.

  6. Tomografia Computadorizada de crânio em perícias criminais: uma grande aliada

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    Márcio Gleidson Ribeiro Dias

    2016-11-01

    Full Text Available O presente estudo trata-se de uma revisão descritiva da literatura sobre as principais vantagens da Tomografia Computadorizada (TC de crânio na área de Criminologia. Para a revisão literária foram utilizados artigos e dissertações recentes publicados entre 2007 e 2016, livros de imagenologia e medicina legal. A partir dos dados obtidos na revisão literária, nós realizamos uma descrição sobre a TC e sua evolução ao longo dos anos, suas vantagens e aplicações em perícias criminais. Destacamos a importância do laudo pericial, a responsabilidade do perito criminal, a fisiopatologia do trauma cranioencefálico e a sua relação com a violência urbana.Entre as vantagens da virtópsia em relação aos métodos tradicionais destacam-se a preservação do corpo, o arquivamento das imagens e a capacidade de identificação de vítimas através de imagens comparativas ante mortem e post mortem. Assim, a TC tem se tornado cada vez mais presente nas investigações criminais como uma tecnologia de baixo custo que é capaz de localizar, quantificar e evidenciar o trajeto de projéteis, auxiliando na identificação de cadáveres e causas da morte.

  7. Mudanças na estrutura do solo avaliada com uso de tomografia computadorizada.

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    PIRES, L. F.; BACCHI, O. O. S.

    2010-01-01

    O objetivo deste trabalho foi avaliar, em escala milimétrica, a modificação da densidade e da porosidade de amostras deformadas de solo submetidas a ciclos de umedecimento e secamento (U-S), por meio da tomografia computadorizada de raios gama. Amostras com 98,1 cm³ foram preparadas procedendo ao peneiramento do solo em malha de 2 mm e acondicionamento de forma homogênea em tubos de PVC. As amostras de solo foram submetidas a um, dois e três ciclos de U-S. As amostras controle não foram subme...

  8. Alterações no planejamento em implantodontia utilizando a tomografia computadorizada volumétrica

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    Pedroso, Ludmila Assunção de Mello

    2011-01-01

    O sucesso da reabilitação sobre implantes depende de um planejamento bem executado. Nesta fase, as características do sítio e as estruturas anatômicas adjacentes são avaliadas por meio do exame clínico e dos exames por imagem. A radiografia panorâmica é amplamente utilizada, mas recomenda-se que uma imagem seccional seja realizada. A tomografia computadorizada volumétrica (TCV) está entre os exames com maior indicação para essa avaliação. O objetivo deste trabalho foi verifi...

  9. Computerized tomography findings in Fahr's syndrome Achados da tomografia computadorizada na síndrome de Fahr

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    Andréia V. Faria

    2004-09-01

    Full Text Available We analyzed computerized tomography (CT findings in six patients with Fahr's syndrome. They presented calcifications in basal ganglia, dentate nucleus, subcortical region and semioval center, due to alteration in calcium metabolism or due to senile relative hypoxemic state. The image pattern was not strictly related with etiology, although some differences in dystrophic senile calcifications (the only one present in semioval center and absent in subcortical region. CT is an easy exam, has maximum sensitivity and allows diagnosis, contributing to early treatment of many etiologies of Fahr's syndrome.Analisamos os achados de tomografia computadorizada (TC de seis pacientes com síndrome de Fahr. Eles apresentaram calcificações nos gânglios da base, núcleo denteado, região subcortical e centro semi-oval, devidas a distúrbios no metabolismo do cálcio ou a estado de hipóxia relativa, por senilidade. O padrão de imagem não apresenta relação clara com a etiologia, apesar de algumas diferenças no caso das calcificações distróficas senis (as únicas presentes nos centros semi-ovais e ausentes na região subcortical. TC é um exame de fácil realização, máxima sensibilidade e permite o diagnóstico, contribuindo para o tratamento precoce de muitas das etiologias da síndrome de Fahr.

  10. Tomografia computadorizada do cranio no diagnostico dos meningiomas: registro de 16 casos

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    James Pitagoras de Mattos

    1983-03-01

    Full Text Available Os autores se referem à importância do emprego da tomografia computadorizada do crânio para o preciso diagnóstico dos meningiomas. Constam da experiência 16 casos, comprovados cirúrgica e histologicamente. A média de idade foi de 52,1 anos, sendo 10 pacientes do sexo feminino e 6 do masculino. Quanto à localização, 5 eram da cavidade orbitrária e/ou asa do esfenóide, 3 parasagitais, 3 da foice, 2 supra-selares, 2 de convexidade e 1 do tentório. Concluem tratar-se de exame de grande positividade (95-98%, praticamente inócuo e que permite, na atualidade, o diagnóstico precoce conduzindo, consequentemente, a melhores resultados terapêuticos.

  11. Histiocitoma fibroso benigno profundo: achados na tomografia computadorizada e histologia Deep benign fibrous histiocytoma: computed tomography and histology findings

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    Luciano Farage

    2005-04-01

    Full Text Available Apresentamos imagens de tomografia computadorizada de um paciente de 83 anos de idade com histiocitoma fibroso benigno profundo, na face lateral da perna esquerda, com evolução de longa data. À tomografia computadorizada observamos massa bem delimitada, ovalada, e que apresentava intenso realce periférico com uso do meio de contraste iodado. Este é um tumor de partes moles pouco freqüente e com raros relatos dos seus aspectos de imagem.We present the computed tomography images of an 83-year-old male patient with a deep benign fibrous histiocytoma at the lateral aspect of the left leg. Computed tomography images showed a well-defined mass with marked peripheral enhancement by iodinated contrast medium. Only few reports of this rare soft tissue tumor can be found in the literature.

  12. Tomografia computadorizada no diagnóstico da otosclerose retrofenestral Computed tomography in the diagnosis of retrofenestral otosclerosis

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    Andy de Oliveira Vicente

    2004-01-01

    Full Text Available OBJETIVO: Identificar os principais achados tomográficos da otosclerose retrofenestral. MÉTODO: Estudo prospectivo multicêntrico com tomografia computadorizada (TC de ossos temporais em 54 pacientes com diagnóstico clínico e cirúrgico de otosclerose. Foi realizada uma análise tomográfica, em que foi avaliada a utilidade da TC no diagnóstico radiológico da otosclerose retrofenestral, sendo verificados os principais sítios de lesões dessa doença. Foram incluídos neste estudo 22 pacientes submetidos à TC de ossos temporais para investigação de outras afecções otológicas, que constituíram o grupo controle. RESULTADOS: Os achados tomográficos foram bilaterais na maioria dos casos e o foco retrofenestral mais prevalente foi o foco pericoclear. CONCLUSÕES: A TC monstrou-se útil na identificação dos focos retrofenestrais. A evidência tomográfica desses focos juntamente com o envolvimento endosteal da cóclea podem sugerir uma maior atividade da doença.AIM: To identify the main tomographic findings of retrofenestral otosclerosis. METHODS: A prospective and multicentric study using computed tomography (CT of the temporal bone in 54 patients with a clinical and surgical diagnosis of otosclerosis. A tomographic analysis has been performed to evaluate the utility of CT scans in diagnosing retrofenestral otosclerosis, verifying the sites of predilection for otosclerotic lesions. In this study, 22 patients undergone CT scans of temporal bones have been included in order to investigate other otologic diseases and have constituted the control group. RESULTS: The tomographic findings were mostly bilateral and the retrofenestral focus more prevalent was the pericochlear focus. CONCLUSIONS: The CT scan was useful in the identification of the retrofenestral focuses. The evidence of this focuses and the presence of the endosteal involvement of the cochlea can suggest a higher activity of the disease.

  13. Estimativa dos valores de MSAD em procedimentos de tomografia computadorizada utilizando filmes radiocrômicos

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    Bruno Beraldo Oliveira

    2013-04-01

    Full Text Available OBJETIVO: Verificar a viabilidade de filmes radiocrômicos como um dosímetro alternativo para estimativa da dose média em cortes múltiplos a partir dos perfis de kerma. MATERIAIS E MÉTODOS: Os filmes foram distribuídos em cilindros posicionados no centro e nas regiões periféricas de um objeto simulador padrão de abdome utilizado para dosimetria em tomografia computadorizada. RESULTADOS: Os valores de dose média em cortes múltiplos calculados foram 13,6 ± 0,7, 13,5 ± 0,7 e 18,7 ± 1,0 mGy para os valores de passo (pitch de 0,75, 1,00 e 1,50, respectivamente. CONCLUSÃO: Apesar de os resultados mostrarem valores menores que o nível de referência de radiodiagnóstico de 25 mGy estabelecido pela legislação brasileira para exames de abdome, eles sugerem que há espaço para otimização dos procedimentos e uma revisão do valor para o nível de referência de radiodiagnóstico brasileiro.

  14. Trauma dos ossos temporais e suas complicações: aspectos na tomografia computadorizada

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    Ana Maria Doffémond Costa

    2013-04-01

    Full Text Available A maioria das fraturas dos ossos temporais resulta de traumas cranianos bruscos, de alta energia, estando muitas vezes relacionadas a outras fraturas cranianas ou a politraumatismo. As fraturas e os deslocamentos da cadeia ossicular, na orelha média, representam umas das principais complicações das injúrias nos ossos temporais e, por isso, serão abordadas de maneira mais profunda neste artigo. Os outros tipos de injúrias englobam as fraturas labirínticas, fístula dural, paralisia facial e extensão da linha de fratura ao canal carotídeo. A tomografia computadorizada tem papel fundamental na avaliação inicial dos pacientes politraumatizados, pois é capaz de identificar injúrias em importantes estruturas que podem causar graves complicações, como perda auditiva de condução ou neurossensorial, tonturas e disfunções do equilíbrio, fístulas perilinfáticas, paralisia do nervo facial, lesões vasculares, entre outras.

  15. Malária pulmonar: aspectos na tomografia computadorizada de alta resolução - relato de caso

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    Rodrigues Rosana

    2004-01-01

    Full Text Available Neste trabalho é relatado o caso de paciente do sexo masculino, de 38 anos de idade, que desenvolveu quadro de malária com comprometimento pulmonar. A tomografia computadorizada de alta resolução evidenciou espessamento de septos interlobulares e de bainhas peribroncovasculares, com áreas esparsas de atenuação em vidro fosco e de consolidações, além de derrame pleural bilateral, aspectos compatíveis com edema pulmonar. O paciente recebeu tratamento específico, evoluindo bem e tendo alta 11 dias após a internação.

  16. Tomografia computadorizada das células etmoidais intra e extramurais: ensaio iconográfico

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    Fabrício Guimarães Gonçalves

    2011-10-01

    Full Text Available O desenvolvimento dos seios paranasais é um processo intricado que se inicia na vida intrauterina e termina na idade adulta. Dos seios da face, as células etmoidais são provavelmente as estruturas mais complexas e as que estão associadas com o maior número de variantes da normalidade. Variações no padrão de pneumatização das células etmoidais podem ser divididas em intra ou extramurais. Intramurais são aquelas que ao se desenvolverem mantêm contato com o labirinto etmoidal, e extramurais as que se desenvolvem isoladamente. A tomografia computadorizada é a ferramenta mais útil na avaliação de processos inflamatórios dos seios paranasais. De igual modo, ela é importante para o planejamento pré-operatório e controle pós-operatório, pois possibilita grande detalhe anatômico das estruturas normais e detecção precisa de suas variantes. Neste ensaio iconográfico os autores descrevem as principais variantes da normalidade do labirinto etmoidal e suas relações com estruturas adjacentes. Cirurgias endoscópicas para o tratamento de afecções dos seios paranasais têm-se tornado cada vez menos invasivas, o que certamente aumentará a demanda por relatórios de imagem cada vez mais ricos em detalhes desta região.

  17. Avaliação da reprodutibilidade da tomografia computadorizada no estadiamento da pancreatite aguda Reproducibility in the assessment of acute pancreatitis with computed tomography

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    Edison de Oliveira Freire Filho

    2007-12-01

    Full Text Available OBJETIVO: Medir a reprodutibilidade da tomografia computadorizada sem e com contraste na avaliação da gravidade da pancreatite aguda. MATERIAIS E MÉTODOS: Cinqüenta e um exames de tomografia computadorizada abdominal sem e com contraste de pacientes com pancreatite aguda foram analisados por dois radiologistas (observadores 1 e 2. Calculamos o índice morfológico pela tomografia computadorizada sem e com contraste, separadamente, e o índice de gravidade da tomografia computadorizada para pancreatite aguda. Medimos a reprodutibilidade intra- e interobservador da tomografia computadorizada através do índice kappa (kapa. RESULTADOS: Para a concordância interobservador obtivemos kapa de 0,666, 0,705, 0,648, 0,547 e 0,631 para índice morfológico sem e com contraste, presença de necrose pancreática, extensão da necrose pancreática e índice de gravidade da tomografia computadorizada, respectivamente. Para a concordância intra-observador dos observadores 1 e 2 obtivemos, respectivamente, kapa de 0,796 e 0,732 para o índice morfológico sem contraste; 0,725 e 0,802 para o índice morfológico com contraste; 0,674 e 0,849 para a presença de necrose pancreática; 0,606 e 0,770 para a extensão da necrose pancreática; e 0,801 e 0,687 para o índice de gravidade da tomografia computadorizada. CONCLUSÃO: O estadiamento da pancreatite aguda pela tomografia computadorizada por meio do índice morfológico e do índice de gravidade da tomografia computadorizada é um método bastante reprodutível. O não-uso do contraste não afeta a reprodutibilidade da tomografia computadorizada para o cálculo do índice morfológico.OBJECTIVE: To evaluate the reproducibility of unenhanced and contrast-enhanced computed tomography in the assessment of patients with acute pancreatitis. MATERIALS AND METHODS: Fifty-one unenhanced and contrast-enhanced abdominal computed tomography studies of patients with acute pancreatitis were blindly reviewed by two

  18. Tomografia computadorizada em pacientes portadores de neurocisticercose com hipertensão intracraniana por hidrocefalia obstrutiva: comparação com ventriculografia com Dimer-X

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    Benedicto Oscar Colli

    1984-06-01

    Full Text Available Estudo das alterações observadas nas tomografias computadorizadas (TCs de 16 casos de neurocisticercose, com hipertensão intracraniana por hidrocefalia. Todos os casos foram submetidos a radiografias simples do crânio e 12, à ventriculografia com Dimer-X. Nas radiografias simples foram observados sinais de hipertensão intracraniana em 7, calcificações em um, e d foram normais. A TC mostrou parênquima cerebral normal em 9 casos e nos 7 restantes áreas hipodensas arredondadas de tamanho variado, com ou sem retenção de contraste na periferia, e/ou calcificações esparsas no parenquima. Hidrocefalia foi a única alteração observada no sistema ventricular nos casos em que o exame foi realizado previamente à derivação do LCR. As ventriculografias foram analisadas em trabalho anterior e permitiram localizar e determinar as características da obstrução e a presença de massas ocupando espaço dentro dos ventrículos. A comparação das ventriculografias e TCs realizadas na mesma época evidenciou que a primeira fornece melhores informações sobre o sistema ventricular mas, por outro lado, a tomografia fornece informações adicionais sobre o parênquima cerebral. A TC e a ventriculografia são exames que se completam na avaliação e no diagnóstico destes pacientes.

  19. Lesões traumáticas do tórax. Aspectos na tomografia computadorizada

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    Alessandro Severo Alves de Melo

    2004-09-01

    Full Text Available RESUMO: O trauma representa, no mundo actual, uma das principais causas de morte, e o acometimento torácico significa um importante agravamento nas vítimas de trauma multi-sistémico. Neste trabalho foram estudados os aspectos tomográficos de 200 pacientes com trauma torácico. As lesões pulmonares predominaram, tendo sido observadas em 192 casos (96%, manifestadas sob a forma de contusões em 178 casos (89%, atelectasias em 41 casos (20,5%, lacerações em 15 casos (7,5% e hematomas em 6 casos (3%. Lesões pleurais foram demonstradas em 140 casos (70%, dos quais em 121 casos (60,5% havia hemotórax e em 84 casos (42% pneumotórax. As lesões mediastínicas estiveram presentes em 28 casos (14%, com pneumomediastino em 18 (9%, hematoma mediastínico em 7 casos (3,5%, hemopericárdio em 4 (2% e lesões da aorta em 3 (1,5%. As lesões diafragmáticas foram observadas em 8 pacientes (4%. O enfisema de partes moles foi demonstrado em 36 casos (18%.REV PORT PNEUMOL 2004; X (5: 393-403 ABSTRACT: Trauma is nowadays one of the most common causes of death and traumatic thoracic lesions are important agravant to trauma patients. In this work the aspects of computed tomography from 200 cases of thoracic trauma were studied. Lung lesions predominated, found in 192 cases (96%, manifested as contusions in 178 cases (89%, atelectasis in 41 cases (20,5%, lacerations in 15 cases (7,5% and hematomas in 6 cases (3%. Pleural lesions were showed in 140 cases (70%, among them in 121 cases (60,5% there were hemothorax and in 84 cases (42%, pneumothorax. Mediastinal lesions were observed in 28 cases (14%, with pneumomediastinum in 18 cases (9%, mediastinal hematoma in 7 cases (3,5%, hemopericardium in 4 cases (2% and aortic lesions in 3 cases (1,5%. Diaphragmatic rupture was seen in 8 pacients (4%. Soft tissue emphysema was demonstrated in 36 cases (18%.REV PORT PNEUMOL 2004; X (5: 393-403 Palavras-chave: Tórax, tomografia computadorizada, trauma torácico, Key

  20. Apendicite aguda: achados na tomografia computadorizada - ensaio iconográfico Acute appendicitis: computed tomography findings - an iconographic essay

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    Marcelo Eustáquio Montandon Júnior

    2007-06-01

    Full Text Available A apendicite aguda é a causa mais comum de dor abdominal aguda que requer intervenção cirúrgica no mundo ocidental. O diagnóstico precoce é essencial para minimizar a morbidade da doença. O uso dos métodos de imagem significou grande avanço no diagnóstico desta entidade, até então avaliada apenas com base na história clínica, exame físico e dados laboratoriais, haja vista que 20% a 33% dos pacientes apresentam sintomas atípicos. O diagnóstico é mais difícil nas crianças, nos idosos e nas mulheres em idade fértil. Os principais métodos de imagem para sua avaliação são a ultra-sonografia e a tomografia computadorizada. Os objetivos deste trabalho são: descrever a fisiopatologia da doença, comentar os principais aspectos técnicos da tomografia computadorizada, demonstrar e ilustrar os achados tomográficos e citar os principais diagnósticos diferenciais.Acute appendicitis is the most important cause of abdominal pain requiring surgical intervention in the Western world. The early diagnosis of this disease is of paramount relevance for minimizing its morbidity. Imaging methods have represented a huge progress in the diagnosis of this entity, which used to be based essentially on clinical history, physical examination and laboratory tests results, considering that 20% to 33% of patients present with atypical symptoms. Diagnostic difficulty is higher in children, the elderly, and women in childbearing age. The main imaging methods for evaluation of acute appendicitis are ultrasound and computed tomography. The present study is aimed at describing the disease physiopathology, commenting main computed tomography technical aspects, demonstrating and illustrating tomographic findings, and describing main differential diagnoses.

  1. LINFOMAS PULMONARES: CORRELAÇÃO DA TOMOGRAFIA COMPUTADORIZADA DE ALTA RESOLUÇÃO COM A ANATOMOPATOLOGIA

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    Marchiori Edson

    2002-01-01

    Full Text Available Neste trabalho são descritos os aspectos tomográficos de alta resolução dos linfomas pulmonares e feita correlação com os achados anatomopatológicos. Com este objetivo, foram revisados as tomografias computadorizadas de alta resolução do tórax e os dados histopatológicos de dez pacientes com diagnóstico confirmado de linfoma não-Hodgkin ou de doença de Hodgkin. Os resultados obtidos foram confrontados com os descritos na literatura. Os achados radiológicos mais comumente vistos neste estudo foram as consolidações parenquimatosas, localizadas, com broncogramas aéreos de permeio (n = 8. Em menor freqüência, foram encontrados múltiplos nódulos parenquimatosos (n = 4, espessamento peribroncovascular (n = 3 e opacidades em vidro fosco (n = 2. Na correlação com a anatomia patológica, as consolidações corresponderam a preenchimento alveolar por células neoplásicas, o espessamento peribroncovascular se deveu a infiltração das bainhas peribroncovasculares por células linfomatosas e a atenuação em vidro fosco se associou com infiltração dos septos alveolares por tais células.

  2. Radiograma de tórax e tomografia computadorizada na avaliação do enfisema pulmonar Chest X-ray and computed tomography in the evaluation of pulmonary emphysema

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    Klaus Loureiro Irion

    2007-12-01

    Full Text Available O enfisema é uma condição do pulmão, caracterizada pelo aumento acima do normal no tamanho dos espaços aéreos distais ao bronquíolo terminal. Atualmente, o enfisema é a quarta causa de morte nos EUA, afetando 14 milhões de pessoas. O presente artigo descreve as principais ferramentas no diagnóstico por imagem do enfisema, desde o início até os dias de hoje. Relata as técnicas tradicionais, como radiograma de tórax, e as evoluções no campo da tomografia computadorizada (TC, como a TC de alta resolução e a densitovolumetria pulmonar por TC tridimensional.Emphysema is a condition of the lung, characterized by the abnormal increase in the size of the airspace distal to the terminal bronchioles. Currently, emphysema is the fourth leading cause of death in the USA, affecting 14 million people. The present article describes the principal tools in the imaging diagnosis of emphysema, from the early days until the present. We describe traditional techniques, such as chest X-ray, together with the evolution of computed tomography (CT to more advanced forms, such as high resolution CT, as well as three-dimensional CT densitometry and volumetric assessment.

  3. Tomografia computadorizada e ressonância magnética nos oligodendrogliomas: correlação clínica e patológica

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    Simão Marcelo Novelino

    2001-01-01

    Full Text Available Oligodendrogliomas são neoplasias do tecido neuroepitelial glial originárias de oligodendrócitos. São tumores infreqüentes, responsáveis por cerca de 4% a 7% das neoplasias primárias do cérebro, predominantemente supratentoriais. O presente trabalho consistiu na avaliação dos achados de imagem pré-operatória em tomografia computadorizada e ressonância magnética e correlação clínica e patológica, levando-se em consideração a presença de tumores puros ou mistos, com componente astrocitário e o seu grau de anaplasia. O aspecto mais freqüente foi o de lesão hipodensa na tomografia computadorizada ou com hipossinal em T1 e hipersinal em T2 na ressonância magnética, podendo ter componente cístico, com pouco edema ao redor, apresentando calcificações, quase sempre grosseiras, em dois terços dos casos. Reforço após contraste ocorre em 80% dos casos, na maioria discreto.

  4. Tomografia computadorizada sem contraste intravenoso no abdome agudo: quando e por que usar When and why use unenhanced computed tomography in patients with acute abdomen

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    Edison de Oliveira Freire Filho

    2006-02-01

    Full Text Available A tomografia computadorizada sem contraste intravenoso tem sido freqüentemente proposta na avaliação inicial de pacientes com suspeita de abdome agudo, ocupando o espaço de outros métodos diagnósticos. Os autores apresentam uma revisão bibliográfica dos principais aspectos e eficácia da tomografia computadorizada sem contraste intravenoso no diagnóstico de apendicite aguda, cólica nefrética, diverticulite, pancreatite aguda, apendicite epiplóica, pneumoperitônio e obstrução intestinal. Discutem quais as vantagens e limitações desta técnica de exame, bem como seus aspectos práticos.The use of unenhanced computed tomography has been frequently recommended for the initial assessment of patients with clinical suspicion of acute abdomen instead of other diagnostic methods. The authors present a review of the literature on the main aspects, advantages, limitations and efficacy of unenhanced computed tomography for the diagnosis of acute appendicitis, renal colic, diverticulitis, acute pancreatitis, primary epiploic appendicitis, pneumoperitoneum and small bowel obstruction. The advantages and limitations of this technique are also discussed.

  5. Esclerose sistêmica progressiva: aspectos na tomografia computadorizada de alta resolução Progressive systemic sclerosis: high-resolution computed tomography findings

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    Emerson L. Gasparetto

    2005-09-01

    Full Text Available OBJETIVO: Descrever os achados de tomografia computadorizada de alta resolução de pacientes com esclerose sistêmica pulmonar, independentemente dos sintomas respiratórios. MATERIAIS E MÉTODOS: Foram revisados 73 exames de tomografia computadorizada de alta resolução de 44 pacientes com diagnóstico de esclerodermia estabelecido através de critérios clínicos e laboratoriais. Os exames foram revisados por dois radiologistas, que estabeleceram os achados por consenso. RESULTADOS: Em 91,8% (n = 67 dos exames observaram-se alterações. Os principais achados foram lesões de padrão reticular (90,4%, opacidades em vidro-fosco (63%, bronquiectasias e bronquiolectasias de tração (56,2%, dilatação esofagiana (46,6%, faveolamento (28,8% e sinais de hipertensão pulmonar (15,6%. Na maioria dos casos as lesões eram bilaterais (89% e simétricas (58,5%. Quanto à localização, houve predomínio de lesões basais (91,2% e periféricas (92,2%. CONCLUSÃO: A esclerose sistêmica progressiva acarreta fibrose pulmonar na maioria dos pacientes, caracterizada principalmente por lesão reticular basal e periférica.OBJECTIVE: To describe the high-resolution computed tomography findings in the lung of patients with systemic sclerosis, independently of the respiratory symptoms. MATERIALS AND METHODS: Seventy-three high-resolution computed tomography scans of 44 patients with clinical diagnosis of systemic sclerosis were reviewed and defined by the consensus of two radiologists. RESULTS: Abnormalities were seen in 91.8% (n = 67 of the scans. The most frequent findings were reticular pattern (90.4%, ground-glass opacities (63%, traction bronchiectasis and bronchiolectasis (56.2%, esophageal dilatation (46.6%, honeycombing pattern (28.8% and signs of pulmonary hypertension (15.6%. In most cases the lesions were bilateral (89% and symmetrical (58.5%. The lesions were predominantly located in the basal (91.2% and peripheral (92.2% regions. CONCLUSION: In

  6. Nasoangiofibroma juvenil: concordância interobservadores no estadiamento por tomografia computadorizada Juvenile nasopharyngeal angiofibroma: interobserver agreement in cancer staging using computed tomography

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    Jefferson Luiz Gusso

    2001-08-01

    Full Text Available Com o advento da tomografia computadorizada, a avaliação dos locais de acometimento e extensão do nasoangiofibroma juvenil tornou-se mais precisa, o que facilitou o correto estadiamento pré-operatório. O objetivo deste trabalho é avaliar a concordância interobservadores, por meio da análise por tomografia computadorizada, de 15 casos de nasoangiofibroma juvenil em relação à extensão para locais relacionados com altos índices de recidivas. Todos os pacientes eram do sexo masculino, com idade média de 15,8 anos. A análise da concordância entre os observadores quanto à extensão e envolvimento da fossa infratemporal, seios esfenóide e cavernoso e fossa craniana média foi excelente, em relação à fissura orbitária superior foi boa e em relação à base do processo pterigóide e fossa craniana anterior foi ruim. Concluiu-se que a análise apresenta alta concordância entre os observadores para os locais estabelecidos, com exceção da base do processo pterigóide e da fossa craniana anterior.The advent of computed tomography permitted a much more precise evaluation of tumor localization, thus facilitating presurgical staging. The objective of this study was to evaluate the interobserver agreement on the analysis of computed tomography scans of 15 patients with juvenile nasopharyngeal angiofibroma, regarding assessment of tumor extension to sites of high recurrence rate. All patients were male and had a mean age of 15.8 years. The results of the interobserver agreement analysis regarding tumor invasion and extension to the infratemporal fossa, cavernous sinus, sphenoid sinus and medium cranial fossa were excellent. Identification of involvement of the superior orbital fissure was considered good. Interobserver agreement regarding tumor extension to the base of pterigoid process and anterior cranial fossa was considered poor. We concluded that there is a very good interobserver agreement on the evaluation of the established

  7. Avaliação da concordância interobservadores na análise da polipose nasossinusal por meio da tomografia computadorizada Evaluation of the concordance between observers in sinunasal polyposis through computed tomographic analysis

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    Elaine A. Mendes

    2004-08-01

    Full Text Available Polipose nasossinusal (PNS é uma entidade de etiologia controversa, caracterizada por uma condição inflamatória da superfície mucosa das fossas nasais e seios paranasais, bilateralmente. A queixa principal do paciente consiste na obstrução nasal e, ao exame físico, observam-se freqüentemente massas polipóides ocupando as cavidades nasais em extensões variáveis. Além da rinoscopia anterior e da endoscopia nasal, o uso da tomografia computadorizada (TC torna-se necessário para avaliação das fossas nasais e da presença ou não do acometimento dos seios paranasais por essas massas, bem como a sua extensão. Este trabalho tem como objetivo avaliar a concordância interobservadores, por meio da análise da tomografia computadorizada, de 32 casos de PNS. FORMA DE ESTUDO: Clínico prospectivo. CASUÍSTICA E MÉTODOS: Foram avaliadas 32 TC de pacientes portadores PNS por dois observadores experientes, separadamente, em relação à presença ou não de 3 sinais tomográficos sugestivos dessa doença: (1 alargamento infundibular do complexo ostiomeatal, (2 abaulamento lateral da lâmina papirácea e (3 apagamento do trabeculado ósseo etmoidal. RESULTADOS: Observou-se Qui-quadrado não significante para o primeiro e segundo sinais (p=0,7055 e p=0,2057 e significante para o terceiro (p=0,0040. Contudo, o coeficiente de correlação de Kendall entre os dois observadores foi significante para os três sinais tomográficos acima citados (pSinonasal polyposis (SNP is a condition with a controversial aethiology, known by bilaterally inflammatory mucous membranes of nasal and paranasal sinuses. The major patient's complaint is nasal obstruction, and polypoid masses in different sizes can be found during nasal cavity examination. Beyond anterior rhinoscophy and nasal endoscopy, screening sinus computed tomography (SSCT is necessary to measure the size and the extent of the polyps into nasal cavities and paranasal sinuses. The purpose of this

  8. Detecção de fraturas radiculares em imagens de tomografia computadorizada de feixe cônico utilizando diferentes parâmetros de exposição e materiais intracanais

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    Pinto, Martina Gerlane de Oliveira

    2015-01-01

    O objetivo deste estudo foi avaliar a detecção de fraturas radiculares (FRs) em imagens de Tomografia Computadorizada de Feixe Cônico (TCFC) utilizando diferentes parâmetros de exposição e analisar a influência da guta- percha, do núcleo metálico fundido e do pino de fibra de vidro no diagnóstico das FRs, assim como a formação de artefatos em TCFC. Cento e sessenta dentes foram selecionados e divididos em quatro grupos de acordo com o material de preenchimento (sem guta-percha, com guta-perch...

  9. Biópsia percutânea de lesões ósseas guiada por tomografia computadorizada: taxas de definição diagnóstica e complicações

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    Macello Jose Sampaio Maciel

    2014-10-01

    Full Text Available Objetivo: Determinar taxas de definição diagnóstica e complicações da biópsia percutânea guiada por tomografia computadorizada (TC de lesões ósseas suspeitas de malignidade. Materiais e Métodos: Estudo retrospectivo que incluiu 186 casos de biópsia percutânea guiada por TC de lesões ósseas no período de janeiro de 2010 a dezembro de 2012. Todas as amostras foram obtidas usando agulhas de 8 a 10 gauge. Foram coletados dados demográficos, história de neoplasia maligna prévia, dados relacionados à lesão, ao procedimento e ao resultado histológico. Resultados: A maioria dos pacientes era do sexo feminino (57% e a idade média foi 53,0 ± 16,4 anos. Em 139 casos (74,6% a suspeita diagnóstica era metástase e os tumores primários mais comuns foram de mama (32,1% e próstata (11,8%. Os ossos mais envolvidos foram coluna vertebral (36,0%, bacia (32,8% e ossos longos (18,3%. Houve complicações em apenas três pacientes (1,6%, incluindo uma fratura, um caso de parestesia com comprometimento funcional e uma quebra da agulha necessitando remoção cirúrgica. Amostras de 183 lesões (98,4% foram consideradas adequadas para diagnóstico. Resultados malignos foram mais frequentes nos pacientes com suspeita de lesão secundária e história de neoplasia maligna conhecida (p < 0,001 e nos procedimentos orientados pela PET/CT (p = 0,011. Conclusão: A biópsia percutânea guiada por TC é segura e eficaz no diagnóstico de lesões ósseas suspeitas.

  10. Calcificação nos núcleos da base na tomografia computadorizada: correlação clínica em 25 pacientes consecutivos Basal ganglia calcification on computed tomography: clinical characteristics in 25 patients

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    Glória Maria A.S. Tedrus

    2006-03-01

    Full Text Available Analisamos os aspectos clínicos de 25 pacientes consecutivos que apresentaram calcificação nos núcleos da base na tomografia computadorizada (TC de crânio. Esta ocorreu em 0,68% de todos os exames realizados no período. Vinte e três pacientes apresentavam condições clínicas diversas, a saber: cefaléia em 7 casos, acidente vascular cerebral em 5, síndrome extrapiramidal em 2, processo expansivo cerebral em 2, epilepsia, retardo do desenvolvimento neuropsicomotor, demência e trauma de crânio em um caso cada ou outras condições neurológicas em 3. Não havia sintomas neurológicos em 2 casos. Em 15 pacientes (60,0% havia, além da calcificação dos núcleos da base, outras alterações na TC. Correlação clínica foi observada apenas com as outras alterações da TC e não com a calcificação dos núcleos da base, corroborando a hipótese de que esta possa ser um achado incidental.Twenty-five patients presenting basal ganglia calcification were assessed. This finding comprised 0.68% of all skull CT scan carried out during the period. Two patients were neurologically asymptomatic and 23 presented a variety neurological disorders - headache (7 patients, stroke (5 patients, extrapyramidal syndromes (2 patients, tumor (2 patients, epilepsy (1 patient, mental retardation (1 patient, dementia (1 patient, cranial trauma (1 patient, other neurological conditions (3 patients - or were asymptomatic from the neurological point of view (2 patients. Findings in the CT scan other than the basal ganglia calcification were observed in 15 (60% patients. There was a clinical-CT scan correlation in these cases but not in those in which the basal ganglia calcification was an isolated finding. This study highlights the fact that basal ganglia calcification is often a nonspecific finding on CT scan and that it may not be possible to establish a clinical-pathological correlation between them.

  11. Edema pulmonar hidrostático: aspectos na tomografia computadorizada de alta resolução Hydrostatic pulmonary edema: high-resolution computed tomography aspects

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    Cláudia Maria Cunha Ribeiro

    2006-12-01

    Full Text Available OBJETIVO: A proposta deste estudo foi caracterizar por meio de tomografia computadorizada de alta resolução do tórax as principais alterações pulmonares do edema pulmonar hidrostático. MÉTODOS: Foram analisadas, retrospectivamente, as tomografias de quinze pacientes com quadro clínico de edema pulmonar hidrostático, divididos em cinco principais grupos etiológicos: insuficiência cardíaca congestiva, valvulopatia mitral aguda, infarto agudo do miocárdio, miocardite e mediastinite fibrosante, tendo sido sete pacientes classificados no primeiro grupo e dois em cada um dos demais. RESULTADOS: Os principais achados do edema hidrostático foram opacidades em vidro fosco (100%, espessamento dos septos interlobulares (100%, derrame pleural (87% e espessamento do interstício peribroncovascular (80%. Outros achados menos comuns foram aumento do calibre dos vasos, consolidações e nódulos do espaço aéreo. CONCLUSÃO: O padrão predominante encontrado nos pacientes estudados foi o de opacidades em vidro fosco associadas a espessamento dos septos interlobulares (padrão de pavimentação em mosaico, com derrame pleural bilateral, predominante à direita.OBJECTIVE: This study aimed to use high-resolution computed tomography scans of the chest to characterize the principal alterations occurring in cases of hydrostatic pulmonary edema. METHODS: A retrospective analysis was made of the tomography scans of 15 patients presenting clinical profiles of hydrostatic pulmonary edema. The cases were divided into five groups by etiology: congestive heart failure (n = 7; acute mitral valve disease (n = 2; acute myocardial infarction (n = 2; myocarditis (n = 2; and fibrosing mediastinitis (n = 2. RESULTS: The principal findings in the cases of hydrostatic pulmonary edema were ground-glass opacities (in 100%, interlobular septal thickening (in 100%, pleural effusion (in 87% and peribronchovascular interstitial thickening (in 80%. Other, less common

  12. O valor da fase sem contraste na tomografia computadorizada do abdome The role of the unenhanced phase in the routine abdominal computed tomography

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    Ana Paula Klautau Leite

    2008-10-01

    Full Text Available OBJETIVO: Determinar o valor agregado da fase sem meio de contraste da tomografia computadorizada do abdome em pacientes sem diagnóstico determinado ou em estadiamento tumoral. MATERIAIS E MÉTODOS: Estudo prospectivo e transversal em 100 pacientes consecutivos submetidos a tomografia computadorizada abdominal sem e com meio de contraste intravenoso. Dois examinadores avaliaram todos os exames, procurando estabelecer, através da fase com meio de contraste intravenoso (primeira análise e posteriormente através da fase sem contraste (segunda análise, o diagnóstico principal e os secundários em função da indicação clínica do exame. Mediu-se a freqüência de mudança diagnóstica decorrente da análise combinada das fases pré- e pós-contraste intravenoso. Casos que tiveram mudança diagnóstica foram avaliados por especialistas clínicos para determinar se implicaria mudanças de conduta. RESULTADOS: Diagnósticos principal e secundário foram modificados em 1 e 18 casos, respectivamente (p = 1,000; p = 0,143. Os diagnósticos modificados foram: esteatose, definição de nódulo em adrenal, nefrolitíase, classificação de cistos renais e calcificação hepática. Nos casos em que a fase sem contraste modificou o diagnóstico, os especialistas mudaram sua conduta em 14/19 (73% dos pacientes (p = 0,038. CONCLUSÃO: A fase sem contraste não modificou significativamente o diagnóstico principal ou secundário. Porém, as mudanças nos diagnósticos secundários influenciaram na conduta adotada pelos especialistas.OBJECTIVE: To determine the role of the unenhanced phase of abdominal computed tomography in patients without a definite diagnosis or undergoing tumor staging. MATERIALS AND METHODS: A prospective and transversal study was developed with 100 consecutive patients submitted to unenhanced and contrast-enhanced abdominal computed tomography. Two observers evaluated all the computed tomography images in the contrast-enhanced phase

  13. Aspectos da tomografia computadorizada no linfoma em pacientes abaixo de 20 anos de idade Computed tomography findings in patients less than 20 years old with lymphoma

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    Adriana Moreira Viana Borba

    2007-04-01

    Full Text Available OBJETIVO: Descrever os achados gerais do linfoma em pacientes abaixo de 20 anos de idade e por subtipo histológico. MATERIAIS E MÉTODOS: Estudo retrospectivo do arquivo digital de tomografia computadorizada do Centro de Controle do Câncer do Hospital Universitário Pedro Ernesto da Universidade do Estado do Rio de Janeiro, no período de março de 2003 a julho de 2005. Dos 22 casos - 16 do sexo masculino e 6 do sexo feminino, com média de idade de 11,5 anos -, 12 eram do subtipo Hodgkin e 10 eram não-Hodgkin. RESULTADOS: Dos achados gerais, verificamos as linfonodomegalias mediastinais como o mais freqüente (59%, com predomínio no grupo Hodgkin (75%, seguido por hepatoesplenomegalia (50% e linfonodomegalias cervicais e retroperitoneais (27,3%. No subtipo Hodgkin houve predomínio do acometimento linfonodal, em sucessivas cadeias, seguido pela hepatoesplenomegalia (50%. Verificamos um caso de massa tonsilar unilateral, opacidade pulmonar em "vidro-fosco" e nódulos renais. No subtipo não-Hodgkin houve predomínio extranodal caracterizado por hepatoesplenomegalia (50%, espessamento de alça intestinal (40%, derrame pleural (30%, nódulo pulmonar (20%, ascite (10%, derrame pericárdico (10% e lesões ósseas mistas (10%. CONCLUSÃO: A tomografia computadorizada é de grande valia no diagnóstico, estadiamento e seguimento do linfoma, com achados de alerta como massa linfonodal, notadamente mediastinal, hepatoesplenomegalia, massa unilateral na tonsila e espessamento parietal de alça intestinal.OBJECTIVE: To describe the general findings of lymphoma and their histological patterns in patients less than 20 years old. MATERIALS AND METHODS: Twenty-two cases (16 male and 6 female, mean age 11.5 years from the digital archive of computed tomography at the Cancer Control Center of "Hospital Universitário Pedro Ernesto - Universidade do Estado do Rio de Janeiro", Rio de Janeiro, RJ, Brazil, were retrospectively analyzed in the period between

  14. Lesões traumáticas do parênquima pulmonar: aspectos na tomografia computadorizada Traumatic lung lesions: computed tomography findings

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    Alessandro Severo Alves de Melo

    2003-06-01

    Full Text Available As lesões pulmonares são achados freqüentes no trauma torácico, sendo cada vez mais diagnosticadas pela tomografia computadorizada, em especial pelo rápido tempo de aquisição decorrente da técnica helicoidal, que permite a avaliação de pacientes em estado grave, possibilitando a adoção de conduta terapêutica eficiente. Os autores estudaram 150 pacientes vítimas de trauma torácico submetidos a tomografia computadorizada, que apresentaram lesões pulmonares, representadas por contusões, atelectasias, lacerações e hematomas pulmonares. As contusões pulmonares se caracterizaram por consolidações e atenuação em vidro fosco, sendo as lesões pulmonares mais comuns. As atelectasias foram observadas com os padrões subsegmentar e compressiva, e foram a segunda lesão mais comum. As lacerações se apresentaram como consolidações com ar ou nível líquido no interior. Os hematomas pulmonares representaram a lesão pulmonar mais rara, presentes em apenas cinco casos, caracterizados por opacidades arredondadas. Neste trabalho o trauma torácico fechado predominou, com 120 casos, enquanto o trauma aberto ocorreu em 30 casos. As causas de trauma fechado, em ordem decrescente de freqüência, foram: colisão automobilística, atropelamento, queda de altura, acidente de motocicleta e espancamento. A forma penetrante de traumatismo torácico decorreu de duas causas de agressão: lesão por arma de fogo e lesão por arma branca.Traumatic lesions of the lung are common findings in patients with thoracic trauma. These lesions are increasingly diagnosed using computed tomography, mostly due to the fast acquisition time helical techniques that allow evaluation of critically ill patients and an efficient therapeutic management. The authors studied 150 patients with thoracic trauma submitted to computed tomography that demonstrated lung contusions, atelectasies, lacerations and hematomas. Lung contusions were the most frequent lesions

  15. Trauma dos ossos temporais e suas complicações: aspectos na tomografia computadorizada Temporal bone trauma and complications: computed tomography findings

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    Ana Maria Doffémond Costa

    2013-04-01

    Full Text Available A maioria das fraturas dos ossos temporais resulta de traumas cranianos bruscos, de alta energia, estando muitas vezes relacionadas a outras fraturas cranianas ou a politraumatismo. As fraturas e os deslocamentos da cadeia ossicular, na orelha média, representam umas das principais complicações das injúrias nos ossos temporais e, por isso, serão abordadas de maneira mais profunda neste artigo. Os outros tipos de injúrias englobam as fraturas labirínticas, fístula dural, paralisia facial e extensão da linha de fratura ao canal carotídeo. A tomografia computadorizada tem papel fundamental na avaliação inicial dos pacientes politraumatizados, pois é capaz de identificar injúrias em importantes estruturas que podem causar graves complicações, como perda auditiva de condução ou neurossensorial, tonturas e disfunções do equilíbrio, fístulas perilinfáticas, paralisia do nervo facial, lesões vasculares, entre outras.Most temporal bone fractures result from high-energy blunt head trauma, and are frequently related to other skull fractures or to polytrauma. Fractures and displacements of ossicular chain in the middle ear represent some of the main complications of temporal bone injury, and hence they will be more deeply approached in the present article. Other types of injuries include labyrinthine fractures, dural fistula, facial nerve paralysis and extension into the carotid canal. Computed tomography plays a fundamental role in the initial evaluation of polytrauma patients, as it can help to identify important structural injuries that may lead to severe complications such as sensorineural hearing loss, conductive hearing loss, dizziness and balance dysfunction, perilymphatic fistulas, facial nerve paralysis, vascular injury and others.

  16. Características da demanda por tomografia computadorizada crânio-encefálica motivos e custos dos exames

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    Ana Tereza Ramos de Oliveira

    1992-03-01

    Full Text Available Foram levantadas as 2860 tomografias computadorizadas crânio-encefálicas (TCCE feitas em um dos três serviços da cidade do Salvador, Brasil, sendo: caracterizados o perfil do usuário e a procedência da demanda; analisados os motivos dos exames e os custos com TCCE normais e anormais. Foram constatadas frequências altas de exames normais: (a para o sexo feminino (66,0% e até os 54 anos (73,0%, neste sexo (variação de exames normais entre 65 e 80%; (b para o sexo masculino nos grupos <15, 25-34 e 35-44 anos (64,7%; (c para solicitações efetuadas pelos convênios (65,3%; (d pelos seguintes motivos, para homens e mulheres respectivamente: cefaléias (81,3 e 87,5%; desmaios/tonturas (79,3 e 78,6%; convulsões (67,3 e 70%; retardo do desenvolvimento psicomotor (72,0 e 67,7%; «distúrbios endócrinos» (75,0% em cada sexo. Proporções altas de exames anormais foram observadas pelos seguintes motivos e para homens e mulheres, respectivamente: síndrome demencial (91,7 e 83,3%; acidentes vasculares encefálicos (85,1 e 73,7%; doenças infecciosas (76,5 e 78,6%; suspeitas de tumor (65,8 e 55,4%; e traumatismo crâ-nioencefálico, 63,6% no sexo masculino. No total, os custos com as TCC normais corresponderam a US$ 565,255 e com as anormais, US$ 381,247; para os convênios, os custos com TCC normais foram 2,2 vezes superiores ao INAMPS e 2,8 vezes superiores àqueles da medicina privada.

  17. Colonografia por tomografia computadorizada na visão do médico encaminhador: qual o seu valor segundo a visão de especialistas?

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    Marcelo Longo Kierszenbaum

    2014-06-01

    Full Text Available Objetivo: Mapear a visão dos cirurgiões sobre o papel da colonografia por tomografia computadorizada (CTC. Materiais e Métodos: Envio de questionário eletrônico aos membros do Colégio Brasileiro de Cirurgiões. O questionário constou de 16 questões de múltipla escolha que abordaram dados demográficos e conhecimentos gerais sobre a CTC. Resultados: Foram obtidas 144 respostas; 90,3% dos especialistas eram homens, 60% com menos de 30 anos de formado, 77,1% eram gastrocirurgiões, 22,9% eram cirurgiões gerais, 53,5% encontravam-se na vida acadêmica e 59,7% exerciam sua atividade profissional em cidades com mais de 500.000 habitantes. Em relação ao conhecimento da CTC, 84,7% conheciam o método, 70,8% sabiam como é realizado, 56,9% relataram conhecer o preparo intestinal utilizado, 31,3% utilizavam o método e 53,5% conheciam algum serviço de CTC na cidade em que atuam. Cerca de metade dos profissionais não conhecia a precisa indicação do método. Profissionais que atuam em cidades com mais de 500.000 habitantes conhecem e utilizam mais o método (p < 0,005. Houve uma tendência de os profissionais com carreira acadêmica utilizarem mais o método. Conclusão: A CTC, embora ainda pouco utilizada em nosso meio, é bastante conhecida, principalmente em grandes centros urbanos e no ambiente acadêmico.

  18. Estudo radiográfico e por tomografia computadorizada das formações orais em cães

    OpenAIRE

    Carolina de Oliveira Ghirelli

    2008-01-01

    As neoplasias orais representam a quarta neoplasia mais comum em cães. O diagnóstico por imagem das neoplasias orais é necessário para determinar a extensão do tumor e dos tecidos locais acometidos, auxiliando no prognóstico e planejamento cirúrgico. Atualmente o exame radiográfico é o método diagnóstico mais utilizado por ser mais acessível e menos oneroso, porém o grande número de estruturas no crânio e suas sobreposições dificultam adequada avaliação desta região. A tomografia computadoriz...

  19. Tomografia computadorizada como método auxiliar no diagnóstico e tratamento de lesões intra-ósseas: caso clínico de odontoma composto = Computed tomography as auxiliary method in the diagnostic and treatment of intra-osseos lesions: a case of compound odontoma

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    Paiano, Grasiela Antunes

    2006-01-01

    Full Text Available O advento da tomografia computadorizada (TC possibilita de visualização tridimensional, favorece o diagnóstico e proporcionando um tratamento mais preciso em virtude da localização exata da lesão e análise da proximidade com as estruturas anatômicas vitais relacionadas. Contudo o tratamento de lesões ósseas se torna mais segura, reduzindo o risco de lesão a dentes adjacentes e nervos. O Odontoma é considerado o tumor odontogênico que mais comumente acomete os ossos maxilares. A variante composta deste tumor apresenta a característica de muitas estruturas semelhantes a dentes envolvidas por um halo radiolúcido e grande freqüência na região anterior da maxila, porém o diagnóstico deste tumor nas demais localizações dos maxilares é pouco freqüente. Apresenta normalmente crescimento limitado e expande as corticais ósseas, porém sem tendência à recidiva. O tratamento do odontoma consiste na sua excisão cirúrgica. Os autores pretendem relatar a utilização da TC como método auxiliar no diagnóstico e tratamento de um caso de exérese de um odontoma composto na região anterior da mandíbula

  20. Carcinoma espinocelular do conduto auditivo externo: estudo por tomografia computadorizada de seis casos Squamous cell carcinoma of the external auditory canal: computed tomography findings in six cases

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    Fábio Mota Gonzalez

    2005-06-01

    Full Text Available OBJETIVO: Analisar a importância da avaliação tomográfica da extensão profunda dos carcinomas espinocelulares do conduto auditivo externo. MATERIAIS E MÉTODOS: Foram realizados exames tomográficos com cortes axiais e coronais com janelas para partes moles e óssea em seis pacientes com carcinoma espinocelular do conduto auditivo externo, com idade variando entre 55 e 71 anos, internados no Hospital Heliópolis, no período entre maio de 1995 e dezembro de 2003. RESULTADOS: Dos seis pacientes, todos apresentavam aumento de partes moles no conduto auditivo externo, cinco (83,3% tinham erosão óssea e invasão da orelha média, quatro (66,7% possuíam comprometimento da mastóide e da glândula parótida, três (50% apresentavam invasão da articulação temporomandibular, dois (33,3% tinham invasão da fossa média, do canal carotídeo e linfonodomegalia júgulo-carotídea alta ipisilateral. CONCLUSÃO: A avaliação da extensão tumoral profunda fornecida pela tomografia computadorizada é importante no estadiamento clínico, possibilitando um planejamento terapêutico mais eficaz.OBJECTIVE: To evaluate the role of computed tomography in the assessment of deep extension of squamous cell carcinoma of the external auditory canal. MATERIALS AND METHODS: In the period between May 1995 and December 2003 six patients with squamous cell carcinoma of the external auditory canal were submitted to computed tomography scan at "Hospital Heliópolis", São Paulo, SP, Brazil, including axial and coronal slices with soft tissue and bone algorithms. RESULTS: Thickening of the soft tissue of the external auditory canal was seen in all patients, bone erosion and invasion of the middle ear in five (83.3%, invasion of the mastoid and parotid gland in four (66.7%, invasion of the temporomandibular joint in three (50%, and invasion of the middle cranial fossa, carotid canal and cervical lymph node enlargement in two (33.3% patients. CONCLUSION: Assessment of

  1. A tomografia computadorizada de alta resolução na avaliação da toxicidade pulmonar por amiodarona High-resolution computed tomography of amiodarone pulmonary toxicity

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    Daniela Peixoto Consídera

    2006-04-01

    Full Text Available OBJETIVO: Avaliar as principais alterações identificadas na tomografia computadorizada de alta resolução do tórax em pacientes com toxicidade pulmonar pela amiodarona. MATERIAIS E MÉTODOS: Foram avaliadas dez tomografias computadorizadas de alta resolução de tórax de pacientes com pneumonite pela amiodarona, seis desses pacientes do sexo masculino e quatro do sexo feminino, com idade média de 73,5 anos. RESULTADOS: Os achados tomográficos mais relevantes foram opacidades lineares ou reticulares em seis casos (60%, pequenos nódulos com densidade elevada em seis casos (60%, consolidações densas em três casos (30% e aumento da densidade do parênquima hepático em cinco de oito casos em que havia estudo tomográfico do abdome superior (62,5%. CONCLUSÃO: A tomografia computadorizada de alta resolução é um exame importante na avaliação de pacientes com toxicidade pulmonar pela amiodarona, devendo ser realizada sempre que houver suspeita deste diagnóstico. O achado de espessamento de septos interlobulares associado a lesões com aumento de densidade é altamente sugestivo deste diagnóstico.OBJECTIVE: To evaluate the main findings of chest high-resolution computed tomography in patients with amiodarone pulmonary toxicity. MATERIALS AND METHODS: Ten patients - six male and four female, average age of 73.5 years - with amiodarone-induced pneumonitis have undergone chest high-resolution computed tomography. RESULTS: The most relevant tomographic findings were linear or reticular opacities in six cases (60%, small high density nodules in six cases (60%, dense consolidations in three cases (30% and increased density in the hepatic parenchyma in five of eight cases in which there was a superior abdomen CT scan (62.5%. CONCLUSION: The high-resolution computed tomography is a valuable non-invasive test for evaluating patients with amiodarone pulmonary toxicity and should always be performed when one suspects of the presence of this

  2. Computed tomography scan of the head in patients with migraine or tension-type headache Tomografia computadorizada do crânio em pacientes com migrânea ou cefaléia tensional

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    Marcelo Moraes Valença

    2002-09-01

    Full Text Available A retrospective study was performed in order to evaluate the frequency of abnormalities found by computed tomography (CT scan of the head in 78 patients with migraine or tension-type headache. In the present study CT scan was normal in 61.5% of the patients with migraine or tension-type headache. A number of abnormalities were encountered in more than one third of the patients studied, including inflammatory sinus disease (19.2%, cysticercosis (3.9%, unruptuted cerebral aneurysm (2.6%, basilar impression (2.6%, intracranial lipoma (2.6%, arachnoid cyst (2.6%, empty sella (2.6%, intracranial neoplasm (2.6%, and others (2.6%. None of these lesions were symptomatic or responsible by the headache picture, therefore, considered incidental findings. In conclusion, the fortuitous encounter of some abnormalities on CT scan of the head is often higher than what we could predict in patients suffering migraine or tension-type headache. We briefly discuss clinical, epidemiologic, and practical management of some of the abnormalities detected by CT scan as well as the indication to request a neuroimaging investigation.Um estudo retrospectivo foi realizado visando avaliar a frequência de anormalidades encontradas durante a realização de estudo por tomografia computadorizada (TC em 78 pacientes com migrânea ou cefaléia do tipo tensional. A TC foi normal em 61,5% dos pacientes examinados. Em um terço dos pacientes estudados foram detectadas anormalidades, como doença inflamatória dos seios paranasais (19,2%, cisticercose (3,9%, aneurisma cerebral não-roto (2,6%, impressão basilar (2,6%, lipoma intracraniano (2,6%, cisto aracnoideo (2,6%, sela vazia (2,6%, neoplasia intracraniana (2,6% e outras afecções (2,6%. Nenhuma destas lesões era sintomática (achado incidental. Concluindo, o encontro fortuito de algumas anormalidades na TC é frequentemente mais elevado do que se prediz em pacientes com cefaléia primária. Nós discutimos brevemente alguns

  3. Densidade de um planossolo sob sistemas de cultivo avaliada por meio da tomografia computadorizada de raios gama Bulk density of an alfisol under cultivation systems in a long-term experiment evaluated with gamma ray computed tomography

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    Adilson Luís Bamberg

    2009-10-01

    Full Text Available A sustentabilidade do arroz (Oryza sativa L. irrigado em solos de várzea está alicerçada na utilização da rotação e sucessão de culturas, fundamentais para o controle do arroz-vermelho e preto. Os reflexos sobre os atributos dos solos de várzea merecem estudos em especial sobre a compactação do solo. O objetivo deste trabalho foi identificar camadas compactadas em Planossolo submetido a diferentes sistemas de cultivo e preparo, avaliando-se a densidade do solo (Ds pela Tomografia Computadorizada de Raios Gama (TC. A análise foi realizada em um experimento de longa duração, conduzido de 1985 a 2004, na Estação Experimental da Embrapa Clima Temperado, Capão do Leão, RS, num delineamento experimental em blocos ao acaso, com sete tratamentos, cada um com quatro repetições (T1 - um ano de arroz com preparo convencional do solo seguido de dois anos de pousio; T2 - cultivo contínuo de arroz com preparo convencional do solo; T4 - rotação de arroz e soja (Glycine max L. com preparo convencional do solo; T5 - rotação de arroz, soja e milho (Zea maiz L. em preparo convencional do solo; T6 - plantio direto de arroz no verão em sucessão do azevém (Lolium multiflorum L. no inverno; T7 - rotação de arroz sob plantio direto e soja sob preparo convencional do solo; T8 - testemunha: solo sem cultivo. A Tomografia Computadorizada de Raios Gama permitiu detectar que o plantio direto de arroz no verão em sucessão do azevém no inverno não resultou na formação de camadas compactadas; a utilização de dois anos de pousio, no sistema de produção de arroz irrigado, não foi suficiente para evitar a formação de uma camada superficial compactada; e a rotação de arroz, soja e milho com preparo convencional do solo apresentou duas camadas compactadas (0,0 a 1,5 cm e 11 a 14 cm, indicando que essas podem limitar a produção agrícola nesse sistema de produção em Planossolos.The sustainability of irrigated rice (Oryza sativa L. in

  4. Correlação entre hipótese diagnóstica e laudo de tomografia axial computadorizada craniana Correlation between diagnostic hypothesis and result of cranial computed axial tomography

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    Edison Matos Nóvak

    2001-09-01

    Full Text Available Para avaliar a utilização da tomografia axial computadorizada craniana (TC em nosso meio, analisamos as solicitações de 367 exames consecutivos no período compreendido entre 07/1995 e 07/1996. Houve ampla variação da faixa etária, com média de 31,7 ± 22,9 anos. As especialidades que mais solicitaram o exame foram: Neurologia (36,2%, Pronto Atendimento (17,4%, Neuropediatria (16,9% e Clínica Médica (5,9%. As indicações mais frequentes para o exame foram: convulsão (30%, cefaléia (26,2%, déficit motor (20,2% e redução do nível de consciência (16,9%. As "hipóteses" aventadas com maior frequência foram: afastar lesão estrutural (9,0%, acidente vascular não discriminado (8,2% e neurocisticercose (8,2%. O laudo da TC foi normal em 50,4% dos exames. Os laudos anormais mais frequentes foram: hidrocefalia (5,4%, acidente vascular isquêmico (5,4% e neoplasia (3,5%. As maiores taxas de achados normais foram encontradas nas "hipóteses" de cefaléia (94,4%, convulsão (71,4% e afastar lesão estrutural (66,7%. Os maiores índices de acerto entre hipótese e laudo foram encontrados nas situações de "afastar lesões estruturais" (66,7%, hidrocefalia (50%, acidente vascular cerebral isquêmico (50% e hematoma (50%. Concluimos que a utilização de um recurso auxiliar de diagnóstico como a TC cumpre melhor ainda a sua função se o requisitante do exame preencher com clareza e detalhamento o pedido do exame.The use of computed axial tomography (CT in the investigation of neurologic disorders is attractive for his disponibility in the health services. However, the indications of the exam and the correlation with the clinical features has not been frequently studied. We study correlation between the requests of CT and the findings reported by the radiologist, in 367 exams performed from 07/1995 to 07/ 1996. The mean age was 31.7 ± 22.9 years. The CT were requested in decrescent order of frequency by the Services of Neurology (36

  5. Achados de tomografia computadorizada de alta resolução em pneumonia pelo vírus parainfluenza pós-transplante de medula óssea: relato de caso

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    Emerson L. Gasparetto

    2004-11-01

    Full Text Available RESUMO: Paciente feminina, de 19 anos, transplantada de medula óssea devido a leucemia mielóide crónica, apresentando tosse seca e coriza no 67.º dia após o procedimento. A radiografia de tórax não evidenciou alterações. A tomografia computadorizada de alta resolução do tórax revelou consolidação subsegmentar na periferia do lobo inferior esquerdo e áreas de redução da atenuação nos terços superior e médio dos pulmões. O lavado broncoalveolar demonstrou pesquisa positiva por imunoflorescência direta para anticorpos anti-vírus parainfluenza. Foi instituído tratamento com ribavirina aerolizada durante 10 dias, havendo melhoria clínico-radiológica do quadro infeccioso.REV PORT PNEUMOL 2004; X (6: 485-489 ABSTRACT: Nineteen year-old female patient, who underwent bone marrow transplantation because of chronic myelogenous leukemia, presented with dry cough and coriza sixty-seven days after the procedure. The chest radiograph was normal. The high resolution computed tomography showed a subsegmental air-space consolidation at the periphery of the left inferior lobe and areas of low attenuation at the superior and middle lung zones. The bronchoalveolar lavage demonstrated positive direct fluorescence antibody testing against parainfluenza virus. Treatment with aerolizated ribavirin was instituted during 10 days and the patient showed clinical-radiological improvement.REV PORT PNEUMOL 2004; X (6: 485-489 Palavras-chave: Vírus parainfluenza, tomografia computadorizada de alta resolução, transplante de medula óssea, Key-words: Parainfluenza virus, high resolution computed tomography, bone marrow transplantation

  6. Development of a guidance guide for dosimetry in computed tomography; Desenvolvimento de um guia orientativo para dosimetria em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Fontes, Ladyjane Pereira

    2016-07-01

    Due to frequent questions from users of ionization chambers pencil type calibrated in the Instrument Calibration Laboratory of the Institute of Energy and Nuclear Research (LCI - IPEN), on how to properly apply the factors indicated in their calibration certificates, a guide was prepared guidance for dosimetry in computed tomography. The guide includes guidance prior knowledge of half value layer (HVL), as it is necessary to know the effective beam energy for application quality for correction factor (kq). The evaluation of HVL in TC scanners becomes a difficult task due to system geometry and therefore a survey was conducted of existing methodologies for the determination of HVL in clinical beams Computed Tomography, taking into account technical, practical and economic factors. In this work it was decided to test a Tandem System consists of absorbing covers made in the workshop of IPEN, based on preliminary studies due to low cost and good response. The Tandem system consists of five cylindrical absorbing layers of 1mm, 3mm, 5mm, 7mm and 10mm aluminum and 3 cylindrical absorbing covers 15mm, 25mm and acrylic 35mm (PMMA) coupled to the ionization chamber of commercial pencil type widely used in quality control tests in dosimetry in clinical beams Computed tomography. Through Tandem curves it was possible to assess HVL values and from the standard curve pencil-type ionization chamber, Kq find the appropriate beam. The elaborate Guide provides information on how to build the calibration curve on the basis of CSR, to find the Kq and information for construction Tandem curve, to find values close to CSR. (author)

  7. Avaliação da expansão rápida da maxila por meio da tomografia computadorizada: relato de um caso Computed tomography evaluation of rapid maxillary expansion: a case report

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    Daniela Gamba Garib

    2005-08-01

    Full Text Available Este trabalho descreve os efeitos dentoesqueléticos e periodontais da expansão rápida da maxila (ERM, avaliados por meio da tomografia computadorizada (TC, em uma jovem de 11,6 anos de idade com má oclusão de Classe I e mordida cruzada posterior unilateral funcional. Durante a fase ativa da ERM, o expansor dentossuportado com parafuso Hyrax foi ativado 7mm. A paciente submeteu-se ao exame de TC helicoidal, antes da expansão e após a remoção do aparelho expansor, findo o período de três meses de contenção. Realizaram-se cortes axiais, de um milímetro de espessura, paralelamente ao plano palatino, englobando as regiões dentoalveolar e basal da maxila, até o terço inferior da cavidade nasal. Utilizando-se o recurso de reconstruções multiplanares, mensuraram-se pelo método computadorizado: as dimensões transversas maxilares, a inclinação dos dentes posteriores, a espessura das tábuas ósseas vestibular e lingual, e o nível da crista óssea alveolar vestibular. A expansão rápida da maaxila ocasionou um significante aumento transverso em todas as regiões aferidas, com magnitude decrescente do arco dentário para a base óssea. Os dentes posteriores foram movimentados para vestibular, com um componente de inclinação e translação associados. Tal efeito ortodôntico ocasionou uma redução na espessura da tábua óssea vestibular, e um concomitante aumento na espessura da tábua óssea lingual. Após a expansão, observou-se o desenvolvimento de deiscências ósseas por vestibular dos dentes de ancoragem.This paper presents a computed tomography (CT evaluation of rapid maxillary expansion dentoskeletal and periodontal effects, in a 11.6 year-old girl presenting Class I malocclusion with posterior unilateral crossbite. The tooth-borne expander with Hyrax screw was activated 7-mm. The patient was submitted to helicoidal CT scan before expansion and after the three-month retention period when the expander was removed. Axial

  8. Análise por tomografia computadorizada do enxerto autógeno na cirurgia de "sinus lift" Computed tomography evaluation of autogenous graft in sinus lift surgery

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    Sérgio Aron Ajzen

    2005-02-01

    Full Text Available OBJETIVO: Quantificar a formação óssea nos enxertos com e sem plasma rico em plaquetas, obtido pelos métodos de centrifugação e aférese, comparando os três tipos de enxertos realizados por meio de análise tomográfica. MATERIAIS E MÉTODOS: Este estudo prospectivo, duplo cego, utilizou uma amostra composta de 34 pacientes adultos, de ambos os sexos, com idade média de 48 anos e 8 meses, portadores de pneumatização unilateral ou bilateral dos seios maxilares, que necessitavam de enxertos ósseos, com a finalidade de melhorar as condições locais para a colocação dos implantes dentários. Todos os pacientes realizaram tomografia computadorizada antes da cirurgia. Foram operados 53 seios maxilares, divididos em três grupos: enxerto de plasma rico em plaquetas obtido pelos métodos de aférese, centrifugação e enxerto apenas de osso autógeno. Após seis meses do procedimento cirúrgico foram realizados novos exames de imagem. RESULTADOS: Pela avaliação tomográfica, houve crescimento em altura e em largura nos três grupos quando foram comparados os momentos inicial e final, entretanto, não houve diferença estatística para a altura e para a largura. CONCLUSÃO: Evidências clínicas demonstram a eficácia dos enxertos autógenos, principalmente os associados a fatores indutores de crescimento ósseo, como o plasma rico em plaquetas, recuperando o arcabouço maxilofacial, necessário para a reconstrução protética e funcional por meio de implantes dentários.OBJECTIVE: To quantify bone formation within autogenous bone grafts and autogenous bone grafts in combination with platelet-rich plasma obtained either from aphaeresis or centrifugation using computed tomography. MATERIALS AND METHODS: This prospective, double-blind study was conducted in 34 male and female adult patients (mean age of 28 years and 8 months, with either unilateral or bilateral pneumatization of the maxillary sinuses, requiring bone graft for dental

  9. Validation of computed tomography protocols for simulated mandibular lesions: a comparison study Validação de protocolos de tomografia computadorizada para lesões simuladas em mandíbula: estudo comparativo

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    Andréia Perrella

    2007-06-01

    Full Text Available Computed tomography is the choice technique to assess oral and maxillofacial osseous lesions because it provides hard and soft tissues visualization in one examination without superimposition of surrounding structures. This examination offers a significant advance in maxillofacial lesions detection with an excellent anatomic resolution. The aim of this research was to evaluate the validity of two protocols, in axial sections, in simulated mandibular lesions. Two CT protocols were obtained in dry mandibles in which perforations were done simulating lesions. Two observers, previously calibrated, evaluated the images according to different parameters. The results indicated that the sensitivity and specificity in lesion detection were 100% for both protocols, but the detection of loci number of multilocular lesions and the location and detection of medullar invasion obtained reduced validity values, which were influenced by the acquisition protocol. We concluded that thinner axial slices and reconstructions were more effective in detecting early medullar invasion and loci number. Thicker protocols were not considered appropriate to detect multilocular lesions and early stages of medullar invasion.A tomografia Computadorizada é a técnica de escolha no exame de lesões ósseas orais e maxilo-faciais porque proporciona a visualização de tecidos duros e moles em aquisição única e sem sobreposição de estruturas adjacentes. Este exame oferece um avanço significativo na detecção de lesões maxilo-faciais, com excelente resolução anatômica. O objetivo desta pesquisa foi avaliar a validade de dois protocolos, em secções axiais, em lesões simuladas de mandíbula. Dois protocolos de TC foram obtidos em mandíbulas secas em que foram feitas perfurações, simulando lesões. Dois observadores previamente calibrados avaliaram as imagens seguindo parâmetros diversos. Como resultados pudemos observar que a sensibilidade e a especificidade foram

  10. Proposta para padronização do relatório de tomografia computadorizada nos aneurismas da aorta abdominal A proposal for standardizing computed tomography reports on abdominal aortic aneurysms

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    Fabiola Goda Torlai

    2006-08-01

    Full Text Available OBJETIVO: Propor um modelo de padronização de relatório para aneurisma da aorta abdominal na tomografia computadorizada. MATERIAIS E MÉTODOS: Foram realizadas, no período de abril a outubro de 2004, entrevistas com integrantes da Disciplina de Cirurgia Vascular da nossa instituição, para elaboração de um modelo de padronização de relatório de tomografia computadorizada para o estudo do aneurisma da aorta abdominal. A partir deste modelo foi elaborado um questionário, enviado a nove outros cirurgiões, todos com experiência em cirurgia da aorta abdominal. O índice de resposta aos questionários foi de 55,5% (5/9. RESULTADOS: Os parâmetros de interesse citados mais freqüentemente para a avaliação dos aneurismas de aorta abdominal foram: diâmetro máximo do colo proximal, extensão do colo proximal até a artéria renal mais baixa, forma do colo proximal, diâmetro máximo do aneurisma e diâmetro das artérias ilíacas comuns. Estes dados permitiram elaborar uma proposta de modelo para padronização de relatório na tomografia computadorizada. CONCLUSÃO: Um modelo para a análise tomográfica padronizada do aneurisma de aorta abdominal permite atender às necessidades dos cirurgiões vasculares para acompanhar a evolução e planejar o tratamento destes pacientes.OBJECTIVE: To propose a model to standardize computed tomography reports on abdominal aortic aneurysms. MATERIALS AND METHODS: Interviews were carried out with members of Vascular Surgery Division of our institution, in the period between April and October 2004, aiming at developing a standardized model of computed tomography reports on abdominal aortic aneurysms. Based on this model, a questionnaire was elaborated and sent to other nine surgeons, all of them experienced in the field of abdominal aortic surgery. The questionnaires response rate was 55.5% (5/9. RESULTS: The most frequently mentioned parameters of interest for evaluation of abdominal aortic aneurysms

  11. Fibrose maciça progressiva em trabalhadores expostos à sílica: achados na tomografia computadorizada de alta resolução Progressive massive fibrosis in silica-exposed workers: high-resolution computed tomography findings

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    Ângela Santos Ferreira

    2006-12-01

    Full Text Available OBJETIVO: Avaliar as características radiológicas das massas conglomeradas pela tomografia computadorizada de alta resolução de tórax. MÉTODOS: Foram selecionados 75 pacientes silicóticos, a maioria jateadores de areia, portadores de fibrose maciça progressiva, atendidos no Hospital Universitário Antônio Pedro entre 1986 e 2004. Os pacientes foram submetidos a avaliação clínica, radiografia simples de tórax e tomografia computadorizada de alta resolução. RESULTADOS: Mais da metade dos pacientes com silicose complicada mostrou na radiografia de tórax grandes opacidades dos tipos B e C, denotando a gravidade da doença nesses pacientes. Dos 75 casos, apenas um apresentou massa unilateral simulando câncer de pulmão. Quarenta e quatro pacientes realizaram tomografia computadorizada de alta resolução do tórax. As massas predominaram nos terços superiores e posteriores (88,6%. Broncograma aéreo e calcificações no interior das massas foram observados em 70,4% e 63,8% dos casos, respectivamente. História de tuberculose foi relatada em 52% dos pacientes estudados. CONCLUSÃO: Na grande maioria dos casos as massas eram bilaterais, predominando nas regiões póstero-superiores dos pulmões, com broncogramas aéreos e calcificações de permeio. Associação com calcificações linfonodais foi um achado freqüente. A exposição a elevadas concentrações de poeira e a tuberculose foram consideradas fatores de risco para o desenvolvimento da fibrose maciça progressiva.OBJECTIVE: To evaluate the radiological characteristics of conglomerate masses using high-resolution computed tomography of the chest. METHODS: From among the patients treated between 1986 and 2004 at the Antonio Pedro University Hospital, 75 patients with silicosis and massive fibrosis, most working in the field of sandblasting, were selected for study. These patients were submitted to a clinical evaluation, chest X-ray and high-resolution computed tomography of

  12. Análise de carcinomas epidermóides por meio de radiografia panorâmica e tomografia computadorizada Analysis of squamous cell carcinomas by means of panoramic radiography and computed tomography

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    Amanda Cáceres PEREIRA

    2001-12-01

    Full Text Available Este trabalho teve como objetivo correlacionar aspectos radiográficos como, localização e extensão do tumor, infiltração óssea e de tecidos moles e destruição das corticais, obtidos nas radiografias panorâmicas com os encontrados nas tomografias computadorizadas (TCs. Os aspectos radiográficos de 48 pacientes com diagnóstico histopatológico de carcinomas epidermóides, localizados em várias regiões do complexo buco-maxilo-facial, foram analisados por 4 radiologistas. As radiografias panorâmicas e as tomografias computadorizadas foram realizadas nos hospitais e clínicas da Universidade de Iowa (EUA, FUNDECTO - USP e Hospital Universitário da Universidade de São Paulo (SP, Brasil. Como resultados, obtivemos a grande limitação da radiografia panorâmica em determinar a localização e extensão do tumor, com delimitações bastante imprecisas da lesão. Já as TCs ofereceram resultados mais direcionados como: invasão do tumor em direção a estruturas moles adjacentes, extensão da destruição óssea, bem como a profundidade da lesão, que foram confirmados com os achados cirúrgicos. Concluímos que a tomografia computadorizada demonstrou ser uma técnica bastante sensível na detecção do comprometimento ósseo e do envolvimento de tecidos moles, proporcionando, assim, o auxílio no diagnóstico e no planejamento do tratamento. No entanto, a radiografia panorâmica foi muito pouco sensível e eficaz, por mostrar apenas margens imprecisas e pouco nítidas da lesão, não avaliando o envolvimento de tecidos moles.The purpose of this work was to compare radiographic findings, such as localization and extension of tumors toward the bone and soft tissues, in panoramic radiography and computed tomography (CT. Four radiologists assessed the radiographic findings of 48 patients with the histopathological diagnosis of squamous cell carcinoma in different sites of the maxillofacial region. Panoramic radiographs and computed

  13. Comparação morfométrica da orelha interna entre ovinos e humanos através da tomografia computadorizada CT-Scan sheep and human inner ear morphometric comparison

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    Valter Ayres Seibel

    2006-06-01

    Full Text Available INTRODUÇÃO: trabalhos sobre o uso de ovelhas em cirurgias experimentais e treinamento em cirurgia otológica são raros. Este estudo pretende contribuir para ampliar o conhecimento nessa área. OBJETIVO: Estudar a orelha interna da ovelha por meio de tomografia computadorizada e cortes sucessivos com o intuito de apresentar dados morfométricos mais precisos relacionados à comparação entre a orelha de ovelhas e a de humanos. MATERIAL E MÉTODO: Foi realizado um estudo descritivo sem seguimento no qual foram comparadas as estruturas da orelha interna da ovelha com as dos humanos. As medidas foram obtidas através de tomografias computadorizadas e avaliadas por meio de um programa de análise de imagens médicas (Osíris 4.16. RESULTADOS: O estudo morfológico da orelha da ovelha, em média, e da orelha humana, em média, revelaram grande similaridade de anatomia. A maior parte das estruturas (10 de 15 preservou a relação proposta de 2/3 da dimensão humana em relação à dimensão ovina. CONCLUSÃO: Os achados contribuem para uso da orelha da ovelha como modelo em cirurgia experimental e treinamento em cirurgia otológica.INTRODUCTION: Studies about the use of sheep in surgical training and experimental otologic surgery are rare. This study intends to contribute to the knowledge on this field. AIM: To study sheep inner ear structures using computerized tomography and serial cross-sections to collect more accurate morphometric data to compare sheep and human ears. MATERIAL AND METHODS: This descriptive study compared the inner structures of sheep and human ears. Measurements were made using computerized tomography, and they were stored in a DICOM compact disc for later analysis and manipulation, with a program used for medical image analysis (Osíris 4.16. RESULTS: Mean measures for sheep and human ears were found to be similar in this morphological study. Most structures (10 out of 15 maintained the 2/3 ratio of sheep to human ear

  14. Quando a fase de equilíbrio pode ser suprimida nos exames de tomografia computadorizada de abdome? What is the real role of the equilibrium phase in abdominal computed tomography?

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    Priscila Silveira Salvadori

    2013-04-01

    Full Text Available OBJETIVO: Avaliar a necessidade de realização da fase de equilíbrio nos exames de tomografia computadorizada de abdome. MATERIAIS E MÉTODOS: Realizou-se estudo retrospectivo, transversal e observacional, avaliando 219 exames consecutivos de tomografia computadorizada de abdome com contraste intravenoso, realizados num período de três meses, com diversas indicações clínicas. Para cada exame foram emitidos dois pareceres, um avaliando o exame sem a fase de equilíbrio (primeira análise e o outro avaliando todas as fases em conjunto (segunda análise. Ao final de cada avaliação, foi estabelecido se houve mudança nos diagnósticos principais e secundários, entre a primeira e a segunda análise. Foi utilizada a extensão do teste exato de Fisher para avaliar a modificação dos diagnósticos principais (p 0,999. Com relação aos diagnósticos secundários, cinco exames (2,3% foram modificados. CONCLUSÃO: Para indicações clínicas como estadiamento tumoral, abdome agudo e pesquisa de coleção abdominal, a fase de equilíbrio não acrescenta contribuição diagnóstica expressiva, podendo ser suprimida dos protocolos de exame.OBJECTIVE: To evaluate the role of the equilibrium phase in abdominal computed tomography. MATERIALS AND METHODS: A retrospective, cross-sectional, observational study reviewed 219 consecutive contrast-enhanced abdominal computed tomography images acquired in a three-month period, for different clinical indications. For each study, two reports were issued - one based on the initial analysis of non-contrast-enhanced, arterial and portal phases only (first analysis, and a second reading of these phases added to the equilibrium phase (second analysis. At the end of both readings, differences between primary and secondary diagnoses were pointed out and recorded, in order to measure the impact of suppressing the equilibrium phase on the clinical outcome for each of the patients. The extension of the exact Fisher

  15. Microlitíase alveolar pulmonar: achados na tomografia computadorizada de alta resolução do tórax em 10 pacientes Pulmonary alveolar microlithiasis: high-resolution computed tomography findings in 10 patients

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    Edson Marchiori

    2007-10-01

    Full Text Available OBJETIVO: Apresentar os achados na tomografia computadorizada de alta resolução (TCAR do tórax da microlitíase alveolar pulmonar. MÉTODOS: Foram estudadas, retrospectivamente, as tomografias de dez pacientes adultos, sete mulheres e três homens, com idade média de 38,7 anos. Os exames foram analisados por dois radiologistas, de forma independente, e as decisões finais foram obtidas por consenso. RESULTADOS: Os achados mais freqüentes foram as opacidades em vidro fosco e as calcificações subpleurais, ambas presentes em 90% dos pacientes estudados. Os outros achados de maior relevância foram pequenos nódulos parenquimatosos, calcificação ao longo dos septos interlobulares, cissuras nodulares, nódulos subpleurais, cistos subpleurais, consolidações densas e padrão de pavimentação em mosaico. CONCLUSÕES: A microlitíase alveolar pulmonar apresenta aspectos na TCAR que são altamente sugestivos da doença, na maior parte dos casos dispensando a realização de biópsias pulmonares.OBJECTIVE: To present the high-resolution computed tomography (HRCT findings of pulmonary alveolar microlithiasis. METHODS: The HRCT scans of 10 adult patients (seven females and three males; mean age, 38.7 years were retrospectively analyzed. The films were studied independently by two radiologists. RESULTS: The most common tomographic findings were ground-glass attenuation and linear subpleural calcifications, which were seen in 90% of the patients. Other relevant findings were small parenchymal nodules, calcification along the interlobular septa, nodular cissures, subpleural nodules, subpleural cysts, dense consolidations, and a mosaic pattern of attenuation. CONCLUSIONS: The HRCT findings presented by individuals with pulmonary alveolar microlithiasis are distinct. In most cases, such findings can form the basis of the diagnosis, eliminating the need to perform a lung biopsy.

  16. Detection of beetle damage in forests by X-ray CT image processing Detecção de danos causados por besouro em florestas com processamento de imagens de tomografia computadorizada de raios X

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    Paulo Estevão Cruvinel

    2003-10-01

    Full Text Available Some beetle species can have devastating economic impacts on forest and nursery industries. A recent example is Anophophora glabripennis, a species of beetle known in the United States as the ''Asian Longhorrned beetle'', which has damaged many American forests, and is a threat which can unintentionally reach south American countries, including Brazil. This work presents a new method based on X-ray computerized tomography (CT and image processing for beetle injury detection in forests. Its results show a set of images with correct identification of the location of beetles in living trees as well as damage evaluation with time.Algumas espécies de besouros têm elevado impacto econômico em florestas e indústrias de móveis. Exemplo recente é aquele produzido pelo besouro Anophophora glabripennis, uma espécie conhecida nos Estados Unidos como Asian Longhorn, que tem produzido danos significativos em várias florestas americanas, representando uma ameaça que poderá encontrar transporte não-intencional para países da América do Sul, inclusive para o Brasil. Neste trabalho é apresentado um novo método com base no uso de tomografia de raios X computadorizada (CT e processamento de imagens digitais para detecção de injúrias causadas por besouros em florestas. Os resultados mostram a correta identificação da localização de besouros em árvores vivas, como também fornecem uma avaliação do estrago temporal causado.

  17. Anatomic considerations for C2 pedicle screw placement: the use of computerized tomography measurements Consideraciones anatómicas de la cocalización de los tornillos pediculares en C2: uitlización de las medidas de la tomografia computadorizada Considerações anatômicas sobre a localização dos parafusos pediculares em C2: utilização das medidas da tomografia computadorizada

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    Adebukoa Onibokun

    2009-03-01

    eje del pedículo y el ángulo transverso del pedículo (ángulo entre el eje del pedículo y la línea media del cuerpo vertebral. RESULTADOS: el valor promedio del ancho pedicular fue de 5.8 1.2mm. En el sexo masculino el valor promedio del ancho del pedículo (6.0 1.3mm fue mayor comparado con el sexo femenino (5.6 1.1mm, sin embargo no fue observada una diferencia estadística. El valor promedio del ángulo transverso del pedículo fue de 43.9 3.9 grados, siendo de 43.2 3.8 grados en el sexo masculino y 44.7 3.7 grados en el sexo femenino. CONCLUSIÓN: la proyección y determinación en el periodo preoperatorio de las dimensiones anatómicas del pedículo C2 son importantes para la determinación de la trayectoria y dimensiones del local donde el implante será colocado.OBJETIVO: o conhecimento detalhado das características anatômicas do pedículo de C2 é necessário para minimizar os riscos relacionados com a colocação dos parafusos. O objetivo deste trabalho é avaliar as medidas lineares e angulares do eixo axial verdadeiro do pedículo de C2 utilizando tomografia computadorizada. MÉTODOS: foram utilizadas tomografias computadorizadas axiais de 93 pacientes (47 do sexo masculino e 46 do sexo feminino com média de idade de 48 anos. As imagens axiais do pedículo de C2 foram selecionadas para o estudo e os parâmetros estudados foram: largura do pedículo (diâmetro mediolateral do istmo do pedículo perpendicular ao eixo do pedículo e o ângulo tranverso do pedículo (ângulo entre o eixo do pedículo e a linha média do corpo vertebral. RESULTADOS: o valor médio da largura do pedículo foi 5,81,2mm. Nos pacientes de sexo masculino o valor médio da largura do pedículo (6,01,3mm foi maior que nos pacientes de sexo feminino (5,61,1mm. No entanto, não foi observada diferença estatística. O valor médio do ângulo transverso do pedículo foi de 43,93,9 graus, sendo de 43,23,8 graus no sexo masculino e 44,73,7 graus no sexo feminino. CONCLUSÃO: o

  18. Complicações pulmonares após uso de crack: achados na tomografia computadorizada de alta resolução do tórax Pulmonary complications of crack cocaine use: high-resolution computed tomography of the chest

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    Alexandre Mançano

    2008-05-01

    Full Text Available Relatamos os achados na tomografia computadorizada de alta resolução de um paciente que, após uso de cocaína fumada (crack, desenvolveu quadro de hemoptise, dispnéia e dor torácica súbitas. As radiografias de tórax mostravam consolidações predominando em lobos superiores. A tomografia de alta resolução evidenciava opacidades em vidro fosco, consolidações e nódulos do espaço aéreo. Nova tomografia de controle, após suspensão da droga e uso de corticóides, mostrou regressão parcial das lesões e aparecimento de escavações. A correlação entre os achados clínicos, laboratoriais e de imagem permitiu o diagnóstico de "pulmão de crack".Here, we report high-resolution computed tomography (HRCT findings in a patient who developed sudden hemoptysis, dyspnea and chest pain after smoking crack cocaine. Chest X-rays showed consolidations, primarily in the upper lobes, and HRCT scans showed ground glass attenuation opacities, consolidations and air-space nodules. A follow-up CT, after drug use discontinuation and administration of corticosteroids, showed partial resolution of pulmonary lesions and the appearance of cavitations. Clinical, imaging and laboratory findings led to a diagnosis of 'crack lung'.

  19. New molecular targets for PET and SPECT imaging in neurodegenerative diseases Novos alvos moleculares para tomografia por emissão de pósitrons (PET e tomografia computadorizada por emissão de fóton único (SPECT em doenças neurodegenerativas

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    Marcel Benadiba

    2012-10-01

    Full Text Available The pathophysiology of neurodegenerative diseases (ND such as Alzheimer's disease (AD and Parkinson's disease (PD has not yet been completely elucidated. However, in the past few years, there have been great knowledge advances about intra-and extracellular proteins that may display impaired function or expression in AD, PD and other ND, such as amyloid beta (Aβ, α-synuclein, tau protein and neuroinflammatory markers. Recent developments in the imaging techniques of positron emission tomography (PET and single photon emission computed tomography (SPECT now allow the non-invasive tracking of such molecular targets of known relevance to ND in vivo. This article summarizes recent findings of PET and SPECT studies using these novel methods, and discusses their potential role in the field of drug development for ND as well as future clinical applications in regard to differential diagnosis of ND and monitoring of disease progression.A fisiopatologia das doenças neurodegenerativas (DN, tais como a doença de Alzheimer (DA e a doença de Parkinson (DP, ainda não é completamente compreendida. No entanto, nos últimos anos, houve grandes avanços em termos do conhecimento sobre proteínas intra e extracelulares, tais como beta-amiloide (Aβ, α-sinucleína, proteína tau e marcadores neuroinflamatórios, que podem ter sua função ou expressão prejudicada na DA, DP ou em outras DN. Progressos recentes nas técnicas de tomografia por emissão de pósitrons (PET e tomografia computadorizada por emissão de fóton único (SPECT permitem hoje em dia a identificação não invasiva de tais alvos moleculares in vivo. Este artigo resume descobertas recentes de estudos de PET e SPECT cerebral usando esses alvos moleculares inovadores e discute o papel potencial dessas técnicas no campo do desenvolvimento de novos medicamentos para as DN, bem como futuras aplicações clínicas em relação ao diagnóstico diferencial e monitoramento da progressão dessas

  20. Central nervous system abnormalities on midline facial defects with hypertelorism detected by magnetic resonance image and computed tomography Anomalias de sistema nervoso central em defeitos de linha média facial com hipertelorismo detectados por ressonância magnética e tomografia computadorizada

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    Vera Lúcia Gil-da-Silva-Lopes

    2006-12-01

    Full Text Available The aim of this study were to describe and to compare structural central nervous system (CNS anomalies detected by magnetic resonance image (MRI and computed tomography (CT in individuals affected by midline facial defects with hypertelorism (MFDH isolated or associated with multiple congenital anomalies (MCA. The investigation protocol included dysmorphological examination, skull and facial X-rays, brain CT and/or MRI. We studied 24 individuals, 12 of them had an isolated form (Group I and the others, MCA with unknown etiology (Group II. There was no significative difference between Group I and II and the results are presented in set. In addition to the several CNS anomalies previously described, MRI (n=18 was useful for detection of neuronal migration errors. These data suggested that structural CNS anomalies and MFDH seem to have an intrinsic embryological relationship, which should be taken in account during the clinical follow-up.Este estudo objetivou descrever e comparar as anomalias estruturais do sistema nervoso central (SNC detectadas por meio de ressonância magnética (RM e tomografia computadorizada (TC de crânio em indivíduos com defeitos de linha média facial com hipertelorismo (DLMFH isolados ou associados a anomalias congênitas múltiplas (ACM. O protocolo de investigação incluiu exame dismorfológico, RX de crânio e face, CT e RM de crânio. Foram estudados 24 indivíduos, sendo que 12 apresentavam a forma isolada (Grupo I e os demais, DLMFH com ACM de etiologia não esclarecida (Grupo II. Não houve diferença entre os dois grupos e os resultados foram agrupados. Além de várias anomalias de SNC já descritas, a RM foi útil para detecção de erros de migração neuronal. Os dados sugerem que as alterações estruturais de SNC e os DLMFH têm relação embriológica, o que deve ser levado em conta durante o seguimento clínico.

  1. Immediate adverse reactions to intravenous iodinated contrast media in computed tomography Reacciones adversas inmediatas al contraste yodado intravenoso en tomografía computarizada Reações adversas imediatas ao contraste iodado intravenoso em tomografia computadorizada

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    Beatriz Cavalcanti Juchem

    2007-02-01

    ório-descritiva, de caráter não experimental, com o objetivo de conhecer as reações adversas imediatas ao contraste iodado intravenoso em pacientes hospitalizados, submetidos a tomografia computadorizada num hospital-escola no Sul do Brasil. Durante o período de estudo, todas as reações adversas manifestaram-se na intensidade leve, com freqüência de 12,5% com o uso de contraste iodado iônico e 1% com contraste não iônico. Extravasamento do meio radiopaco ocorreu em 2,2% das injeções em veia periférica, não havendo complicações em nenhum dos casos. Os resultados encontram-se dentro dos limites citados na literatura internacional e sugere-se que os serviços de tomografia conheçam as próprias taxas de reações adversas ao contraste iodado e as condições em que elas ocorrem, a fim de obter evidências para a avaliação dos respectivos processos assistenciais.

  2. Prevalence of soft tissue calcifications in cone beam computed tomography images of the mandible = Prevalência de calcificações em tecido mole na região mandibular avaliadas por dois sistemas de tomografia computadorizada por feixe cônico

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    Nunes, Leiliane Ferreira da Silva

    2011-01-01

    Objetivo: Determinar a prevalência de calcificações em tecido mole na região mandibular por meio de análise de imagens axiais provenientes de dois sistemas de tomografia computadorizada por feixe cônico (TCFC), NewTom 3G® e Classic i-Cat® Método: Foram avaliadas 246 imagens da região mandibular. Destas, 163 foram adquiridas no aparelho NewTom 3G® e 83 no aparelho Classic i-Cat®. A análise estatística foi baseada no teste exato de Fisher e no teste Qui-quadrado para comparação das proporçõe...

  3. Análise das variações morfológicas da ATM em pacientes com artrite reumatóide através de tomografia computadorizada = Analysis of the morphologyc variations in the TMJ the patients with rheumatoid arthritis through the computer tomography

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    Vasconcelos, Belmiro Cavalcanti do Egito

    2005-01-01

    Full Text Available Realizou-se um estudo qualitativo e quantitativo enfocando as alterações morfométricas da articulação temporomandibular (ATM, em pacientes com o diagnóstico de artrite reumatóide (AR por meio de tomografia computadorizada. Foram analisados 6 casos onde são descritas as alterações estruturais dos componentes ósseos de 12 ATMs. Os resultados indicaram que todas as ATMs apresentaram alterações, sendo as alterações mais freqüentes a esclerose óssea subcondral, seguida do aplainamento da eminência articular. Todos os pacientes apresentaram distúrbio de mobilidade

  4. Avaliação da concordância interobservador na análise da tomografia computadorizada sem contraste no diagnóstico da urolitíase em pacientes com cólica renal aguda Interobserver agreement on non-contrast computed tomography interpretation for diagnosis of urolithiasis in patients with acute flank pain

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    Luís Ronan Marquez Ferreira de Souza

    2006-10-01

    Full Text Available OBJETIVO: Avaliar a reprodutibilidade da tomografia computadorizada sem contraste na avaliação da litíase ureteral e os sinais secundários de obstrução do sistema coletor em pacientes com cólica renal aguda. MATERIAIS E MÉTODOS: Estudo prospectivo de 52 pacientes com diagnóstico clínico de cólica renal aguda submetidos a exame de tomografia computadorizada de abdome sem contraste. Os exames foram realizados com técnica helicoidal e posteriormente analisados por três observadores independentes, com a concordância interobservador avaliada pelo método estatístico kappa (kapa. Foram analisados os parâmetros: a presença, localização e mensuração dos cálculos ureterais; b dilatação do sistema coletor intra-renal; c heterogeneidade da gordura perirrenal; d dilatação ureteral; e edema da parede ureteral (sinal do halo. RESULTADOS: Foram encontrados 40 cálculos ureterais na tomografia computadorizada (77%. A concordância interobservador para a identificação do cálculo ureteral e da dilatação ureteral foi quase perfeita (kapa = 0,89 e kapa = 0,87, respectivamente, substancial para dilatação do sistema coletor intra-renal (kapa = 0,77 e moderada para heterogeneidade da gordura perirrenal e para edema da parede ureteral (kapa = 0,55 e kapa = 0,56, respectivamente. CONCLUSÃO: A tomografia computadorizada de abdome sem contraste apresenta elevada reprodutibilidade na avaliação da litíase ureteral e dos sinais secundários de obstrução do sistema coletor.OBJECTIVE: To evaluate the interobserver agreement on non-contrast computed tomography interpretation by a group of experienced abdominal radiologists, for the study of urolithiasis in patients presenting acute flank pain. MATERIALS AND METHODS: Prospective study of 52 patients submitted to non-contrast enhanced helical computed tomography. The images were subsequently analyzed by three independent observers, with the interobserver agreement assessed by means of the

  5. Frequency of suspected cases of neurocysticercosis detected by computed skull tomography in Santa Maria, RS, Brazil Freqüência de casos suspeitos de neurocisticercose em tomografias computadorizadas de crânio em Santa Maria, RS, Brasil

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    José Edson Paz da SILVA

    2000-02-01

    Full Text Available Due to the lack of studies about neurocysticercosis in the South of Brazil, an investigation was conducted to determine the percentage of suspected cases of neurocysticercosis in computed tomography diagnoses in Santa Maria, RS, from January 1997 to December 1998. Of 6300 computed tomographies (CT of the skull performed at the private Hospital de Caridade Astrogildo de Azevedo, 80, i.e., 1.27% were suspected of neurocysticercosis. Fifty were women (62.5% and 30 were men (37.5%. The most frequent radiological manifestation indicating neurocysticercosis was the presence of calcifications (isolated or associated, with a 95% rate (76 cases, while the presence of hypodense lesions reached a 5% rate (4 cases. After routine analysis, each CT was evaluated again and the suspected cases were confirmed. The percentage of suspected cases of neurocysticercosis detected by CT in the present study carried out in Santa Maria was considered low (1.27%. This can be explained by the fact that tomography is not accessible to the economically underprivileged population of Santa Maria. We hope that the present study can alert the population and the professionals to the fact that neurocysticercosis is a more frequent disease than indicated by the few diagnoses made.Com o objetivo de iniciar um estudo sobre a neurocisticercose no Sul do Brasil, foi verificada a porcentagem de casos suspeitos de neurocisticercose em tomografia computadorizada de crânio (TCC em Santa Maria, entre janeiro de 1997 e dezembro de 1998. Os resultados mostraram que entre 6300 TCC realizadas no Hospital de Caridade Astrogildo de Azevedo, 80, isto é, 1,27% eram suspeitas de neurocisticercose. Constatamos que 50 eram mulheres (62,5% e 30 homens (37,5%. A manifestação radiológica mais freqüente para indicar neurocisticercose foi a calcificação (isolada ou associada com 95% (76 casos, enquanto a presença de lesões hipodensas foi de 5% (4 casos. Após a análise de rotina cada TCC foi

  6. Tuberculose pulmonar: achados na tomografia computadorizada de alta resolução do tórax em pacientes com doença em atividade comprovada bacteriologicamente Pulmonary tuberculosis: findings on high resolution computerized tomography of active disease on patients with bacteriological confirmation

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    CRISTIANE ALÓ CAMPOS

    2002-01-01

    Full Text Available Objetivo: Descrever os achados em pacientes com tuberculose pulmonar em atividade na tomografia computadorizada de alta resolução e o padrão de distribuição das lesões pelo parênquima pulmonar. Casuística e método: Foram analisadas retrospectivamente as tomografias de alta resolução de 42 pacientes com diagnóstico bacteriológico de tuberculose pulmonar ou forte suspeita clínica, com posterior confirmação bacteriológica. Resultados: Os principais sinais sugestivos de atividade encontrados foram nódulos do espaço aéreo (83%, nódulos centrolobulares (74%, aspecto de árvore em brotamento (67%, cavitações (67%, espessamento das paredes brônquicas (55%, consolidações (48%, opacidade em vidro fosco (21%, e espessamento do interstício pulmonar (9%. Conclusão: A tomografia computadorizada de alta resolução do tórax pode sugerir fortemente atividade da doença, sendo particularmente útil nos pacientes com baciloscopias negativas e/ou radiografias indeterminadas, permitindo a instituição de tratamento adequado, antes mesmo do crescimento da micobactéria em meio de cultura.Background: The aim of this study was to describe the signs of active tuberculosis in patients submitted to high resolution computerized tomography and the distribution of lesions along the pulmonary parenchyma. Material and methods: The high resolution CTs performed on 42 patients with tuberculosis either bacteriologically diagnosed or clinical suspected and later confirmed by bacteriological tests were studied. Results: The signs of disease activity observed were airspace nodule (83%, centrilobular nodule (74%, tree-in-bud pattern (67%, cavitations (67%, bronchial thickening (55%, parenchymal consolidations (48%, ground glass opacity (21% and thickening of the inter and intralobular septa (9%. Conclusion: High resolution computed tomography can be strongly suggestive of disease activity, is particularly helpful in patients with negative smear and

  7. Densitometria da vértebra dorsal, osso pleural e osso neural em tartarugas verdes hígidas por tomografia computadorizada quantitativa Densitometry of dorsal vertebrae, pleural bone and neural bone in healthy green sea turtles by quantitative computed tomography

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    Jannine Forattini de Oliveira

    2012-08-01

    Full Text Available A tomografia computadorizada quantitativa (TCQ é uma técnica com alta sensibilidade, aplicabilidade e precisão no diagnóstico de perda de massa óssea, entretanto a falta de valores de normalidade para animais silvestres limita a sua aplicação clínica. O presente estudo objetiva estabelecer valores médios de radiodensidade do osso trabecular das vértebras dorsais, osso pleural e osso neural de tartarugas marinhas juvenis hígidas utilizando a TCQ. Para isso, utilizou-se um grupo experimental de cinco animais que foram submetidos a exames de tomografia computadorizada helicoidal, sendo as mensurações da radiodensidade óssea realizadas ao nível da terceira, quarta e quinta vértebras dorsais. Os valores médios de radiodensidade do osso trabecular das vértebras dorsais, osso pleural e osso neural foram, respectivamente, de 287,4±39,1, 1093,74±100,4 e 1089,6±86,5 unidades Hounsfield (HU. Estudos complementares devem ser realizados em diferentes espécies e faixas etárias de quelônios para favorecer a aplicação clínica desta técnica.Quantitative computed tomography (QCT is a technique with high sensitivity, applicability and accuracy in the diagnosis of bone loss; however the lack of normal values for wild animals limits their clinical application. This study aims to establish medium values radiodensity trabecular bone of the dorsal vertebrae, bone pleural and neural bone in healthy juvenile sea turtles using the QTC. For this we used an experimental group of five animals that underwent helical computed tomography, and measurements of bone radiodensity conducted at the level of the third, fourth and fifth dorsal vertebrae. The medium values of radiodensity trabecular bone of the dorsal vertebrae, pleural bone, and neural bone were respectively 287.4±39.1, 1093.74±100.4, and 1089.6±86.5 Hounsfield units (HU. Further studies should be performed in different species and ages of turtles to encourage the clinical application of

  8. Computed tomography image of the mediastinal and axillary lymph nodes in clinically sound Rottweilers Imagem por tomografia computadorizada dos linfonodos axilares e mediastinais de cães rottweilers clinicamente saudáveis

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    Ana Carolina B. Fonseca Pinto

    2013-03-01

    smallest diameter of the axillary and mediastinal lymph nodes not surpassed 7mm and 8mm respectively. Their attenuations were equal or smaller than that of musculature in the post contrast scan.A tomografia computadorizada é uma modalidade diagnóstica que possibilita a avaliação detalhada dos linfonodos e que é capaz de detectar mais precocemente alterações envolvendo estas estruturas, que modalidades de imagem como a radiografia e a ultrassonografia. Tendo em vista a escassez de informações na literatura veterinária esta pesquisa objetivou fornecer informações sobre os aspectos tomográficos normais dos linfonodos axilares e mediastinais em cães. Realizou-se o exame tomográfico de 15 cães adultos, machos e fêmeas, da raça Rottweiler, selecionados como clinicamente normais por meio de anamnese, exame físico, hemograma, perfil bioquímico renal e hepático, eletrocardiograma e exame radiográfico do tórax. Após a injeção intravenosa do contraste iodado hidrossolúvel iônico, realizaram-se cortes tomográficos transversais do tórax com 10mm de espessura e 10mm de incremento em um tomógrafo axial. Os exames tomográficos foram avaliados buscando-se identificar os linfonodos axilares e mediastinais. Quando visibilizados, os linfonodos foram mensurados em seu menor eixo e sua atenuação foi comparada com a da musculatura. Foram calculados a média e desvio padrão da idade, do peso, do comprimento dos animais e do menor eixo dos linfonodos axilares e mediastinais. A média de idade dos animais e o desvio padrão foram de 3,87 anos ±2,03, do peso foi de 41,13kg ± 5,12 e do comprimento dos animais foi de 89,61cm ±2,63. Os linfonodos axilares foram visibilizados em 60% dos animais, a média das mensurações dos menores diâmetros e o desvio padrão foi de 3,58mm ±2,02 com valor mínimo de 1mm e máximo de 7mm. Dos 13 linfonodos observados 61,53% apresentaram-se hipoatenuantes comparativamente a musculatura e 30,77% isoatenuantes. Os linfonodos

  9. Sarcoma de Kaposi relacionado à síndrome da imunodeficiência adquirida: características do comprometimento hepático na tomografia computadorizada e na ressonância magnética Kaposi sarcoma related to acquired immunodeficiency syndrome: hepatic findings on computed tomography and magnetic resonance imaging

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    Daniel Nobrega da Costa

    2008-04-01

    Full Text Available Sarcoma de Kaposi é uma neoplasia associada a condições de imunossupressão que acomete os vasos linfáticos e sanguíneos. É a neoplasia intra-hepática mais comum na síndrome da imunodeficiência adquirida. A tomografia computadorizada e a ressonância magnética revelam múltiplos pequenos nódulos, proeminência e realce dos planos periportais, devido à presença de tecido neoplásico. Os autores descrevem um caso de paciente masculino, de 47 anos de idade, com síndrome da imunodeficiência adquirida e sarcoma de Kaposi disseminado.Kaposi sarcoma is a neoplasm associated with immunosuppressive conditions, and involving blood and lymphatic vessels. It is the most frequent intrahepatic neoplasm in patients with acquired immunodeficiency syndrome. Computed tomography and magnetic resonance imaging demonstrate multiple small nodules, prominence and contrast-enhancement of periportal branches due to the presence of the neoplastic tissue. The authors report a case of a 47-year-old male patient with acquired immunodeficiency syndrome presenting disseminated Kaposi sarcoma.

  10. Considerações sobre eficiência administrativa relacionado aos exames de ultra-sonografia, tomografia computadorizada e ressonância magnética nas afecções orbitárias Reasons for the administrative efficiency related to ultrassonography, computed tomography and magnetic resonance imaging tests in orbital diseases

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    Magno Watanabe

    2007-12-01

    Full Text Available OBJETIVOS: Enfocar os exames de ultra-sonografia (US, tomografia computadorizada (TC e ressonância magnética (RM, levantando, revisando e discutindo as seguintes medidas na melhoria da eficiência destes procedimentos na órbita: 1- Defasagem dos honorários médicos; 2- Vantagens e desvantagens dos exames; 3- Diretrizes clínicas. MÉTODOS: No período de julho de 2002 a março de 2003, realizou-se um levantamento dos valores dos exames orbitários de US, TC e RM pagos pelo Sistema Único de Saúde - SUS, operadoras de planos e seguros de saúde e particulares cobrados em três clínicas oftalmológicas e três clínicas radiológicas referenciadas. Pesquisa bibliográfica e revisão na literatura dos referidos exames e suas diretrizes clínicas nas afecções orbitárias. RESULTADOS: 1- Valores dos exames em reais (R$: US: 9,05 - SUS / 81,77 - AMB 90 / 57,01 - AMB/CIEFAS 93 / 102,00 - AMB/LPM 99 / 158,33 - particular. TC: 86,76 - SUS / 193,70 - AMB 90 / 196,30 - AMB/CIEFAS 93 / 204,12 - AMB/LPM 99 / 255,33 - particular. RM: 268,75 - SUS / 475,80 - AMB 90 e AMB/CIEFAS 93 / 472,50 - AMB/LPM 99 / 563,33 - particular; 2- Vantagens e desvantagens dos exames descritos de acordo com a revisão da literatura; 3- As doenças da órbita não têm ainda listadas suas diretrizes. CONCLUSÃO: Estes exames são os mais utilizados e consagrados pela sua eficácia no estudo da órbita. Para uma maior eficiência, devemos considerar as seguintes recomendações administrativas: 1- Modernização e atualização das tabelas de honorários com índices mínimos e mais justos na remuneração dos exames com reembolso dos insumos utilizados como filmes radiológicos e contrastes: 2- Promover e estimular a educação médica continuada, evitando o excesso de exames desnecessários ou inapropriados: 3- Elaboração e implementação de diretrizes e protocolos clínicos baseados em evidências nas principais doenças orbitárias que possam ser utilizados como refer

  11. Padronização de um método para mensuração das tábuas ósseas vestibular e lingual dos maxilares na Tomografia Computadorizada de Feixe Cônico (Cone Beam Methodology standardization for measuring buccal and lingual alveolar bone plates using Cone Beam Computed Tomography

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    Marcos Cezar Ferreira

    2010-02-01

    Full Text Available INTRODUÇÃO: a espessura das tábuas ósseas que recobrem os dentes por vestibular e lingual constitui um dos fatores limitantes da movimentação dentária. O avanço tecnológico em Imaginologia permitiu avaliar detalhadamente essas regiões anatômicas por meio da utilização da tomografia computadorizada de feixe cônico (TCFC. OBJETIVO: descrever e padronizar, pormenorizadamente, um método para mensuração das tábuas ósseas vestibular e lingual dos maxilares nas imagens de tomografia computadorizada de feixe cônico. METODOLOGIA: a padronização digital da posição da imagem da face deve constituir o primeiro passo antes da seleção dos cortes de TCFC. Dois cortes axiais de cada maxilar foram empregados para a mensuração da espessura do osso alveolar vestibular e lingual. Utilizou-se como referência a junção cemento-esmalte dos primeiros molares permanentes, tanto na arcada superior quanto na inferior. RESULTADOS: cortes axiais paralelos ao plano palatino foram indicados para avaliação quantitativa do osso alveolar na maxila. Na arcada inferior, os cortes axiais devem ser paralelos ao plano oclusal funcional. CONCLUSÃO: o método descrito apresenta reprodutibilidade para utilização em pesquisas, assim como para a avaliação clínica das repercussões periodontais da movimentação dentária, ao permitir a comparação de imagens pré e pós-tratamento.INTRODUCTION: The thickness of the buccal and lingual bone plates constitutes one of the limiting factors of the orthodontic movement. The imaging technology has permitted the evaluation of this anatomical region, by means of cone beam computed tomography. PURPOSE: To describe and standardize, in details, a method for measuring the buccal and lingual bone plate thickness in CBCT images. METHODOLOGY: Digital standardization of face image should constitute the first step before the selection of CBCT slices. Two axial sections of each jaw were used for measuring the thickness

  12. Disgenesia do corpo caloso e más-formações associadas: achados de tomografia computadorizada e ressonância magnética Dysgenesis of the corpus callosum and associated malformations: computed tomography and magnetic resonance imaging findings

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    Cristiano Montandon

    2003-10-01

    Full Text Available O termo disgenesia do corpo caloso refere-se a uma má-formação deste com origem na embriogênese do telencéfalo. O relato analisa os achados de tomografia computadorizada e ressonância magnética em 11 pacientes com disgenesia calosa e em um caso de corpo caloso normal com lipoma associado. Esta pode ser distinguida em três grupos: agenesia total (três casos, agenesia parcial (seis casos e hipoplasia (dois casos. Anomalias associadas foram observadas em nove casos, incluindo má-formação de Chiari tipo II (um caso, esquizencefalia (um caso, cisto inter-hemisférico (dois casos, heterotopia nodular (um caso, cisto de Dandy-Walker (um caso e lipoma do corpo caloso (quatro casos. Este artigo demonstra um espectro destes distúrbios, auxiliando na sua interpretação diagnóstica.Callosal dysgenesis is a malformation of the corpus callosum with origins in the embryogenesis of the telencephalon. We reviewed the computed tomography and magnetic resonance imaging findings of 11 patients with callosal dysgenesis and one patient with normal corpus callosum associated with a lipoma. The patients were divided into three distinct groups: total agenesis (three patients, partial agenesis (six patients and hypoplasia (two patients. Associated abnormalities were observed in nine patients, including Chiari II malformation (one patient, schizencephaly (one patient, interhemispheric cyst (two patients, Dandy-Walker cyst (one patient, nodular heterotopy (one patient and lipoma of the corpus callosum (four patients. This paper presents a review that may contribute to the diagnosis of these disorders.

  13. Esvaziamento gástrico após administração oral de contraste em tomografia computadorizada do abdômen: descrição de seis casos

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    Martins Fernando Antonio Nogueira da Cruz

    2004-01-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A lesão pulmonar secundária à aspiração do conteúdo gástrico é complicação associada à perda dos reflexos protetores das vias aéreas. Neste contexto, a realização de exames tomográficos que incluem a contrastação do trato digestivo exige particular atenção em crianças abaixo de cinco anos, que necessitam anestesia geral ou sedação para assegurar imobilidade durante o procedimento. A indução da anestesia ou sedação, após ingestão da solução de contraste pode trazer risco substancial para a broncoaspiração do conteúdo gástrico. Isto faz com que se opte por administrar o contraste por sonda gástrica após a intubação traqueal, uma vez que não se conhece o tempo de esvaziamento gástrico após utilização de solução contrastante. Esta conduta representa aumento do tempo de anestesia, o que resulta em constante questionamento sobre a possibilidade de esvaziamento do conteúdo gástrico em tempo inferior a uma hora. Seis casos de pacientes submetidos à tomografia de abdômen foram avaliados quanto ao esvaziamento gástrico por meio da realização de cortes tomográficos na topografia do estômago, com o objetivo de determinar a presença ou ausência de conteúdo residual líquido nesse órgão, após a administração da solução de contraste. RELATO DOS CASOS: Foram avaliadas seis crianças submetidas à tomografia contrastada do abdômen. Duas, não anestesiadas, apresentaram expressivo resíduo líquido gástrico decorridos 50 e 45 minutos, respectivamente, da ingestão de contraste. Quatro, submetidas à anestesia geral, também apresentaram resíduo líquido gástrico decorridos 40 a 50 minutos da administração de contraste via sonda oro/nasogástrica. Em duas destas persistiu apreciável resíduo líquido no estômago, mesmo após a aspiração do conteúdo pela sonda. CONCLUSÕES: Nos casos observados, o período de 40 a 50 minutos foi insuficiente para o esvaziamento do

  14. Neoplasias pulmonares difusas em pacientes com a síndrome de imunodeficiência adquirida Correlação da tomografia computadorizada de alta resolução com a anatomopatologia

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    Edson Marchiori

    2002-03-01

    Full Text Available RESUMO: Neste artigo foram discutidos os principais aspectos tomográficos das neoplasias pulmonares difusas que acometem o paciente com a síndrome da imunodeficiência adquirida. Com este objetivo foram revistas as tomografias computorizadas de alta resolução de 8 pacientes, 4 deles com linfomas do tipo não-Hodgkin e 4 com sarcoma de Kaposi, e feita correlação com os achados anatomo-patológicos. O principal aspecto observado foi a disseminação linfática, determinando espessamen-to das bainhas broncovasculares, dos septos interlobulares e da superfície pleural. Em ambas as doenças tal aspecto deveu-se à infiltração destes compartimentos pelas células neoplásicas. Outros aspectos observados foram os nódulos de limites mal definidos no sarcoma de Kaposi, e múltiplos nódulos com broncograma aéreo, e consolidação parenquimatosa, nos linfomas. Derrames pleurais foram detectados em ambas as doenças.REV PORT PNEUMOL 2002; VIII (2: ABSTRACT: In this article we discuss the main computed tomographic aspects of diffuse pulmonary neoplasias in AIDS patients. For this purpose we reviewed the High Resolution CT of eight patients, four of them with Non-Hodgkin Lymphoma, and four with Kaposi’s sarcoma, and correlated with anatomopathologic findings. The main finding was lymphatic spread which produces peribronchovascular, septal interlobular and pleural thickening. In both diseases this aspects were caused by neoplastic cells infiltration of these compartments. Other findings includes ill defined nodules in Kaposi’s sarcoma and multiple nodules with air-bronchograms and parenchymal consolidations in lymphomas. Pleural effusions were seen in both diseases.REV PORT PNEUMOL 2002; VIII (2: Palavras-chave: SIDA, pulmões, TCAR, anatomopatologia, sarcoma de Kaposi, linfomas, Key-words: AIDS, lungs, HRCT, anatomopathology, Kaposi’s sarcoma, lymphoma

  15. Auxílio da tomografia computadorizada no planejamento pré-operatório de pacientes portadores de escoliose idiopática do adolescente Auxilio de la tomografía computarizada en el plan preoperatorio de pacientes portadores de escoliosis idiopática del adolescente Computed tomography aid in preoperative planning of patients with adolescent idiopathic scoliosis

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    Rodrigo Rezende

    2010-03-01

    Full Text Available A escoliose idiopática do adolescente (EIA é uma doença diagnosticada no início da puberdade. Ela apresenta etiologia indefinida e caracteriza-se pelo desvio lateral da coluna vertebral maior que 10°, associado à rotação do corpo vertebral. O uso de instrumentação de terceira geração produziu um melhor resultado na correção da curva do que as técnicas anteriores. Porém, ainda existem dificuldades técnicas no momento da passagem e da escolha dos parafusos pediculares, devido à angulação e ao diâmetro dos pedículos vertebrais. Apesar de apresentar vantagens, essa técnica não é isenta de riscos e complicações, necessitando de uma maior curva de aprendizado pelo médico-cirurgião, bem como de um adequado planejamento pré-operatório. Até o momento, não há na literatura relato sobre a utilização da tomografia computadorizada no auxílio do planejamento cirúrgico de pacientes com escoliose. Diante do exposto, objetivamos, no presente estudo, descrever uma técnica de planejamento pré-operatório, com o auxílio da tomografia computadorizada para a fixação da coluna em pacientes com escoliose idiopática do adolescente, especificando a angulação e o diâmetro dos pedículos vertebrais, o que poderá auxiliar o médico-cirurgião no momento da fixação.La escoliosis idiopática en el adolescente (EIA es una enfermedad diagnosticada en el inicio de la pubertad. Esta presenta una etiología indefinida y es caracterizada por el desvío lateral de la columna vertebral por encima de los diez grados asociados a la rotación del cuerpo vertebral. El uso de instrumentación de tercera generación produjo un mejor resultado en la corrección de la curva comparado con las técnicas anteriores. Sin embargo, existen dificultades técnicas en el momento del paso y de escoger los tornillos pediculares debido a la angulación y al diámetro de los pedículos vertebrales. A pesar de presentar ventajas, esta técnica no est

  16. Reprodutibilidade das mensurações da espessura das tábuas ósseas na tomografia computadorizada Cone-Beam utilizando diferentes protocolos de aquisição de imagem Reproducibility of bone plate thickness measurements with Cone-Beam Computed Tomography using different image acquisition protocols

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    Carolina Carmo de Menezes

    2010-10-01

    Full Text Available INTRODUÇÃO: quanto menor a dimensão do voxel, maior a nitidez da imagem de tomografia computadorizada Cone-Beam (TCCB, porém, maior a dose de radiação emitida. OBJETIVOS: avaliar e comparar a reprodutibilidade da mensuração da espessura das tábuas ósseas vestibular e lingual em imagens de TCCB, utilizando diferentes protocolos de aquisição de imagem com variação da dimensão do voxel. MÉTODOS: exames de TCCB foram tomados de 12 mandíbulas humanas secas, com dimensão do voxel de 0,2; 0,3 e 0,4mm, no aparelho i-CAT Cone-Beam 3-D Dental Imaging System. No software i-CAT Viewer, foi mensurada a espessura das tábuas ósseas vestibular e lingual, em um corte axial passando 12mm acima do forame mentoniano do lado direito. A reprodutibilidade intraexaminador foi avaliada por meio da aplicação do teste t pareado. Para a comparação interexaminadores, foi utilizado o teste t independente. Os resultados foram considerados com o nível de significância de 5%. RESULTADOS: observou-se uma excelente reprodutibilidade interexaminadores para os três protocolos avaliados. A reprodutibilidade intraexaminadores foi muito boa, com exceção de algumas regiões dos dentes anteriores, que mostraram diferenças estatisticamente significativas, independentemente da dimensão do voxel. CONCLUSÃO: a mensuração da espessura das tábuas ósseas vestibular e lingual em imagens de TCCB mostrou boa precisão para exames obtidos com voxel de 0,2; 0,3 ou 0,4mm. A reprodutibilidade das mensurações na região anterior da mandíbula foi mais crítica do que na região posterior.INTRODUCTION: A smaller voxel dimension leads to greater resolution of Cone-Beam Computed Tomography (CBCT, but a greater dosage of radiation is emitted. OBJECTIVE: Assess and compare the reproducibility of buccal and lingual bone plate thickness measurements in CBCT images using different image acquisition protocols, with variations in the voxel dimension. METHODS: CBCT exams

  17. Estudo de caso de oferta induzindo a demanda: o caso da oferta de exames de imagem (tomografia axial computadorizada e ressonância magnética na Unimed-Manaus Case study of supply induced demand: the case of provision of imaging scans (computed tomography and magnetic resonance at Unimed-Manaus

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    Edson de Oliveira Andrade

    2011-04-01

    Full Text Available OBJETIVO: Apresentar a experiência de uma operadora de plano de saúde (Unimed-Manaus na cidade de Manaus, Estado do Amazonas, com o credenciamento de serviços de imagem e a indução de demanda pela oferta dos novos serviços (Lei de Roemer. MÉTODOS: Trata-se de uma pesquisa de caráter retrospectivo, com estudo de série temporal, abordando o período de janeiro de 1998 a junho de 2004, lapso de tempo em que ocorreu a implantação dos serviços de tomografia computadorizada e da ressonância magnética no âmbito dos serviços oferecidos por aquele plano de saúde. A análise estatística consistiu em uma parte descritiva e uma inferencial, sendo esta última utilizando teste paramétrico de média (teste t de Student e ANOVA e o teste de correlação de Pearson. Foi adotado um alfa de 5% e um intervalo de confiança de 95%. RESULTADOS: Foi possível identificar na Unimed-Manaus que a oferta de novos serviços de imagem foi capaz de, por si só, gerar um aumento da demanda do serviço caracterizando o fenômeno descrito por Roemer. CONCLUSÃO: Os resultados deste trabalho ressaltam a necessidade de se estar atento ao fato de que a oferta de novos serviços no setor da saúde poderá acarretar, por si só, um aumento de sua utilização sem que haja uma demanda real.OBJECTIVE: To present the experience of a health plan operator (Unimed-Manaus in Manaus, Amazonas, Brazil, with the accreditation of imaging services and the demand induced by the supply of new services (Roemer's Law. METHODS: This is a retrospective work studying a time series covering the period from January 1998 to June 2004, in which the computed tomography and the magnetic resonance imaging services were implemented as part of the services offered by that health plan operator. Statistical analysis consisted of a descriptive and an inferential part, with the latter using a mean parametric test (Student T-test and ANOVA and the Pearson correlation test. A 5% alpha and a 95

  18. Opacidades em vidro fosco nas doenças pulmonares difusas: correlação da tomografia computadorizada de alta resolução com a anatomopatologia Ground-glass opacity in diffuse lung diseases: high-resolution computed tomography-pathology correlation

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    Maria Lúcia de Oliveira Santos

    2003-12-01

    Full Text Available Opacidade em vidro fosco é achado freqüentemente visto na tomografia computadorizada de alta resolução do tórax e se traduz pelo aumento do coeficiente de atenuação dos pulmões, mas sem apagar as marcas broncovasculares. Por sua inespecificidade, a associação com outros achados radiológicos, clínicos e anatomopatológicos deve ser considerada para uma interpretação diagnóstica mais correta. Neste trabalho foram analisados 62 exames tomográficos de pacientes com doenças pulmonares difusas, de 14 etiologias diferentes, em que opacidades em vidro fosco foram o achado único ou predominante, e feita correlação anatomopatológica por meio de biópsias ou necropsias. Na pneumocistose as opacidades em vidro fosco corresponderam, histologicamente, à ocupação alveolar por material espumoso contendo parasitos; no carcinoma bronquíolo-alveolar, a espessamento dos septos alveolares e ocupação de sua luz por muco e células tumorais; na paracoccidioidomicose, a espessamento dos septos alveolares, áreas de fibrose e alvéolos contendo exsudato broncopneumônico; na sarcoidose, a fibrose ou a acúmulo de granulomas; na fibrose pulmonar idiopática, a espessamento dos septos alveolares por fibrose; na bronquiolite obliterante com pneumonia em organização, a pneumonia intersticial com áreas de organização intra-alveolar. A ocupação alveolar por sangue foi observada nos casos de leptospirose, hemossiderose idiopática, metástases de tumor renal e na aspergilose invasiva; por vacúolos de gordura na pneumonia lipídica; por material protéico e lipoprotéico na silicoproteinose e na proteinose alveolar; e por líquido de edema na insuficiência cardíaca congestiva.Ground-glass opacity is a finding frequently seen in high-resolution computed tomography examinations of the chest and is characterized by hazy increased attenuation of lung, however without blurring of bronchial and vascular margins. Due to its unspecificity

  19. Tomografia computadorizada de alta resolução na silicose: correlação com radiografia e testes de função pulmonar High-resolution computed tomography in silicosis: correlation with chest radiography and pulmonary function tests

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    Agnaldo José Lopes

    2008-05-01

    Full Text Available OBJETIVO: Correlacionar os parâmetros tomográficos com os de função pulmonar em portadores de silicose, bem como comparar os resultados da tomografia computadorizada de alta resolução (TCAR com os da radiografia de tórax. MÉTODOS: Foi realizado um estudo de corte transversal, em que foram avaliados 44 pacientes não-tabagistas e sem história pregressa de tuberculose. As radiografias foram classificadas de acordo com a proposta da Organização Internacional do Trabalho. Utilizando um sistema de escore semiquantitativo, os seguintes achados na TCAR foram quantificados: extensão total do envolvimento pulmonar, opacidades parenquimatosas e enfisema. Foram realizados espirometria, oscilações forçadas, avaliação dos volumes pulmonares pela técnica de diluição com hélio e medida da diffusing capacity of the lung for carbon monoxide (DLCO, capacidade de difusão do monóxido de carbono. RESULTADOS: Dos 44 pacientes estudados, 41 eram homens, com média de idade de 48,4 anos. Na análise comparativa, 4 pacientes classificados na categoria 0 pela radiografia foram reclassificados na categoria 1 pela TCAR e, enquanto a radiografia diagnosticou 23 casos de fibrose maciça progressiva, a TCAR estabeleceu esse diagnóstico em 33 doentes. Para o escore de opacidades, as maiores correlações foram observadas com as medidas de fluxo, DLCO e complacência. Já o enfisema correlacionou-se negativamente com as medidas de volume, DLCO e fluxo. Nesta amostra com predomínio de grandes opacidades (75% dos indivíduos, a deterioração da função pulmonar associou-se com a extensão das alterações estruturais. CONCLUSÕES: Na silicose, a TCAR é superior à radiografia tanto na detecção precoce da doença quanto na identificação de fibrose maciça progressiva.OBJECTIVE: To correlate tomographic findings with pulmonary function findings, as well as to compare chest X-ray findings with high resolution computed tomography (HRCT findings, in

  20. Avaliação pulmonar em crianças portadoras de cardiopatia congênita acianótica e hiperfluxo pulmonar através de tomografia computadorizada Evaluación pulmonar en niños portadores de cardiopatía congénita acianótica e hiperflujo pulmonar a través de tomografía computadorizada Computed tomography in pulmonary evaluation of children with acyanotic congenital heart defect and pulmonary hyperflow

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    Solange Gimenez

    2009-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Disfunção respiratória é frequente em crianças com cardiopatias congênitas acianóticas com hiperfluxo pulmonar (CCAHP, porém pouco é conhecido sobre a estrutura pulmonar destes pacientes. O objetivo deste estudo foi quantificar os volumes de gás e tecido e a distribuição da aeração pulmonar nesta população. MÉTODOS: Após aprovação do Comitê de Ética institucional e obtenção do consentimento escrito pós-informado, foram obtidas tomografias computadorizadas torácicas em sete crianças com CCAHF. As imagens pulmonares direita e esquerda foram contornadas em todas as imagens e os volumes e pesos pulmonares foram computados a partir dos dados volumétricos. As comparações entre esquerda e direita foram analisadas usando teste t de Student pareado e as correlações através de regressão exponencial. RESULTADOS: A idade mediana foi 20 meses e o peso foi de 9,9 kg. Volume pulmonar total (VPT foi de 66,7 ± 23,1 mL.kg-1, o de tecido 33,5 ± 15,7 mL.kg-1 e o de gás 33,1 ± 8,3 mL.kg-1. O pulmão direito representou 57,9% e o pulmão esquerdo 42,1% do VPT (p JUSTIFICATIVA Y OBJETIVOS: La disfunción respiratoria es frecuente en niños con cardiopatías congénitas acianóticas con hiperflujo pulmonar (CCAHP, sin embargo, se conoce muy poco sobre la estructura pulmonar de esos pacientes. El objetivo de este estudio, fue cuantificar los volúmenes de gas y tejido y la distribución de la aeración pulmonar en esa población. MÉTODOS: Después de la aprobación por parte del Comité de Ética Institucional y de la obtención del consentimiento escrito informado, se obtuvieron tomografías computadorizadas torácicas en siete niños con CCAHF. Las imágenes pulmonares derecha e izquierda fueron perfiladas en todas las imágenes, y los volúmenes y los pesos pulmonares fueron computados a partir de los datos volumétricos. Las comparaciones entre izquierda y derecha fueron analizadas usando el test t de

  1. Applicability of 3D-CT facial reconstruction for forensic individual identification Aplicabilidade da reconstrução facial em 3D-TC para identificação individual forense

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    Sara dos Santos Rocha

    2003-03-01

    Full Text Available Computed tomography (CT is used in several clinical dentistry applications even by axial slices and two and three-dimensional reconstructed images (2D-CT and 3D-CT. The purpose of the current study is to assess the precision of linear measurements made in 3D-CT using craniometric patterns for individual identification in Forensic Dentistry. Five cadaver heads were submitted to a spiral computed tomography using axial slices, and 3D-CT reconstructions were obtained by volume rendering technique with computer graphics tools. Ten (10 craniometric measurements were determined in 3D-CT images by two examiners independently, twice each, and the standard error of intra- and inter-examiner measurements was assessed. The results demonstrated a low standard error of those measurements, from 0.85% to 3.09%. In conclusion, the linear measurements obtained in osseous and soft tissue structures were considered to be precise in 3D-CT with high imaging quality and resolution.A tomografia computadorizada (TC tem sido utilizada em diversas áreas clínicas da Odontologia; utilizam-se tanto seus cortes originais quanto as reconstruções em duas e três dimensões (2D-TC e 3D-TC. O presente estudo propõe avaliar a precisão das medidas lineares realizadas na 3D-TC, utilizando a craniometria, para fins de identificação individual na Odontologia Forense. Cinco cabeças de cadáveres foram submetidas a tomografia computadorizada em espiral por meio de cortes axiais e reconstruções em 3D-TC foram obtidas por meio da técnica de volume, utilizando recursos da computação gráfica. Medidas craniométricas (n = 10 foram determinadas nas imagens em 3D-TC por dois examinadores independentemente, duas vezes cada um, e uma análise de erro padrão percentual das medidas intra- e inter-examinadores foi realizada. Os resultados demonstraram um erro padrão percentual baixo apresentado por essas medidas, variando entre 0,85% e 3,09%. Em conclusão, as medidas lineares

  2. Proteinose alveolar pulmonar Aspectos na tomografia computadorizada de alta resolução** Trabalho realizado nos Departamentos ou Serviços de Radiologia da Universidade Federal Fluminense (UFF - RJ; Hospital Universitário Clementino Fraga Filho - RJ; Faculdade de Medicina de São José do Rio Preto (FAMERP -SP; Universidade de Campinas (UNICAMP - SP; Pavilhão Pereira Filho - RS, e Universidade Federal de Santa Catarina - SC.

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    Erick Malheiro Leôncio Martins

    2002-07-01

    Full Text Available RESUMO: A proteinose alveolar pulmonar é uma doença rara cuja etiologia ainda permanece desconhecida. É caracterizada pelo preenchimento alveolar por um material proteináceo que determina um quadro pulmonar restritivo com hipoxemia e várias alterações radiológicas. Neste trabalho são analisadas e discutidas as alterações encontradas nas tomografias computadorizadas de alta resolução de doze pacientes com proteinose alveolar pulmonar. Seis casos eram da forma primária da doença, e os outros seis da secundária, estando associados à silicose, asbestose, leucemia, síndrome da imunodeficiência adquirida e lúpus eritematoso sistémico. O objectivo básico foi estudar as alterações tomográficas mais frequentes. Na maioria dos casos, os aspectos tomográficos foram correlacionados com os dados anatomopatológicos, provenientes de biópsias cirúrgicas ou necropsia. Os aspectos tomográficos mais frequentes foram as opacidades em vidro fosco, com distribuição geográfica, associadas a espessamento liso dos septos interlobulares, resultando no padrão de pavimentação em mosaico. Estas alterações foram encontradas em todos os pacientes com a forma primária, não predominando em nenhuma região pulmonar específica. Na forma secundária, cinco dos seis casos apresentavam alterações tomográficas não observadas na forma primária da doença como, por exemplo, placas pleurais, derrame pleural, nódulos centrolobulares, linfonodomegalias e padrão de vidro fosco sem associação com espessamento de septos interlobulares. Além disto, em três destes casos houve um predomínio das lesões nas regiões póstero-inferiores dos pulmões.REV PORT PNEUMOL 2002; VIII(4: 303-314 ABSTRACT: Pulmonary alveolar proteinosis is a rare condition and it’s etiology remains unknown. It is characterized by the accumulation

  3. Preparation of an application for the control of the dose delivered by equipment of computed tomography (CT); Elaboracion de una aplicacion para el control de la dosis impartida por equipos de tomografia computerizada (TC)

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    Torres Cabrera, R.; Agulla Otero, M.; Hernando Gonzalez, I.

    2013-07-01

    Although TC are native digital equipment, the collection and treatment of the doses given to the patients it continues to present difficulties to date, especially in the still very large number of teams that do not produce a formal report of dose (SR). This work shows the experience gained in the development of an application that allows the calculation, monitoring and control of the dose given to patients by teams of TC. (Author)

  4. Espessura do tecido subcutaneo como preditor independente de ruido em imagem de TC cardiaca

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    Henrique Lane Staniak

    2014-01-01

    Full Text Available Fundamento: Há poucos dados sobre a definição de parâmetros simples e robustos para predizer artefato de imagem em tomografia computadorizada (TC cardíaca. Objetivos: Avaliar o valor da simples medida da espessura do tecido subcutâneo (espessura pele-esterno como preditor de artefato de imagem em TC cardíaca. Métodos: O estudo avaliou 86 pacientes submetidos a angiotomografia computadorizada cardíaca (ATCC com sincronização prospectiva com ECG e avaliação de escore de cálcio coronário com 120 kV e 150 mA. A qualidade da imagem foi medida objetivamente pelo artefato de imagem na aorta em ATCC, sendo 'artefato baixo' definido como aquele < 30 UH. Os diâmetros torácicos anteroposterior e laterolateral, o artefato de imagem na aorta e a espessura pele-esterno foram medidos como preditores de artefato em ATCC. A associação de preditores e artefato de imagem foi avaliada usando-se correlação de Pearson. Resultados: A dose média de radiação foi 3,5 ± 1,5 mSv. O artefato de imagem médio na ATCC foi de 36,3 ± 8,5 UH, sendo o artefato de imagem médiona fase sem contraste do exame de 17,7 ± 4,4 UH. Todos os preditores foram independentemente associados com artefato em ATCC. Os melhores preditores foram espessura pele-esterno, com correlação de 0,70 (p < 0,001, e artefato de imagem na fases em contraste,com correlação de 0,73 (p < 0,001. Ao avaliar a habilidade de predizer artefato de imagem baixo, as áreas sob a curva ROC para o artefato de imagem na fases em contraste e para a espessura pele-esterno foram 0,837e 0,864, respectivamente. Conclusão: Tanto espessura pele-esterno quanto artefato de escore de cálcio são preditores simples e precisos de artefato de imagem em ATCC. Tais parâmetros podem ser incorporados aos protocolos de TC padrão para ajustar adequadamente a exposição à radiação.

  5. 3D-CT imaging processing for qualitative and quantitative analysis of maxillofacial cysts and tumors Processamento de imagens em 3D-TC para análise qualitativa e quantitativa de cistos e tumores maxilo-faciais

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    Marcelo de Gusmão Paraiso Cavalcanti

    2002-09-01

    Full Text Available The objective of this study was to evaluate spiral-computed tomography (3D-CT images of 20 patients presenting with cysts and tumors in the maxillofacial complex, in order to compare the surface and volume techniques of image rendering. The qualitative and quantitative appraisal indicated that the volume technique allowed a more precise and accurate observation than the surface method. On the average, the measurements obtained by means of the 3D volume-rendering technique were 6.28% higher than those obtained by means of the surface method. The sensitivity of the 3D surface technique was lower than that of the 3D volume technique for all conditions stipulated in the diagnosis and evaluation of lesions. We concluded that the 3D-CT volume rendering technique was more reproducible and sensitive than the 3D-CT surface method, in the diagnosis, treatment planning and evaluation of maxillofacial lesions, especially those with intra-osseous involvement.O presente trabalho consiste em um estudo associativo e comparativo entre as técnicas de superfície e volume para a reconstrução de imagens em três dimensões (3D utilizando tomografia computadorizada (TC. Foram realizadas tomografias computadorizadas em espiral de 20 pacientes com cistos e tumores do complexo maxilo-facial para análise qualitativa e quantitativa, utilizando métodos de superfície e de volume em 3D. A comparação interexaminadores apresentou erro padrão percentual menos elevado para a técnica de volume (1,94% que para a técnica de superfície (4,38%, indicando a maior reprodutibilidade do primeiro método. As medidas obtidas pela técnica de volume foram em média 6,28% mais elevadas que as medidas obtidas pela técnica de superfície. A técnica de volume apresentou sensibilidade mais elevada que a técnica de superfície na identificação das lesões do complexo maxilo-facial. A técnica de volume em 3D-TC, utilizando a metodologia da computação gráfica, apresentou maior

  6. Analysis of the computed tomography in the acute abdomen; Analise da tomografia computadorizada no abdome agudo

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    Hochhegger, Bruno [Complexo Hospitalar Santa Casa de Porto Alegre, RS (Brazil); Moraes, Everton [Universidade Federal de Santa Maria (UFSM), RS (Brazil); Haygert, Carlos Jesus Pereira; Antunes, Paulo Sergio Pase [Hospital Universitario de Santa Maria, RS (Brazil); Gazzoni, Fernando [Pontificia Universidade Catolica de Porto Alegre (PUC-RS), Porto Alegre, RS (Brazil). Hospital Sao Lucas; Andrade, Rubens Gabriel Feijo [Fundacao Universitaria de Cardiologia de Porto Alegre, RS (Brazil). Inst. de Cardiologia; Bueno, Leticia Rossi [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil); Lopes, Luis Felipe Dias [Universidade Federal de Santa Maria (UFSM), RS (Brazil). Dept. de Estatistica]. E-mail: brunorgs@pop.com.br

    2007-07-01

    Introduction: This study tends to test the capacity of the computed tomography in assist in the diagnosis and the approach of the acute abdomen. Material and method: This is a longitudinal and prospective study, in which were analyzed the patients with the diagnosis of acute abdomen. There were obtained 105 cases of acute abdomen and after the application of the exclusions criteria were included 28 patients in the study. Results: Computed tomography changed the diagnostic hypothesis of the physicians in 50% of the cases (p < 0.05), and the confidence index in 85.71% of the cases (p 0.014). Computed tomography also altered the management in 46.43% of the cases (p > 0.05), where 78.57% of the patients had surgical indication before computed tomography and 67.86% after computed tomography (p = 0.0546). The index of accurate diagnosis of computed tomography, when compared to the anatomopathologic examination and the final diagnosis, was observed in 82.14% of the cases (p = 0.013). When the analysis was done dividing the patients in surgical and nonsurgical group, were obtained an accuracy of 89.28% (p 0.0001). The difference of 7.2 days of hospitalization (p = 0.003) was obtained compared with the mean of the acute abdomen without use the computed tomography. Conclusion: The computed tomography is correlative with the anatomopathology and has great accuracy in the surgical indication, associated with the capacity of increase the confident index of the physicians, reduces the hospitalization time, reduces the number of surgeries and is cost-effective. (author)

  7. Linfoma renal: espectro de imagens na tomografia computadorizada Renal lymphoma: spectrum of computed tomography findings

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    Carol Pontes de Miranda Maranhão

    2005-04-01

    Full Text Available O acometimento renal no linfoma é raro, uma vez que o rim não possui tecido linfóide. O envolvimento secundário é mais freqüente, ocorrendo em até um terço das autópsias dos portadores de linfoma. Alguns autores acreditam que esta seja a única forma de acometimento renal, questionando a existência do linfoma primário. O linfoma renal representaria metástases hematogênicas ou invasão direta do tumor ocorrendo no espaço perirrenal. A partir destes tipos de envolvimento decorrem as formas de apresentação do linfoma renal: múltiplos nódulos, massa solitária, invasão renal por doença retroperitoneal contígua, doença perirrenal e infiltração difusa. Neste trabalho são discutidas e apresentadas imagens destas diferentes formas de acometimento.Isolated renal lymphoma is rare due to the absence of lymphoid tissue in kidneys. Secondary involvement occurs more frequently and is reported in up to 1/3 of the autopsies of patients who died from lymphoma. Some authors believe this is actually the only existing form of renal lymphoma. The involvement of the kidney by lymphoma would occur through hematogenic metastasis or direct tumor invasion of the perirenal space. These different types of involvement determine the several forms of renal lymphoma presentation: multiple nodules, solitary mass, renal invasion from contiguous retroperitoneal disease, perirenal disease and diffuse infiltration. In this study the imaging findings features of the different forms of involvement are presented and discussed.

  8. Computed tomography study of otitis media; A tomografia computadorizada no estudo das otites medias

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    Bahia, Paulo Roberto Valle; Marchiori, Edson [Universidade Federal, Rio de Janeiro, RJ (Brazil). Dept. de Radiologia

    1997-03-01

    The findings of computed tomography (CT) of 89 patients clinically suspected of having otitis media were studied in this work. Such results were compared to clinical diagnosis, otoscopy, surgical findings and previous data. Among the results of our analysis, we studied seven patients with acute otitis media and 83 patients with chronic otitis media. The patients with acute otitis media have undergone CT examinations to evaluate possible spread to central nervous system. The diagnosis of cholesteatoma, its extension and complications were the main indication. for chronic otitis media study. The main findings of the cholesteatomatous otitis were the occupation of the epitympanun, the bony wall destruction and the ossicular chain erosion. The CT demonstrated a great sensibility to diagnose the cholesteatoma. (author) 25 refs., 10 figs.

  9. Quality index on computed tomography; Índice da qualidade em tomografia computadorizada

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    Travassos, P.C.B.; Magalhães, L.A.G., E-mail: pctravassos@gmail.com [Instituto de Radioproteção e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Peixoto, J.G.P. [Universidade do Estado do Rio de Janeiro (LCR/UERJ), RJ (Brazil)

    2017-07-01

    Quality analysis was carried out from Indicators divided into 3 sectors: Regulation and Management; Equipment; Image Quality and Dosimetry. Values were assigned for each indicator according to the degree of compliance with the specifications, and were used to calculate the Index. The model was applied in 110 institutions of the State of Rio de Janeiro, and the results were distributed into 5 ranges of values. About 40% of the institutions received grades belonging to the two highest ranges of values. There was no significant difference between the results of old scanners compared to the younger ones. (author)

  10. Aspectos da tomografia computadorizada craniana na neurocisticercose na infância

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    Marilisa M. Guerreiro

    1989-06-01

    Full Text Available Os autores relatam aspectos tomográficos da neurocisticercose na infância a propósito da análise de 27 exames em 18 pacientes, que foram distribuídos em três grupos segundo o quadru clínico e os achados tomográficos. O grupo 1 foi caracterizado basicamente por epilepsias e calcificações. O grupo 2 caracterizou-se por hipertensão intracraniana e diversos aspectos tomográficos: edema, cistos e nódulos em três pacientes; hidrocefalia e calcificações em dois pacientes e normal em um paciente. O grupo 3 consistiu clinicamente de epilepsia e cefaléia, com vários padrões tomográficos. Os resultados são discutidos à luz da literatura disponível.

  11. Cerebral toxoplasmosis in AIDS - computerized tomography evaluation; Toxoplasmose cerebral na SIDA - avaliacao por tomografia computadorizada

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    Alves, Regina Coeli Fonseca [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Hospital Universitario Antonio Pedro. Servico de Radiologia; Narchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia

    1999-06-01

    Cerebral toxoplasmosis is a disease that affects many AIDS's patients. FOr this paper 46 patients with confirmed cases of cerebral toxoplasmosis who did a CT scan between March, 1994 and September, 1997 were examined. Single lesions were found in 28.3% of the patients. The lesions were more frequently detected in the basal ganglia and the frontal lobes. No lesion was larger than 4 cm. As regards the contrast enhancing of the lesions on a CT scan we observed that 54.5% of the lesions had a ring-like contrast enhancing, 36.4% had a nodular contrast enhancing and 6% had a heterogeneous form. After the 21st day of treatment we noticed an improvement in the aspect of the patients'lesions. The improvement of the lesions could be seen through a reduction of the edematous halo, a reduction of the lesion size and a modification in the contrast enhancing on the CT scan. The CT scan was an important method to demonstrate the lesions compatibility enhancing on the CT scan. The CT scan was an important method to demonstrate the lesions compatibility with cerebral toxoplasmosis, as well as to monitor these patients during treatment. (author)

  12. CT in the evaluation of severe liver trauma; Tomografia computadorizada na avaliacao do trauma hepatico grave

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    Machado, Marcel Autran C. [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina, Hospital das Clinicas; Souza Rocha, Manoel de; Machado, Manoel C.C. [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina; Macedo Neto, Augusto Cesar de; Maciel, Rosangela Pereira; Simonetti, Celso

    1995-05-01

    Abdominal CT is a common examination in the evaluation of patients with blunt abdominal trauma and clinical suspicion for solid organ injury when reasons for immediate laparotomy are not present. A case of major blunt hepatic injury in a 22-year-old patient is reported. The authors present a brief review of the literature and discussion about the role of CT scan in the evaluation of hepatic trauma, surgical planning and postoperative follow-up. (author). 15 refs., 3 figs., 1 tab.

  13. Computed tomography evaluation of mast cell tumours; Avaliacao por tomografia computadorizada dos mastocitomas

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    Lorigados, Carla Aparecida Batista; Matera, Julia Maria; Macedo, Thais; Pinto, Ana Carolina Brandao Fonseca, E-mail: clorigados@usp.br [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia

    2012-07-01

    The mast cell tumours are common tumours of the canine skin. Computed tomography (CT) has assumed an important role in tumours evaluation and staging. The aim of this study was to evaluate the role of CT as a method of assessing characteristics of mast cell tumors. Ten dogs with mast cell tumor were evaluated. CT was performed before and after the intravenous injection of hydro soluble ionic iodine. Attenuation, contrast enhancement, cleavage with adjacent tissues and the unidimensional measurement of each lesion was determined in it maximum diameter, in transversal plane. Concerning the attenuation characteristic, 50% were homogeneous and 50% heterogeneous. The contrast enhancement was homogeneous in 50% of cases, heterogeneous in 40% and peripheral in 10%. Fifty percent of the tumours showed loss of plane of cleavage and 30% partial loss. This information can help in directing the patients that will be undergoing chemotherapy or surgery. (author)

  14. Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica

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    Vilarinho, Luisa Maria Auredine Lima

    2004-07-01

    The objective of this work was the evaluation of radiation doses in paediatric computed tomography scans, considering the high doses usually involved and the absence of any previous evaluation in Brazil. Dose values were determined for skull and abdomen examinations, for different age ranges, by using the radiographic techniques routinely used in the clinical centers investigated. Measurements were done using pencil shape ionization chambers inserted in polymethylmethacrylate (PMMA) phantoms. These were compact phantoms of different diameters were specially designed and constructed for this work, which simulate different age ranges. Comparison of results with published values showed that doses were lower than the diagnostic reference levels established to adults exams by the European Commission. Nevertheless, doses in paediatric phantoms were higher than those obtained in adult phantoms. The paediatric dose values obtained in Hospitals A and B were lower than the reference level (DRL) adopted by SHIMPTON for different age ranges. In the range 0 - 0.5 year (neonatal), the values of DLP in Hospital B were 94 por cent superior to the DRL For the 10 years old children the values of CTDI{sub w} obtained were inferior in 89 por cent for skull and 83 por cent for abdomen examinations, compared to the values published by SHRIMPTON and WALL. Our measured CTDI{sub w} values were inferior to the values presented for SHRIMPTON and HUDA, for all the age ranges and types of examinations. It was observed that the normalized dose descriptors values in children in the neonatal range were always superior to the values of doses for the adult patient. In abdomen examinations, the difference was approximately 90% for the effective dose (E) and of 57%.for CTDI{sub w} . (author)

  15. {sup 99m}Tc sestamibi cardiac tomography and dobutamine echocardiography in the identification of reversible left ventricular dysfunction in patients with acute myocardial infarction; Tomografia cardiaca con {sup 99m}Tc sestamibi ed ecocardiografia con dobutamina nell'identificazione della disfunzione ventricolare sinistra reversibile nei pazienti con infarto acuto del miocardio

    Energy Technology Data Exchange (ETDEWEB)

    Gisonni, P.; Cuocolo, A.; Spinelli, L.; Acampa, W.; Florimonte, L.; Nicolai, E.; Petretta, M.; Sodano, A. [Naples Univ. Federico 2. (Italy). Centro per la Medicina Nucleare del Consiglio Nazionale delle Ricerche. Dipt. di Scienze Biomorfologiche e Funzionali

    1999-04-01

    The authors investigated the role of technetium-99m ({sup 99m}Tc) sestamibi cardiac imaging and dobutamine echocardiography in detecting myocardial viability early after acute myocardial infarction. [Italian] La presenza di tessuto miocardico ibernato o stordito contribuisce alla genesi della disfunzione ventricolare sinistra nei pazienti con infarto del miocardio. L'identificazione del miocardio malfunzionante ma ancora vitale ha particolare rilevanza nel predire il recupero della funzione ventricolare in seguito a interventi di rivascolarizzazione coronarica. In questo studio e' stato valutato il ruolo della scintigrafia con tecnezio-99m ({sup 99m}Tc) sestamibi e dell'ecocardiografia con dobutamina nell'identificazione del miocardio vitale dopo infarto acuto del miocardio.

  16. Estudo do metabolismo da glicose na tuberculose pulmonar ativa utilizando a tomografia por emissão de pósitrons (18F-FDG PET Evaluation of glucose metabolism in active lung tuberculosis by positron-emission tomography (18F-FDG PET

    Directory of Open Access Journals (Sweden)

    SIDNEY BOMBARDA

    2002-09-01

    Full Text Available Os métodos de imagem utilizados na avaliação da tuberculose pulmonar incluem a radiografia e a tomografia computadorizada do tórax. As imagens obtidas pelos métodos de medicina nuclear permitem estudos funcionais e metabólicos dos órgãos de interesse, através do uso de radiofármacos específicos. Alterações do metabolismo da glicose podem ser detectadas pela tomografia por emissão de pósitrons (PET utilizando-se o 18F-fluorodesoxiglicose (18F-FDG. Essas alterações estão presentes nas doenças neoplásicas, inflamatórias e infecciosas. A tuberculose é uma doença granulomatosa causada pelo Mycobacterium tuberculosis, que se utiliza de glicose como fonte de energia. Objetivo: O estudo do metabolismo da glicose na tuberculose pulmonar através da PET e sua comparação com a tomografia computadorizada de tórax. Material e métodos: Foram avaliados 20 pacientes portadores de tuberculose pulmonar. Todos foram submetidos à PET e à tomografia computadorizada de tórax, em até 30 dias após o início do tratamento. Resultados: Todos os pacientes apresentaram captação positiva do 18F-FDG na PET. Na tomografia computadorizada do tórax, todos os pacientes apresentaram sinais compatíveis com atividade de tuberculose. A sensibilidade dos dois métodos foi de 100%. Houve concordância entre os achados do 18F-FDG PET e da tomografia computadorizada (K = 0,27 e p Current methods to evaluate lung tuberculosis include chest radiography and computed tomography. Nuclear medicine imaging techniques are performed after administration of specific radiopharmaceuticals that accumulate in the organs of interest. Alterations of glucose metabolism can be observed by positron-emission tomography, using 18F-fluorodeoxyglucose (18F-FDG PET. These findings are present in the neoplasms, but also in inflammatory and infectious diseases. Tuberculosis is a granulomatous disease caused by Mycobacterium tuberculosis , that uses glucose as an energy source

  17. Reinforced concrete tomography; Tomografia de hormigon armado

    Energy Technology Data Exchange (ETDEWEB)

    Mariscotti, M A.J.; Morixe, M; Tarela, P A; Thieberger, P [Tomografia de Hormigon Armado S.A., Boulogne (Argentina)

    1998-12-31

    In this paper we describe the technique of reinforced concrete tomography, its historical background, recent technological developments and main applications. Gamma radiation sensitive plates are imprinted with radiation going through the concrete sample under study, and then processed to reveal the presence of reinforcement and defects in the material density. The three dimensional reconstruction, or tomography, of the reinforcement out of a single gammagraphy is an original development alternative to conventional methods. Re-bar diameters and positions may be determined with an accuracy of {+-} 1 mm 0.5-1 cm, respectively. The non-destructive character of this technique makes it particularly attractive in cases of inhabited buildings and diagnoses of balconies. (author) 8 refs., 12 figs. [Espanol] En este trabajo se describe la tecnica de tomografia de hormigon armado, sus antededentes, recientes desarrollos y aplicaciones mas importantes. Esta tecnica se basa en el uso de radiacion gamma para penetrar piezas de hormigon. Placas gammagraficas son sensibilizadas con la radiacion que atraviesa la pieza bajo estudio y luego procesadas para revelar la presencia de armadura e inhomogeneidades en la densidad del concreto. La reconstruccion tridimensional o tomografia, de la armadura a partir de una sola gammagrafia es un desarrollo original alternativo a los metodos convencionales. Diametros y posiciones de los hierros existentes en el interior de columnas, vigas y losas pueden ser determinados con precisiones de {+-} 1 mm y 0.5-1 cm, respectivamente. La condicion de no destructiva hace que esta tecnica sea particularmente apreciada en los casos de edificios habitados y sea insustituible para el diagnostico de balcones. (autor)

  18. AIDS related thoracic lymphoma: evaluation by computed tomography; Linfoma toracico na sindrome da imunodeficiencia adquirida: avaliacao por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Siciliano, Antonio Alexandre de Oliveira [Hospital Universitario Clementino Fraga Filho, Rio de Janeiro, RJ (Brazil). Servico de Radiodiagnostico; Marchiori, Edson [Universidade Federal, Rio de Janeiro, RJ (Brazil). Curso de Pos-graduacao em Radiologia

    2000-02-01

    The authors reviewed five cases of patients with acquired immunodeficiency syndrome (AIDS) related lymphoma to describe the thoracic findings on computed tomography. The patients were followed at Hospital Universitario Clementino Fraga Filho, Hospital Universitario Antonio Pedro and Hospital da Lagoa, from November, 1989 to March 1998. Epidemiological, clinical and pathological data from these patients were quiet variable and pulmonary nodules and masses, hilar and mediastinal lymphadenopathy, and thoracic wall masses were observed. AIDS related lymphomas involving the chest are pleomorphic and most commonly extranodal. (author)

  19. Wegener's granulomatosis: chest computed tomography findings; Granulomatose de Wegener: aspectos na tomografia computadorizada de torax

    Energy Technology Data Exchange (ETDEWEB)

    Monteiro, Evelise de Azevedo; Marchiori, Edson; Martins, Erick Malheiro Leoncio [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia]. E-mail: edmarchiori@zipmail.com.br; Souza Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Hospital de Base; Cerqueira, Elza Maria F.P. de [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Radiologia; Irion, Klaus L. [Pavilhao Pereira Filho, Porto Alegre, RS (Brazil); Araujo Neto, Cesar de [Bahia Univ., Salvador, BA (Brazil). Dept. de Radiologia; Souza, Rodrigo Azeredo de [Universidade Federal, Rio de Janeiro, RJ (Brazil). Faculdade de Medicina. Dept. de Radiologia

    2003-03-01

    Wegeners granulomatosis is an inflammatory systemic necrotizing idiopathic vasculitis affecting mainly small vessels. In this paper we analyzed the computed tomography findings of seven patients with Wegeners granulomatosis. The most common findings were masses and nodules (71.4%), areas of ground glass attenuation (57.1%), consolidation (42.8%), halo sign (42.8%), cavitation (42.8%), interlobular septa thickening (14.2%), bronchial wall thickening (14.2%) and pleural effusion (14.2%). Although radiological findings are mostly nonspecific, computed tomography and particularly high-resolution computed tomography are important tools in the evaluation of disease activity when evaluated in association with bronchoscopy findings and clinical data. (author)

  20. Nonoperative treatment of splenic trauma: usefulness of computed tomography; Tratamento conservador do trauma esplenico: utilidade da tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Resende, Vivian [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Faculdade de Medicina; Tavares Junior, Wilson Campos; Vieira, Jose Nelson Mendes [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Hospital das Clinicas. Dept. de Radiologia e Diagnostico por Imagem]. E-mail: wilsontavaresjrmd@yahoo.fr; Drumond, Domingos Andre Fernandes [Hospital Joao XXIII, Belo Horizonte, MG (Brazil). Setor de Clinica Cirurgica

    2005-04-15

    Objective: to report the results of use of conservative treatment in patients with splenic trauma and to emphasize the usefulness of computed tomography in these cases. Material and method: sixty-nine cases of pediatric patients with blunt abdominal trauma seen from from January 2001 to June 2004 at the level I trauma center were retrospectively studied. Forty-four of these patients were submitted to nonoperative treatment and the clinical follow-up was performed by computerized tomography. All patients had been diagnosed with splenic injury by computerized tomography.Results: the causes of the injuries were motor vehicle accident in 12 (27.2%) patients, bicycle accident in nine (20.4%) patients, and falls in 23 (52.2%) patients. Two (3.7%) patients died from associated injuries. The mean duration of hospital stay was six days. The mean age of the patients was nine years. Conclusion: conservative treatment for blunt splenic trauma is performed with the aim of reducing costs and risks for the patients, and computerized tomography should be routinely used. No posterior complications were observed in this approach. (author)

  1. Evaluation of the absorbed dose in odontological computerized tomography; Avaliacao da dose absorvida em tomografia computadorizada odontologica

    Energy Technology Data Exchange (ETDEWEB)

    Legnani, Adriano; Schelin, Hugo R.; Rocha, Anna Silvia P.S. da, E-mail: schelin@utfpr.edu.b, E-mail: anna@utfpr.edu.b [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Khoury, Helen J., E-mail: khoury@ufpe.b [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2011-10-26

    This paper evaluated the absorbed dose at the surface entry known as 'cone beam computed tomography' (CBCT) in odontological computerized tomography. Examination were simulated with CBCT for measurements of dose. A phantom were filled with water, becoming scatter object of radiation. Thermoluminescent dosemeters were positioned on points correspondent to eyes and salivary glands

  2. Evaluation of the absorbed dose in odontological computerized tomography; Avaliacao da dose absorvida em tomografia computadorizada odontologica

    Energy Technology Data Exchange (ETDEWEB)

    Legnani, Adriano; Schelin, Hugo R; Rocha, Anna Silvia P.S. da, E-mail: schelin@utfpr.edu.b, E-mail: anna@utfpr.edu.b [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Khoury, Helen J., E-mail: khoury@ufpe.b [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil)

    2011-10-26

    This paper evaluated the absorbed dose at the surface entry known as 'cone beam computed tomography' (CBCT) in odontological computerized tomography. Examination were simulated with CBCT for measurements of dose. A phantom were filled with water, becoming scatter object of radiation. Thermoluminescent dosemeters were positioned on points correspondent to eyes and salivary glands

  3. Soil structure changes evaluated with computed tomography;Mudancas na estrutura do solo avaliada com uso de tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Pires, Luiz Fernando [Universidade Estadual de Ponta Grossa (UEPG), PR (Brazil). Dept. de Fisica; Bacchi, Osny Oliveira Santos, E-mail: osny@cena.usp.b [Centro de Energia Nuclear na Agricultura (CENA/USP), Piracicaba, SP (Brazil)

    2010-04-15

    The objective of this work was to evaluate in millimetric scale changes in soil bulk density and porosity, using the gamma-ray computed tomography in soil samples with disturbed structure due to wetting and drying (W-D) cycles. Soil samples with 98.1 cm{sup 3} were sieved using a 2 mm mesh and homogeneously packed in PVC cylinders. Soil samples were submitted to 1, 2, and 3 W-D cycles. Control samples were not submitted to W-D cycles. After repetitions of W-D cycles, soil sample porosity decreased and soil layers became denser. Computed tomography allowed a continuous analysis of soil bulk density and also soil porosity along millimetric (0.08 cm) layers, what cannot be provided by traditional methods used in soil physics. (author)

  4. Dose profile in computed tomography chest scan; Perfil de dose em varredura de torax em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Bruno B., E-mail: bbo@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil). Pos-graduacao em Ciencias e Tecnologia das Radiacoes, Minerais e Materiais; Mourao, Arnaldo P. [Centro Federal de Educacao Tecnologica de Minas Gerais (CEFET/MG), Belo Horizonte, MG (Brazil); Alonso, Thessa C.; Silva, Teogenes A. da [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2010-07-01

    For the optimization of the patient dose in computed tomography (CT), the Brazilian legislation only established the diagnostic reference levels (DRL's) in terms of Multiple Scan Average Dose (MSAD) in a typical adult as a parameter of quality control of CT scanners. Conformity to the DRL's can be verified by measuring the dose distribution in CT scans and MSAD determination. An analysis of the quality of CT scans of the metropolitan region of Belo Horizonte is necessary by conducting pertinent tests to the study that are presented in the ANVISA (National Agency of Sanitary Vigilance) Guide. The purpose of this study is to investigate, in a chest scan, the variation of dose in CT. To measure the dose profile are used lithium fluoride thermoluminescent dosimeters (TLD-100 Rod) distributed in cylinders positioned in peripheral and central regions of a phantom of polymethylmethacrylate (PMMA). The data obtained allow us to observe the variation of the dose profile inside the phantom. The peripheral region shows higher dose values than the central region. The longitudinal variation can be observed and the maximum dose was recorded at the edges of the phantom (41,58{+-}5,10) mGy at the midpoint of the longitudinal axis. The results will contribute to disseminate the proper procedure and optimize the dosimetry and the tests of quality control in CT, as well as make a critical analysis of the DRL's. (author)

  5. Unilateral pulmonary veins atresia: evaluation by computed tomography; Atresia unilateral das veias pulmonares: avaliacao por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Eifer, Diego Andre; Arsego, Felipe Veras, E-mail: felipesoarestorres@gmail.com [Hospital de Clinicas de Porto Alegre (HCPA), RS (Brazil). Serv. de Radiologia; Torres, Felipe Soares [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Escola de Medicina

    2013-11-15

    Unilateral pulmonary vein atresia is a rare congenital condition. In addition to cardiac malformations or pulmonary hypertension, patients may present with recurrent pulmonary infections or hemoptysis in childhood or adolescence. The authors report a case where the typical findings of such condition were observed at computed tomography in an adult patient. (author)

  6. Pulmonary leukemic involvement: high-resolution computed tomography evaluation; Comprometimento pulmonar nas leucemias: avaliacao por tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Ana Paola de [Universidade Federal, Rio de Janeiro, RJ (Brazil). Faculdade de Medicina. Programa de Pos-graduacao em Radiologia; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Souza, Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Dept. de Radiologia

    2004-12-01

    Objective: To evaluate the role of high-resolution computed tomography (HRCT) in patients with leukemia and pulmonary symptoms, to establish the main patterns and to correlate them with the etiology. Materials and Methods: This is a retrospective study of the HRCT of 15 patients with leukemia and pulmonary symptoms. The examinations were performed using a spatial high-resolution protocol and were analyzed by two independent radiologists. Results: The main HRCT patterns found were ground-glass opacity (n=11), consolidation (n=9), airspace nodules (n=3), septal thickening (n=3), tree-in-bud pattern (n=3), and pleural effusion (n=3). Pulmonary infection was the most common finding seen in 12 patients: bacterial pneumonia (n=6), fungal infection (n = 4), pulmonary tuberculosis (n=1) and viral infection (n=1). Leukemic pleural infiltration (n=1), lymphoma (n=1) and pulmonary hemorrhage (n=1) were detected in the other three patients. Conclusion: HRCT is an important tool that may suggest the cause of lung involvement, its extension and in some cases to guide invasive procedures in patients with leukemia. (author)

  7. Deep benign fibrous histiocytoma: computed tomography and histology findings; Histiocitoma fibroso benigno profundo: achados na tomografia computadorizada e histologia

    Energy Technology Data Exchange (ETDEWEB)

    Farage, Luciano; Castro, Mario Augusto Padula; Macedo, Tulio Augusto Alves [Uberlandia Univ., MG (Brazil). Hospital das Clinicas. Setor de Radiologia; Salomao, Eliana Chaves; Machado, Tania Alcantara; Souza, Lincoln Pereira de; Freitas, Luiz de Oliveira [Uberlandia Univ., MG (Brazil). Faculdade de Medicina. Dept. de Clinica Medica

    2005-04-01

    We present the computed tomography images of an 83-year-old male patient with a deep benign fibrous histiocytoma at the lateral aspect of the left leg. Computed tomography images showed a well-defined mass with marked peripheral enhancement by iodinated contrast medium. Only few reports of this rare soft tissue tumor can be found in the literature. (author)

  8. Lipoid pneumonia: computed tomography findings - a case report; Pneumonia lipidica: aspectos na tomografia computadorizada - relato de caso

    Energy Technology Data Exchange (ETDEWEB)

    Farias, Janos; Martins, Erick Malheiro Leoncio; Pozes, Aline Serfaty; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Fialho, Suzane Mansur [Clinica Radiologica Emilio Amorim, Rio de Janeiro, RJ (Brazil)

    2004-02-01

    The authors report a case of lipoid pneumonia in an 80 year old man with chronic constipation in regular use of mineral oil as a laxative. According to his family, he experienced coughing episodes when he took his medication. He also presented dyspnoea at rest and diminished consciousness levels. Chest radiographs showed a consolidation area in the posterior segment of right upper lobe, which did not change on successive exams. High resolution computed tomography demonstrated low-density consolidation with negative Hounsfield units (-29 to -83 UH) and ground-glass opacities in the right upper lobe and inferior lobes. These opacities predominated in the posterior regions of the lungs. The diagnosis was confirmed by the presence of oil material on bronchoalveolar washing. The patient was advised to discontinue the ingestion of mineral oil and did not return for follow-up. (author)

  9. Bone densitometry in healthy cats by quantitative computed tomography; Densitometria ossea em gatos higidos por tomografia computadorizada quantitativa

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, D.C. [Universidade Federal do Parana - Curitiba, PR (Brazil); Costa, L.A.V.S.; Teixeira, M.W.; Costa, F.S. [Universidade Federal Rural de Pernambuco - Recife, PE (Brazil); Cardoso, M.J.L. [Universidade Estadual do Norte do Parana - Campus Luiz Meneghel - Bandeirantes, PR (Brazil)

    2012-06-15

    The radiodensity of the trabecular bone of the lumbar vertebrae in 16 healthy adult cats was studied using quantitative computed tomography (QCT). The average radiodensity of the trabecular bone of the second lumbar vertebra was 436.1 +- 42.1 Hounsfield units. However, there was a nonhomogeneous radiodensity distribution of the vertebral body. (author)

  10. Aspects of pulmonary emphysema on high resolution computed tomography; Aspectos do enfisema pulmonar na tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Angelo Junior, J.R.L.; Castro Lessa Angelo, M.T. de; Silva, F.M.D.; Costa, N.S.S.; Kavakama, J.; Carvalho, C.R.R.; Cerri, G.G. [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Hospital das Clinicas

    1995-03-01

    Pulmonary emphysema is an entity characterized by enlargement of the air-space with bronchiolar walls destruction with-out evident fibrosis. It is classified according to anatomic distribution of the areas of lung destruction into these types: centrilobular, panlobular, paraseptal, and paracicatricial. TCAR is superior to chest radiographs and conventional CT is detecting these areas of pulmonary destruction. (author). 10 refs, 7 figs.

  11. Cholesteatoma: computed tomography and radiography in a dog; Colesteatoma: tomografia computadorizada e radiografia em cao com otite cronica

    Energy Technology Data Exchange (ETDEWEB)

    Belotta, Alexandra Frey; Babicsak, Viviam Rocco; Mamprim, Maria Jaqueline; Vulcano, Luiz Carlos, E-mail: a_fbelotta@yahoo.com.br [Universidade Estadual Paulista Julio de Mesquita Filho (FMVZ/UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia . Dept. de Reproducao Animal e Radiologia Veterinaria; Arruda, Vanesa Kutz de; Amorim, Rogerio Martins [Universidade Estadual Paulista Julio de Mesquita Filho (FMVZ/UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Clinica Veterinaria

    2012-07-01

    Cholesteatoma, a rare and/or misdiagnosed disease, results of a serious complication in dogs with chronic otitis. This article describes a case of a dachshund sent to the veterinary hospital presenting signs of cognitive dysfunction associated to peripheral neuropathy of the facial nerve on the right side. At radiography, an enlargement and thickness of the contours associated with loss of anatomical definition of the right tympanic bulla compared to the left was seen. At tomography, this enlargement and thickness were seen with better definition, besides the fulfilling by hyperdense calcified content, bullae osteolysis and temporal bone sclerosis at the same side. (author)

  12. Progressive systemic sclerosis: high-resolution computed tomography findings; Esclerose sistemica progressiva: aspectos na tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Gasparetto, Emerson L.; Pimenta, Rodrigo; Ono, Sergio E.; Escuissato, Dante L. [Parana Univ., Curitiba, PR (Brazil). Hospital de Clinicas. Servico de Radiologia Medica]. E-mail: dante.luiz@onda.com.br; Inoue, Cesar [Parana Univ., Curitiba, PR (Brazil). Faculdade de Medicina

    2005-09-15

    Objective: To describe the high-resolution computed tomography findings in the lung of patients with systemic sclerosis, independently of the respiratory symptoms. Materials and methods: Seventy-three high-resolution computed tomography scans of 44 patients with clinical diagnosis of systemic sclerosis were reviewed and defined by the consensus of two radiologists. Results: Abnormalities were seen in 91.8% (n = 67) of the scans. The most frequent findings were reticular pattern (90.4%), ground-glass opacities (63%), traction bronchiectasis and bronchiolectasis (56.2%), esophageal dilatation (46.6%), honeycombing pattern (28.8%) and signs of pulmonary hypertension (15.6%). In most cases the lesions were bilateral (89%) and symmetrical (58.5%). The lesions were predominantly located in the basal (91.2%) and peripheral (92.2%) regions. Conclusion: In the majority of the patients, progressive systemic sclerosis can cause pulmonary fibrosis mainly characterized by reticular pattern with basal and peripheral distribution on high-resolution computed tomography. (author)

  13. Avaliação da simetria craniana através de imagens de TC cone beam = Cranial symmetry assessment through cone-beam CT images

    OpenAIRE

    Vilella, Oswaldo de Vasconcellos; Rothier, Eduardo Kant Colunga; Vilella, Beatriz de Souza

    2014-01-01

    Objetivo: O objetivo do presente estudo foi comparar os lados direito e esquerdo de indivíduos que apresentavam simetria craniana através de 2 imagens geradas pela tomografia computadorizada cone beam (TCCB). Métodos: A amostra consistiu de 35 imagens obtidas pelo tomógrafo 3D-i-CAT (Imaging Sciences International Inc. , Hatfield, USA), sendo 13 de indivíduos do gênero masculino e 22 do gênero feminino, com idades variando de 8 a 64 anos, que apresentavam simetria facial aceitável. As imagens...

  14. Aplicação de medidas cefalométricas em 3D-TC: Application of cephalometric measurements in 3D-TC

    Directory of Open Access Journals (Sweden)

    Patrícia de Medeiros Loureiro Lopes

    2007-01-01

    Full Text Available OBJETIVO: o objetivo desta pesquisa foi avaliar a precisão e acurácia (validade de medidas cefalométricas lineares em imagens reconstruídas em terceira dimensão (3D, pela técnica de volume, a partir da tomografia computadorizada (TC multislice. METODOLOGIA: o material da pesquisa consistiu de 10 (dez crânios secos, previamente selecionados, sem distinção de etnia ou gênero, os quais foram submetidos à TC multislice 16 cortes com 0,5mm de espessura por 0,3mm de intervalo de reconstrução. Posteriormente, os dados obtidos foram enviados para uma estação de trabalho independente, contendo o programa Vitrea®. Os pontos cefalométricos (n=13 foram localizados e as respectivas medidas ósseas lineares (n=15 foram realizadas por 2 examinadores, previamente treinados, medindo cada um duas vezes, independentemente, em 3D. As medidas físicas foram obtidas por um terceiro examinador, utilizando um paquímetro digital. A análise dos dados foi realizada mediante um estudo comparativo entre as medidas inter e intra-examinadores, em 3D-TC, e entre estas e as medidas físicas obtidas diretamente nos crânios, utilizando ANOVA (análise de variância. RESULTADOS: não foram encontradas diferenças estatisticamente significantes entre os valores das medidas inter e intra-examinadores, nem entre as medidas físicas e em 3D, com p>0,6 para todas as medidas. O erro percentual foi de 2,05% para as medidas interexaminadores e de 2,11% para as medidas intra-examinadores. A média do erro percentual entre as medidas físicas e em 3D variou de 0,96% a 1,47%. CONCLUSÃO: todas as medidas cefalométricas lineares foram consideradas precisas e acuradas utilizando a técnica de volume em 3D por meio da TC multislice.AIM: To test the precision and accuracy of conventional linear cephalometric measurements in 3D reconstructed images using a multislice CT. METHODS: The study population consisted of 10 dry skulls, previously selected, without distinction of

  15. Volumetria hepática computadorizada como método de avaliação e acompanhamento da regeneração hepática após hepatectomia parcial em suínos

    Directory of Open Access Journals (Sweden)

    Fábio Augusto de Carvalho

    Full Text Available OBJETIVO: O estudo analisou a volumetria hepática por tomografia axial computadorizada, através de um programa informatizado semi-automático de aquisição e processamento de imagens digitalizadas, como parâmetro de acompanhamento da regeneração hepática em suínos, após hepatectomia parcial. MÉTODO: Doze suínos fêmeas, da raça Landrace, jovens, foram distribuídos em 3 grupos, conforme tempo de observação após o procedimento cirúrgico: 5(G5, 10(10 ou 15(G15 dias. Todos foram submetidos à hepatectomia parcial e, posteriormente, após acompanhamento, sacrificados, procedendo-se a retirada do fígado regenerado. A peça da hepatectomia e o fígado regenerado foram pesados e submetidos à realização da tomografia e aferição do volume através do software HEPATO®. Para análise estatística foram utilizados os testes não-paramétricos de Kruskal-Wallis e Wilcoxon. Valores de p<0,05 indicaram significância estatística. RESULTADOS: O peso do fígado regenerado foi de: G5=434,5g, G10=449,25g e G15=486,5 g, p=0,592. A regeneração hepática a partir do peso do fígado foi de 83,58% (G5, 94,95% (G10 e 101,63% (G15, p=0,197. O volume do fígado regenerado foi de 403,58 cm² (G5, 450,88 cm² (G10 e 458,93 cm² (G15, p=0,941. A regeneração hepática a partir do volume do fígado foi de 74,25% (G5, 88% (G10 e 100% (G15, p=0,326. Não houve diferença estatística significativa entre os parâmetros. CONCLUSÃO: A avaliação volumétrica por tomografia computadorizada, utilizando um programa informatizado semi-automático de aquisição e processamento de imagens digitalizadas, é método fidedigno para avaliação e acompanhamento da regeneração hepática em suínos, após hepatectomia parcial.

  16. Evaluation of ambient radiation levels in positron emission tomography/computed tomography in microPET/CT laboratory; Avaliacao dos niveis de radiacao ambiental no laboratorio de tomografia por emissao de positrons acoplada a tomografia computadorizada, microPET/CT

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    Sarmento, Daniele Martins

    2016-11-01

    Micro PET/CT scanner is an essential tool generally used for small animal molecular imaging. Fluorine-18-labeled fluorodeoxyglucose is the most widely used radioisotope in this technique. The present study aimed to evaluate the radiation levels in a micro PET/CT research laboratory of the Radiopharmacy Center at IPEN-CNEN / SP, in order to accomplish both national standards and international recommendations. The radioprotection team has classified the laboratory as supervised area; even this laboratory does not require the adoption of specific measures for protection and safety, should be done regular re-evaluation of the conditions of occupational exposures. Workplace monitoring and individual control assessment were carried out to ensure the radiological protection of all workers directly involved in handling the scanner. Initially, there was conducted a radiometric survey, as well as measurements of the external radiation level in the workplace and its surroundings. To achieve this goal, there were placed nine thermoluminescent dosimeters of CaSO{sub 4}:Dy in preselected locations. Monthly evaluations of the occupationally exposed individuals were carried out through the use of TL dosimeters, ported in the workers' chest. Moreover, whole body measurements were performed every six months. The study period was about two-years which started in April 2014. All tests to evaluate micro PET/CT performance were based on the standard protocol of the equipment in accordance with the standard developed by the Animal PET Standard Task Force. Present study's results demonstrated that the ambient radiation levels (ambient and effective estimated radiation dose), as well as the effective shielding equipment are both adequate. This study emphasizes that it is essential to strictly follow the principles of radioprotection in workplace, whenever researches involve radioactive unsealed sources. (author)

  17. Development and application of a pediatric head phantom for dosimetry in computed tomography; Desenvolvimento e aplicacao de um simulador pediatrico craniano para dosimetria em tomografia computadorizada

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    Martins, Elaine Wirney

    2016-11-01

    To determine the exposure levels and the absorbed dose in patients undergoing CT scans, is necessary to calculate the CT dose index in measurements with a PMMA or water phantom. The phantom must be enough to simulate the attenuation and scattering characteristics of a human body or parts in a radiation field. The CT specific quantities : CT air kerma index (Ca,100) , weighted CT air kerma index (CW ), a total volume CT air kerma index (Cvol) and the CT air kerma-length product (PKL) must be determined and compared to literature reference levels. In this work a head pediatric phantom was developed, considering that the Brazilian published Diagnostic Reference Levels (DRL) are based on adult phantom measurements. This developed phantom shows a construction innovation using materials to simulate the skullcap, cortical bone (aluminum) and cancellous bone (PVC), and it was filled with distilled water. The phantom dimension follows the recommendations of the World Health Organization and the International Commission on Radiation Units for children from 0 to 5 years old head size: diameter of 160 mm and height of 155 mm. The skullcap has 4 mm of thickness and 111.9 mm of internal diameter. In order to evaluate its behavior, tests were carried out in calibration laboratories and in clinical beams. The results showed attenuation up to 23% when different materials are used as skullcap, demonstrating that the DRLs adopted could be overestimating the dose received by pediatric patients. It is observed that the dose received by CT skull scans presents different distribution, due to the skullcap partially attenuation and/or backscattering which is not considered when the PMMA phantom is used.

  18. Bronchial asthma: correlation of high resolution computerized tomography findings with clinical data; Asma bronquica: correlacao de achados em tomografia computadorizada de alta resolucao com dados clinicos

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    Mogami, Roberto [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Servico de Radiologia; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Kirk, Kennedy; Capone, Domenico [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Servico de Pneumologia; Daltro, Pedro [Instituto Fernandes Figueira, Rio de Janeiro, RJ (Brazil). Servico de Radiologia

    1999-04-01

    In this work we did a sectional study of 31 asthmatic patients with several levels of disease severity, which were submitted to high resolution computed tomography of the thorax and spirometry, between the months of July, 1995 and August, 1997. The tomographic findings were correlated with the clinical classification of the patients and the most frequent tomographic findings were bronchial wall thickening, bronchial dilatation, air trapping, centrilobular opacities, cicatricial linear shadows, mucoid impaction, emphysema and atelectasis. In asthmatic patients of long duration we observed small airway disease and irreversible lesions as the predominant findings. In smoking patients there was no high frequency of emphysema. (author)

  19. Computed tomographic study of 50 patients with hypodense hepatic injuries in childhood; Estudo de 50 casos por tomografia computadorizada de lesoes hipodensas hepaticas fundamentais na infancia

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    Pereira, Ines Minniti Rodrigues; Alvares, Beatriz Regina; Baracat, Jamal; Martins, Daniel Lahan [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Radiologia]. E-mail: iminniti@fcm.unicamp.br; Pereira, Ricardo Minniti Rodrigues [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas

    2006-03-15

    Objective: To describe the different tomographic findings in hypodense hepatic lesions in children and its differential diagnosis. Materials and methods: computed tomographic studies were obtained from 50 patients (age range: 0-16 years) with low-density liver lesions previously diagnosed by ultrasound. Images were made before and after administration of intravenous contrast medium. Image findings were analyzed and afterwards correlated with anatomopathological diagnosis. Results: forty-seven of 50 cases were confirmed, 30 by anatomopathological diagnosis. Most of then were benign lesions, hemangioma in 20%. Such lesions presented a homogeneous contrast absorption, mainly at the delayed phase, differing from malignant lesions. Metastasis was the most frequently found malignant lesion (18%). Conclusion: computed tomographic study is of great value in complementing the diagnosis of hypodense hepatic lesions in children, and must follow ultrasound diagnosis as a routine procedure. (author)

  20. Leukokoria in childhood: differential diagnosis using ultrasonography, computed tomography, and magnetic resonance imaging; Leucocoria na infancia: diagnostico diferencial por ultra-sonografia, tomografia computadorizada e ressonancia magnetica

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    Montandon Junior, Marcelo Eustaquio; Montandon, Cristiano [Colegio Brasileiro de Radiologia e Diagnostico por Imagem (CBR), Sao Paulo, SP (Brazil)]. E-mail: marmontandon@hotmail.com; Figueiredo, Sizenildo da Silva; Ribeiro, Flavia Aparecida de Souza; Nobrega, Bruno Barcelos da; Lobo, Leonardo Valadares Barbosa; Teixeira, Kim-Ir-Sen Santos [Goias Univ., Goiania (Brazil). Hospital das Clinicas. Servico de Diagnostico por Imagem e Anatomia Patologica; Jacob, Beatriz Mahmud [Goias Univ., Goiania (Brazil). Faculdade de Medicina. Radiologia e Diagnostico por Imagem

    2004-04-01

    Leukokoria is an abnormal pupillary reflex most commonly seen in children that usually results from an intra-ocular abnormality. The evaluation of a child with leukokoria should be performed particularly to rule out a retinoblastoma (the cause of leukokoria in half of the cases). The authors present the main clinical and imaging features for the diagnosis of the most common causes of leukokoria. (author)

  1. Density evaluation by computerized tomography in plain soils over different manipulation systems; Avaliacao da densidade pelo metodo da tomografia computadorizada de um planossolo sob diferentes sistemas de manejo

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    Pedrotti, Alceu [Lavras Univ., MG (Brazil). Dept. de Ciencia do Solo; Pauletto, Eloy Antonio [Pelotas Univ., RS (Brazil). Dept. de Solos; Crestana, Silvio [Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA), Sao Carlos, SP (Brazil). Centro Nacional de Pesquisa e Desenvolvimento de Instrumentacao Agropecuaria (CNPDIA)

    1996-08-01

    The objective of this paper is the evaluation of a plain soil density in different culture systems determined by X ray computerized tomography.It was observed a larger variation in densities in soils profiles analysed. The identification of layers is better utilising computerized tomography than others technic 1 fig.

  2. Pancreatite necro-hemorrágica: utilização da tomografia computadorizada como método diagnóstico auxiliar

    Directory of Open Access Journals (Sweden)

    Pedro Jorge Furtado Freitas

    2015-09-01

    Full Text Available O presente trabalho relata um caso de uma das formas mais graves de pancreatite aguda, a pancreatite necro- hemorrágica. Nessa condição, o paciente fica em uma linha tênue entre uma boa evolução e a queda do estado geral, com alta mortalidade. O paciente deu entrada no hospital com fortes dores em abdome superior. No exame tomográfico constatou-se pancreatite com sinais sugestivos de necrose, sendo tratado clinicamente por sete dias. Após manutenção radiológica do quadro, o paciente foi submetido a uma laparotomia exploradora com necrosectomia e colocação de dreno. Paciente evoluiu bem clinicamente, tendo alta hospitalar no 17º dia de internação.

  3. Computerized tomography in normal abdomen: retrospective study of renal hila angles; Tomografia computadorizada de abdome normal: estudo retrospectivo das angulacoes dos hilos renais

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    Sakate, Makoto; Sakate, Alzira Teruio Yida; Yamashita, Seizo; Teixeira, Altamir dos Santos; Correia, Luis Antonio [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Faculdade de Medicina]. E-mail: msakate@fmb.unesp.br; Barbosa, Luciano [Universidade Estadual Paulista (UNESP), Botucatu, SP (Brazil). Inst. de Biociencias

    2009-01-15

    To obtain mean angulation values for renal hila in relation to the horizontal plane traced over the right and left spinal erector muscles, considering the center of the lumbar vertebral spine as a parameter for measuring the renal hila angles. The authors have analyzed 250 abdominal computed tomography studies of both male and female healthy individuals (128 men with mean age 52.45 {+-} 17.42 years, and 122 women with mean age 54.39 {+-} 18.27 years), corresponding to 500 renal hila evaluated. The mean angulation of each hilum in relation to the horizontal plane was obtained taking acute angles into consideration. The comparative study have not found any statistically significant difference in acute angles of renal hila between male and female individuals. The statistical analysis demonstrated limits of 40.40 deg and 44.54 deg for mean right hilum angulation and 39.91 deg and 43.23 deg for mean left hilum angulation, with a confidence interval of 95% . Renal hila present similar angulation independently of sex. Higher angulation values correspond to hyper-rotation or excessive rotation, and lower angulation values, to incomplete or reverse rotation. (author)

  4. Computed tomography-guided percutaneous biopsy of pancreatic masses using pneumodissection; Biopsia percutanea de massas pancreaticas guiada por tomografia computadorizada com pneumodisseccao

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    Tyng, Chiang Jeng; Bitencourt, Almir Galvao Vieira; Almeida, Maria Fernanda Arruda; Barbosa, Paula Nicole Vieira; Martins, Eduardo Bruno Lobato; Junior, Joao Paulo Kawaoka Matushita; Chojniak, Rubens, E-mail: chiangjengtyng@gmail.com [Hospital A.C. Camargo, Sao Paulo, SP (Brazil). Dept. de Imagem; Coimbra, Felipe Jose Fernandez [Hospital A.C. Camargo, Sao Paulo, SP (Brazil). Dept. de Cirurgia Abdominal

    2013-05-15

    Objective: to describe the technique of computed tomography-guided percutaneous biopsy of pancreatic tumors with pneumodissection. Materials and methods: in the period from June 2011 to May 2012, seven computed tomography guided percutaneous biopsies of pancreatic tumors utilizing pneumodissection were performed in the authors' institution. All the procedures were performed with an automatic biopsy gun and coaxial system with Tru-core needles. The biopsy specimens were histologically assessed. Results: in all the cases the pancreatic mass could not be directly approached by computed tomography without passing through major organs and structures. The injection of air allowed the displacement of adjacent structures and creation of a safe coaxial needle pathway toward the lesion. Biopsy was successfully performed in all the cases, yielding appropriate specimens for pathological analysis. Conclusion: Pneumodissection is a safe, inexpensive and technically easy approach to perform percutaneous biopsy in selected cases where direct access to the pancreatic tumor is not feasible. (author)

  5. Squamous cell carcinoma of the external auditory canal: computed tomography findings in six cases; Carcinoma espinocelular do conduto auditivo externo: estudo por tomografia computadorizada de seis casos

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    Gonzalez, Fabio Mota; Paes Junior, Ademar Jose de Oliveira; Tornin, Olger de Souza [Complexo Hospitalar Heliopolis, Sao Paulo, SP (Brazil). Servico de Diagnostico por Imagem]. E-mail: fmg961@yahoo.com.br; Souza, Ricardo Pires de [Complexo Hospitalar Heliopolis, Sao Paulo, SP (Brazil). Programa de Residencia Medica em Radiologia e Diagnostico por Imagem

    2005-05-15

    Objective: to evaluate the role of computed tomography in the assessment of deep extension of squamous cell carcinoma of the external auditory canal. Materials and methods: in the period between May 1995 and December 2003 six patients with squamous cell carcinoma of the external auditory canal were submitted to computed tomography scan at 'Hospital Heliopolis', Sao Paulo, SP, Brazil, including axial and coronal slices with soft tissue and bone algorithms. Results: thickening of the soft tissue of the external auditory canal was seen in all patients, bone erosion and invasion of the middle ear in five (83.3%), invasion of the mastoid and parotid gland in four (66.7%), invasion of the temporomandibular joint in three (50%), and invasion of the middle cranial fossa, carotid canal and cervical lymph node enlargement in two (33.3%) patients. Conclusion: assessment of deep extension of squamous cell carcinoma of the external auditory canal using computed tomography is useful for clinical staging of the disease allowing better therapeutic planning for these patients. (author)

  6. Dose optimization in adult patients exams in a computerized tomography service; Otimizacao de dose em exames de pacientes adultos em um servico de tomografia computadorizada

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    Pimentel, Juliana; Finatto, Jerusa D.; Silva, Ana Maria Marques da, E-mail: ana.marques@pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUCRS), Porto Alegre, RS (Brazil); Froner, Ana Paula P. [CDI Tomografia e Ressonancia Magnetica, Porto Alegre, RS (Brazil)

    2013-08-15

    This paper presents a study of dose optimization in computed tomography X-ray of skull, chest and abdomen of adult patients, performed in a diagnostic imaging service in a large hospital. Images of a simulated dose phantom were acquired and the kVp, mAs, pitch, thickness and CTDI{sub vol} were collected directly from the equipment. Using the PACS system, regions of interest were delineated, where the mean and standard deviation of CT numbers for each protocol were been calculated. The optimization took into account the maintenance of the CT number and noise from images acquired with clinical protocols. It was observed that the protocols used in the service, in general, exhibit a low dose, despite the great variability among the different professional shifts. In examinations of the chest, skull and abdomen, changes in the values of mAs and pitch were suggested, allowing dose reductions (60%, 17% and 19%, respectively), without compromising the image diagnostic quality. (author)

  7. Evaluation of uniformity and noise consistency test in computerized tomography; Avaliacao do teste de constancia de uniformidade e ruido em tomografia computadorizada

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    Garrafiel, Fabricio N.; Lykawka, Rochelle; Bacelar, Alexandre; Anes, Mauricio [Hospital de Clinicas de Porto Alegre (HCPA), Porto Alegre, RS (Brazil); Alva-Sanchez, Mirko S.; Pianoschi, Thatiane [Universidade Federal de Ciencias da Saude de Porto Alegre (UFCSPA), Porto Alegre, RS (Brazil)

    2016-07-01

    The quality control in computed tomography (CT) includes constancy tests concerning CT number measured in a water tank and its response as uniformity, noise and accuracy. Differences to It's performance limits and frequency established by the national legislation and the manufacturers are well known. The objective of this study was to evaluate these tests proceeding the periodicity of national legislation. The tests were conducted over a three equipment of different manufacturers. Each equipment has acquisition parameters and specific phantoms. The equipment presented adequate performance and consistency when compared their results to the limits determined by manufacturers and national legislation. Thus, it is important to evaluate these differences and tailor the testing protocols to meet the established quality requirements. (author)

  8. Cone beam computed tomography in veterinary dentistry: description and standardization of the technique; Tomografia computadorizada de feixe conico na odontologia veterinaria: descricao e padronizacao da tecnica

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    Roza, Marcello R. [Universidade Federal de Goias (UFG), Goianai, GO (Brazil)], e-mail: marcelloroza@gmail.com; Silva, Luiz A.F.; Fioravanti, Maria C. S. [Universidade Federal de Goias (UFG), Goiania, GO (Brazil). Escola de Veterinaria. Dept. de Medicina Veterinaria; Januario, Alessandro L. [International Team for Implantology (ITI), Sao Paulo, SP (Brazil); Barriviera, Mauricio [Universidade Catolica de Brasilia (UCB), DF (Brazil). Faculdade de Odontologia. Dept. de Radiologia; Oliveira, Alexandre C.A. [Faculdade de Odontologia Sao Leopoldo Mandic, Campinas, SP (Brazil)

    2009-08-15

    Eleven dogs and four cats with buccodental alterations, treated in the Centro Veterinario do Gama, in Brasilia, DF, Brazil, were submitted to cone beam computed tomography. The exams were carried out in a i-CAT tomograph, using for image acquisition six centimeters height, 40 seconds time, 0.2 voxel, 120 kilovolts and 46.72 milli amperes per second. The ideal positioning of the animal for the exam was also determined in this study and it proved to be fundamental for successful examination, which required a simple and safe anesthetic protocol due to the relatively short period of time necessary to obtain the images. Several alterations and diseases were identified with accurate imaging, demonstrating that cone beam computed tomography is a safe, accessible and feasible imaging method which could be included in the small animal dentistry routine diagnosis. (author)

  9. Computed tomography findings in patients less than 20 years old with lymphoma; Aspectos da tomografia computadorizada no linfoma em pacientes abaixo de 20 anos de idade

    Energy Technology Data Exchange (ETDEWEB)

    Borba, Adriana Moreira Viana [Pontificia Universidade Catolica do Rio de Janeiro (PUC-RJ), Rio de Janeiro, RJ (Brazil). Escola de Medicina; Monteiro, Alexandra Maria Vieira; Lucena, Stella Beatriz Goncalves de [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Faculdade de Ciencias Medicas; Lima, Claudio Marcio Amaral de Oliveira; Ribeiro, Erica Barreiros [Hospital Naval Marcilio Dias, Rio de Janeiro, RJ (Brazil)]. E-mail: cmaol@br.inter.net; Skinner, Luis Flavio [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Faculdade de Ciencias Medicas. Hospital Universitario Pedro Ernesto (HUPE)

    2007-03-15

    Objective: To describe the general findings of lymphoma and their histological patterns in patients less than 20 years old. Materials And Methods: Twenty-two cases (16 male and 6 female, mean age 11.5 years) from the digital archive of computed tomography at the Cancer Control Center of Hospital Universitario Pedro Ernesto - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil, were retrospectively analyzed in the period between March 2003 and July 2005. Of these 22 cases, 12 were Hodgkin's and 10 were non-Hodgkin's. Results: Overall, mediastinal lymphadenomegaly was the most frequent finding (59%), with predominance in the Hodgkin's subgroup (75%), followed by hepatosplenomegaly (50%) and cervical and retroperitoneal lymphadenomegaly (27.3%). The Hodgkin's subgroup presented a prevalence of lymphadenopathy, in many lymph node chains, followed by hepatosplenomegaly (50%). One case was found with unilateral tonsillar mass, pulmonary ground-glass opacities, and renal nodules. In the non-Hodgkin's subgroup, the disease was predominantly extranodal, characterized by hepatosplenomegaly (50%), thickening of the intestinal wall (40%), pleural effusion (30%), pulmonary nodule (20%), ascites (10%), pericardial effusion (10%) and mixed bone lesions (10%). Conclusion: Computed tomography is an extremely useful method for detection, staging and follow-up of lymphomas, with alert findings like mediastinal lymphadenopathy, hepatosplenomegaly, unilateral tonsillar mass and thickening of intestinal wall. (author)

  10. Paracoccidioidomycosis: high-resolution computed tomography - anatomo-pathological correlation; Paracoccidioidomicose: correlacao da tomografia computadorizada de alta resolucao com a anatomopatologia

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    Marchiori, Edson; Muniz, Maria Angelica Soares; Santos, Maria Lucia de Oliveira [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Radiologia; Moraes, Heleno Pinto de [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. de Patologia; Capone, Domenico [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Inst. de Pneumologia

    2000-12-01

    We reviewed the high-resolution computed tomography scans of 13 patients with paracoccidioidomycosis and correlated the findings with the anatomo-pathological findings of 5 patients. The most frequent findings observed were thickening of the interlobular septa, emphysema, ground glass areas, thickening of bronchial walls, tracheal dilatation, nodules, cavities and evidence of fibrosing disease such as architectural distortion, parenchymatous bands, spicular pleural thickening, intralobular reticulate and thickening with distortion off the axial interstitium. (author)

  11. Typical and atypical presentations of paranasal sinus mucocele at computed tomography; Apresentacoes tipicas de mucocele dos seios paranasais na tomografia computadorizada

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    Carvalho, Bruna Vilaca de; Lopes, Izabella de Campos Carvalho; Correa, James de Brito, E-mail: brunavilaca@gmail.com [Hospital Mater Dei, Belo Horizonte, MG (Brazil). Dept. de Radiologia e Diagnostico por Imagem; Ramos, Laura Filgueiras Mourao; Motta, Emilia Guerra Pinto Coelho; Diniz, Renata Lopes Furletti Caldeira [Hospital Mater Dei, Belo Horizonte, MG (Brazil)

    2013-11-15

    Mucoceles are cystic masses that generally affect the sinuses. It occurs as a result from obstruction of the ostium of a sinus and consequential accumulation of mucus. Frontal and ethmoid sinuses are mostly affected. Usually, the clinical symptoms are insidious, varying with the extent of the affected region. The treatment is surgical and endoscopic surgery is the method of choice in most cases. The present study is aimed at describing the main characteristics of paranasal sinuses mucoceles, demonstrating and illustrating a series of atypical presentations with emphasis on imaging findings. (author)

  12. CT imaging in the surgical treatment of one-sided extraarticular temporomandibular joint ankylosis; Uso da tomografia computadorizada no planejamento cirurgico da anquilose temporomandibular extra-articular unilateral

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    Villamizar, Lenin A.; Ghirelli, Carolina de Oliveira; Baroni, Carina Outi; Ferro, Daniel; Pinto, Ana Carolina Brandao de Campos Fonseca, E-mail: carinaouti@yahoo.com.br [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia

    2012-07-01

    Temporomandibular joint (TMJ) ankylosis is characterized by difficulty to open the mouth. The ankylosis may be articular when TJM is involved and extra-articular when other factors lead to a restriction of chewing movements without TJM involvement. Case report of one patient with unilateral ankylosis and his surgical planning through the tomography imaging. CT imaging helps preoperative planning because it can locate the exact point of injury and can make the difference between the true and false ankylosis of the TJM. (author)

  13. Radiographic and tomographic study of the elbow joint in dogs; Avaliacao morfologica e morfometrica da articulacao umerorradioulnar em caes atraves de exames radiograficos e por tomografia computadorizada

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    Sendyk-Grunkraut, Alessandra; Martin, Claudia M.; Souza, Alexandre N.A.; Patricio, Geni Cristina F.; Lorigados, Carla A.B.; Matera, Julia M.; Fonseca-Pinto, Ana C.B.C., E-mail: anacarol@usp.br [Universidade de Sao Paulo (FMVZ/USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia

    2017-02-15

    Elbow dysplasia disease includes an united anconeal process, fragmented medial coronoid process, osteochondrosis of humeral trochlea, articular incongruity and degenerative joint disease. The aim of this study was to present detailed morphologic and morphometric aspects of the elbow joint in dog in clinical and correlate with radiographic and tomographic (CT) exam. Inter-observer variation for articular incongruity measurements by CT, comparative analysis in the radiographic exam, angle in ulnar notch and its comparative analysis between radiographic and tomographic agreement examination in 44 elbow of dogs with different ages were evaluated. The statistics analyses included the kappa coefficient and interclass correlation and Fischer's test and McNemar's test. It was evidenced that individual performance of each radiographic incidence had poor agreement with the tomographic exam, suggesting that the accomplishment of more than two radiograph views are needed. There was no agreement between the three evaluators in the ulnar notch angle at radiographic and tomographic exams. However, there was good/moderate agreement for articular incongruity measurement in the sagittal plane between evaluators. It was possible to conclude that none of the five radiographic incidences was better than the others for radiographic analysis because each incidence had a better identification of a particular elbow compartment; measurements at the tomographic exam to evaluate radioulnar incongruity had no reproductiveness in the frontal plane, but in sagittal plan had a good/moderate agreement between observers and the angle in ulnar notch presented no repeatability at radiographic exam and no reproductiveness at tomographic exam. (author)

  14. Interstitial pulmonary alterations in visceral leishmaniasis: evaluation with high-resolution computed tomography; Alteracoes pulmonares intersticiais na leishmaniose visceral: avaliacao pela tomografia computadorizada de alta resolucao

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    Costa, Norma Selma Santos; Cerri, Giovanni Guido [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Dept. de Radiologia

    1999-08-01

    Visceral leishmaniasis, also called kala-azar, is a disease caused by a protozoan, the Leishmania donovani chagasi, that comprises reticuloendothelial system with involvement of the liver, spleen and bone marrow. It is endemic in some areas of northeastern Brazil and other countries of Latin America and Africa. The pathogenesis is related to the immunologic system of patients that present with the inability to activate the phagocytosis of the macrophages. As occurs in the liver and kidneys, the lungs are also involved with interstitial abnormalities caused by Leishmania that are not dependent upon the presence of the parasite. The histopathologic changes described are the involvement of inter alveolar septal in three different phases, irregularly and diffusely throughout the whole pulmonary parenchyma. This work analyzed high-resolution computed tomography (HRCT) of the thorax in 17 patients with visceral leishmaniasis in order to detect and characterize the abnormalities described in the anatomo pathologic findings reported in the literature. The HRCT is being used to evaluate chronic interstitial lung disease in a good correlation with histologic findings. The most common findings detected by HRCT were the reticular opacities that include peribronchovascular interstitial thickening and interlobular septal thickening an ground-glass opacity. The HRCT suggests that similar changes to that found in alveolar structures may occur in the secondary pulmonary lobule and that the involvement in the parenchymal interstitium represents the findings reported by pathological studies in visceral leishmaniasis. (author)

  15. Computed tomography of the adrenals in patients with tuberculosis; Emprego da tomografia computadorizada na deteccao de alteracoes das adrenais em doentes com tuberculose

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    Yamashita, Seizo; Machado, Jussara Marcondes; Morceli, Jose [UNESP, Botucatu, SP (Brazil). Faculdade de Medicina. Dept. de Doencas Tropicais e Diagnostico por Imagem]. E-mail: seizo_eid@uol.com.br

    2004-06-01

    We evaluated the adrenals of individuals without tuberculosis (group 1 - G1) and with tuberculosis (group 2 - G2) using computed tomography. The antero-posterior length, the thickness, and the longitudinal length of the adrenals were compared in G1 and G2. The duration of the disease, the occurrence of morphologic abnormalities in G2, the distribution according to sex, age and skin color were also studied. There was difference in the antero-posterior length and thickness of right adrenal between G1 and G2. A higher prevalence of white skin male individuals was observed in G2. There was no association between duration of the disease and the occurrence of morphologic abnormalities in G2. A higher occurrence of adrenal enlargement was observed in G2. The main computed tomography findings in patients with tuberculosis were enlargement of the adrenal without calcification, enlargement of the adrenal with punctiform calcifications, and residual calcification of the adrenal. (author)

  16. Diagnosis of hepatic steatosis by contrast-enhanced abdominal computed tomography; Diagnostico da esteatose hepatica pela tomografia computadorizada de abdome com meio de contraste intravenoso

    Energy Technology Data Exchange (ETDEWEB)

    Monjardim, Rodrigo da Fonseca; Costa, Danilo Manuel Cerqueira; Romano, Ricardo Francisco Tavares; Salvadori, Priscila Silveira; Santos, Jaime de Vargas Conde dos; Atzingen, Augusto Castelli Von; Shigueoka, David Carlos; D' Ippolito, Giuseppe, E-mail: giuseppe_dr@uol.com.br [Universidade Federal de Sao Paulo (EPM/UNIFESP), SP (Brazil). Escola Paulista de Medicina. Dept. de Diagnostico por Imagem

    2013-05-15

    Objective: to evaluate the diagnostic capacity of abdominal computed tomography in the assessment of hepatic steatosis using the portal phase with a simplified calculation method as compared with the non-contrast-enhanced phase. Materials and methods: in the present study, 150 patients were retrospectively evaluated by means of non-contrast-enhanced and contrast-enhanced computed tomography. One hundred patients had hepatic steatosis and 50 were control subjects. For the diagnosis of hepatic steatosis in the portal phase, the authors considered a result of < 104 HU calculated by the formula [L - 0.3 Multiplication-Sign (0.75 Multiplication-Sign P + 0.25 Multiplication-Sign A)] / 0.7, where L, P and A represent the attenuation of the liver, of the main portal vein and abdominal aorta, respectively. Sensitivity, specificity, positive and negative predictive values were calculated, using non-contrast-enhanced computed tomography as the reference standard. Results: the simplified calculation method with portal phase for the diagnosis of hepatic steatosis showed 100% sensitivity, 36% specificity, negative predictive value of 100% and positive predictive value of 75.8%. The rate of false positive results was 64%. False negative results were not observed. Conclusion: The portal phase presents an excellent sensitivity in the diagnosis of hepatic steatosis, as compared with the non-contrast-enhanced phase of abdominal computed tomography. However, the method has low specificity. (author)

  17. Segmentação das áreas isquêmicas no acidente vascular cerebral utilizando imagens de tomografia computadorizada de perfusão

    OpenAIRE

    Lilian Contin

    2011-01-01

    As técnicas de processamento digital de imagens têm sido vastamente aplicadas às imagens médicas. Um dos benefícios ocasionado por estas ferramentas é o de prover medidas de parâmetros que são difíceis de estimar e suscetíveis a viés do médico. O presente trabalho teve por objetivo desenvolver um software semi-automático de segmentação das áreas isquêmicas, core e penumbra, no acidente vascular cerebral, utilizando técnicas de segmentação por limiarização e baseada em regiões. Os dois algorit...

  18. Dosimetry for computed tomography using Fricke gel dosimetry and magnetic resonance imaging; Dosimetria em tomografia computadorizada empregando dosimetro Fricke gel e a tecnica de imageamento por ressonancia magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Capeleti, Felipe Favaro; Campos, Leticia L., E-mail: felipe@gmpbrasil.com.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2014-04-15

    In this work it was determined a new method for the determination of absorbed doses in Computed Tomography (CT) examinations using Fricke gel dosimetry developed at IPEN. Absorbed doses were determined by different methods of analysis, such as optical absorption spectrometry, ionization chambers and magnetic resonance imaging. Lower limit of sensitivity of the Fricke gel solution, the solution repeatability signal Fricke gel and CT equipment, detection sensitivity, among other tests were performed. Different equipment of computed tomography with multiple detectors were used. The Fricke gel solution showed better repeatability than ±5.5% using the technique of optical absorption spectrophotometry and computed tomography equipment showed repeatability better than ±0.2%. The Fricke gel solution features an easy and relatively quick preparation, but it is necessary to be careful not to contaminate and lose the solution. With the results, it was confirmed the application of this type of dosimetry for computed tomography equipment. (author)

  19. Local behavior and lymph node metastases of Wilms' tumor: accuracy of computed tomography; Comportamento local e metastases linfonodais do tumor de Wilms: acuracia da tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Eduardo Just da Costa e, E-mail: eduardojust@oi.com.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil); Instituto Materno Infantil de Pernambuco (IMIP), Recife, PE (Brazil); Silva, Giselia Alves Pontes da [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. Maternal Infantil

    2014-01-15

    Objective: to evaluate the accuracy of computed tomography for local and lymph node staging of Wilms' tumor. Materials and methods: each case of Wilms' tumor was evaluated for the presence of abdominal lymph nodes by a radiologist. Signs of capsule and adjacent organ invasion were analyzed. Surgical and histopathological results were taken as the gold standard. Results: sensitivity was 100% for both mesenteric and retroperitoneal lymph nodes detection, and specificity was, respectively, 12% and 33%, with positive predictive value of 8% and 11% and negative predictive value of 100%. Signs of capsular invasion presented sensitivity of 87%, specificity of 77%, positive predictive value of 63% and negative predictive value of 93%. Signs of adjacent organ invasion presented sensitivity of 100%, specificity of 78%, positive predictive value of 37% and negative predictive value of 100%. Conclusion: computed tomography tumor showed low specificity and low positive predictive value in the detection of lymph node dissemination. The absence of detectable lymph nodes makes their presence unlikely, and likewise regarding the evaluation of local behavior of tumors. (author)

  20. Computed tomography evaluation of autogenous graft in sinus lift surgery; Analise por tomografia computadorizada do enxerto autogeno na cirurgia de 'sinus lift'

    Energy Technology Data Exchange (ETDEWEB)

    Ajzen, Sergio Aron; Moscatiello, Rafael Andrade; Lima, Aida Maria Custodio de; Moscatiello, Vitoria Aparecida Muglia; Helio Kiitiro Yamashita [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Dept. de Diagnostico por Imagem; Mosacatiello, Rafael Muglia; Nishiguchi, Celso Itiro [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Disciplina de Tecnica Operatoria e Cirurgia Experimental; Alves, Maria Teresa de Seixas [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Disciplina de Anatomia Patologica

    2001-02-01

    The objective was to quantify bone formation within autogenous bone grafts and autogenous bone grafts in combination with platelet-rich plasma obtained either from apheresis or centrifugation using computed tomography. This prospective, double-blind study was conducted in 34 male and female adult patients (mean age of 28 years and 8 months), with either unilateral or bilateral pneumatization of the maxillary sinuses, requiring bone graft for dental implant. All patients were submitted to computed tomography examinations prior and six months after sinus lift surgery. Fifty-three maxillary sinuses were operated and divided into three distinct groups: autogenous bone graft, autogenous bone graft in combination with platelet-rich plasma obtained by centrifugation, and autogenous bone graft in combination with platelet-rich plasma obtained by apheresis. The results showed that computed tomography demonstrated bone growth in height and width between the initial and the follow-up computed tomography scans in all three groups. However, no statistical difference was found either for bone height or width. It was concluded that clinical evidence demonstrates the effectiveness of autogenous bone grafts, particularly when used in combination with bone growth factors such as platelet-rich plasma, which allow prosthetic and functional restoration of maxillofacial structures through fixation of dental implants. (author)

  1. Clinical manifestations in patients with computerized tomography diagnosis of neurocysticercosis; Manifestacoes clinicas de pacientes com diagnostico de neurocisticercose por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Pfuetzenreiter, Marcia Regina [Universidade do Estado de Santa Catarina (UDESC), Florianopolis, SC (Brazil). Dept. de Medicina Veterinaria Preventiva e Tecnologia]. E-mail: a2mrp@cav.udesc.br; Avila-Pires, Fernando Dias de [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Saude Publica

    1999-09-01

    A survey was conducted in the urban area of Lages using patients who had been submitted to a computed tomography of the skull in the period of March-December, 1996, for different reasons. Forty-two patients with a provisional diagnosis of neurocysticercosis, and 57 negatives were personally interviewed by one of the authors (Pfuetzenreiter), using a semi-structured procedure. More individuals with a provisional diagnostic of neurocysticercosis reported clinical manifestations related to this infection than those found negative. this difference is more marked among women, except in relation to convulsions, more frequently reported by men (19.05%) than by women (7.14%). The greater percentage of inactive forms (83.33%0 and a longer history of perceived symptoms among those positives suggest that the condition is not new. (author)

  2. Bosniak classification of renal cystic lesions according to multidetector computed tomography findings; Classificacao de Bosniak das lesoes cisticas renais segundo achados na tomografia computadorizada multidetectores

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, Christiana Maia Nobre Rocha de; Padilha, Igor Gomes; Farias, Lucas de Padua Gomes de; Rocha, Milzi Sarmento da, E-mail: maiachristiana@globo.com [Universidade Federal de Alagoas (UFAL), Maceio, AL (Brazil); Maranhao, Carol Pontes de Miranda; Santos, Carla Jotta Justo dos [Clinica de Medicina Nuclear e Radiologia de Maceio (MedRadiUS), Maceio, AL (Brazil)

    2014-03-15

    Renal cystic lesions are usually diagnosed in the radiologists' practice and therefore their characterization is crucial to determine the clinical approach to be adopted and prognosis. The Bosniak classification based on computed tomography findings has allowed for standardization and categorization of lesions in increasing order of malignancy (I, II, IIF, III and IV) in a simple and accurate way. The present iconographic essay developed with multidetector computed tomography images of selected cases from the archives of the authors' institution, is aimed at describing imaging findings that can help in the diagnosis of renal cysts. (author)

  3. Quantitative computed tomography as a test of endurance for evaluation of bony plates; Utilizacao da tomografia computadorizada quantitativa como teste de resistencia para avaliacao de placas osseas

    Energy Technology Data Exchange (ETDEWEB)

    Melo Filho, E.V.; Costa, L.A.V.S.; Oliveira, D.C. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil); Freitas, P.M.C. [Escola de Veterinaria - Universidade Federal de Minas Gerais - Belo Horizonte, MG (Brazil); Teixeira, M.W.; Costa, F.S. [Universidade Federal Rural de Pernambuco - Recife, PE (Brazil)

    2012-06-15

    Quantitative computed tomography was used to determine the radiodensity of bony plates. The CT scans provided information regarding radiodensity of bony plates and allowed to verify the uniformity of bone mineral density in their scope. The proposed methodology should be considered as another tool for determining the resistance of these biomaterials. (author)

  4. Computed tomography with thermal neutrons and gaseous position sensitive detector; Tomografia computadorizada com neutrons termicos e detetor a gas sensivel a posicao

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Maria Ines Silvani

    2001-12-01

    A third generation tomographic system using a parallel thermal neutron beam and gaseous position sensitive detector has been developed along three discrete phases. At the first one, X-ray tomographic images of several objects, using a position sensitive detector designed and constructed for this purpose have been obtained. The second phase involved the conversion of that detector for thermal neutron detection, by using materials capable to convert neutrons into detectable charged particles, testing afterwards its performance in a tomographic system by evaluation the quality of the image arising from several test-objects containing materials applicable in the engineering field. High enriched {sup 3} He, replacing the argon-methane otherwise used as filling gas for the X-ray detection, as well as, a gadolinium foil, have been utilized as converters. Besides the pure enriched {sup 3} He, its mixture with argon-methane and later on with propane, have been also tested, in order to evaluate the detector efficiency and resolution. After each gas change, the overall performance of the tomographic system using the modified detector, has been analyzed through measurements of the related parameters. This was done by analyzing the images produced by test-objects containing several materials having well known attenuation coefficients for both thermal neutrons and X-rays. In order to compare the performance of the position sensitive detector as modified to detect thermal neutrons, with that of a conventional BF{sub 3} detector, additional tomographs have been conducted using the last one. The results have been compared in terms of advantages, handicaps and complementary aspects for different kinds of radiation and materials. (author)

  5. Multislice helical computed tomography in the evaluation of lumbar spine diseases; Tomografia computadorizada 'multislice' no diagnostico das afeccoes da coluna lombar

    Energy Technology Data Exchange (ETDEWEB)

    Rosemberg, Laercio Alberto; Rios, Adriana Martins; Almeida, Milena Oliveira [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil)]. E-mail: laercio@einstein.br; Garbaccio, Viviane Ladeira; Kim, Nelson Ji Tae; Daniel, Mauro Miguel; Funari, Marcelo Buarque de Gusmao [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil). Dept. de Imagem

    2003-06-01

    Multislice computed tomography has advantages in comparison to conventional computer tomography such as reduction in study time, lower radiation dose, fewer metal artifacts and high quality multiplanar reformatting and three-dimensional reconstructions. We reviewed approximately 300 lumbar spine examinations and selected the most illustrative cases including congenital anomalies, degenerative lesions, spinal infections, neoplasms traumatic injuries, spondylolysis and postoperative changes. In the majority of the cases the high quality multiplanar reformatted and volume reconstructions of multislice computed tomography allowed better evaluation of the lesions, particularly in the cases of complex anatomy (author)

  6. Experimental study of mechanisms of sand production using X-ray computerized tomography; Estudo experimental dos mecanismos da producao de areia empregando tomografia computadorizada de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Janaina B.; Vargas Junior, Euripedes [Pontificia Univ. Catolica do Rio de Janeiro (PUC-Rio), RJ (Brazil). Dept. de Engenharia Civil; Barroso, Emilio V. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Dept. de Geologia; Campos, Elisabete; Goncalves, Clemente; Tavares, Andre [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2004-07-01

    During productive phase of the well, many times there is simultaneous production of the solid particles detached from matrix of the reservoir rock. This phenomenon receives the name of the sand production. In this case stress and flow conditions around of the well are fundamental factors for deflagration of the process. Stress concentration in the wall of the well lead to the loss of cohesion between grains arising, consequently, a granular material region susceptible for dragging by seepage forces derived from fluid flow. The objective of this work was to perform sand production tests in Rio Bonito and synthetic sandstone samples using real-time X-Ray Computerized Tomography. The tests investigated the initial and the evolution of failure at the cavity wall of samples. These are initial stages of the sand production process. The analysis of the CT-scans obtained during tests allowed the visualization of breakouts and collapses of the wells. From studies more details were possible estimate the sand production and produce 3-D images of the propagation of the failure. (author)

  7. Pulmonary malaria: high-resolution computed tomography findings - a case report; Malaria pulmonar: aspectos na tomografia computadorizada de alta resolucao - relato de caso

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Rosana; Souza, Daniel Andrade Tinoco de [Universidade Federal, Rio de Janeiro, RJ (Brazil). Hospital Universitario Clementino Fraga Filho. Servico de Radiodiagnostico; Hospital Copa D' Or, Rio de Janeiro, RJ (Brazil); Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia]. E-mail: edmarchiori@bol.com.br

    2004-04-01

    We report the case of a 38-year-old man with pulmonary malaria. High-resolution computed tomography showed thickening of the peribronchovascular interstitium and interlobular septa, areas of consolidation and ground glass attenuation and bilateral pleural effusion suggesting pulmonary edema. The patient recovered well after receiving specific treatment and was discharged after 11 days of hospitalization. (author)

  8. Computed tomography of mast cell tumors in dogs: assessment before and after chemotherapy; Tomografia computadorizada de mastocitomas em caes: avaliacao pre e pos-tratamento quimioterapico

    Energy Technology Data Exchange (ETDEWEB)

    Lorigados, Carla A.B.; Matera, Julia Maria; Pinto, Ana Carolina B.C.F.; Macedo, Thais R., E-mail: clorigados@usp.br [Universidade de Sao Paulo (FMVZ/USP), SP (Brazil). Fac. de Medicina Veterinaria e Zootecnia. Dept. de Cirurgia; Coppi, Antonio A.; Ladd, Fernando V.L. [Universidade de Sao Paulo (LSSCA/USP), SP (Brazil). Fac. de Medicina Veterinaria e Zootecnia. Lab. de Estereologia Estocastica e Anatomia Quimica; Souza, Vanessa A.F. de [Faculdades Metropolitanas Unidas (FMU), Sao Paulo, SP (Brazil). Curso de Medicina Veterinaria

    2013-11-15

    Nineteen dogs with mast cell tumors treated with chemotherapy were evaluated by computed tomography (CT). Were evaluated aspects related to contours, attenuation, postcontrast enhancement and presence of cleavage with adjacent structures. The RECIST criteria and volumetric measurement of lesions were performed to assess the response to treatment. The mast cell tumors presented a homogeneous or heterogeneous attenuation, presented more frequently a well delineated and regular contours and moderate enhancement after intravenous administration of the iodinated contrast media. The methods RECIST and volumetric measurements showed an excellent agreement to the classification of therapeutic response, providing a good parameter of the response to treatment. The CT examination proved to be useful in the delimitation of the tumor and an important tool for planning of surgical margins. (author)

  9. Pediatric computed tomography dose of head and chest exams: a bibliography revision; Dose em exames de cranio e torax de tomografia computadorizada pediatrica: uma revisao bibliografica

    Energy Technology Data Exchange (ETDEWEB)

    Friedrich, Barbara Q.; Capaverde, Alexandre S.; Vanni, Stefania; Mazzola, Carolina F.S.; Silva, Ana M. Marques da, E-mail: barbara.friedrich@acad.pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil)

    2015-08-15

    The Computed Tomography (CT) imaging diagnosis it is responsible for over 34% of the radiation dose given to society, only in Brazil there is around 3833 CT equipment. There are two dose index in CT, the CTDI{sub vol} and DLP that represents the Computed Tomography dose index and the product of the CTDI{sub vol} by the length of irradiation. This paper has as objective describe the values of CTDI{sub vol} e DLP for pediatric exams of chest and head. This is an exploratory study of bibliography revision on the PubMed data base using the index terms with the following crossing: Computed Tomography AND Reference Levels AND Dose. The search was limited by published studies on the last 5 years with patients among 0 and 15 years, in English or Portuguese. Besides that, were included references guides suggest by scientific and governmental organizations on the last 5 years. The data analysis was made using the four readings of Gil: exploratory, selective, analytic and interpretative. By the Exploratory Reading were located 23 articles. On the Selective Reading were excluded 4 articles and on the Analytic Reading 9 articles. The Interpretative Reading was made using 7 publications. Regarding the references guides were includes 3 guides. The Portaria MS453/98 was included for being the only national publication. All data were characterized between practical levels and reference levels. The conclusion is that there is no consensus between the reference levels for the selected articles, for pediatric exams. Besides that, the national legislation do not have reference levels for pediatric CT. (author)

  10. Multidetector-row helical computed tomography in the evaluation of cervical spine disorders; Tomografia computadorizada multislice no diagnostico das afeccoes da coluna cervical

    Energy Technology Data Exchange (ETDEWEB)

    Rosemberg, Laercio Alberto; Almeida, Milena Oliveira; Rios, Adriana Martins; Garbaccio, Viviane Ladeira; Kim, Nelson Ji Tae; Daniel, Mauro Miguel; Funari, Marcelo Buarque de Gusmao [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil). Dept. de Imagem]. E-mail: laercio@einstein.br

    2003-07-01

    Multidetector-row computed tomography (MRCT) has advantages in comparison to conventional helical computed tomography, such as reduction of study time, lower radiation doses, fewer metallic artifacts and high quality multiplanar reformatting and three dimensional reconstructions. We reviewed 150 cervical spine examinations and selected the most illustrative cases including congenital anomalies, degenerative lesions, spinal infections, neoplasms, traumatic injuries and postoperative abnormalities. The quality of multiplanar reformatting and volume reconstructions of the MRCT made the detection and evaluation of most of cases with complex anatomy easier and more precise. (author)

  11. Idiopathic pulmonary fibrosis and collagen vascular diseases - high resolution CT findings; Pneumopatias intersticiais difusas idiopaticas e associadas a colagenoses - aspectos da tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira Neto, Armando Leao; Mogami, Roberto [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Centro Biomedico. Inst. de Radiologia; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Inst. Biomedico. Dept. de Radiologia; Capone, Domenico [Universidade Estadual, Rio de Janeiro, RJ (Brazil). Dept. de Penumologia

    1996-09-01

    The aspects of the thorax high-resolution computed tomography of 15 patients with idiopathic pulmonary fibrosis and 11 patients with collagen vascular diseases are described and characterized mainly by the presence of reticular lesions with little cysts predominantly in the periphery and lower lobes. They may be associated with ground-glass lesions that, as usual, means areas of alveolitis. (author) 31 refs., 5 figs.

  12. Diffuse lung neoplasms. Correlation between high resolution computerized tomography and anatomopathology; Neoplasias pulmonares difusas: correlacao da tomografia computadorizada de alta resolucao com a anatomopatologia

    Energy Technology Data Exchange (ETDEWEB)

    Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Irion, Klaus L. [Complexo Hospitalar Santa Casa de Porto Alegre, RS (Brazil). Servico de Radiologia do Pavilhao Pereira Filho; Souza Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto, SP (Brazil)]. E-mail: edmarchiori@zipmail.com.br

    2002-08-01

    A short comparative evaluation study between high resolution computerized tomography and anatomopathologic findings is presented. The association of these two diagnostic techniques is discussed as a factor to enhance the accuracy of diffuse lung diseases, such as carcinomatous lymphangitis, Kaposi's Sarcoma, lymphomas, hematogenic metastases, bronchiole-alveolar carcinoma and leukemia. (MAC)

  13. Computed tomography of the dog's brain: normal aspects and anatomical correlation; Tomografia computadorizada do encefalo do cao: aspectos da normalidade e correlacao anatomica

    Energy Technology Data Exchange (ETDEWEB)

    Lorigados, C.A.B., E-mail: clorigados@usp.br [Faculdades Metropolitanas Unidas (UniFMU), Sao Paulo, SP (Brazil); Pinto, A.C.B.F. [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia

    2013-06-15

    Normal tomographic images of dog's heads were obtained, aimed to familiarize them with the normal aspects of the brain and correlate these findings with the relevant anatomy of the region studied. Several anatomical structures, such as the parenchyma of the frontal, parietal, temporal and occipital lobes, the longitudinal fissure, the ventricular system, the cerebellum, the olfactory bulb, the corpus callosum, diencephalon, the pons, the medulla oblongata and the chiasmatic sulcus were directly identified or were related to neighboring structures which helped in their identification. (author)

  14. Determination of the initial energy in computerized tomography with proton beams; Determinacao da energia inicial em tomografia computadorizada com feixe de protons

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Rodrigo Luis da

    2007-07-01

    In earliest works devoted to proton computed tomography it was shown that the advantage of pCT image reconstruction appears when the energy is close to the Bragg peak region, since the proton passes the object. This effect provided by the Bragg peak makes the computerized tomography with protons possible. However, when decreasing the initial proton energy, with the increase of the irradiation dose, there are two effects that work simultaneously in opposite ways. First, the energy loss of a proton in an object becomes bigger at small initial energy. At the same time decreasing of the proton energy results in the increase of the energy straggling, requiring a larger number of protons. In this work the radiation dose dependence on the proton initial energy was studied using analytical formulas and computer simulations. The investigation determined that the radiation dose practically does not depend on the initial energy, except in the energy region very close to the minimum energy necessary to pass the object. (author)

  15. Dosimetry in Computed Tomography head and neck scans; Dosimetria em varreduras de Tomografia Computadorizada de cabeça e pescoço

    Energy Technology Data Exchange (ETDEWEB)

    Gómez, A.M.L.; Santana, P.C.; Mourão, A.P., E-mail: amlgphys@gmail.com [Universidade Federal de Minas Gerais (UFMG), Berlo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear

    2017-07-01

    Non-invasive diagnostic methods for X-rays, such as computed tomography (CT), have shown rapid growth in radiology services. There is concern about the radiation doses deposited in patients because the CT scans are the ones that contribute most to the dose increase in the population. The legislation for regulating patient dose levels only imposes an upper limit for a given test, depending on the region of the body to be irradiated. Therefore, it is necessary to know the dose values deposited in patients referring to routine protocols used in radiology services and propose an optimization of these according to the principles of radiological protection. Experiments were performed to determine the dose profile deposited in routine adult patient head scans using a male anthropomorphic simulator. Radiochromic film strips were introduced in the central region of the simulator to record the dose profile in the head and neck region and thus determine the air kerma values within the simulator object. Four scans were performed on a General Electric 64-channel tomograph programmed in helical mode and the scans were made with voltages of 80, 100 and 120 kV, and fixed current and automatic current control were used. The mean values recorded on the strips ranged from 14.82 to 22.98 mGy. Imaging noise analyzes were performed so that for all the scans the images obtained were considered of diagnostic quality and the Kerma values in the air when converted to absorbed dose are diagnostic parameters acceptable in the Brazilian legislation.

  16. Evaluation of the normal thoracic and abdominal aorta diameters by computerized tomography; Avaliacao dos diametros normais da aorta toracica e abdominal pela tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Lucarelli, Claudio Luiz

    1995-07-01

    The study was undertaken to evaluate, through computerized tomography, the diameters of the normal thoracic and abdominal aorta, as well as they are connected to gender, age and body surface area; and the ratio between measurements obtained at the ascending and descending limbs of the thoracic aorta, and between the abdominal aortic diameters. For that reason, we measured the widest anteroposterior diameters of the thoracic aortas at the levels of the arch, the root, the pulmonary artery, and the thoracic-abdominal transition, as well as the level of the emergence of the superior mesenteric artery, of the renal hila and just cephalad to the bifurcation of the abdominal aortas of 350 patients without cardiovascular diseases who had undergone computerized tomography of the thorax and/or abdomen for any other reasons. Observation and statistic analyses led us to conclude that: 1) both the thoracic and abdominal aortic diameters are reduced from their proximal to their distal portions; 2) the body surface influences the size of the aorta, although only extreme variations alter the vessel's caliber; 3) vessel diameter was observed to gradually increase with age; 4) men were found to have larger diameters than age matched women; 5) the ratio between the ascending and descending aortic diameters varies according to gender and age; 6) the relations between abdominal aortic diameters measured at the level of renal hila and cephalad to the bifurcation are independent from gender and age. But the relation between those measured at the level of the superior mesenteric artery and cephalad to the bifurcation are linked to gender, but not to age. (author)

  17. Wavelets in quantification of liver tumors in contrasted computed tomography images; Wavelets na quantificacao de tumores de figado em exames contrastados de tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Bruna T.; Alvarez, Matheus; Souza, Rafael T.F.; Miranda, Jose R.A., E-mail: matheus@ibb.unesp.br [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Instituto de Biociencias. Departamento de Fisica e Biofisica; Romeiro, Fernando G. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Fac de Mediciana. Departamento de Clinica Medica; Pina, Diana R. de; Trindade, Andre Petean [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil). Fac. de Medicina. Departamento de Doencas Tropicais e Diagnostico por Imagem

    2012-12-15

    This paper presents an original methodology of liver tumors segmentation, based on wavelet transform. A virtual phantom was constructed with the same mean and standard deviation of the intensity of gray presented by the measured liver tissue. The optimized algorithm had a sensitivity ranging from 0.81 to 0.83, with a specificity of 0.95 for differentiation of hepatic tumors from normal tissues. We obtained a 96% agreement between the pixels segmented by an experienced radiologist and the algorithm presented here. According to the results shown in this work, the algorithm is optimal for the beginning of the tests for quantification of liver tumors in retrospective surveys. (author)

  18. Automatic 2D segmentation of airways in thorax computed tomography images; Segmentacao automatica 2D de vias aereas em imagens de tomografia computadorizada do torax

    Energy Technology Data Exchange (ETDEWEB)

    Cavalcante, Tarique da Silveira; Cortez, Paulo Cesar; Almeida, Thomaz Maia de, E-mail: tarique@lesc.ufc.br [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Engenharia de Teleinformatica; Felix, John Hebert da Silva [Universidade da Integracao Internacional da Lusofonia Afro-Brasileira (UNILAB), Redencao, CE (Brazil). Departamento de Energias; Holanda, Marcelo Alcantara [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Fac. de Medicina

    2013-07-01

    Introduction: much of the world population is affected by pulmonary diseases, such as the bronchial asthma, bronchitis and bronchiectasis. The bronchial diagnosis is based on the airways state. In this sense, the automatic segmentation of the airways in Computed Tomography (CT) scans is a critical step in the aid to diagnosis of these diseases. Methods: this paper evaluates algorithms for airway automatic segmentation, using Neural Network Multilayer Perceptron (MLP) and Lung Densities Analysis (LDA) for detecting airways, along with Region Growing (RG), Active Contour Method (ACM) Balloon and Topology Adaptive to segment them. Results: we obtained results in three stages: comparative analysis of the detection algorithms MLP and LDA, with a gold standard acquired by three physicians with expertise in CT imaging of the chest; comparative analysis of segmentation algorithms ACM Balloon, ACM Topology Adaptive, MLP and RG; and evaluation of possible combinations between segmentation and detection algorithms, resulting in the complete method for automatic segmentation of the airways in 2D. Conclusion: the low incidence of false negative and the significant reduction of false positive, results in similarity coefficient and sensitivity exceeding 91% and 87% respectively, for a combination of algorithms with satisfactory segmentation quality. (author)

  19. Method of evaluation of diagnostics reference levels in computerized tomography; Metodo de avaliacao de niveis de referencia de radiodiagnostico em tomografia computadorizada

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    Vega, Walter Flores

    1999-04-01

    Computerized tomography is a complex technique with several selectable exposition parameters delivering high doses to the patient. In this work it was developed a simple methodology to evaluate diagnostic reference levels in computerized tomography, using the concept of Multiple Scan Average Dose (MSAD), recently adopted by the Health Ministry. For evaluation of the MSAD, a dose distribution was obtained through a measured dose profile on the axial axis of a water phantom with thermoluminescence dosemeters, TLD-100, for different exam technique. The MSAD was evaluated hrough two distinct methods. First, it was evaluated by the integration of the dose profile of a single slice and, second, obtained by the integration on central slice of the profile of several slices. The latter is in of accordance with the ionization chamber method, suggesting to be the most practical method of dose evaluation to be applied in the diagnostic reference level assessment routine for CT, using TLDs. (author)

  20. Relationship between CT scans and serum tests for diagnosing tuberculosis; Relacao entre imagens de tomografia computadorizada e exames sericos no diagnostico da tuberculose

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    Oliveira, Marcela de; Pina, Diana R.; Giacomini, Guilherme; Alvarez, Matheus; Pavan, Ana Luiza M.; Pereira, Paulo C.M. [Universidade Estadual Paulista Julio de Mesquita Filho (UNESP), Botucatu, SP (Brazil)

    2014-07-01

    Tuberculosis (TB) is one of the oldest infectious diseases in the world and still affects humanity today. Since 1993, the World Health Organization (WHO) considers TB as a global emergency. The clinical history of the individual, the serum exams and particularly, the imaging examination of the thorax, are used for diagnostic confirmation and monitoring of disease. TB is a chronic disease that usually evolves with pulmonary sequelae that must be monitored. The exam of the image more precise to assess the radiological patterns found in these patients is high-resolution computed tomography (HRCT), which aids in medical diagnosis and permit the determination of the area affected by radiological abnormalities of pulmonary tuberculosis. The best known of such modifications by means of exams or more accurate techniques is of extreme importance. Therefore, this study aimed to show the quantification, performed by algorithms, of the areas affected by the radiological abnormalities of TB through the HRCT, and compared with serum exams. We studied 16 patients with confirmed diagnosis of TB. The serum exams evaluated included: hemoglobin, hematocrit, albumin, speed hemo sedimentation and C-reactive protein. With the values of serum exams we observed that patients have anemia, low albumin levels and inflammatory activity, corroborating imaging exams, which show severe impairment of lung area due to the inflammation caused by disease activity. (author)

  1. Evaluation of the normal thoracic and abdominal aorta diameters by computerized tomography; Avaliacao dos diametros normais da aorta toracica e abdominal pela tomografia computadorizada

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    Lucarelli, Claudio Luiz

    1995-07-01

    The study was undertaken to evaluate, through computerized tomography, the diameters of the normal thoracic and abdominal aorta, as well as they are connected to gender, age and body surface area; and the ratio between measurements obtained at the ascending and descending limbs of the thoracic aorta, and between the abdominal aortic diameters. For that reason, we measured the widest anteroposterior diameters of the thoracic aortas at the levels of the arch, the root, the pulmonary artery, and the thoracic-abdominal transition, as well as the level of the emergence of the superior mesenteric artery, of the renal hila and just cephalad to the bifurcation of the abdominal aortas of 350 patients without cardiovascular diseases who had undergone computerized tomography of the thorax and/or abdomen for any other reasons. Observation and statistic analyses led us to conclude that: 1) both the thoracic and abdominal aortic diameters are reduced from their proximal to their distal portions; 2) the body surface influences the size of the aorta, although only extreme variations alter the vessel's caliber; 3) vessel diameter was observed to gradually increase with age; 4) men were found to have larger diameters than age matched women; 5) the ratio between the ascending and descending aortic diameters varies according to gender and age; 6) the relations between abdominal aortic diameters measured at the level of renal hila and cephalad to the bifurcation are independent from gender and age. But the relation between those measured at the level of the superior mesenteric artery and cephalad to the bifurcation are linked to gender, but not to age. (author)

  2. Survey of computed tomography doses in head and chest protocols; Levantamento de doses em tomografia computadorizada em protocolos de cranio e torax

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    Souza, Giordana Salvi de; Silva, Ana Maria Marques da, E-mail: giordana.souza@acad.pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Faculdade de Fisica. Nucleo de Pesquisa em Imagens Medicas

    2016-07-01

    Computed tomography is a clinical tool for the diagnosis of patients. However, the patient is subjected to a complex dose distribution. The aim of this study was to survey dose indicators in head and chest protocols CT scans, in terms of Dose-Length Product(DLP) and effective dose for adult and pediatric patients, comparing them with diagnostic reference levels in the literature. Patients were divided into age groups and the following image acquisition parameters were collected: age, kV, mAs, Volumetric Computed Tomography Dose Index (CTDIvol) and DLP. The effective dose was found multiplying DLP by correction factors. The results were obtained from the third quartile and showed the importance of determining kV and mAs values for each patient depending on the studied region, age and thickness. (author)

  3. Survey of computed tomography doses in head and chest protocols; Levantamento de doses em tomografia computadorizada em protocolos de cranio e torax

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Giordana Salvi de; Froner, Ana Paula Pastre; Silva, Ana Maria Marques da, E-mail: giordana.souza@acad.pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Faculdade de Fisica. Nucleo de Pesquisa em Imagens Medicas

    2016-07-01

    Surveys of dose estimates from different medical imaging modalities highlight significant variations between health care facilities for the same examination and similar patient groups. To ensure that doses are optimized, diagnostic reference levels (DRL) must be determined, allowing the identification of procedures that are out of optimal standards. The aim of this study is to present a retrospective survey of dose indicators in head and chest CT scans, in terms of Dose-Length Product (DLP) and effective dose for adult and pediatric patients, comparing them with DRL in the literature. The study was performed with data from 293 patients submitted to computed tomography of the skull and 146 of the thorax, divided into age groups (0⊣ 1; 1⊣ 5; 5⊣ 10; 10⊣ 15; >15. For head, DLP third percentiles and effective doses are mostly higher than DRL in literature, mainly for children from 10⊣15 years (800 mGy.cm; 3,3 mSv) and 5⊣ 10 years (969 mGy.cm; 2,6 mSv). For thorax examination, although DLP are close to the DRL in literature, high variability is revealed, and the effective doses are higher for all ages. In conclusion, the survey of dose indicators in computed tomography examinations and their comparison with DRL constitute an important tool for the optimization of doses in patients. (author)

  4. Aspects of pulmonary histiocytosis X on high resolution computed tomography; Aspectos da histiocitose X pulmonar na tomografia computadorizada de alta resolucao (TCAR)

    Energy Technology Data Exchange (ETDEWEB)

    Costa, N.S.S.; Castro Lessa Angela, M.T. de; Angelo Junior, J.R.L.; Silva, F.M.D.; Kavakama, J.; Carvalho, C.R.R. de; Cerri, G.G. [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Hospital das Clinicas. Inst. do Coracao

    1995-01-01

    Pulmonary histiocytosis X is a disease that occurs in young adults and presents with nodules and cysts, mainly in upper lobes, with consequent pulmonary fibrosis. These pulmonary changes are virtually pathognomonic findings on high resolution computed tomography, that allows estimate the area of the lung involved and distinguish histiocytosis X from other disorders that also produces nodules and cysts. (author). 10 refs, 2 tabs, 6 figs.

  5. Hypersensitivity pneumonitis (extrinsic allergic alveolitis): high-resolution computed tomography findings; Pneumonite por hipersensibilidade (alveolite alergica extrinseca): achados na tomografia computadorizada de alta resolucao

    Energy Technology Data Exchange (ETDEWEB)

    Almeida Junior, Jose Guiomar de; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Faculdade de Ciencias Medicas. Dept. de Radiologia]. E-mail: edmarchiori@zipmail.com.br; Escuissato, Dante L. [Parana Univ., Curitiba, PR (Brazil). Dept. de Radiologia; Souza Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Dept. de Radiologia; Gasparetto, Emerson L. [Parana Univ., Curitiba, PR (Brazil). Hospital de Clinicas; Nobre, Luiz Felipe [Santa Catarina Univ., Florianopolis, SC (Brazil); Irion, Klaus L. [Santa Casa de Misericordia de Porto Alegre, RS (Brazil). Pavilhao Pereira Filho. Servico de Radiologia

    2003-12-01

    Hypersensitivity pneumonitis, or extrinsic allergic alveolitis, is an immunologic disease of the lungs caused by inhaled chemicals or organics allergens. A lymphocytic inflammatory response in the peripheral airways and surrounding interstitial tissue occurs. In this study the high-resolution computed tomography findings of 13 patients with hypersensitivity pneumonitis were analyzed and discussed. The most frequent high-resolution computed tomography findings were: ground-glass opacities (92.3%), centrilobular nodules (38.4%) and air trapping (38.4%). Other findings included bronchiectasis (23.1%), consolidation (23.1%), crazy paving (7.7%), parenchymal bands (15.4%), linear opacities (7.7%), architectural distortion (7.7%), tracheal dilatation (7.7%), intralobular reticulate (7.7%), honeycombing (7.7%), emphysema (7.7%) and atelectasis (7.7%). In two of the 13 patients there was fibrosis (architectural distortion and honeycombing), which represents the chronic phase of the disease. (author)

  6. Anatomic relationship of the optic nerve channel with sphenoid al sinus: a computed tomography study; Relacao anatomica do nervo optico com o seio esfenoidal: estudo por tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Paulo Cesar J. [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil); Albernaz, Pedro Luiz M. [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Dept. de Otorrinolaringologia e Disturbios da Comunicacao Humana; Yamashida, Helio K. [Universidade Federal de Sao Paulo (UNIFESP/EPM), SP (Brazil). Dept. de Diagnostico por Imagem

    2004-09-15

    The sphenoid sinus, out of the facial sinuses, is certainly the most neglected as far as diagnosis is concerned. The surgical approach requires a detailed anatomical knowledge, considering the serious complications resulting from injuries of vital structures adjacent to this region. Aim: the objective of our research is to evaluate the anatomic relationship of the optic nerve with the sphenoid sinus making use of the computed tomography. Study design: series report. Material and method: the authors present a retrospective analysis of 203 computed tomographies of facial sinus belonging to individuals of both sexes aged 14 and over. The examinations were evaluated observing the course of the optic nerve, obtained through the degree of its projection on the wall of the sphenoid sinus. The method used was the modified classification of Delano, evaluating the absence of bone reduction (dehiscence) of the optic nerve in the sphenoid sinus. We analysed the degree of pneumatization of the sphenoid sinus, using Hammer's classification adapted by Guerrero, apart from the pneumatization of the anterior clinoidal process and pterigoid and the presence of the Onodi cell. Results: most of the patients (78.96%) presented their optic nerve with a type 1 course. Type 2 was observed in 16.83% of the patients, type 3 in 3.47% and type 4 in 0.74%. The presence of dehiscence of the optic nerve in the wall of the sphenoid sinus was evidenced in 21.29% of the cases. Related to pneumatization, we noticed that the pre-selar type was observed in 6.44%, the post-selar type appeared in 39.11%, the selar type appeared in 54.45%, and the apneumatized type was not observed in any of the cases. The pneumatization of the anterior clinoidal process was verified in 10.64% of the cases, while the pterigoid process was apparent in 21.29% of the cases. The Onodi cell (sphenoetmoidal) was found in 7.92% of the cases. Conclusion: the presence of dehiscence of the optic nerve is related with the degree of pneumatization of the anterior clinoid and the pterigoid processes, the presence of the Onodi cell (sphenoetmoidal) and course types 2, 3 and 4 considered the relationship between the optic nerve and the sphenoid sinus. (author)

  7. Análise de dentição mista: tomografia versus predição e medida radiográfica Mixed-dentition analysis: tomography versus radiographic prediction and measurement

    Directory of Open Access Journals (Sweden)

    Letícia Guilherme Felício

    2010-10-01

    Full Text Available OBJETIVO: o objetivo dos autores desse estudo foi comparar o método de análise de dentição mista que utiliza tomografia computadorizada de feixe cônico para avaliar os diâmetros dos dentes intraósseos com os métodos de Moyers, Tanaka-Johnston e radiografias oblíquas em 45º. MÉTODOS: foram realizadas medidas, na arcada inferior, dos diâmetros mesiodistais dos incisivos permanentes irrompidos, nos modelos de gesso com auxílio de paquímetro digital e estimativa do tamanho de pré-molares e caninos permanentes ainda não irrompidos utilizando-se a tabela de Moyers e a fórmula de predição de Tanaka-Johnston. Nas radiografias oblíquas em 45º, caninos e pré-molares foram medidos utilizando-se o mesmo instrumento. Nas tomografias, as mesmas unidades dentárias foram aferidas por meio de ferramentas do programa Dolphin. RESULTADOS: a análise estatística revelou elevada concordância entre o método tomográfico e o radiográfico, e baixa concordância entre o tomográfico e os demais avaliados. CONCLUSÃO: a tomografia computadorizada de feixe cônico mostrou-se confiável para análise da dentição mista e apresenta algumas vantagens em relação aos métodos comparados: a observação e mensuração dos dentes intraósseos individualmente, com a possibilidade, contudo, de visualizá-los sob diferentes perspectivas e sem superposição de estruturas anatômicas.OBJECTIVE: The aim of this study was to evaluate the method for mixed-dentition analysis using Cone-Beam Computed Tomography for assessing the diameter of intra-osseous teeth and compare the results with those obtained by Moyers, Tanaka-Johnston, and 45-degree oblique radiographs. METHODS: Measurements of mesial-distal diameters of erupted lower permanent incisors were made on plaster cast models by using a digital calliper, whereas assessment of the size of non-erupted permanent pre-molars and canines was performed by using Moyer's table and Tanaka-Johnston's prediction

  8. Eletrocardiografia computadorizada em cães: estudo comparativo

    Directory of Open Access Journals (Sweden)

    Lídia S. Oliveira

    2013-07-01

    Full Text Available O método de eletrocardiografia computadorizada (ECG-C vem sendo crescentemente difundido na medicina veterinária, havendo atualmente diversas marcas e modelos de eletrocardiógrafos disponíveis no mercado. Diante da possibilidade de diferenças na sensibilidade e na reprodutibilidade das medidas obtidas nos traçados, o presente estudo teve como objetivo comparar os parâmetros eletrocardiográficos de cães, obtidos por dois sistemas. Foram avaliados dois diferentes softwares computadorizados, o Wincardio Micromed® (WIN e o modelo TEB ECGPC® (TEB. Quarenta e dois cães hígidos, de diferentes raças (Cocker Spaniel, Daschund, Labrador, Pinscher, Pit Bull Terrier Poodle, Schnauzer, Shit Tzu, Yorkshire e sem raça definida, machos e fêmeas e com idade entre 4 meses e 16 anos foram agrupados segundo o peso e examinados pelos dois sistemas. As medidas eletrocardiográficas dos diferentes traçados foram analisadas na derivação DII. Os resultados indicaram que o sistema TEB apresentou maior sensibilidade na obtenção das medidas de duração da onda P e do complexo QRS, enquanto o sistema WIN foi mais sensível para determinar as medidas de amplitude dos mesmos parâmetros. Os animais de maior porte (26-37kg apresentaram maior variância nas medidas de duração e amplitude de onda P e duração do complexo QRS em comparação aos cães de médio (14-25kg e pequeno (1-13kg porte. O achado de diferenças entre os sistemas testados deve ser levado em consideração ao se empregar os diversos equipamentos para diagnóstico por meio de ECG-C na rotina clínica, de modo a evitarem-se divergências na interpretação dos exames entre diferentes prestadores de serviços veterinários.

  9. É hora de investirmos em intervenções comportamentais computadorizadas no Brasil?

    Directory of Open Access Journals (Sweden)

    Henrique Pinto Gomide

    2013-06-01

    Full Text Available Intervenções comportamentais computadorizadas apresentam evidências de eficácia para diversas condições de saúde, como transtornos de ansiedade ou de humor e abuso do uso de álcool e tabagismo. Embora apresentem efeitos relativamente pequenos, elas podem atingir um grande número de usuários simultaneamente e funcionar de forma ininterrupta. Os objetivos do presente estudo foram: 1 analisar criticamente as evidências de eficácia presentes na literatura sobre intervenções comportamentais computadorizadas; 2 avaliar o potencial de utilização no país; 3 descrever a regulamentação existente; e 4 apresentar ferramentas para desenvolvimento destas intervenções através de uma revisão narrativa da literatura. As intervenções comportamentais computadorizadas se configuram como uma potencial ferramenta para a saúde pública, devido ao crescimento do uso de computadores e internet no Brasil e ao baixo custo de seu desenvolvimento.

  10. Detection of myocardial viability by means of Single Proton Emission Computed Tomography (Perfused SPECT) dual {sup 201} Tl (rest of 15 minutes, 24 late hours and 24 hours reinjection) and gated-SPECT {sup 99m} Tc-SESTAMIBI in effort or stimulation of the coronary reserves; Deteccion de viabilidad miocardica mediante tomografia por emision de foton unico (SPECT perfusorio) dual {sup 201} Talio (Reposo de 15 minutos, 24 horas tardio y 24 horas reinyeccion) y gated-SPECT {sup 99m} Tc-SESTAMIBI en esfuerzo o estimulo de reserva coronaria

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza V, R

    2004-07-01

    The objective of this work was to determine if the images of SPECT {sup 201} TI in rest of 15 minutes, 24 late hours and Gated-SPECT {sup 99m} Tc-SESTAMIBI in effort or stimulation of coronary reservation correlate with the study of 24 hours post reinjection of {sup 201}TI to determine the presence of having knitted viable myocardium. Material and methods: 29 patients were studied with coronary arterial illness (EAC) to who are carried out SPECT {sup 201} TI in rest with images of 15 minutes, 24 late hours and 24 hours reinjection, by means of the administration of {sup 201}TI to dose of 130 MBq and reinjection with 37 MBq. and Gated-SPECT {sup 99m}Tc-SESTAMIBI in effort or stimulation of coronary reservation, later to the administration of 1110 MBq. Results: 29 patients were included according to inclusion approaches and exclusion, of those which 22 (75.86%) they correspond at the masculine sex and 7 (24.13%) to the feminine one, with an average of 62.1 year-old age, 2320 segments myocardial were analysed so much it is phase post-effort as rest; they were diagnosed a total of 264 segments with heart attack, of which viability myocardium was observed in 174 segments. The statistical tests are analysis of frequencies. The non parametric test of Wilcoxon and Mann-Whitney. Conclusions: the viability myocardial at the 24 late hours and 24 hours reinjection was similar; significant difference exists between the study of 15 minutes and 24 hours reinjection, ischemic illness was also demonstrated in territories different to the heart attack area in the studies of 15 minutes, late 24 hours and 24 hours reinjection. (Author)

  11. Multiphasic helical CT of hepatocellular carcinoma. Evaluation after chemoembolization; Tomografia Computerizzata spirale multifasica dell'epatocarcinoma. Valutazione dopo chemioembolizzazione

    Energy Technology Data Exchange (ETDEWEB)

    Catalano, O.; Esposito, M.; Sandomenico, F.; Siani, A. [Ospedale S. Maria delle Grazie, Pozzuoli, NA (Italy). Servizio di Radiologia; Nunziata, A. [Ospedale S. Maria delle Grazie, Naples (Italy). Area di Diagnostica per Immagini

    2000-06-01

    technique has several limitations, as also shown in recent literature papers and its clinical applications should be reduced. Multiphase helical studies may provide useful information and should be performed routinely in patients treated with chemo embolization. The present availability of alternative tools such as contrast-enhanced Doppler US and MRI should also be stressed and their potential role investigated. [Italian] Il presente lavoro si propone di illustrare la personale esperienza sull'integrazione della Tomografia Computerizzata (TC) senza mdc ev (Lipiodol-TC) con la TC spirale con mdc ev multifasica nella valutazione dei pazienti con epatocarcinoma trattati con chemioembolizzazione e analizzare il possibile ruolo attuale della TC con mdc oleoso. Si sono valutati retrospettivamente gli esami di 42 pazienti consecutivi sottoposti a chemioembolizzazione globale nell'arco di 2 anni. Lo studio con TC e' stato praticato 1830 giorni dopo il trattamento. La Lipiodol-TC e' stata eseguita con acquisione volumetrica; si sono considerati noduli quelle aree delimitate con ritenzione densa del mdc oleoso e si sono distinti la captazione in: 0=assente, I=inferiore a 10% dell'area del tumore, II=minore di 50%, III=maggiore di 50%, IV=omogenea. Lo studio con TC spirale con mdc ev e' stato praticato con tecnica bifasica in 28 pazienti e trifasica in 14; abbiamo ritenuto come nodulari quelle aree ben delimitate e relativamente omogenee con iperdensita' nella fase arteriosa e ipo-isodensita' in quella portale e/o tardiva oppure con ipo-isodensita' nella fase arteriosa e in quella portale e/o tardiva. Con la Lipiodol-TC sono stati identificati 65 noduli (1-5/paziente, media 1,5), 15 con grado I, 21 con grado II, 20 con grado III e 9 con grado IV. Con la TC multifasica sono stati dimostrati 6 noduli supplementari in 5 pazienti, di cui 5 iper-e uno ipovascolare, ed e' stata documentata meglio la reale morfovolumetria dei noduli con

  12. Helical CT defecography; La defecografia con Tomografia Computerizzata spirale

    Energy Technology Data Exchange (ETDEWEB)

    Ferrando, R.; Fiorini, G.; Beghello, A.; Cicio, G.R.; Derchi, L.E.; Consigliere, M.; Resasco, M. [Genua Univ., Genua (Italy). Ist. di Radiologia, Cattedra R; Tornago, S. [Genua Univ. Genua (Italy). 2 Clinica Ortopedica

    1999-11-01

    The purpose of this work is to investigate the possible role of Helical CT defecography in pelvic floor disorders by comparing the results of the investigations with those of conventional defecography. The series analyzed consisted of 90 patients, namely 62 women and 28 men, ranging in age 24-82 years. They were all submitted to conventional defecography, and 18 questionable cases were also studied with Helical CT defecography. The conventional examination was performed during the 4 standard phases of resting, squeezing, Valsalva and straining; it is used a remote-control unit. The parameters for Helical CT defecography were: 5 mm beam collimation, pitch 2, 120 KV, 250 m As and 18-20 degrees gantry inclination to acquire coronal images of the pelvic floor. The rectal ampulla was distended with a bolus of 300 mL nonionic iodinated contrast agent (dilution: 3g/cc). The patient wore a napkin and was seated on the table, except for those who could not hold the position and were thus examined supine. Twenty-second helical scans were performed at rest and during evacuation; multiplanar reconstructions were obtained especially on the sagittal plane for comparison with conventional defecographic images. Coronal Helical CT defecography images permitted to map the perineal floor muscles, while sagittal reconstructions provided information on the ampulla and the levator ani. To conclude, Helical CT defecography performed well in study of pelvic floor disorders and can follow conventional defecography especially in questionable cases. [Italian] Scopo di questo lavoro e' ricercare un ruolo per la defeco-TC con apparecchiatura elicoidale nello studio delle malattie del pavimento pelvico confrontandola con i risultati consolidati della defecografia tradizionale. Si sono visionati 90 pazienti, 62 femmine e 28 maschi, con eta' compresa tra 24 e 82 anni, con defecografia tradizionale; di questi, 18 casi con diagnosi dubbia sono stati studiati anche con defeco-TC spirale

  13. Hepatocellular carcinoma: computed tomography assessment after invasive treatment;Hepatocarcinoma: Evaluacion con tomografia computada luego del tratamiento intervencionista

    Energy Technology Data Exchange (ETDEWEB)

    Kozima, Shigeru; Larranaga, Nebil; Wulfson, Gabriela [Servicio de Diagnostico por Imagenes Hospital General de Agudos ' Cosme Argerich' , CABA, Buenos Aires (Argentina); Departamento de Imagenes, CEMIC, Buenos Aires (Argentina); Eisele, Guillermo [Departamento de Imagenes, CEMIC, Buenos Aires (Argentina); Ridruejo, Ezequiel; Mando, Oscar [Seccion de Hepatologia. Departamento de Medicina, CEMIC, Buenos Aires (Argentina); Perazzo, Florencia [Seccion Oncologia. Departamento de Medicina, CEMIC, Buenos Aires (Argentina)

    2008-07-01

    Objective: To show the computed tomography (CT) usefulness after treatment with transcatheter arterial quimioembolization and radiofrequency ablation of hepatocellular carcinoma. Material and methods: In a period between march 2006 to april 2008 a total of 90 patient presenting 148 nodular lesions with diagnosis of hepatocellular carcinoma were controlled with triphasic CT. All the lesions were treated with minimally invasive procedure. For the treatment, the patients were classified in two groups following Milan criteria. The first group, constituted by 75 patients with 109 nodules, was treated with quimioembolization. The second group, of 15 patients with 25 nodules, was treated with radiofrequency ablation. In our population, a subgroup of 10 patients was treated with both methods. Results: Of 90 patients after CT control on a month, 3 months and for each 3 months during 2 years, on 63 cases (70%) was observed homogeneous accumulation of iodized oil, partial defect without enhancement or absence of enhancement on treated lesions. In these patients a new treatment after initial one was not performed. The remaining 27 patients (30%) underwent new treatment because we founded partial defect or absence of iodized oil with enhancement or peripheral enhancement on arterial phase in treated lesions. In this last group, 16 treated patients (17.7%) had new nodular enhancement on the remaining hepatic parenquimal. Conclusion: The CT unenhanced and the arterial phase on a month and for each 3 months, allow monitoring the effectiveness, residual disease and/or relapse of hepatocellular carcinoma after minimally invasive treatment. (authors);Objetivo: Mostrar la utilidad de la tomografia computada trifasica (TCT) luego del tratamiento con quimioembolizacion y ablacion por radiofrecuencia (RF) del hepatocarcinoma (HCC). Material y metodos: En un periodo comprendido entre marzo de 2006 y abril de 2008 se controlaron con TCT 90 pacientes que presentaron 148 lesiones nodulares y

  14. Actitudes de los candidatos y maestros de ciencias en servicio acerca del uso de las herramientas computadorizadas en las clases de ciencias

    Science.gov (United States)

    Bayuelo, Ezequiel

    Este estudio examino y comparo las actitudes de los candidatos a maestros de ciencias y los maestros de ciencias en servicio acerca de la utilizacion de las herramientas computadorizadas en las clases de ciencias. Tambien identifico y diferencio el uso que ellos dan a estas herramientas en las clases de ciencias. Este estudio presenta un diseno descriptivo exploratorio. Constituyeron la muestra trescientos diez sujetos que fueron candidatos a maestros de ciencias o maestros de ciencias en servicio. Para recoger los datos se construyo y valido un cuestionario de treinta y un itemes. Se utilizaron las pruebas estadisticas no parametricas Kruskal Wallis y Chi-cuadrado (test de homogeneidad) para establecer las diferencias entre las actitudes de los sujetos con relacion al uso de las herramientas computadorizadas en las clases de ciencias. Los hallazgos evidenciaron que son positivas y muy parecidas las actitudes de los candidatos a maestros y maestros en servicio hacia el uso de las herramientas computadorizadas. No hubo diferencias entre los candidatos y maestros en servicio en terminos de las actitudes de confianza y empatia hacia el uso de las herramientas computadorizadas en las clases de ciencias. En aspectos como el uso del banco de datos bibliografico Eric y el uso de las herramientas computadorizadas en actividades educativas como explorar conceptos, conceptuar, aplicar lo aprendido y hacer asignaciones hubo diferencias estadisticamente significativas entre los candidatos y los maestros en servicio. Al comparar las frecuencias observadas con las esperadas hubo mas maestros en servicio y menos candidatos que indicaron usar el anterior banco de datos y las herramientas computadorizadas en las mencionadas actividades educativas.

  15. Evaluation of standard and use tendency of image diagnosis exams in Brazil with emphasis in pediatric computerized tomography; Avaliacao do padrao e tendencia de uso de exames de diagnostico por imagem no Brasil com enfase em tomografia computadorizada pediatrica

    Energy Technology Data Exchange (ETDEWEB)

    Dovales, Ana Cristina Murta

    2016-07-01

    There is little information on developing countries about the use of diagnostic imaging procedures and the doses associated with radiological examinations. This study assessed the pattern and trend of diagnostic imaging usage in outpatients of the Brazilian Unified Health System (SUS) by modality and examined body part. Emphasis was given to computed tomography (CT) scans for which the analysis was extended to the private health care sector and included the evaluation of age at examination distribution, and dose estimation for children and young adults. Information on the use of diagnostic imaging procedures among SUS outpatients was obtained from the Outpatient Information System (SIA) of the Department of Information Technology of SUS (DATASUS). Data on the use of CT in the private health care sector were extracted from the Radiological Information Systems (RIS) of 25 private radiology services in 8 Brazilian cities. Effective doses and absorbed doses on organs of interest were estimated individually for 4,497 patients younger than 20 years of age using CT scan technical parameters and Monte Carlo simulations of radiation transport. Between 2002 and 2012 it was observed that conventional radiology was the most frequent modality of diagnostic imaging in SUS outpatients, but more sophisticated modalities, such as CT and magnetic resonance imaging, had the highest growth rates over the study period. The most frequent CT scan in SUS outpatients between 2001 and 2011 was the head/neck exam, but abdomen/pelvis examinations were the ones that grew the most. Patients up to 20 years of age made approximately 13% and 9% of the CT examinations between 2008 and 2014 in the public and private health care systems, respectively. About one-third of the private-sector patients had more than one CT scan in this period. There was great variation in doses, even for the same type of procedure in patients of the same age group. The highest mean effective dose was 13.5 mSv estimated for abdomen/pelvis CT in children younger than one year of age. The highest absorbed doses were estimated for the brain after head/neck CT (23.8 to 29.0 mGy), which was the most common type of CT in children and young adults in the study period. The intense increase, the magnitude of the estimated doses and the large proportion of pediatric CT scans in Brazil point out to the need for initiatives to promote appropriate justification and optimization of these examinations in Brazil. (author)

  16. Pneumocystis carinii pneumonia in acquired immunodeficiency syndrome - correlation of high-resolution computed tomography and anatomopathology; Pneumocistose na sindrome da imunodeficiencia adquirida: correlacao da tomografia computadorizada de alta resolucao com a anatomopatologia

    Energy Technology Data Exchange (ETDEWEB)

    Marchiori, Edson; Moreira, Luiza Beatriz [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia]. E-mail: edmarchiori@zipmail.com.br; Capone, Domenico [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Faculdade de Medicina; Moraes, Heleno Pinto de [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Patologia; Pereira, Cyntia Inez Guedes Soares

    2001-12-01

    We present the main findings observed on the high-resolution computed tomography examinations of 15 patients with acquired immunodeficiency syndrome and Pneumocystis carinii pneumonia. The high-resolution computed tomography and autopsy findings of 5 patients were also compared. The most frequently observed high-resolution computed tomography patterns were ground-glass attenuation, consolidation areas, crazy-paving pattern and cysts. Nodules and intralobular reticulation were less frequently observed. Ground-glass attenuation and consolidation areas corresponded to alveolar filling with inflammatory exudate. Thickening of the interlobular septa was due to cell infiltration and edema. One patient presented interlobular reticulation, and the pathology study revealed alveolar septa thickening due to cell infiltration and fibrosis. Nodules observed in one of the patients corresponded to a patchy intra alveolar accumulation of microorganisms and inflammatory cells forming a 'granulomatous' pattern. (author)

  17. Evaluation of multiple scan average dose (MSAD) levels in computerized tomography in Minas Gerais state, Brazil; Avaliacao dos niveis de dose media em cortes multiplos (MSAD) em tomografia computadorizada no estado de Minas Gerais

    Energy Technology Data Exchange (ETDEWEB)

    Alonso, Thessa C., E-mail: alonso@cdtn.br [Centro de Desenvolvimento de Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Vieira, Leandro de A.; Barbosa, Nayra V.; Oliveira, Jeyselaine R. de; Cesar, Adriana C.Z. [Secretaria de Vigilancia Sanitaria de Minas Gerais, Belo Horizonte, MG (Brazil); Silva, Teogenes A. da [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear. Programa de Ciencias e Tecnicas Nucleares

    2014-07-01

    Computed Tomography (CT) grows every year and is a diagnostic method that has revolutionized radiology with advances in procedures for obtaining image. However, the indiscriminate use of this method generates relatively high doses in patients. The diagnostic reference levels (DRLs) is a practical tool to promote the evaluation of existing protocols. The optimization and the periodic review of the protocols are important to balance the risk of radiation. The present study aims to conduct a survey of levels of MSAD of Minas Gerais following the procedures recommended by current Brazilian law. (author)

  18. Estudo comparativo do tono muscular na paralisia cerebral tetraparética em crianças com lesões predominantemente corticais ou subcorticais na tomografia computadorizada de crânio

    OpenAIRE

    Iwabe,Cristina; Piovesana,Ana Maria Sedrez Gonzaga

    2003-01-01

    OBJETIVO: Comparar a distribuição e intensidade do tono muscular na paralisia cerebral tetraparética espástica (PC-T), correlacionando os dados clínicos com a localização da lesão no sistema nervoso central. MÉTODO: Foram incluídas 12 crianças de dois a quatro anos de idade com lesões predominantemente corticais (seis crianças) e subcorticais (seis crianças). O tono foi analisado nos membros superiores (MMSS) e inferiores (MMII) baseado no protocolo de Durigon e Piemonte. RESULTADOS: Não houv...

  19. Computed tomography of head: impact of the use of automatic exposure control; Doses em tomografia computadorizada de crânio: impacto do uso do controle automático de exposição

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Giordana Salvi de Souza; Froner, Ana Paula Pastre; Silva, Ana Maria Marques da, E-mail: giordana.souza@acad.pucrs.br [Pontificia Universidade catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Núcleo de Pesquisa em Imagens Médicas

    2017-07-01

    The use of dose reduction systems in computed tomography is particularly important for pediatric patients, who have a high radiosensitivity, since they are in the growing phase. The aim of this study was to evaluate the impact of Siemens AEC Care Dose system use on dose estimation in head computed tomography scans in pediatric patients. A retrospective study was conducted with 199 computed tomography head scans of pediatric patients, divided in different age groups, on a 16-channel Siemens Emotion scanner. It was possible to observe, for all age groups, that the use of AEC Care Dose system, not only reduced CTDI{sub vol}, but also the interquartile range, reducing the total dose in the investigated population. Concluding, AEC Care Dose system models the tube current according to the patient's dimensions, reducing individual and collective dose without affecting the diagnostic quality . (author)

  20. Optimization of protocol in computerized tomography scans of children's chest; Otimização de protocolo em varreduras de tomografia computadorizada de tórax infantil

    Energy Technology Data Exchange (ETDEWEB)

    Lima, L.T.A.; Roberto, W. dos S.; Mourão Filho, A.P., E-mail: luanaabrao@gmail.com, E-mail: aprata@des.cefetmg.br [Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Belo Horizonte, MG (Brazil). Núcleo de Engenharia Hospitalar

    2017-07-01

    The diffusion of the Computed Tomography (CT) has promoted a significant increase of the dose absorbed by patients. This technique showed a high growth as a result of clinical cases of medical emergencies, neoplasia and pediatric traumas. The risks of stochastic effects are greater for children due to tissue radiosensitivity coupled with longer life expectancy. In the present work, a cylindrical simulator was used, representing an adult thorax made of polymethylmethacrylate (PMMA), and a second simulator object of the same material was developed in oblong format including the axillary regions, based on the dimensions of the patient's thorax one-year-old pediatric population. The scanning on the adult simulator object was performed with the chest radiograph diagnostic service with a 120 kV supply voltage and in the pediatric simulator object were performed optimized scans with 120, 100 and 80 kV. This work compared the dose variation absorbed by the pediatric simulator object mentioned by the change in the tube supply voltage.

  1. Optimization of recommendations for abdomen computerized tomography based on reconstruction filters, voltage and tube current; Otimizacao de protocolos de tomografia computadorizada de abdome com base nos filtros de reconstrucao, tensao e corrente do tubo

    Energy Technology Data Exchange (ETDEWEB)

    Silveira, Vinicius da Costa

    2015-07-01

    The use of computed tomography has increased significantly over the past decades. In Brazil the use increased more than twofold from 2008 to 2014, in the meantime the abdomen procedures have tripled. The high frequency of this procedure combined by the increasing collective radiation dose in medical exposures, has resulted development tools to maximize the benefit in CT images. This work aimed to establish protocols optimized in abdominal CT through acquisitions parameters and reconstructions techniques based on filters kernels. A sample of patients undergoing abdominal CT in a diagnostic center of Rio de Janeiro was assessed. Had been collected patients information and acquisitions parameters. The phantoms CT image acquisitions were performed by using different voltage values by adjusting the tube current (mAs) to obtain the same value from CTDI{sub vol} patients with normal BMI. Afterwards, the CTDIvol values were reduced by 30%, 50% and 60%. All images were reconstructed with low-contrast filters (A) and standard filters (B). The CTDIvol values for patients with normal BMI were 7% higher than in patients with underweight BMI and 30%, 50% and 60% lower than the overweight, obese I and III patients, respectively. The evaluations of image quality showed that variation of the current (mA) and the reconstruction filters did not affect the Hounsfield values. When the contrast-to-noise ratio (CNR) was normalized to CTDIvol, the protocols acquired with 60% reduction of CTDIvol with 140 kV and 80 kV showed CNR 6% lower than the routine. Modifications of the acquisition parameters did not affect spatial resolution, but the post-processing with B filters reduced the spatial frequency by 16%. With reduced the dose of 30%, lesions in the spleen had the CNR higher than 10% routine protocols with 140 kV acquired and post-processed to filter A. The image post-processing with a filter A with a 80kV voltage provided CNR values equal to the routine for the liver lesions with a 30% reduction in dose. This study demonstrated that the reduction in tube voltage and the image post-processing filter to enable a reduction in the radiation dose by 30%. (author)

  2. Computed tomography in Brazil: frequency and pattern of usage among inpatients of the Unified Health System (SUS); Tomografia computadorizada no Brasil: frequencia e padrao de uso em pacientes internados no Sistema Unico de Saude (SUS)

    Energy Technology Data Exchange (ETDEWEB)

    Dovales, Ana Cristina M.; Souza, Andressa A. de; Veiga, Lene H.S., E-mail: adovales@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2015-04-15

    This paper shows the frequency, pattern and trend of computed tomography use in inpatients of the Brazilian public health care system (SUS), from 2008 to 2011. Data were extracted from an Internet database provided by SUS. Head/neck examinations were the most frequent type of CT over the study period. The use of CT increased over time, with the greatest increase being observed for CT of extremities. (author)

  3. Optimization of the dose versus noise in the image on protocols for computed tomography of pediatric head;Otimizacao da relacao dose versus ruido na imagem em protocolos de tomografia computadorizada de cranio pediatrico

    Energy Technology Data Exchange (ETDEWEB)

    Saint' Yves, T.L.A.; Travassos, P.C.; Goncalves, E.A.S.; Mecca, F.A.; Silveira, T.B. [Instituto Nacional de Cancer (INCA), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    This article aims to establish protocols optimized for computed tomography of pediatric skull, to the Picker Q 2000 tomography of the Instituto Nacional de Cancer, through the analysis of dose x noise on the image with the variation of values of m As and k Vp. We used a water phantom to measure the noise, a pencil type ionization chamber to measure the dose in the air and the Alderson Randon phantom for check the quality of the image. We found values of m As and k Vp that reduce the skin dose of the original protocol used in 35.9%, maintaining the same image quality at a safe diagnosis. (author)

  4. Optimization on the dose versus noise in the image on protocols for computed tomography of pediatric head; Otimizacao da relacao dose versus ruido na imagem em protocolos de tomografia computadorizada de cranio pediatrico

    Energy Technology Data Exchange (ETDEWEB)

    Saint' Yves, Thalis L.A.; Travassos, Paulo Cesar B.; Goncalves, Elicardo A.S.; Mecca A, Fernando; Silveira, Thiago B. [Instituto Nacional do Cancer (INCa), Rio de Janeiro, RJ (Brazil)], e-mail: fmecca@inca.gov.br, e-mail: thalis09@yahoo.com.br

    2010-03-15

    This article aims to establish protocols optimized for computed tomography of pediatric skull, to the Picker Q2000 tomography of the Instituto Nacional de Cancer, through the analysis of dose x noise on the image with the variation of values of mAs and kVp. We used a water phantom to measure the noise, a pencil type ionization chamber to measure the dose in the air and the Alderson Randon phantom for check the quality of the image. We found values of mAs and kVp that reduce the skin dose of the original protocol used in 35.9%, maintaining the same image quality at a safe diagnosis. (author)

  5. The diagnostic contribution of computed tomography in intranasal carcinoma with retrobulbar, oral and brain invasion in a canine: case report; Contribuicao da tomografia computadorizada no diagnostico de carcinoma intranasal com invasao retrobular, oral e cerebral em canino: relato de caso

    Energy Technology Data Exchange (ETDEWEB)

    Zardo, Karen Maciel, E-mail: kmz@bol.com.br; Belotta, Alexandra Frey; Babicsak, Viviam Rocco; Machado, Vania Maria de Vasconcelos [Universidade Estadual Paulista Julio de Mesquita Filho (FMVZ/UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Reproducao Animal e Radiologia Veterinaria; Zanoni, Diogo Souza; Costa, Denis Carvalho [Universidade Estadual Paulista Julio de Mesquita Filho (FMVZ/UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Clinica Veterinaria

    2012-07-01

    Intranasal tumors are uncommon and in most cases are malignant, aggressive and with low to moderate potential for metastasis. Clinical signs are usually caused by progressive obstruction of the upper airways. The test cytopathological also is a diagnosis method, but the definitive diagnosis is made by histopathological. Computed tomography (CT) is recommended to treatment planning. A poodle was attended at the veterinary hospital with a clinical history of epistaxis and nasal and ocular secretions, seizures and severe dyspnoea. The animal underwent to radiographic examination of the chest and skull as well as helical computed tomography of the nasal cavity and brain before and after the administration of intravenous contrast. The CT findings revealed an expansive bilateral nasal cavity neoformation, with involvement of the retrobulbar space, right frontal sinus, brain and oral cavity, suggesting a neoplastic or an infectious process. The CT examination allowed the material collection, directly from the mass, to cytological examination, providing the diagnosis of carcinoma. CT also allowed the determination of the unfavorable prognosis of the patient and the treatment planning which not included the surgical excision of the neoformation. Although CT was not conclusive in the diagnosis of carcinoma, it was essential to accurately define the extent of the lesion, to guide the collection of material directly from the tumor and to determine the prognosis of the animal, proving to be an extremely useful tool in cases of tumors intranasal in dogs. (author)

  6. Tomografia computadorizada de feixe cônico como método de avaliação pós-tratamento endodôntico em sessão única ou em duas sessões

    OpenAIRE

    Claudia de Castro Rizzi Maia

    2014-01-01

    Resumo Introdução: Estudos epidemiológicos reportam elevada prevalência de lesão periapical em diferentes países, concluindo que esta constitui um problema de saúde que afeta grande parte da população. Proposição: O objetivo deste estudo clínico randomizado foi efetuar uma avaliação comparativa pós-tratamento endodôntico de dentes permanentes com lesão periapical crônica, realizado em sessão única ou em duas sessões com o uso de hidróxido de cálcio, por 14 dias, como curativo de demora entre ...

  7. Optimization of protocols and increase the life of the tube of X rays in computer tomography;Otimizacao de protocolos e aumento dsa vida util do tubo de raios X em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Viero, A.P. [Centro Universitario Franciscano, Santa Maria, RS (Brazil); Botelho, Marcel Z.; Torunsky, Caroline G. [STAFF - Solucoes em Fisica Medica e Radioprotecao, Santa Maria, RS (Brazil); Paula, V. [Clinica Radiologica Caridade (DIX), Santa Maria, RS (Brazil)

    2009-07-01

    The objective of this study was to evaluate the reduction of the radiation dose and X-ray tube heating in computed tomography exams. Exams of the skull, abdomen and thorax were evaluated. It was verified that the technique used could be changed, suggesting new protocols and comparing image quality, radiation dose and X-ray tube heating. A mAs reduction could be done without compromising the diagnostic quality bringing a decrease up to 21,92% in the dose of skull exams, 20,25% for the examinations, abdomen and 22,06% for the examinations of thorax. The reduction on the X-ray tube heating for skull, abdomen and thorax exams was approximately 22,2%, 20,0% and 22,2% respectively. It is concluded that a change on the described protocols will cause a significant reduction dose delivered to patients and on X-ray tube heating without compromising the diagnosis. (author)

  8. Computed tomography prospective study of pleural-pulmonary changes after abdominal surgery : assessment of associated risk factors; Estudo prospectivo por tomografia computadorizada das alteracoes pleuro-pulmonares apos cirurgia abdominal: avaliacao dos fatores de risco associados

    Energy Technology Data Exchange (ETDEWEB)

    Rossi, Luis Antonio [Pontificia Univ. Catolica de Sao Paulo, SP (Brazil). Centro de Ciencias Medicas e Biologicas]. E-mail: luizrossimd@uol.com.br; Bromberg, Sansom Henrique [Instituto de Assistencia Medica ao Servidor Publico Estadual de Sao Paulo (IAMSPE), Sao Paulo, SP (Brazil). Curso de Pos-graduacao em Gastroenterologia Cirurgica

    2005-07-01

    Postoperative pleural-pulmonary changes (PPC) are very common following elective abdominal surgery, resolving without clinical manifestations in most patients. The incidence and risk factors associated are unknown. Objective: to determine the incidence of PPC and possible association with risk factors using computerized tomography (CT). Material and method: thirty seven patients submitted to elective abdominal surgery were prospectively analyzed using CT performed in the preoperative period and 48 hours after surgery. The PPC was scored from 0 to III. The risk factors evaluated were: age, sex, obesity, smoking history, alcoholism, comorbid conditions, cancer, ASA classification, duration of surgery, surgical incision type and number of days of hospitalization. Results: Pleura effusion was detected by CT in 70.3% (26/37) of the patients and pulmonary atelectasis in 75.5% (28/37). Grade I and II PPC was found in 59.5% (22/37) of the patients and grade III in 21.6% (8/37). Two (5.4%) of these patients developed serious pulmonary complications whereas one patient died. Surgery due to cancer, class ASA >2, longitudinal incision and > 15 cm showed statistical significance and were associated with pleural effusion. The hospitalization was over 2.4 longer for patients with PPC. Conclusion: PPC is frequently seen in patients submitted to abdominal surgery. The use of the CT for the detection of pulmonary atelectasis and pleural effusion proved to be effective. Most cases of PPC are self-limited, resolving without symptoms. (author)

  9. Seeking tools for image fusion between computed tomography, structural and functional magnetic resonance methods for applications in neurosurgery; Ferramentas para fusao de imagens dos metodos de tomografia computadorizada, ressonancia magnetica e ressonancia magnetica funcional para aplicacao pre-neurocirurgica

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Liana Guerra Sanches da, E-mail: liana@einstein.br [Departamento de Diagnostico por Imagem, Hospital Israelita Albert Einstein - HIAE, Sao Paulo (SP) (Brazil); Amaro Junior, Edson [Faculdade de Medicina, Universidade de Sao Paulo - USP, Sao Paulo, SP (Brazil). Deptartamento de Diagnostico por Imagem; Instituto do Cerebro - InCe, Hospital Israelita Albert Einstein - HIAE, Sao Paulo, SP (Brazil)

    2012-04-15

    To evaluate tools for the fusion of images generated by tomography and structural and functional magnetic resonance imaging. Methods: Magnetic resonance and functional magnetic resonance imaging were performed while a volunteer who had previously undergone cranial tomography performed motor and somatosensory tasks in a 3-Tesla scanner. Image data were analyzed with different programs, and the results were compared. Results: We constructed a flow chart of computational processes that allowed measurement of the spatial congruence between the methods. There was no single computational tool that contained the entire set of functions necessary to achieve the goal. Conclusion: The fusion of the images from the three methods proved to be feasible with the use of four free-access software programs (OsiriX, Register, MRIcro and FSL). Our results may serve as a basis for building software that will be useful as a virtual tool prior to neurosurgery. (author)

  10. Analysis of absorbed dose in cervical spine scanning by computerized tomography using simulator objects; Análise de dose absorvida em varreduras de coluna cervical por tomografia computadorizada utlizando objetos simuladores

    Energy Technology Data Exchange (ETDEWEB)

    Lyra, Maria Henriqueta Freire

    2015-07-01

    The Computed tomography (CT) has become an important diagnostic tool after the continued development of Multidetector CT (MDCT), which allows faster acquisition of images with better quality than the previous technology. However, there is an increased radiation exposure, especially in examinations that require more than one acquisition, as dynamic exams and enhancement studies in order to discriminate low contrast soft tissue injury from normal tissue. Cervical spine MDCT examinations are used for diagnosis of soft tissue and vascular changes, fractures, dysplasia and other diseases with instability, which guide the patient treatment and rehabilitation. This study aims at checking the absorbed dose range in the thyroid and other organs during MDCT scan of cervical spine, with and without bismuth thyroid shield. In this experiment a cervical spine MDCT scan was performed on anthropomorphic phantoms, from the occipital to the first thoracic vertebra, using a 64 and a 16 – channel CT scanners. Thermoluminescent dosimeters were used to obtain the absorbed dose in thyroid, lenses, magnum foramen and breasts of the phantom. The results show that the thyroid received the highest dose, 60.0 mGy, in the female phantom, according to the incidence of the primary X-ray beam. The absorbed doses in these tests showed significant differences in the evaluated organs, p value < 0.005, except for the magnum foramen and breasts. With the bismuth thyroid shield applied on the female phantom, the doses in the thyroid and in the lenses were reduced by 27% and 52%, respectively. On the other hand, a reduction of 23.3% in the thyroid and increasing of 49.0% in the lens were measured on the male phantom. (author)

  11. Dysgenesis of the corpus callosum and associated malformaaation{sup :} computed tomography and magnetic resonance imaging findings; Disgenesia do corpo caloso e mas-formacoes associadas: achados de tomografia computadorizada e ressonancia magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Montandon, Cristiano; Montandon Junior, Marcelo Eustaquio [Colegio Brasileiro de Radiologia e Diagnostico por Imagem (CBR), Sao Paulo, SP (Brazil); Ribeiro, Flavia Aparecida de Sousa; Lobo, Leonardo Valadares Barbosa; Teixeira, Kim-Ir-Sen Santos [Goias Univ., Goiania (Brazil). Hospital de Clinicas. Dept. de Diagnostico por Imagem e Anatomia Patologica]. E-mail: cabeca2@terra.com.br

    2003-10-01

    Callosal dysgenesis is a malformation of the corpus callosum with origins in the embryogenesis of the telencephalon. We reviewed the computed tomography and magnetic resonance imaging findings of 11 patients with callosal dysgenesis and one patient with normal corpus callosum associated with a lipoma. The patients were divided into three distinct groups: total agenesis (three patients), partial agenesis (six patients) and hypoplasia (two patients). Associated abnormalities were observed in nine patients, including Chiari II malformation (one patient), schizencephaly (one patient), interhemispheric cyst (two patients), Dandy-Walker cyst (one patient), nodular heterotopy (one patient) and lipoma of the corpus callosum (four patients). This paper presents a review that may contribute to the diagnosis of these disorders. (author)

  12. Avaliação morfológica e morfométrica da articulação umerorradioulnar em cães através de exames radiográficos e por tomografia computadorizada

    Directory of Open Access Journals (Sweden)

    Alessandra Sendyk-Grunkraut

    Full Text Available RESUMO: Este estudo teve como objetivo apresentar de forma detalhada dados morfológicos e morfométricos da articulação umerorradioulnar de cães de raça definida avaliados por meio de exames físicos, radiográficos e tomográficos. A amostra dessa pesquisa constituiu-se de 44 cotovelos de cães com idades variadas. Para análise de informações obtidas, o coeficiente kappa e de correlação interclasse e associação foram realizados. Constatou-se que o desempenho individual de cada projeção radiográfica teve pobre concordância com o exame tomográfico; não houve concordância entre os observadores para as mensurações do ângulo da incisura ulnar ao exame radiográfico e tomográfico. Porém houve boa/moderada concordância para mensuração da incongruência radioulnar no plano sagital entre os observadores. Concluiu-se que nenhuma das cinco incidências radiográficas foi superior para análise radiográfica, uma vez que cada projeção apresentou melhor identificação de um compartimento do cotovelo. Medidas ao exame tomográfico para incongruência radioulnar não apresentaram reprodutibilidade no plano de reconstrução frontal, entretanto no corte sagital apresentaram boa e moderada concordância entre os observadores e que a mensuração do ângulo da incisura ulnar não apresentou repetibilidade ao exame radiográfico e nem reprodutibilidade ao exame tomográfico. Esses resultados contribuem para melhor utilização de cada exame de acordo com a região a ser avaliada bem como ressaltam a necessidade da somatória de múltiplos exames de imagem para a correta avaliação desta afecção.

  13. Cardiac tamponade in an infant during contrast infusion through central venous catheter for chest computed tomography; Tamponamento cardiaco durante infusao de contraste em acesso venoso central para realizacao de tomografia computadorizada do torax em lactente

    Energy Technology Data Exchange (ETDEWEB)

    Daud, Danilo Felix; Campos, Marcos Menezes Freitas de; Fleury Neto, Augusto de Padua [Hospital Geral de Palmas, TO (Brazil)

    2013-11-15

    Complications from central venous catheterization include infectious conditions, pneumothorax, hemothorax and venous thrombosis. Pericardial effusion with cardiac tamponade hardly occurs, and in infants is generally caused by umbilical catheterization. The authors describe the case of cardiac tamponade occurred in an infant during chest computed tomography with contrast infusion through a central venous catheter inserted into the right internal jugular vein. (author)

  14. Elementary representative sizes of soil attributes via attenuation of gamma rays and computerized tomography; Tamanhos elementares representativos de atributos do solo via atenuacao de raios gama e tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Jaqueline Aparecida Ribaski

    2015-07-01

    In this study, the Computed Tomography (CT) and gamma-ray attenuation (GRA) techniques were used in the investigation of representative sample sizes for attributes related to soil structure. First of all, the representative elementary length (REL) for experimental measurements of soil mass attenuation coefficient (μes), of samples from a sandy and a clayey soil, was analyzed. The study was conducted with two radioactive sources ({sup 241}Am and {sup 137}Cs), three collimators (2 - 4 mm diameters), and 14 thickness (x) samples (2-5 cm). From these analyzes, it was possible to identify an ideal thickness range for each of the studied sources (2-4 cm and 12-15 cm for the sources of {sup 241}Am and {sup 137}Cs, respectively). The application of such results in representative elementary area evaluations, in clayey soil clods via CT, indicated that experimental soil mass attenuation coefficient average values obtained for x>4 cm and source {sup 241}Am might induce the use of samples which are not large enough for soil bulk density evaluations. Subsequently, μCT images with a total volume of 39×39×33 mm{sup 3} and spatial resolution of 60 μm were used for macroporous system morphological characterization of a Rhodic Ferralsol with clayey texture, under no-till (NT) and conventional till (CT) systems. Attributes as macroporosity (MAP), number of macropores (NMAP), tortuosity (τ) and connectivity (C) of the pores were assessed. The C degree was estimated based on the Euler-Poincare characteristic (EPC). Once 3D images enable the study of these attributes in different sample volumes, the proposed study is ideal for the analysis of representative elementary volume (REV). Usually, the selection of subvolumes for REV analysis occurs concentrically to a small volume or in adjacent positions. Here, we introduced a new method for selecting the positions of subvolumes, which are randomly chosen within the total image volume (random selection). It was observed that higher fluctuations in amplitude of each analyzed property values occurred for smaller subvolumes and random selection. When these positions are randomly selected, all regions of the sample have the same probability of occurrence. Thus, the subvolumes can be selected from regions that exhibit similar characteristics, or which are quite different from each other. The results allowed the study of each of these attributes in function of the analyzed sample volume. Such analysis enabled the identification of a REV for MAP and τ measurements for both soils. However, NMAP and CEP showed no indication of stabilization within the total sample volume analyzed (39×39×33 mm{sup 3}). From this study, it was possible to detect the influence of each management systems (NT and CT) on the macroporous system. In general, results obtained for soil under PC showed higher regularity, which is probably due to its homogenization induced by the plowing, conducted twice a year. (author)

  15. Radiological protection for multislice computed tomography in pregnant women in the supplementary diagnosis of fetal Thanatophoric dysplasia; Cuidados com protecao radiologica durante tomografia computadorizada multslice em gestante no diagnostico complementar de displasia tanatoforica fetal

    Energy Technology Data Exchange (ETDEWEB)

    Castro, Jose Thiago de Souza de; Lima, Rogerio Aparecido; Ferreira, Josias dos Santos, E-mail: jthiagoc@hc.unicamp.br, E-mail: rxroger@hc.unicamp.br, E-mail: josiasrx@hotmail.com [Universidade Estadual de Campinas (HC/UNICAMP), SP (Brazil). Hospital de Clinicas. Dept. de Radiologia

    2014-07-01

    Thanatophoric Dysplasia is a rare genetic disorder that leads to the normal growth of the individual leaving him with short stature deterrent. Patients with this syndrome have disproportionately short limbs, with extra skin folds, narrowing chest, small ribs, underdeveloped lungs and hydrocephalus. The Thanatophoric Dysplasia can be diagnosed by ultrasonography (US), with approximately 23 weeks of gestation. If there is suspicion of a lethal skeletal dysplasia CT with 3D reconstruction can be suggested. In the use of CT Multslice 3D for prenatal diagnosis of Thanatophoric Dysplasia, one should take into account the radiation dose. To reduce the radiation dose in the pregnant woman and her fetus, it is possible to employ a chain of smaller pipe without compromising the picture quality through automatic exposure control (AEC) which is based on the principle of CT Multslice. AEC Such systems are designed to adjust the tube current according to the patients shape, size, and attenuation of X-rays. One study compared the use of 2D-US and 3D-CT completion is lower cost and the absence of radiation in the US, the method is dependent on the volume of amniotic fluid and fetal position. The 3D-CT can demonstrate all fetal skeleton. The 2D US provided correct diagnosis in four of the six cases studied, while 3D-CT yielded the correct diagnosis in all six cases. (author)

  16. Computed tomography findings in closed obstruction of the small bowel associated with rupture of the cecum - a case report; Obstrucao em alca fechada com ruptura do ceco: aspectos na tomografia computadorizada - relato de um caso

    Energy Technology Data Exchange (ETDEWEB)

    Crespo, Sheila Jandhyra Vianna; Mendes, Luis Fernando [Instituto Nacional do Cancer (INCa), Rio de Janeiro, RJ (Brazil); Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia

    2001-06-01

    Closed loop obstruction of the bowel is an extremely grave condition that may lead to serious consequences and even be fatal. The authors describe a case of a patient with intestinal obstruction secondary to cancer of the sigmoid and highlight the importance of computed tomography in the analysis of the pathological changes in routine management of patients with acute abdomen. (author)

  17. Study of noise sources of image for optimization of radiation doses in skull computerized tomography; Estudo das fontes de ruido da imagem para fins de otimizacao das doses na tomografia computadorizada de cranio

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, R.B.; Garos, K.A.C. [UNIFESP - Universidade Federal de Sao Paulo, SP (Brazil)]. E-mail: rbitelli@cfrh.epm.br

    2001-07-01

    Our goal was to evaluate the exposure factors that can change the image noise of head CT in different slices thicknesses. We have evaluated the images noise at several mAs varying from 50 to 800 mAs for 100, 120 and 140 kVp as tension values. The images uniformity were determined for all technical exposure conditions. We did not observed any important noise reduction for values up 200 mAs which can justify the increase of radiation doses through the increase of mAs. (author)

  18. Halo sign nodules in angio invasive pulmonary aspergillosis: correlation of high-resolution computed tomography findings with anatomopathology; Nodulos com sinal do halo na aspergilose pulmonar angioinvasiva: correlacao da tomografia computadorizada de alta resolucao com a anatomopatologia

    Energy Technology Data Exchange (ETDEWEB)

    Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Valiante, Paulo Marcos [Universidade Federal, Rio de Janeiro, RJ (Brazil). Dept. de Patologia; Souza Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Disciplina de Radiologia

    2002-08-01

    The aim of this study was to correlate the early findings observed on high-resolution computed tomography with anatomopathology results of patients with angio invasive aspergillosis. The authors studied two patients with leukemia. The nodules seen on high-resolution computed tomography corresponded to areas of hemorrhagic infarction, necrotic coagulation and fungal hyphae infiltration whereas ground glass halo corresponded to intra alveolar hemorrhage. Nodules with halo sign were closely correlated with anatomopathology findings. We concluded that the anatomopathology findings can clearly explain the image features of the lesions observed on high-resolution computed tomography. (author)

  19. Ground-glass opacity in diffuse lung diseases: high-resolution computed tomography-pathology correlation; Opacidades em vidro fosco nas doencas pulmonares difusas: correlacao da tomografia computadorizada de alta resolucao com a anatomopatologia

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Maria Lucia de Oliveira; Vianna, Alberto Domingues; Marchiori, Edson [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Radiologia; Souza Junior, Arthur Soares [Faculdade de Medicina de Sao Jose do Rio Preto (FAMERP), SP (Brazil). Disciplina de Radiologia; Moraes, Heleno Pinto de [Universidade Federal Fluminense, Niteroi, RJ (Brazil). Dept. de Patologia]. E-mail: edmarchiori@zipmail.com.br

    2003-12-01

    Ground-glass opacity is a finding frequently seen in high-resolution computed tomography examinations of the chest and is characterized by hazy increased attenuation of lung, however without blurring of bronchial and vascular margins. Due to its un specificity, association with other radiological, clinical and pathological findings must be considered for an accurate diagnostic interpretation. In this paper were reviewed 62 computed tomography examinations of patients with diffuse pulmonary diseases of 14 different etiologies in which ground-glass opacity was the only or the most remarkable finding, and correlated this findings with pathology abnormalities seen on specimens obtained from biopsies or necropsies. In pneumocystosis, ground-glass opacities correlated histologically with alveolar occupation by a foaming material containing parasites, in bronchiole alveolar cell carcinoma with thickening of the alveolar septa and occupation of the lumen by mucus and tumoral cells, in paracoccidioidomycosis with thickening of the alveolar septa, areas of fibrosis and alveolar bronchopneumonia exudate, in sarcoidosis with fibrosis or clustering of granulomas and in idiopathic pulmonary fibrosis with alveolar septa thickening due to fibrosis. Alveolar occupation by blood was found in cases of leptospirosis, idiopathic hemo siderosis, metastatic kidney tumor and invasive aspergillosis whereas oily vacuole were seen in lipoid pneumonia, proteinaceous and lipo proteinaceous material in silico proteinosis and pulmonary alveolar proteinosis, and edematous fluid in cardiac failure. (author)

  20. Development of a pediatric chest phantom for dosimetry in computerized tomography; Desenvolvimento de objeto simulador de tórax pediátrico para dosimetria em tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Aburjaile, W.N.; Mourão, A.P., E-mail: wadia.namen@gmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Engenharia Nuclear; Oliveira, F.A. [Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG), Belo Horizonte, MG (Brazil). Centro de Engenharia Biomédica

    2017-07-01

    Computed Tomography (CT) has promoted a significant increase in the dose absorbed by patients due to the diagnosis. Therefore, it is indispensable to improve protocols, using smaller doses, without impairing the diagnostic quality of the image. The risks of stochastic effects are greater for children due to tissue radiosensitivity coupled with longer life expectancy. In the work, a cylindrical simulator was used, representing an adult thorax, made of polymethylmethacrylate, and a second simulator object of the same material was developed in oblong format including the axillary regions based on the dimensions of the pediatric patient's 8-year-old chest. A comparative study was performed between chest scans performed on two CT equipment in different radiodiagnostic services. The central slice of the two simulating objects was irradiated successively and, using a pencil-type ionization chamber, the absorbed dose was measured at five different points of each simulating object. From the measurements, weighted Dose and Volumetric Dose Index (CK, PMMA, vol) values were obtained for the 10 cm sweep of the central region of the object, in helical mode. The scans were performed using the chest acquisition protocols used by radiodiagnostic services, both for a supply voltage of the 120 kV X-ray tube. The study allowed to compare the variation of absorbed dose between patients with distinct chest volumes and the patient dose variation between two devices when used for the generation of images with the same diagnostic objective.

  1. Proposal of recommendations for quality control in computerized tomography, with emphasis in new technologies; Proposta de um protocolo de controle de qualidade em tomografia computadorizada, com enfase nas novas tecnologias

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Marlon da Silva Brandao; Neves, Camila Nascimento das

    2016-11-01

    The use of computed tomography (CT) has continuously grown over the years and expanding its applications in different medical procedures. As a result, there was an increase of frequency and in collective dose. One of the strategies to maximize the benefits of this important imaging modality is the implementation of optimization of protection programs. As part of this process, a quality control should be established to ensure the correct performance of the scanner. Quality control protocols can be very useful to carry out all tests in a standard methodology and well-established tolerance values. However, to keep up with the constant advances in technology, these protocols must be constantly reviewed and updated to allow its application in different existing models. The objective of this work is to develop a quality control protocol based on international recommendations and in national standards. (author)

  2. Dipyridamole stress myocardial perfusion by computed tomography in patients with left bundle branch block; Perfusao miocardica de estresse com dipiridamol por tomografia computadorizada em pacientes com bloqueio de ramo esquerdo

    Energy Technology Data Exchange (ETDEWEB)

    Cabeda, Estevan Vieira; Rochitte, Carlos Eduardo; Nomura, Cesar Higa; Parga, Jose Rodrigues; Avila, Luiz Francisco Rodrigues; Falcao, Andrea Maria Gomes; Soares Junior, Jose [Instituto do Coracao (InCor), Universidade de Sao Paulo (USP), Sao Paulo, SP (Brazil)

    2015-12-15

    Background: Functional tests have limited accuracy for identifying myocardial ischemia in patients with left bundle branch block (LBBB). Objective: To assess the diagnostic accuracy of dipyridamole-stress myocardial computed tomography perfusion (CTP) by 320-detector CT in patients with LBBB using invasive quantitative coronary angiography (QCA) (stenosis ≥ 70%) as reference; to investigate the advantage of adding CTP to coronary computed tomography angiography (CTA) and compare the results with those of single photon emission computed tomography (SPECT) myocardial perfusion scintigraphy. Methods: Thirty patients with LBBB who had undergone SPECT for the investigation of coronary artery disease were referred for stress tomography. Independent examiners performed per-patient and per-coronary territory assessments. All patients gave written informed consent to participate in the study that was approved by the institution's ethics committee. Results: The patients' mean age was 62 ± 10 years. The mean dose of radiation for the tomography protocol was 9.3 ± 4.6 mSv. With regard to CTP, the per-patient values for sensitivity, specificity, positive and negative predictive values, and accuracy were 86%, 81%, 80%, 87%, and 83%, respectively (p = 0.001). The per-territory values were 63%, 86%, 65%, 84%, and 79%, respectively (p < 0.001). In both analyses, the addition of CTP to CTA achieved higher diagnostic accuracy for detecting myocardial ischemia than SPECT (p < 0.001). Conclusion: The use of the stress tomography protocol is feasible and has good diagnostic accuracy for assessing myocardial ischemia in patients with LBBB. (author)

  3. Descrição anatômica das estruturas osteoarticulares do esqueleto axial do tatu-galinha (Dasypus novemcinctus Linnaeus, 1758) por meio da radiografia e tomografia computadorizada

    OpenAIRE

    Alves, Lidiane da Silva [UNESP

    2016-01-01

    O tatu-galinha é um dos animais mais populosos da ordem Xenarthra com distribuição do sul dos Estados Unidos até a América do Sul. São animais frequentemente caçados e, em muitos casos, são vítimas de atropelamentos rodoviários. Existem diversos estudos descritivos sobre a fisiologia, a genética e o comportamento, porém a anatomia óssea e articular destes animais ainda é restrita. Este estudo tem por objetivo, descrever a anatomia das estruturas osteoarticulares do esqueleto axial em 20 tatus...

  4. Dosimetric evaluation of cone beam computed tomography scanning protocols; Avaliação dosimétrica de protocolos de exame de tomografia computadorizada de feixe cônico

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Maria Rosangela

    2015-07-01

    It was evaluated the cone beam computed tomography, CBCT scanning protocols, that was introduced in dental radiology at the end of the 1990's, and quickly became a fundamental examination for various procedures. Its main characteristic, the difference of medical CT is the beam shape. This study aimed to calculate the absorbed dose in eight tissues / organs of the head and neck, and to estimate the effective dose in 13 protocols and two techniques (stitched FOV e single FOV) of 5 equipment of different manufacturers of cone beam CT. For that purpose, a female anthropomorphic phantom was used, representing a default woman, in which were inserted thermoluminescent dosimeters at several points, representing organs / tissues with weighting values presented in the standard ICRP 103. The results were evaluated by comparing the dose according to the purpose of the tomographic image. Among the results, there is a difference up to 325% in the effective dose in relation to protocols with the same image goal. In relation to the image acquisition technique, the stitched FOV technique resulted in an effective dose of 5.3 times greater than the single FOV technique for protocols with the same image goal. In the individual contribution, the salivary glands are responsible for 31% of the effective dose in CT exams. The remaining tissues have also a significant contribution, 36%. The results drew attention to the need of estimating the effective dose in different equipment and protocols of the market, besides the knowledge of the radiation parameters and equipment manufacturing engineering to obtain the image. (author)

  5. Bioelectrical impedance and visceral fat: a comparison with computed tomography in adults and elderly; Bioimpedancia eletrica e gordura visceral: uma comparacao com a tomografia computadorizada em adultos e idosos

    Energy Technology Data Exchange (ETDEWEB)

    Eickemberg, Michaela [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Roriz, Anna Karla Carneiro [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Fontes, Gardenia Abreu Vieira [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Sampaio, Lilian Ramos [Universidade Federal de Sao Paulo (Unifesp), Sao Paulo, SP (Brazil)

    2013-05-01

    Objective: To evaluate the association between electrical bioimpedance analysis (BIA) and visceral fat (VF) in adult and elderly patients. Subjects and methods: This was a cross-sectional study, with a sample of 191 subjects (52% women, 49% elderly) stratified by sex, age and body mass. Computerized tomography (VF area) and BIA (percentage of total body fat (%TBF-BIA), phase angle, reactance and resistance) data were generated. Statistical analysis was based on Pearson's Correlation Coefficient, Anova, Pearson's Chi-square, and ROC curves. Results: VF areas {>=} 130 cm{sup 2} were more prevalent among the elderly and among men. Adult females showed a stronger correlation between GV and %TBF-BIA. The other groups showed similar results and statistically significant correlations. Correlations between GV and phase angle were weak and not statistically significant. ROC Curves analyzes showed the following %TBF-BIA, which identified excess VF: for male subjects: 21.5% (adults) and 24.25% (elderly); for female subjects: 35.05% (adults) and 38.45% (elderly) with sensitivity of 78.6%, 82.1%, 83.3%, and 66.7%, and specificity of 70.6%, 62.5%, 79.1%, and 69%, respectively. Conclusion: BIA was found to have satisfactory sensitivity and specificity to predict VF; however, other devices and other techniques should be investigated to improve VF prediction. (author)

  6. Preliminary evaluation of exposures of computerized tomography patients in Latin America: IAEA project RLA/9/67; Avaliacao preliminar das exposicoes de pacientes em tomografia computadorizada na America Latina: Projeto IAEA RLA/9/67

    Energy Technology Data Exchange (ETDEWEB)

    Kodlulovich, S.; Silveira, V. [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil); Khoury, H.J. [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Departamcnto de Energia Nuclear; and others

    2013-07-01

    The aim of this study was to obtain preliminary values of reference levels in CT . Were sent to each country forms with information of radiological protection and routine CT protocols. The CT dose index and absorbed dose to organs was estimated from the technical data for each equipment . The results showed that the total number of examinations performed 92 % are adult patients and 8 % are children. The most frequent examination of the skull was adult (40 % ) and abdomen for children (42 % ) . About the service , 67 % of the equipment are multicut and 76 % have specific protocols for pediatric patients. The CTDI{sub vol} values for head exams of adults vary between 2 and 352 mGy for pediatric patients under 1 year 1-191 mGy under 7 years old 5-335 mGy. For chest values ranged from 3 to 26 mGy for adults, between 1 and 89 mGy for children under 1 year and between 3-114 mGy for children between 1 and 7 years. Exams of the abdomen/pelvis of adults the range was 3-47 mGy , between 4-90 mGy for children under 1 year and between 2-31 mGy for children between 1 and 7 years. This study showed that although there are pediatric protocols, there is a wide variation in values of CTDl{sub vol} indicating a high potential for dose reduction. This result requires immediate action for optimization and implementation of diagnostic reference values in Latin America.

  7. Bioelectrical impedance and visceral fat: a comparison with computed tomography in adults and elderly; Bioimpedancia eletrica e gordura visceral: uma comparacao com a tomografia computadorizada em adultos e idosos

    Energy Technology Data Exchange (ETDEWEB)

    Eickemberg, Michaela [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Roriz, Anna Karla Carneiro [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Fontes, Gardenia Abreu Vieira [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil); Sampaio, Lilian Ramos [Universidade Federal de Sao Paulo (Unifesp), Sao Paulo, SP (Brazil)

    2013-05-01

    Objective: To evaluate the association between electrical bioimpedance analysis (BIA) and visceral fat (VF) in adult and elderly patients. Subjects and methods: This was a cross-sectional study, with a sample of 191 subjects (52% women, 49% elderly) stratified by sex, age and body mass. Computerized tomography (VF area) and BIA (percentage of total body fat (%TBF-BIA), phase angle, reactance and resistance) data were generated. Statistical analysis was based on Pearson's Correlation Coefficient, Anova, Pearson's Chi-square, and ROC curves. Results: VF areas {>=} 130 cm{sup 2} were more prevalent among the elderly and among men. Adult females showed a stronger correlation between GV and %TBF-BIA. The other groups showed similar results and statistically significant correlations. Correlations between GV and phase angle were weak and not statistically significant. ROC Curves analyzes showed the following %TBF-BIA, which identified excess VF: for male subjects: 21.5% (adults) and 24.25% (elderly); for female subjects: 35.05% (adults) and 38.45% (elderly) with sensitivity of 78.6%, 82.1%, 83.3%, and 66.7%, and specificity of 70.6%, 62.5%, 79.1%, and 69%, respectively. Conclusion: BIA was found to have satisfactory sensitivity and specificity to predict VF; however, other devices and other techniques should be investigated to improve VF prediction. (author)

  8. Comparative analysis of quality control tests on computed tomography in accordance with national and international laws; Analise comparativa dos testes de controle de qualidade em tomografia computadorizada de acordo com as legislacoes nacional e internacional

    Energy Technology Data Exchange (ETDEWEB)

    Ramos, Fernando S.; Vasconcelos, Rebeca S.; Goncalves, Marcel S.; Oliveira, Marcus V.L. de, E-mail: fernando_siramos@hotmail.com, E-mail: marcusradiology@gmail.com [Instituto Federal da Bahia (IFBA), Salvador, BA (Brazil)

    2014-07-01

    The objective of this study is to perform a comparative analysis between the Brazilian legislation and internationals protocols, with respect to the quality control tests for computerized tomography. We used 07 references, published from 1998-2012: the Protocolo Brasileiro - Portaria 453/98 SVS/MS and the Guia de Radiodiagnostico Medico da ANVISA; Quality Assurance Programme for Computed Tomography: Diagnostic and Therapy Applications of the IAEA; European Protocol - European Guidelines on Quality Criteria for Computed Tomography of the EUR No. 16262 EN; Radiation Protection No. 162 - Criteria for Acceptability of Medical Radiology, Nuclear Medicine and Radiotherapy of the European Commission; the Protocols of Control de Calidad en Radiodiagnostico IAEA / ARCAL XLIX; and the Protocolo Espanol de Control de Calidad en Radiodignostico. The comparative analysis of these legislations was based on aspects of tolerance / limit, frequency and objectives of the recommended tests. Were found 18 tests in the Brazilian legislation. The tests were grouped according to their nature (dosimetric tests / exposure and geometric tests and image quality tests). Among the evaluated protocols was identified divergence between tests contained in the documents and the criteria of assessment set out in this work. It is clear, moreover, that for certain documents are not observed tolerances, well-defined methodologies and even frequency of testing. We conclude that the current legislation in Brazil differs in certain respects from international protocols analyzed, although this has a great numbers of quality control tests. However, it is necessary that the Brazilian legislation takes into account technological advances presented to time.

  9. Diagnosis of chronic rhino sinusitis in patients with cystic fibrosis: correlation between anamnesis, nasal endoscopy and computed tomography; Diagnostico de rinossinusite cronica em pacientes com fibrose cistica: correlacao entre anamnese, nasofibroscopia e tomografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Boari, Leticia; Castro Junior, Ney Penteado de [Faculdade de Ciencias Medicas da Santa Casa de Sao Paulo, SP (Brazil)]. E-mail: curyboari@uol.com.br

    2005-11-15

    The sinonasal involvement is one of the most common manifestations in cystic fibrosis. Data show a high incidence of chronic rhino sinusitis in these patients. Although it has been found radiographic opacification of the sinus in more than 90% of cases, few are symptomatic. So that, it is difficult to recognize nasossinusal disease in patients with cystic fibrosis. Questionnaire, nasal endoscopy and CT-scan are very important methods in this approach. Aim: to evaluate the diagnosis of chronic rhino sinusitis in patients with cystic fibrosis by anamnesis, nasal endoscopy and CT-scan and compare those results.Study Design: Clinical prospective. Material and method: evaluation of 34 patients - older than 6 years and with a confirmed diagnoses of cystic fibrosis - by anamnesis (questionnaire), nasal endoscopy (score Lund-Kennedy) and CT-scan (score Lund-Mackay). Results: chronic rhino sinusitis was confirmed in: 20,58% of cases by the questionnaire, 73,52% of the cases by the nasal endoscopy and in 93,54% of the cases by the CT-scan. The results showed significant differences. The correlation between nasal endoscopy score (Lund-Kennedy score) and CT-scan score (Lund-Mackay score) was statistically significant. Conclusion: the diagnosis of chronic rhino sinusitis was statistically different between the three methods. It was higher in imaging analysis and lower in questionnaire. The nasal endoscopy is an excellent method to evaluate nasossinusal disease in cystic fibrosis. (author)

  10. Evaluation of X ray radiation doses in pediatric examinations of cranial computerized tomography based on optimization studies; Avaliacao das doses de radiacao X em exames pediatricos de tomografia computadorizada de cranio com base em estudos de otimizacao

    Energy Technology Data Exchange (ETDEWEB)

    Daros, Kellen Adriana Curci

    2005-07-01

    This paper identifies the technical conditions for CT examination which offers lowest absorbed dose and to attend the manufacturer recommendations as far the spatial resolution is concerned. The paper evaluates the absorbed dose during cranial CT in up to 6 years children satisfying the technical condition recommended by the manufacturer and routine clinical conditions. The paper also established a quantitative relationship among the absorbed dose and its distribution in the cranial regions of pediatric patients up to 6 years old in a way to estimate the doses subject to optimized conditions

  11. Image quality and volume computed tomography air kerma index (C{sub vol}) evaluation in Recife; Avaliacao da qualidade de imagem e do indice volumetrico de Kerma ar em tomografia computadorizada (C{sub vol}) em Recife

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, Marcos Ely Almeida

    2008-07-01

    The Computed Tomography (CT) is an important diagnostic imaging method, widely used. However, in spite of all the advantages and technologic advances within the CT scanners, the tomographic procedures result in high absorbed doses to patients. The main objective of this work was to perform a dosimetric study of CT scanners located at Recife and to evaluate the image quality on CT examinations in these equipment. The volume CT air kerma index (C{sub VOL}) and air kerma length product (P{sub KL,CT}) were estimated. These values were calculated using normalized weighted air kerma indexes in CT standard dosimetry phantoms ({sub n}C{sub W}), supplied by ImPACT group for several CT scanners, and the scan parameters of routine head, routine chest and hi-resolution chest CT exams performed at 20 institutions. The irradiation parameters of 15 adult patients for each CT procedure were registered at six participating centres, at which the phantom from the American College of Radiology (ACR) CT accreditation protocol was used for the image quality measurements. For routine head exams, the C{sub VOL} values varied between 12 and 58 mGy (at the posterior fossa) and 15 to 58 mGy (at the cerebrum) and the P{sub KL,CT}, from 150 to 750 mGy{center_dot}cm. The C{sub VOL} values for routine chest procedures varied from 3 to 26 mGy and the P{sub KL,CT}, between 120 and 460 mGy{center_dot}cm. In relation to Hi-resolution chest exams, C{sub VOL} values were from 1.0 to 2.7 mGy and the P{sub KL,CT} values varied between 24 and 67 mGy{center_dot}cm. The image quality evaluations results showed that almost all scanners presented at least one inadequacy. One of the equipment presented faults at 70% of the tests. With regard to the image noise, only two scanners presented acceptable results. From these results, it is possible to conclude that the volume CT air kerma index values are lower than the European reference levels. However, the image quality of these CT scanners does not attend the ACR requirements, suggesting the need to implement quality assurance programs at the evaluated institutions. (author)

  12. Muscle areas of lower limbs were determined by anthropometric and computed tomography in the adult of the masculine sex; Areas musculares del muslo y la pierna estimadas por antropometria y tomografia axial computadorizada en varones adultos

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez Vieitez, Jorge Alberto; Alvarez Cuesta, Jose Alberto; Williams Wilson, Luis [Centro Provincial de Medicina del Deporte, Holguin (Cuba)

    2000-07-01

    In a sample of 17 males (age 26 {sup +}{sub -} 5 years; weight 76.3 {sup +}{sub -} 7.1 kg and height 177.2 {sup +}{sub -} 3.9 cm) the differences, ratios and interchangeability among muscle areas (cm{sup 2}) of lower limbs (medial thigh and maximum leg) were determined by anthropometric (muscle area= [limb circumference (cm)- 0.31416 skinfold (mm)]2 /12.5664 and computed tomography. The anthropometric method overestimated muscle areas in both regions (thigh + 9.0 {sup +}{sub -} 12.8; p= 0.01 and leg: +8.5 {sup +}{sub -} 11.2; p=0.006). Relation between the two procedures was statistically significant (thigh r=0.9; p= 8.8 .10-7 and leg r=0.52; p=0.03). Both methods were interchangeable since neither the correlation coefficient (thigh r=0.42; leg r=0.38) nor the regression gradient (thigh b {sub {sub 0.21}} {sup +}{sub -} 0.12; leg b = -0.44{sup +}{sub -} 0.28) between the differences (anthropometric ? TAC) and the averages (anthropometric + TAC/ 2) in both methods were statistically significant (p>0.05). It was concluded that the anthropometric method requires certain adjustments to be able to estimate more accurately the muscle areas of lower limbs.

  13. Avaliação da anatomia de molares decíduos por meio de microtomografia computadorizada

    OpenAIRE

    Ana Caroline Fumes

    2013-01-01

    O conhecimento prévio da anatomia interna e externa dos dentes decíduos é de fundamental importância para o sucesso do tratamento endodôntico. O objetivo do presente estudo foi analisar a morfologia das raízes e dos canais radiculares de molares decíduos superiores e inferiores, por meio de microtomografia computadorizada (micro-CT). Foram usados 40 molares decíduos, divididos em quatro grupos, sendo 10 primeiros molares inferiores, 10 segundos molares inferiores, 10 primeiros molares superio...

  14. Effect of milking efficiency on Tc-99 content of Tc-99m derived from Tc-99m generators

    International Nuclear Information System (INIS)

    Bonnyman, J.

    1983-01-01

    Tc-99m obtained by separation from its parent Mo-99 always contains Tc-99 produced by decay of Tc-99m and Mo-99. Factors effecting the Tc-99/Tc-99m ratios are discussed. An HPLC method has been developed to measure the 99 TcO 4- content of sodium pertechnetate from generators with a detection limit of 0.9 ng Tc-99 for a 500 μl/ aliquot of TcO 4- -99m. First eluates of 10 chromatograph-ic generators gave Tc-99/Tc-99m ratios ranging from 3.5-46 ng Tc/mCi Tc-99m measured at the time of milking. The measurements indicate that Tc-99/Tc-99m ratios high enough to cause adverse labelling effects could be found in 'instant pertechnetate' and in the first eluate from Tc-99m generators for the activities normally used in radiopharmaceutical production

  15. Complicações respiratórias em pacientes com paralisia cerebral submetidos à anestesia geral

    OpenAIRE

    Mello, Sérgio Silva de; Marques, Ronaldo Soares; Saraiva, Renato Ângelo

    2007-01-01

    JUSTIFICATIVA E OBJETIVOS: Anestesia em pacientes com paralisia cerebral (PC) pode representar um desafio para o anestesiologista. Este estudo prospectivo teve como objetivo determinar a prevalência e o risco de complicações respiratórias em crianças com PC submetidas à anestesia geral inalatória (AGI) para tomografia computadorizada (TC). MÉTODO: Participaram do estudo pacientes com idades entre 1 e 17 anos, estado físico ASA I a III, submetidos a AGI com sevoflurano e máscara laríngea para ...

  16. Program standard of quality control for a system of Positron Emission Tomography-computed tomography (PET-CT) used in the Foundation Valle de Lili; Programa estandar de control de calidad para un sistema de tomografia por emision de positrones-tomografia computadorizada (PET-CT) utilizado en la Fundacion Valle del Lili

    Energy Technology Data Exchange (ETDEWEB)

    Nunez, Nathalia I.; Benavides, Sivor O., E-mail: Nnunez@fcvl.org, E-mail: Obenavides@fcvl.org [Fundacion Valle del Lili (OFM-PR/FVL), Cali (Colombia). Dept. de Fisica Medica y Proteccion Radiologica; Lopera, Wilson, E-mail: wilson.lopera@correounivalle.edu.co [Universidad del Valle, Cali (Colombia). Dept. de Fisica

    2013-07-01

    A standard protocol of quality control in the Fundacion Valle del Lili for the implementation of a multimodal scanner developed emission tomography BIOGRAPH mCT X-3R of SIEMENS Registered-Sign covering routine testing, frequency, acceptance ranges necessary corrective and preventive measures to detect and correct any faults and proceed if the upper detection precision and accuracy ranges accepted deviations actions. In order to minimize errors in the planning and management of patient dose, thereby improving the quality of the diagnostic image with the dose of radiation is reasonably low as possible, consistent with the clinical use of the equipment used and the information requested diagnostic study.

  17. 93Tc and sup(93m)Tc gamma spectra

    International Nuclear Information System (INIS)

    Podkopaev, Yu.N.; Zarubin, P.P.; Kobelev, V.F.; Padalko, V.Yu.; Khrisanfov, Yu.V.

    1977-01-01

    The sup(93,93m)Tc decay was studied. The spectra of γ-rays accompanying the decay of this nuclide were studied. 93 Tc and sup(93m)Tc were obtained in the (dn)-reaction on 92 Mo. To ensure a more reliable identification of γ-rays, the isotopic composition of the targets, the bombardment time, the energy of the bombarding deuterons (5-12 MeV) and the spectrum processing program were varied. The energies and relative intensities of the γ-rays of the 93 Tc and sup(93m)Tc decay are listed in tables together with data of other investigatxons. The results obtained largely confirm the known data. Four new transitions were added in the sup(93m)Tc spectrum namely 1046.8, 2011.8, 2182.0, and 2861.5 keV. The 2739.0 keV transition was eliminated from the 93 Tc spectrum. The appropriate changes and additions were made in the 93 Tc decay scheme, and three new levels were introduced: 2479.0, 2821.7, and 3025.8 keV. The values of log ft of some levels of 93 Tc were estimated

  18. Avaliação da simetria craniana através de imagens de TC cone beam = Cranial symmetry assessment through cone-beam CT images

    Directory of Open Access Journals (Sweden)

    Vilella, Oswaldo de Vasconcellos

    2014-01-01

    Full Text Available Objetivo: O objetivo do presente estudo foi comparar os lados direito e esquerdo de indivíduos que apresentavam simetria craniana através de 2 imagens geradas pela tomografia computadorizada cone beam (TCCB. Métodos: A amostra consistiu de 35 imagens obtidas pelo tomógrafo 3D-i-CAT (Imaging Sciences International Inc. , Hatfield, USA, sendo 13 de indivíduos do gênero masculino e 22 do gênero feminino, com idades variando de 8 a 64 anos, que apresentavam simetria facial aceitável. As imagens foram manipuladas com a ajuda do programa invivodental 5. 0 (Anatomage, San Jose, USA e posicionadas de forma análoga à postura da cabeça para a obtenção da radiografia cefalométrica de perfil. As distâncias lineares Go-Me, Go-Cd, S-Cd, Co-Gn e Co-A (mm; os ângulos mego. Cd, FMA e gogn. SN (graus, e cinco distâncias lineares côndilo-fossa glenóide foram as variáveis analisadas. Resultados: Uma diferença estatística significante entre os lados foi encontrada apenas para a variável S-Cd (mm. Conclusão: Portanto, não há necessidade de se obter valores bilaterais para essas variáveis (exceto S-Cd para avaliar o crânio de indivíduos sem assimetrias evidentes. Com relação à variável S-Cd, a dificuldade para se marcar o ponto S (sela nu

  19. Suburban amoebiasis. CT and US findings and percutaneous treatment of amoebic liver abscess; Amebiasi sub-urbana: aspetti diagnostici con tomografia computerizzata ed ecografia e trattamento percutaneo degli ascessi amebici del fegato

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; De Rosa, A. [Ospedale Loreto Mare, Naples (Italy). Servizio di Radiologia; Rossi, E.; Carbone, M.; Mondillo, F. [Naples Univ. II, Naples (Italy).Dipt. di Scienze Biomorfologiche e Funzionali, Servizio di Diagnostica per Immagini; Tuccillo, M. [Azienda Ospedaliera di Rilievo Nazionale A. Cardarelli, Naples (Italy). Servizio di Radiologia; Capuano, N. [Ospedale Loreto Mare, Naples (Italy). Div. di Chirurgia; Nunziata, A. [Naples Univ. II, Naples (Italy). Ist. di Radiologia

    2000-03-01

    The study reports ultrasonography and computerise tomography findings in 16 patients with amoebic abscesses, 12 of whom lived in a temperate peripheral area north-east of Naples (Italy). All patients have a clinical-diagnostic condition called sub-urban amoebiasis. The personal experience with the US guided therapeutic drainage of amoebic abscess with repeated cavity washing, which is important for positive parasitology. Combined US and CT assessment facilitated the diagnosis of amoebiasis and its differentiation from pyogenic abscess and hepatoma. [Italian] La colonizzazione epatica rappresenta la localizzazione piu' comune dell'amebiasi extraintestinale e gli ascessi epatici ne costituiscono la manifestazione piu' frequente sviluppandosi nel 3-9 % dei pazienti affetti da infezione parassitaria. Diversi studi confermano che la terapia medica dell'amebiasi risulta piu' efficace quando viene associato il drenaggio percutaneo degli ascessi epatici con piu' rapida guarigione clinica e risposta favorevole dell'organismo. Scopo del presente lavoro e' di descrivere gli aspetti ecografici e di tomografia computerizzata degli ascessi amebici in un gruppo di 16 pazienti, 12 dei quali residenti in zona temperata e periferica di una vasta area a nord-est di Napoli presentandosi con caratteristico e raro quadro clinico-diagnostico definito amebiasi sub-urbana. Si discute infine l'esperienza personale del drenaggio terapeutico sotto guida ecografica dell'ascesso con tecnica del lavaggio ripetuto dalla cavita', importante ai fini della positivita' dell'esame. L'associazione dei reperti tipici ecografici e TC ha consentito la diagnosi agevole dell'amebiasi differenziandola dall'ascesso piogenico e dall'epatoma.

  20. Broncofibroscopia Flexível e Tomografia Helicoidal Computorizada no diagnóstico do Carcinoma Pulmonar Não de Peq uenas Células

    Directory of Open Access Journals (Sweden)

    Ram Cicero

    1998-11-01

    Full Text Available RESUMO: Actualmente a avaliação dos Tumores Pulmonares e as alterações intratorácicas provocadas pelos mesmos pode ser analisada por Tomografia Axial Computorizada e Tomografia Helicoidal Computorizada (THC.Parece haver uma correlação entre as imagens detectadas pela Tomografia Helicoidal Computorizada (THC e as alterações cndoscópicas encontradas por Broncofibroscopia Flexível (BFB.O objectivo deste trabalho foi demonstrar essa eventual correlação.Estudaram-se 18 doentes com Carcinoma do Pulmão Não de Pequenas Células (CPNPC. Houve uma boa correlação da Tomografia Helicoidal Computorizada (THC e dos aspectos encontrados por Broncofibroscopia Flexível (BFB, nas estenoses intrínsecas ou extrínsecas dos Brônquios Principais (BP e Brônquios Lobares (BL.A Tomografa Helicoidal Computorizada (THC pennite a localização espacial do tumor e visualizar as alterações estruturais circunvizinhas secundánas ao crescimento do tumor. A Tomografia Helicoidal Computorizada (THC pennitiu ainda a visualização da árvore brônquica para além da obstrução completa do lúmen brônquico, nos doentes em que não se conseguiu visualizar por broncofibroscopia.Nos tumores periféricos houve demonstração pela Tomografia Helicoidal Computorizada (THC de alterações estruturais da árvore brônquica que por Broncofibroscopia Flexível (BFB foram consideradas normais.Nesta série houve uma correlação directa entre a Tomografia Helicoidal Computorizada (THC e a Broncofibroscopia Flexível (BFB em quinze dos dezoito doentes estudados havendo uma sensibilidade de 83% no diagnóstico do tumor por broncofibroscopia. COMENTÁRIO: A Tomografia Helicoidal Computorizada (THC permite faze r o diagnóstico do cancro do pulmão em três dimensões visualizando as alterações estruturais circunvizinhas.As alterações endoscópicas visualizadas por Broncofibroscopia Flexível (BFB continuam a ser importantes, pela análise macroscópica das lesões e

  1. Presentation of test cases TC-2A, TC-2B, TC-2C, TC-2D - Twodimensional, incompressible, wall flows with separation

    DEFF Research Database (Denmark)

    Scheel Larsen, Poul

    1988-01-01

    The four test cases comprise the backfacing step at high Re-number (TC-2A) and low Re-number (TC-2B), a low Re-number boundary layer flow past a thin obstacle, fence-on-wall (TC-2C), and a high Re-number developed channel flow past a squareobstacle (TC-2D). Geometry, test conditions and available...

  2. Tc: chemistry and radiopharmaceuticals: a prospectus

    International Nuclear Information System (INIS)

    Tulip, T.H.

    1987-01-01

    The recent explosion in technetium chemistry evident in this symposium promises to continue unabated. As in the past, radiopharmaceutical applications will lead to new Tc chemistry. In this lecture the author will discuss those areas which appear most fertile based on chemical and radiopharmaceutical criteria. Among these will be new organometallic Tc chemistry (e.g., Tc(CNR) 6 cations), Tc complexes as metabolic tracers (e.g., Tc-analogs to FDG), and peptide-based Tc chelators (e.g., Tc-metallothionein)

  3. Prognosis of the computerized tomography in the severe head injury. Valor pronostico de la tomografia axial computada (TC) en los traumatismos craneoencefalicos severos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Nieto, J.J.; Lorenzo Dominguez, M.T.; Martin Sanchez, M.J.; Sanchez Gonzalez, E.

    1991-01-01

    A prospective study is made with sixty five people affected of severe head injury, that is to say, with eight or less points in the Glasgow Coma Scale (GCS), when they get to the hospital. They are studied by computerized tomography at admission, and three and seven days after arrival. In this way, we appraise the type of the lesion, its intensity and the possible prognosis, considering in the last case three features: a) ventricular collapse; b) the mean line structure s shift; and c) effects on perimesencephalic cistern. The findings were parametized and we were able to introduce into the computer program relationships between these findings and the end results. These last ones were appraised through the Glasgow Outcome Scale (GOS). We could show that certain findings in computerized tomography scans have an unavoidable prognosis while as others have a more favorable prognosis. (Author)

  4. Stratus optical coherence tomography findings in patients with retinopathy of prematurity Tomografia de coerência óptica em pacientes com retinopatia da prematuridade

    Directory of Open Access Journals (Sweden)

    Aline do Lago

    2007-02-01

    Full Text Available PURPOSE: To describe morphological features of the macula in patients with retinopathy of prematurity. METHODS: Twelve premature babies with retinopathy of prematurity grades I, II and III underwent dilated fundus examination and optical coherence tomography evaluation. RESULTS: In all thirteen eyes of the twelve premature patients optical coherence tomography revealed a condensed retinal pigmented epithelial layer in the macular-foveal area shown by increased reflectivity. In these eyes the retinal layers were not well differentiated. Foveal depression was clearly evident in 23%. CONCLUSIONS: In premature patients with retinopathy of prematurity, optical coherence tomography revealed poorly differentiated layers in the macular region with increased reflectivity in retinal pigmented epithelial-choriocapillaris zone.OBJETIVO: Descrever os aspectos morfológicos da mácula em pacientes com retinopatia da prematuridade (ROP. MÉTODOS: Doze pacientes com retinopatia da prematuridade graus I, II and III foram submetidos a mapeamento de retina e avaliação por tomografia de coerência óptica. RESULTADOS: Em todos os treze olhos de 12 pacientes a tomografia de coerência óptica mostrou a camada do epitélio pigmentar hiperrefletiva, sendo a área macular com maior intensidade. Nesses olhos as camadas da retina não estavam totalmente diferenciadas. A depressão foveal ficou claramente evidente pela tomografia de coerência óptica em 23%. CONCLUSÃO: Nos pacientes prematuros com retinopatia da prematuridade, a tomografia de coerência óptica mostrou as camadas da retina pouco diferenciadas com aumento da refletividade na área macular do complexo epitélio retiniano pigmentar-coriocapilar.

  5. A tomografia de córnea e segmento anterior na propedêutica do exame complementar na avaliação de ectasia

    Directory of Open Access Journals (Sweden)

    Bruno de Freitas Valbon

    2013-02-01

    Full Text Available Descrevemos a importância da tomografia de córnea e segmento anterior na propedêutica do exame complementar na avaliação de ectasia. Esta descrição da interpretação clínica dos índices da tomografia de córnea e segmento anterior (Pentacam - Oculus, Wetzlar, Germany neste relato de caso, demonstra a relevância de uma nova tecnologia na avaliação da córnea e segmento anterior na suspeita de ceratocone. O diagnóstico de ceratocone foi excluído pela análise dos índices tomográficos de ectasia. Detectou-se assimetria entre os lados nasal e temporal por meio da avaliação do mapa de profundidade de câmara anterior. No exame biomicroscópico sob midríase foi constatado subluxação do cristalino, sendo assim devemos estar atentos não somente aos índices tomográficos corneanos na avaliação do exame complementar e sim analisarmos outros dados importantes oferecidos pela tomografia de córnea e segmento anterior.

  6. Enhanced 99 Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals

    Energy Technology Data Exchange (ETDEWEB)

    Um, Wooyong; Luksic, Steven A.; Wang, Guohui; Saslow, Sarah; Kim, Dong-Sang; Schweiger, Michael J.; Soderquist, Chuck Z.; Bowden, Mark E.; Lukens, Wayne W.; Kruger, Albert A.

    2017-11-01

    Technetium (99Tc) immobilization by doping into iron oxide mineral phases may alleviate the problems with Tc volatility during vitrification of nuclear waste. Reduced Tc, Tc(IV), substitutes for Fe(III) in the crystal structure by a process of Tc reduction from Tc(VII) to Tc(IV) followed by co-precipitation of Fe oxide minerals. Two Tc-incorporated Fe minerals (Tc-goethite and Tc-magnetite/maghemite) were prepared and tested for Tc retention in glass melt samples at temperatures between 600 – 1,000 oC. After being cooled, the solid glass specimens prepared at different temperatures were analyzed for Tc oxidation state using Tc K-edge XANES. In most samples, Tc was partially oxidized from Tc(IV) to Tc(VII) as the melt temperature increased. However, Tc retention in glass melt samples prepared using Tc-incorporated Fe minerals were moderately higher than in glass prepared using KTcO4 because of limited and delayed Tc volatilization.

  7. High-Tc superconductor applications

    International Nuclear Information System (INIS)

    Anon.

    1988-01-01

    There has been much speculation about new products and business opportunities which high-Tc superconductors might make possible. However, with the exception of one Japanese survey, there have not been any recognized forecasts suggesting a timeframe and relative economic impact for proposed high-Tc products. The purpose of this survey is to provide definitive projections of the timetable for high-Tc product development, based on the combined forecasts of the leading U.S. superconductivity experts. The FTS panel of experts on high-Tc superconductor applications, representing both business and research, forecast the commercialization and economic impact for 28 classes of electronic, magnetic, communications, instrumentation, transportation, industrial, and power generation products. In most cases, forecasts predict the occurrence of developments within a 90% statistical confidence limit of 2-to-3 years. The report provides background information on the 28 application areas, as well as other information useful for strategic planners. The panel also forecast high-Tc research spending, markets, and international competitiveness, and provide insight into how the industry will evolve

  8. GASIFICATION TEST RUN TC06

    Energy Technology Data Exchange (ETDEWEB)

    Southern Company Services, Inc.

    2003-08-01

    This report discusses test campaign TC06 of the Kellogg Brown & Root, Inc. (KBR) Transport Reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). The Transport Reactor was operated as a pressurized gasifier during TC06. Test run TC06 was started on July 4, 2001, and completed on September 24, 2001, with an interruption in service between July 25, 2001, and August 19, 2001, due to a filter element failure in the PCD caused by abnormal operating conditions while tuning the main air compressor. The reactor temperature was varied between 1,725 and 1,825 F at pressures from 190 to 230 psig. In TC06, 1,214 hours of solid circulation and 1,025 hours of coal feed were attained with 797 hours of coal feed after the filter element failure. Both reactor and PCD operations were stable during the test run with a stable baseline pressure drop. Due to its length and stability, the TC06 test run provided valuable data necessary to analyze long-term reactor operations and to identify necessary modifications to improve equipment and process performance as well as progressing the goal of many thousands of hours of filter element exposure.

  9. Tomografia de coerência óptica na commotio retinae: relato de caso Optical coherence tomography imaging in commotio retinae: case report

    Directory of Open Access Journals (Sweden)

    Celso Morita

    2009-08-01

    Full Text Available O objetivo deste relato é correlacionar achados à tomografia de coerência óptica e prognóstico visual de pacientes com commotio retina e de gravidades diferentes. Dois pacientes do sexo masculino, de 20 e 23 anos com baixa visual unilateral após trauma ocular contuso atribuível a edema de Berlin foram avaliados pela retinografia e tomografia de coerência óptica. A acuidade visual no olho afetado era de 20/25 no primeiro paciente e conta dedos a 2 metros no segundo. O exame oftalmológico revelou uveíte traumática e, na fundoscopia, evidenciaram-se opacificação retiniana moderada no primeiro caso e grave no segundo. A tomografia de coerência óptica confirmou discreta diminuição da depressão foveal no primeiro caso e desorganização das camadas retinianas no segundo. Houve resolução anatômica e funcional completa a tomografia de coerência óptica no primeiro paciente, enquanto o segundo evoluiu com baixa visual permanente e desorganização da arquitetura retiniana. A tomografia de coerência óptica é um exame complementar útil na avaliação do trauma retiniano, ajudando a entender sua fisiopatologia e predizer prognóstico a partir da análise anatômica da região acometida.The purpose of this case report was to correlate optical coherence tomography findings and visual outcomes of patients with different degrees of commotio retinae. A 20-year-old male and a 23-year-old male that presented with decreased vision due to Berlin's edema after blunt ocular trauma were evaluated by optical coherence tomography and retinography. The visual acuity in the affected eye was 20/25 in the first patient and counting fingers in the second one. The ophthalmic examination showed traumatic uveitis and fundoscopy revealed mild retinal opacification in the first case and severe opacification in the latter. The optical coherence tomography confirmed the reduction of foveal depression on the first case and the disarrangement of all retinal

  10. Avaliação, por meio de microtomografia computadorizada, da anatomia interna e externa de primeiros pré-molares superiores

    OpenAIRE

    Amanda Buosi de Biagi

    2014-01-01

    O objetivo do presente estudo foi avaliar a anatomia do sistema de canais radiculares (SCR) de 72 primeiros pré-molares superiores (32 unirradiculares, 30 birradiculares com sulcos e 10 trirradiculares), por meio de microtomografia computadorizada (μCT). As amostras foram escaneadas no microtomógrafo SkyScan 1174 v2, e as imagens geradas foram reconstruídas para análise dos parâmetros bidimensionais (número, área, circularidade , diâmetro maior e menor, fator de forma) a 1, 2, 3 mm d...

  11. Tc-99m imaging agents

    International Nuclear Information System (INIS)

    Weininger, J.; Trumper, J.

    1984-01-01

    A wide range of pharmaceuticals for labeling with Tc-99m, developed by the Soreq Radiopharmaceuticals Department, is described. Details of the production and quality control of 13 kits are given, as well as the range of results required for consistently high quality imaging agents

  12. Tc7, a Tc1-hitch hiking transposon in Caenorhabditis elegans.

    OpenAIRE

    Rezsohazy, R; van Luenen, H G; Durbin, R M; Plasterk, R H

    1997-01-01

    We have found a novel transposon in the genome of Caenorhabditis elegans. Tc7 is a 921 bp element, made up of two 345 bp inverted repeats separated by a unique, internal sequence. Tc7 does not contain an open reading frame. The outer 38 bp of the inverted repeat show 36 matches with the outer 38 bp of Tc1. This region of Tc1 contains the Tc1-transposase binding site. Furthermore, Tc7 is flanked by TA dinucleotides, just like Tc1, which presumably correspond to the target duplication generated...

  13. Enhanced99Tc retention in glass waste form using Tc(IV)-incorporated Fe minerals

    OpenAIRE

    Um, W; Luksic, SA; Wang, G; Saslow, S; Kim, DS; Schweiger, MJ; Soderquist, CZ; Bowden, ME; Lukens, WW; Kruger, AA

    2017-01-01

    © 2017 Elsevier B.V. Technetium ( 99 Tc) immobilization by doping into iron oxide mineral phases may alleviate the problems with Tc volatility during vitrification of nuclear waste. Because reduced Tc, Tc(IV), substitutes for Fe(III) in the crystal structure by a process of Tc reduction from Tc(VII) to Tc(IV) followed by co-precipitation of Fe oxide minerals, two Tc-incorporated Fe minerals (Tc-goethite and Tc-magnetite/maghemite) were prepared and tested for Tc retention in glass melt sample...

  14. Altered [99mTc]Tc-MDP biodistribution from neutron activation sourced 99Mo.

    Science.gov (United States)

    Demeter, Sandor; Szweda, Roman; Patterson, Judy; Grigoryan, Marine

    2018-01-01

    Given potential worldwide shortages of fission sourced 99 Mo/ 99m Tc medical isotopes there is increasing interest in alternate production strategies. A neutron activated 99 Mo source was utilized in a single center phase III open label study comparing 99m Tc, as 99m Tc Methylene Diphosphonate ([ 99m Tc]Tc-MDP), obtained from solvent generator separation of neutron activation produced 99 Mo, versus nuclear reactor produced 99 Mo (e.g., fission sourced) in oncology patients for which an [ 99m Tc]Tc-MDP bone scan would normally have been indicated. Despite the investigational [ 99m Tc]Tc-MDP passing all standard, and above standard of care, quality assurance tests, which would normally be sufficient to allow human administration, there was altered biodistribution which could lead to erroneous clinical interpretation. The cause of the altered biodistribution remains unknown and requires further research.

  15. Computed Tomography of the diabetic kidney; La Tomografia Computerizzata nello studio del rene diabetico

    Energy Technology Data Exchange (ETDEWEB)

    Angelelli, G.; Stabile Ianora, A.A.; Scardapane, A.; Rotondo, A. [Bari Univ., Bari (Italy). Ist. di Radiologia

    2000-02-01

    The purpose of this work is to investigate whether any morphometric or densitometric are detectable in the kidneys of type 2 diabetic patients. 40 diabetic patients were examined and of 20 non-diabetics (the control group) were submitted to triphasic helical CT for different abdominal conditions. The type 2 diabetic patients were 23 men and 17 women, mean age 62 years, while the nondiabetic controls were 12 men and 8 women, mean age 58 years. All the CT images were analyzed using the Multiplanar Reconstruction (MPR) software. It was evaluated morphometric features, such as the presence of parenchymal or vascular calcifications, axial and coronal renal diameters, coronal renal area, and cortico medullary ratio, and densitometric and functional features, such as unenhanced renal density, cortical and medullary density in the arterial phase, parenchymal density in the nephrographic phase, and contrast elimination. It was also compared the results in the subgroups of patients with those in the controls. Both renal diameters on axial sections and cortical density in the arterial phase were significantly lower in the nephropathic group (p<0.05) than in non-nephropathic patients and control. The patients with shorter duration of their diabetes had significantly greater axial diameters (p<0.05); a longer-standing disease correlated significantly (p<0.05) with smaller axial diameters of kidneys and lower cortical density in the arterial phase. Renal diameters on axial and coronal sections and cortical density in the arterial phase can be useful indices of early nephropathy in diabetic patients. Further studies are warranted to make these findings suitable for use in clinical practice. [Italian] In questo articolo sono presentate le eventuali alterazioni tomodensitometriche a livello renale di pazienti affetti da diabete mellito di tipo 2. Si sono valutate retrospettivamente le immagini TC di 40 soggetti affetti da diabete di tipo 2 (23 maschi, 17 femmine, eta' media 62

  16. Diagnostic value of positron emission tomography/computed tomography with fluorine-18 fluorodeoxyglucose in patients with differentiated thyroid gland carcinoma, high thyroglobulin serum levels and negative iodine whole body scan; Valor diagnostico da tomografia por emissao de positrons/tomografia computadorizada (PET-CT) com fluor-18 fluordeoxiglicose (FDG-{sup 18}F) em pacientes com carcinoma diferenciado da tireoide, niveis sericos de tireoglobulina elevados e pesquisa de corpo inteiro com iodo negativa

    Energy Technology Data Exchange (ETDEWEB)

    Yamaga, Lilian Yuri Itaya; Cunha, Marcelo Livorsi da; Wagner, Jairo; Thom, Annelise Fischer; Daniel, Mauro Miguel; Funari, Marcelo B. de Gusmao [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil). Dept. de Imagem]. E-mail: itaya@einstein.br

    2007-06-15

    Purpose: To evaluate the role of PET-CT with FDG-{sup 18}F in the detection of recurrence and/or metastasis of differentiated thyroid carcinoma (DTC) in patients with elevated levels of thyroglobulin (TG) and negative whole body scan (WBS). Patients and method: PET-CT findings of 25 patients were compared to histopathology evaluation and conventional imaging (CI). Results: PET-CT scan was positive in 16 patients finding 14 true-positive and 2 false-positive cases (positive predictive value 87.5%). Nine patients had negative PET-CT; two had decrease of TG to undetectable levels. One patient had residual disease detected by post-therapeutic WBS. Six patients had no evidence of tumor during follow-up (mean time 16 months). PET-CT was concordant with CI in 52%, partially concordant in 12% and discordant in 36% (6 false-negatives and 3 false-positive of CI). We observed a tendency of increasing proportion of positive PET-CT with increasing TG. Conclusion: PET-CT scan with FDG-{sup 18}F is useful in the detection of recurrence and/or metastases of DTC with high TG levels but negative WBS. It presents elevated positive predictive value and is superior to CI being more effective as higher the serum TG levels. (author)

  17. Hydrogen-induced room-temperature plasticity in TC4 and TC21 alloys

    DEFF Research Database (Denmark)

    Yuan, Baoguo; Jin, Yongyue; Hong, Chuanshi

    2017-01-01

    In order to reveal the effect of hydrogen on the room-temperature plasticity of the titanium alloys TC4 and TC21, compression tests have been carried out at room temperature. Results show that an appropriate amount of hydrogen can improve the room-temperature plasticity of both the TC4 and TC21...... alloys. The ultimate compression strain of the TC4 alloy containing a hydrogen concentration of 0.5 wt.% increases by 39% compared to the untreated material. For the TC21 alloy the ultimate compression strain is increased by 33% at a hydrogen concentration of 0.6 wt.%. The main reason for the improvement...... of hydrogen-induced room-temperature plasticity of the TC4 and TC21 alloys is discussed....

  18. Microbial reduction of 99Tc (as TcO4-) in anaerobic alkaline conditions

    International Nuclear Information System (INIS)

    Khizhnyak, T.; Simonoff, M.; Sergeant, C.; Simonoff, G.; Medvedeva-Lyalikova, N.N.

    2003-01-01

    The ability of bacteria to reduce pertechnetate in alkaline conditions was investigated using halophilic bacteria isolated from soda-lakes environments. Anaerobic halophilic bacteria were able to reduce as much as 0.25 mM pertechnetate, whereas no reduction took place without bacteria or in the presence of heat-killed bacteria. The results obtained showed reduction of Tc(VII)O 4 - to the Tc(V) and Tc(IV) at pH 10 in the carbonate-bicarbonate medium. About 57% of the total technetium was determined to be Tc(IV), 1-3% as a Tc(V) and 17-20% as a Tc(VII) after 1-3 days of incubation with bacteria. The microbial reduction of Tc(VII) in alkaline conditions has been suggested as a potential mechanism for the removal of Tc from contaminated environments or waste streams. (author)

  19. Tc(V)-DMS tumour imaging agent

    International Nuclear Information System (INIS)

    Horiuchi, K.; Yomoda, I.; Yokoyama, A.; Endo, K.; Torizuka, K.

    1986-01-01

    The data obtained by the authors provide good evidence of Tc(V)-DMS as a stable, large-molecular-size Tc-complex or polynuclear Tc-complex, comparable to Tc-cit and Ga-cit. A role for this polynuclear configuration in the generation of Tc-species with affinity for neoplastic cells was demonstrated using the dilution method as a promoter of Tc(V)-DMS dissociation. The concurrent Ehrlich ascites tumour cell uptake studies with TLC analysis revealed the chromatographically detected changes well traced by the biological cell utilization. The biological implications of dilution as one of the factors regulating radiopharmaceutical delivery to the tumour cell tissue were better demonstrated in the biodistribution studies carried out with Erhlich ascites-bearing mice. If, on the basis of the present data, the authors may take their postulate one step further, a more dissociated Tc-species, defined speculatively as TcO/sub 4//sup 3-/, might constitute an active Tc- species within the cell interacting with some tumour-specific substance or site. Research to find evidence of its presence is currently in progress

  20. Using Tc-Re chemical analogy to synthesize and identify new 99mTc complexes

    International Nuclear Information System (INIS)

    Gambino, D.; Kremer, C.; Cartesio, S.; Leon, A.; Kremer, E.

    1989-01-01

    The strong chemical resemblance between Tc and Re is applied to design and evaluate experiments with 99m Tc complexes. A combination of spectrophotometric and electrophoretic techniques allows to propose the formula [TcO 2 (amine) 2 ] + for compounds prepared by reduction of 99m TcO 4 - with Zn (solid phase) in presence of several (bidentate) amines. (author) 10 refs.; 2 figs.; 4 tabs

  1. Superconductivity in the W-Tc and W2C-Tc systems

    International Nuclear Information System (INIS)

    Giorgi, A.L.

    1985-01-01

    A series of compositions in the W-Tc, W 2 C-Re and W 2 C-Tc systems were prepared and examined for superconductivity. The crystal structure, lattice parameters and superconducting transition temperatures of the W 2 C-Tc are reported for the first time. Similar measurements were made on the W-Tc and W 2 C-Re systems and the results compared with previous published results for these systems. 7 refs., 2 figs., 2 tabs

  2. Scavenging of Tc(V) formed by I.T. in 95mTcO4- solutions

    International Nuclear Information System (INIS)

    Ianoz, E.; Colin, M.; Kosinski, M.

    1988-01-01

    The chemical effects of the I.T. of 95m Tc in 95m TcO 4 - have been studied in chelating ligand solutions. At high pH and at high concentration of 1,4,8,11-tetraazacyclotetradecane and 1,4-dithia-8, 11-diazacyclotetradecane, the retention of 95g Tc is about 20% and the unretained 95g Tc appears preponderantly (ca. 73%) as [TcO 2 L] + complexes. In glucoheptonate solution, the 95g Tc retention remains practically the same (22%) but the unretained 95g Tc is found in high proportion (73%) as [TcObis(glucoheptonate)] - . The added ligands are very good scavengers for 95g Tc(V). A comparison is made between 95g Tc species formed by the I.T. in 95m TcO 4 - and 99m Tc species resulting from the chemical reduction of 99m TcO 4 - . (orig.)

  3. Solubility study of Tc(IV) oxides

    International Nuclear Information System (INIS)

    Liu, D.J.; Fan, X.H.

    2005-01-01

    The deep geological disposal of the high level radioactive wastes is expected to be a safer disposal method in most countries. The long-lived fission product 99 Tc is present in large quantities in nuclear wastes and its chemical behavior in aqueous solution is of considerable interest. Under oxidizing conditions technetium exists as the anionic species TcO 4 - whereas under the reducing conditions, expected to exist in a deep geological repository, it is generally predicted that technetium will be present as TcO 2 ·nH 2 O. Hence, the mobility of Tc(IV) in reducing groundwater may be limited by the solubility of TcO 2 ·nH 2 O under these conditions. Due to this fact it is important to investigate the solubility of TcO 2 ·nH 2 O. The solubility determines the release of radionuclides from waste form and is used as a source term in radionuclide migration analysis in performance assessment of radioactive waste repository. Technetium oxide was prepared by reduction of a technetate solution with Sn 2 + . The solubility of Tc(IV) oxide has been determined in simulated groundwater and redistilled water under aerobic and anaerobic conditions. The effects of pH and CO 3 2- concentration of solution on solubility of Tc(IV) oxide were studied. The concentration of total technetium and Tc(IV) species in the solutions were periodically determined by separating the oxidized and reduced technetium species using a solvent extraction procedure and counting the beta activity of the 99 Tc with a liquid scintillation counter. The experimental results show that the rate of oxidation of Tc(IV) in simulated groundwater and redistilled water is about (1.49-1.86) x 10 -9 mol/(L·d) under aerobic conditions, but Tc(IV) in simulated groundwater and redistilled water is not oxidized under anaerobic conditions. Under aerobic or anaerobic conditions the solubility of Tc(IV) oxide in simulated groundwater and redistilled water is equal on the whole after centrifugation or ultrafiltration. The

  4. Determination of Tc-99 in radioactive wastes

    International Nuclear Information System (INIS)

    Rivera S, A. A.

    2015-01-01

    Tc-99 is a fission product and one of the most important radionuclides from the view point of safety assessment for the disposal of radioactive waste because of its long half-life (2.1 x 10 5 years) and high mobility in soil-water systems, if this is released into the environment in significant quantities can concentrate on plants and animals. Tc-99 is a pure beta emitter with a maximum energy of 292 KeV, so their quantification imposes destructive methods to be analyzed by liquid scintillation. Therefore the quantification of Tc-99 in ion exchange resins requires of the mineralization of these and separation of Tc-99 of other radioisotopes present in the resin. Therefore the object of this thesis is to develop a quantification method of Tc-99 content in spent exchange resins. So in order to track the behavior of technetium during digestion exchange resins and radiochemical separation, given its high volatility, in this work the 99m Tc is used. To determine the degree of mineralization of the resins, an analysis was performed by chromatography. Subsequently the method used to determine the percentage of 99m Tc aerosolized during mineralization of resin is described. After the method for the radiochemical separation of 99m Tc is presented by liquid-liquid extraction using crown ether as extractant; for this testing was performed by varying the molarity of the extractant, the ratio of solvent extractant, type of digestion of the resin and the presence of Sr-85, in order to study the behavior of 99m Tc in the presence of this radioisotope. Finally, a track beta spectra of a sample of 99m Tc eluted from a generator 99 Mo/ 99m Tc function of time was performed. (Author)

  5. Osteoporosis and prevention. Assessment of mineral density, geometry and biomechanics of bone by means of peripheral quantitative Computed Tomography (pQCT) in premenopausal women assuming phytoestrogens; Osteoporosi e fitoestrogeni: valutazione della densita' minerale ossea mediante tomografia computerizzata quantitativa periferica nelle donne lattoovovegetariane nella premenopausa

    Energy Technology Data Exchange (ETDEWEB)

    Di Leo, C; Tarolo, G L; Bestetti, A; Tagliabue, L; Del Sole, A; Alberti, G [Ospedale San Paolo, Milan (Italy). Servizio di Medicina Nucleare; Cestaro, B [Milan Univ., Milan (Italy). Cattedra e Scuola di Specializzazione in Medicina Nucleare; Pepe, L [ACN-L' Accessorio Nucleare, Cerro Maggiore, MI (Italy). Lab. Nucleari

    2000-04-01

    Aim of the work was to describe the noninvasive assessment of bone mineral density, geometrical and biochemical properties in premenopausal women with dietary intake of phytoestrogens and comparison of these parameters with those of age-matched female subjects with Mediterranean dietary intake lacking in these substances. Volumetric cortical, trabecular and total mineral density and bone geometrical properties were evaluated with peripheral quantitative computed tomography (pQCT) at the distal radius of the non dominant forearm. pQCT showed higher bone mineral density (total and trabecular) and SSI values in premenopausal with dietary intake of phytoestrogens. Despite the lack of statistical significance, these preliminary results, should further support the few literature findings about the potential role of phytoestrogens consumption in preventing trabecular bone loss. However, further studies are warranted to evaluate definitively postmenopausal osteoporosis. [Italian] Scopo del lavoro e' quello di studiare in modo non-invasivo la densita' minerale, le caratteristiche geometriche e biomeccaniche dell'osso in donne lattoovovegetariane nella premenopausa che assumevano con la dieta fitoestrogeni e confrontare questi dati con quelli di donne anch'esse in premenopausa, con dieta di tipo mediterraneo assolutamente priva di questi elementi con azione simil-ormonale. La densita' minerale, le proprieta' geometriche meccaniche dell'osso sono state valutate a livello del radio ultradistale non dominante mediante tomografia computerizzata (TC) quantitativa periferica, che nelle donne in premenopausa con dieta ricca di fitoestrogeni ha evidenziato valori della densita' minerale ossea totale, trabecolare e di resistenza ossea piu' elevati, anche se in modo non significativo, rispetto a quelli dei controlli con dieta mediterranea. Questi risultati preliminari suggerirebbero come l'assunzione quotidiana di fitoestrogeni attraverso la soia potrebbe accompagnarsi a un maggiore

  6. Osteoporosis and prevention. Assessment of mineral density, geometry and biomechanics of bone by means of peripheral quantitative Computed Tomography (pQCT) in premenopausal women assuming phytoestrogens; Osteoporosi e fitoestrogeni: valutazione della densita' minerale ossea mediante tomografia computerizzata quantitativa periferica nelle donne lattoovovegetariane nella premenopausa

    Energy Technology Data Exchange (ETDEWEB)

    Di Leo, C.; Tarolo, G.L.; Bestetti, A.; Tagliabue, L.; Del Sole, A.; Alberti, G. [Ospedale San Paolo, Milan (Italy). Servizio di Medicina Nucleare; Cestaro, B. [Milan Univ., Milan (Italy). Cattedra e Scuola di Specializzazione in Medicina Nucleare; Pepe, L. [ACN-L' Accessorio Nucleare, Cerro Maggiore, MI (Italy). Lab. Nucleari

    2000-04-01

    Aim of the work was to describe the noninvasive assessment of bone mineral density, geometrical and biochemical properties in premenopausal women with dietary intake of phytoestrogens and comparison of these parameters with those of age-matched female subjects with Mediterranean dietary intake lacking in these substances. Volumetric cortical, trabecular and total mineral density and bone geometrical properties were evaluated with peripheral quantitative computed tomography (pQCT) at the distal radius of the non dominant forearm. pQCT showed higher bone mineral density (total and trabecular) and SSI values in premenopausal with dietary intake of phytoestrogens. Despite the lack of statistical significance, these preliminary results, should further support the few literature findings about the potential role of phytoestrogens consumption in preventing trabecular bone loss. However, further studies are warranted to evaluate definitively postmenopausal osteoporosis. [Italian] Scopo del lavoro e' quello di studiare in modo non-invasivo la densita' minerale, le caratteristiche geometriche e biomeccaniche dell'osso in donne lattoovovegetariane nella premenopausa che assumevano con la dieta fitoestrogeni e confrontare questi dati con quelli di donne anch'esse in premenopausa, con dieta di tipo mediterraneo assolutamente priva di questi elementi con azione simil-ormonale. La densita' minerale, le proprieta' geometriche meccaniche dell'osso sono state valutate a livello del radio ultradistale non dominante mediante tomografia computerizzata (TC) quantitativa periferica, che nelle donne in premenopausa con dieta ricca di fitoestrogeni ha evidenziato valori della densita' minerale ossea totale, trabecolare e di resistenza ossea piu' elevati, anche se in modo non significativo, rispetto a quelli dei controlli con dieta mediterranea. Questi risultati preliminari suggerirebbero come l'assunzione quotidiana di fitoestrogeni

  7. Accumulation, elimination and retention of 99Tc by duckweed

    International Nuclear Information System (INIS)

    Hattink, J.; Weltje, L.; Wolterbeek, H.Th.; Goeij, J.J.M. de

    2004-01-01

    Accumulation dynamics of the long-lived fission product technetium ( 99 Tc) in duckweed is studied. Duckweed serves as model for aquatic plants, because of its representative foliar uptake for 99 Tc. 99 Tc is irreversibly accumulated and distributed over cytoplasm, chloroplasts and mitochondria. Autoradiography showed that 99 Tc was not transported to new biomass. Irreversible storage of 99 Tc in plant biomass means that steady-state situations cannot be interpreted as a balance between uptake and elimination of 99 Tc, but that 99 Tc continuously builds up in each single duckweed plant and overall Tc concentrations are averaged over new biomass. (author)

  8. On the interaction of granite with Tc(IV) and Tc(VII) in aqueous solution

    International Nuclear Information System (INIS)

    Eriksen, T.E.; Cui, Daquing

    1991-10-01

    The behaviour of technetium in granite-groundwater systems under reducing conditions was investigated. The anion TcO 4 - was reduced to Tc(IV) and simultaneously precipitated as TcO 2 xnH 2 O on the granite surfaces. The electron sources are assumed to be iron oxides and/or iron containing minerals in the granite. The technetium concentration in ground water under repository conditions may be predicted assuming TcO 2 xnH 2 O as the solid phase and TcO(OH) 2 0 and TcO 4 - as the predominant aqueous complexes using a formation constant for TcO(OH) 2 0 of log K = -8.16 and a standard reduction potential E 0 for the reaction TcO 4 - + 3e - + 4H + = TcO 2 xnH 2 O of 0.738 V. The surface related distribution ratio K a for TcO(OH) 2 0 between Stripa granite and ground water is approximately 1 cm based on geometrical surface area. (au)

  9. Olanzapine induced Q-Tc shortening.

    Science.gov (United States)

    Shoja Shafti, Saeed; Fallah Jahromi, Parisa

    2014-12-01

    Prolongation of Q-Tc interval is commonly accepted as a surrogate marker for the ability of a drug to cause torsade de pointes. In the present study, safety of olanzapine versus risperidone was compared among a group of patients with schizophrenia to see the frequency of the electrocardiographic alterations induced by those atypical antipsychotics. Two hundred and sixty-eight female inpatients with schizophrenia entered in one of the two parallel groups to participate in an open study for random assignment to olanzapine (n = 148) or risperidone (n = 120). Standard 12-lead surface electrocardiogram (ECG) was taken from each patient at baseline, before initiation of treatment, and then at the end of management, just before discharge. The parameters that were assessed included heart rate (HR), P-R interval, QRS interval, Q-T interval (corrected = Q-Tc), ventricular activation time (VAT), ST segment, T wave, axis of QRS, and finally, interventricular conduction process. A total of 37.83% of cases in the olanzapine group and 30% in the risperidone group showed some Q-Tc changes; 13.51% and 24.32% of the patients in the olanzapine group showed prolongation and shortening of the Q-Tc, respectively, while changes in the risperidone group were restricted to only prolongation of Q-Tc. Comparison of means showed a significant increment in Q-Tc by risperidone (p = 0.02). Also, comparison of proportions in the olanzapine group showed significantly more cases with shortening of Q-Tc versus its prolongation (p = 0.01). No significant alterations with respect to other variables were evident. Olanzapine and risperidone had comparable potentiality for induction of Q-Tc changes, while production of further miscellaneous alterations in ECG was more observable in the olanzapine group compared with the risperidone group. Also shortening of Q-Tc was specific to olanzapine.

  10. sup(99m)Tc-2-mercaptopropionylglycine

    International Nuclear Information System (INIS)

    Saji, Hideo; Odori, Teruo; Morita, Rikushi; Yokoyama, Akira; Tanaka, Hisashi.

    1979-01-01

    Labeling of 2-mercaptopropionylglycine (2-MPG) with sup(99m)Tc, was studied and its chemical characteristics were examined. Further, biliary excretion behavior of this complex was comparatively estimated in mice, rats and rabbits. sup(99m)Tc-2-MPG was rapidly excreted in large quantities into the bile in mice and rats: within 1 hr after injection, 51% of the injected dose was recovered from the bile in rats. On the other hand, the ligand exchange reaction between this complex and penicillamine indicates that a low hydrolyzed sup(99m)Tc species is coordinated with 2-MPG. These results suggest that a low hydrolyzed sup(99m)Tc state is an effective feature in biliary excretion behavior of sup(99m)Tc compounds. Another interesting in vivo behavior of sup(99m)Tc-2-MPG is the difference observed in mice and rabbits: in mice, very high sup(99m)Tc activity is concentrated in the gallbladder and the clearance from tissues other than the gallbladder is rapid, whereas in rabbits, although a rapid and high excretion into the gallbladder is observed, a considerable high sup(99m)Tc activity is retained in the liver and the kidney. One reason for this different in vivo behavior is the low stability of this complex at high dilution: a big animal has the large dilution volume which lead to higher decomposition estimated by the higher liver and kidney retention or the lower bile excretion. In conclusion, studies carried on sup(99m)Tc-2-MPG showed a good biliary excretion behavior but an in vivo unstableness in big animals. (author)

  11. CT diagnosis of subphrenic abscess after splenectomy for trauma; Ruolo della tomografia computerizzata nella valutazione degli ascessi subfrenici dopo splenectomia post-traumatica

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A. [Ospedale Loreto-Mare, Neaples (IT). Serv. di Radiologia] [and others

    1999-09-01

    The paper studies subphrenic inflammatory abscesses and splenic fluid collections after splenectomy for trauma. These complications may appear early or late postoperatively; they are easily demonstrated with computerized tomography, which permits accurate spatial assessment of the lesions and appropriate treatment with percutaneous drainage. It has been also investigates the diagnostic accuracy of the CT in subphrenic inflammatory conditions after emergency splenectomy for traumatic spleen rupture and found that CT is a precious tool for rapid and easy diagnosis and follow-up of subphrenic abscesses treated with percutaneous drainage. [Italian] Scopo del lavoro e' di valutare il ruolo della tomografia computerizzata nelle flogrosi subfreniche secondarie a splenectomia d'urgenza per rottura traumatica della milza, documentando come tale metodica risulti accurata nel diagnosticare e monitorare in modo semplice e rapido l'evoluzione e il controllo degli ascessi subfrenici trattati con drenaggio percutaneo.

  12. CT findings after normal and unsuccessful functional endoscopic sinus surgery; Ruolod della tomografia computerizzata dopo chirurgia funzionale dei seni paranasali: rilievi normali e valutazioni degli insuccessi chirurgici

    Energy Technology Data Exchange (ETDEWEB)

    Scribano, E.; Ascenti, G.; Bellinvia, A.; Mazziotti, S.; Lamberto, S. [Messina Univ., Messina (Italy). Ist. di Scienze Radiologiche; Cascio, F. [Messina Univ., Messina (Italy). Ist. di Otorinolaringoiatria

    1999-09-01

    The paper investigates the functional endoscopic sinus surgery with the Messer-linger's technique which treats benign or inflammatory diseases of paranasal sinuses resistant to medical therapy. The goal of this type of surgery is to open the obstructed sinus ostia and restore normal aeration and mucociliary clearance. The computerized tomography permits an accurate assessment of extension and results of functional endoscopic sinus surgery. [Italian] L'articolo discute l'uso della tecnica di Messerklinger nella chirurgia funzionale endoscopica dei seni paranasali per il trattamento delle malattie benigne e delle infiammazioni croniche. Essa disostruisce gli osti sinusali ripristinando la normale areazione e la pulizia mucociliare. La tomografia computerizzata consente di valutare l'estensione e i risultati del trattamento chirurgico funzionale, soprattutto nel caso di insuccesso terapeutico, rilevando malattia nasosinusale ricorrente e-o recidiva.

  13. Solubility of Tc(IV) oxides

    International Nuclear Information System (INIS)

    Liu, D.J.; Fan, X.H.

    2005-01-01

    Full text of publication follows: The deep geological disposal of the high level radioactive wastes is expected to be a safer disposal method in most countries. The long-lived fission product 99 Tc is present in large quantities in nuclear wastes and its chemical behavior in aqueous solution is of considerable interest. Under the reducing conditions, expected to exist in a deep geological repository, it is generally predicted that technetium will be present as TcO 2 .nH 2 O. The solubility of Tc(IV) is used as a source term in performance assessment of radioactive waste repository. Technetium oxide was prepared by reduction of a technetate solution with Sn 2+ . The solubility of Tc(IV) oxide has been determined in simulated groundwater and re-distilled water under aerobic and anaerobic conditions. The effects of pH and CO 3 2- concentration of solution on solubility of Tc(IV) oxide were studied. The concentration of total technetium and Tc(IV) species in the solutions were periodically determined by separating the oxidized and reduced technetium species using a solvent extraction procedure and counting the beta activity of the 99 Tc with a liquid scintillation counter. The experimental results show that the rate of oxidation of Tc(IV) in simulated groundwater and re-distilled water is about (1.49∼1.86) x 10 -9 mol/(L.d) under aerobic conditions, but Tc(IV) in simulated groundwater and re-distilled water is not oxidized under anaerobic conditions. Under aerobic or anaerobic conditions the solubility of Tc(IV) oxide in simulated groundwater and re-distilled water is equal on the whole after centrifugation or ultrafiltration. The solubility of Tc(IV) oxide decreases with the increase of pH at pH 10 and is pH independent in the range 2 -8 to 10 -9 mol/L at 2 3 2- concentration. These data could be used to estimate the Tc(IV) solubility for cases where solubility limits transport of technetium in reducing environments of high-level waste repositories. (authors)

  14. Paracoccidioidomicose pulmonar: relato de caso clínico com aspetos em tomografia computorizada de alta resolução

    Directory of Open Access Journals (Sweden)

    M. Armas

    2012-07-01

    Full Text Available Resumo: A Paracoccidioidomicose é uma micose sistémica endémica nas áreas rurais da América Latina, uma fonte importante de imigrantes e destino de emigração e turismo europeu, a maioria dos casos ocorrendo no Brasil, Argentina, Venezuela e Colômbia. Os autores descrevem o caso clínico de um paciente com 43 anos, anteriormente emigrado na Venezuela e residente em Portugal há 8 anos, que se apresenta com lesão cutânea isolada. Embora sem queixas relevantes do foro respiratório, apresentava extensas lesões do parênquima pulmonar caracterizadas por tomografia computorizada de alta resolução (TCAR. Foi realizada biópsia da lesão cutânea e exame micológico da expetoração que revelaram infeção por Paracoccidioides brasiliensis (PB. Abstract: Paracoccidioidomycosis is a systemic mycosis which is endemic in rural areas of Latin America, an important European source of immigrants and a growing European touristic destination as well, with most cases occurring in Brazil, Argentina, Venezuela and Colombia. The authors report a case of a 43 year old man who previously worked in Venezuela and is living in Portugal for 8 years, presenting with a single cutaneous lesion. Despite the absence of valuable respiratory complaints, severe lung damage was found with high-resolution computed tomography (HRCT. Biopsy of the cutaneous lesion and mycologic sputum examination were performed revealing Paracoccidioides brasiliensis infection. Palavras-chave: Paracoccidioidomicose, Paracoccidioides brasiliensis, Fibrose pulmonar, Tomografia computorizada de alta resolução, Keywords: Paracoccidioidomycosis, Paracoccidioides brasiliensis, Pulmonary fibrosis, High-resolution computed tomography

  15. Analysis of the of bones through 3D computerized tomography; Analise de estrutura ossea atraves de microtomografia computadorizada 3D

    Energy Technology Data Exchange (ETDEWEB)

    Lima, I.; Lopes, R.T. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE), Rio de Janeiro, RJ (Brazil). Lab. de Instrumentacao Nuclear; Oliveira, L.F. [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Inst. de Fisica. Dept. de Fisica Aplicada e Termodinamica; Alves, J.M. [Universidade de Sao Paulo (USP), Sao Carlos, SP (Brazil). Escola de Engenharia

    2009-03-15

    This work shows the analysis of the internal structure of the bones samples through 3D micro tomography technique (3D-{mu}TC). The comprehension of the bone structure is particularly important when related to osteoporosis diagnosis because this implies in a deterioration of the trabecular bone architecture, which increases the fragility and the possibility to have bone fractures. Two bone samples (human calcaneous and Wistar rat femur) were used, and the method was a radiographic system in real time with an X Ray microfocus tube. The quantifications parameters are based on stereological principles and they are five: a bone volume fraction, trabecular number, the ratio between surface and bone volume, the trabecular thickness and the trabecular separation. The quantifications were done with a program developed especially for this purpose in Nuclear Instrumentation Laboratory - COPPE/UFRJ. This program uses as input the 3D reconstructions images and generates a table with the quantifications. The results of the human calcaneous quantifications are presented in tables 1 and 2, and the 3D reconstructions are illustrated in Figure 5. The Figure 6 illustrate the 2D reconstructed image and the Figure 7 the 3D visualization respectively of the Wistar femur sample. The obtained results show that the 3D-{mu}TC is a powerful technique that can be used to analyze bone microstructures. (author)

  16. 99mTc-EDTA and 99mTc-DTPA complexes as hydrological tracers

    International Nuclear Information System (INIS)

    Dominguez, J.; Borroto, J.; Nazco, J.; Perez, E.; Gamboa, R.; Cruz, J.

    2002-01-01

    The [ 99m Tc-DTPA] 2- and [ 99m Tc-EDTA] 1- were evaluated as radiotracers for short time hydrological studies. Their complex stability after labelling with 9.25 GBq of 99m Tc, the behaviour against pH variations, from 5 to 9, in simulated solutions and in natural river waters and the sorption of these compounds on the river sediments, were tested in laboratory experiments. Finally field double tracing experiments were carried out for each of labelling complexes and Rhodamine WT. From recovery calculations not losses of the 99m Tc activity were observed. The shape of the RTD curves of the [ 99m Tc-DTPA] 2- and [ 99m Tc-EDTA] 1 were quite similar to the Rhodamine Wt ones. May be concluded that both complexes behaved conservatively on the studied environmental conditions. (author)

  17. Comparative binding characteristics of Tc-CPI, Tc-TBI, and Tc-MIBI in cultured heart cells: Correlation with biochemical analysis and animal images

    International Nuclear Information System (INIS)

    Piwnica-Worms, D.; Kronauge, J.F.; Holman, B.L.; Davison, A.; Jones, A.G.

    1987-01-01

    Hexakis (isonitrile)technetium (I) complexes are a new class of cationic, lipophilic myocaridal perfusion imaging agents. To better understand their cellular mechanisms of uptake and washout, chick heart cells grown in culture were used as a model myocardial system. Tc-MIBI showed uptake to a plateau at a rate similar to Tc-CPI (t1/2 = 4.1 +- 0.7 minutes); however, the plateau was 63% greater. Tc-TBI uptake approached a plateau 900% greater than Tc-CPI binding. Heart cell studies showed washout of Tc-CPI>Tc-TBI>Tc-MIBI, which correlated with kinetic analysis of rabbit myocardial images. Biochemical in vitro analysis in human plasma demonstrated 75% enzymatic ester hydrolysis of Tc-CPI by 3 minutes, but no hydrolysis of Tc-TBI and Tc-MIBI. The results suggest that metabolism of the ester function of Tc-CPI following myocardial uptake may in part account for the more rapid cellular washout rates of Tc-CPI compared with Tc-TBI and Tc-MIBI

  18. 99mTc bone scanning agents preparation and chemical analysis of Tc(Sn)pyrophosphate, Tc(Sn)MDP and Tc(Sn)HMDP

    International Nuclear Information System (INIS)

    Kroesbergen, J.

    1986-01-01

    This thesis describes a comparison of the preparation, composition and properties of three bone scanning agents: 99m Tc(Sn)pyrophosphate, 99m Tc(Sn)MDP and 99m Tc(Sn)HMDP. This study has been performed for two reasons: First to investigate the preparation and composition of the radiopharmaceuticals as a function of experimental conditions. Together with previously reported results for 99m Tc(Sn)EHDP, obtained in a similar way, this enables to use well-defined preparations of the bone scanning agents. Secondly to gain an insight in the mechanism in which the agents behave 'in vivo'. Because the 'in vivo' process is too complicated to study directly, it seemed more appropriate to perform 'in vitro' investigations as simplifications of the 'in vivo' situation. 304 refs.; 26 figs.; 31 tabs

  19. Transmutation of Tc-99 in fission reactors

    International Nuclear Information System (INIS)

    Kloosterman, J.L.; Li, J.M.

    1994-12-01

    Transmutation of Tc-99 in three different types of fission reactors is considered: A heavy water reactor, a fast reactor and a light water reactor. For the first type a CANDU reactor was chosen, for the second one the Superphenix reactor, and for the third one a PWR. The three most promising Tc-99 transmuters are the fast reactor with a moderated subassembly in the inner core, a fast reactor with a non-moderated subassembly in the inner core, and a heavy water reactor with Tc-99 target pins in the moderator between the fuel bundles. Transmutation half lives of 15 to 25 years can be achieved, with yearly transmuted Tc-99 masses of about 100 kg at a thermal reactor power of about 3000 MW. (orig.)

  20. On the separation of 99mTcO4-, 99mTc-DTPA and 99mTc-citrate as marker species for the determination of Tc chemical forms in plant material using capillary zone electrophoresis

    NARCIS (Netherlands)

    Krijger, G.C.; Claessens, H.A.; Wolterbeek, H.Th.

    1996-01-01

    The present paper addresses the potential use of capillary zone electrophoresis (CZE) as an anal. tool in 99Tc speciation studies. To optimize sampling, storage and anal. procedures, the three marker compds. 99mTcO4-, 99mTc-DTPA and 99mTc-citrate were synthesized and used in test-measurements with

  1. Tc-99m-hexakis(t-butylisonitrile)-technetium(I) (Tc-99m-TBI)

    International Nuclear Information System (INIS)

    Angelberger, P.; Dudczak, R.; Jones, A.G.; Lister-James, J.; Wagner-Loffler, M.; Buchheit, O.; Fally, F.

    1986-01-01

    The potassium analog (Tl-201)/sup +/ is widely used in nuclear cardiology but has inferior scintigraphic (80 keV photons), dosimetric and economic properties as compared to Tc-99m. Therefore considerable efforts have been made to develop a Tc-compound that would accumulate in the myocardium in relation to regional blood flow. This study was aimed at optimizing the preparation of Tc-TBI with n.c.a. Tc-99m, analyze and purify the product with HPLC, verify biodistribution in mice and undertake a clinical evaluation

  2. Radiopharmaceuticals to 99mTc

    International Nuclear Information System (INIS)

    Leon Cabana, Alba

    1994-01-01

    Studies about 99m Tc had demonstrated that have favorable properties for support diagnostic proceedings in nuclear medicine. This physical and chemical properties used for obtain another radiopharmaceuticals have been employed through re actives kits labelled with Tc 99m . A brief description was given about 99m utilities in diagnostic techniques such as endothelium reticular system,renal and hepatic studies,bone scintillators,cardiac diagnostic and cerebral perfusion

  3. Electrolytic 99TcO4- reduction at inert electrodes

    International Nuclear Information System (INIS)

    Kremer, C.; Gambino, D.; Leon, A.; Kremer, E.

    1990-01-01

    Electrolytic pertechnetate reduction at inert electrodes was studied as an alternative procedure for synthesizing Tc complexes. Pertechnetate reduction was carried out in aqueous media using different aminated ligands (en, dien, trien and 1,3-dap) forming [TcO 2 (amine) 2 ] + type complexes. Simultaneously with synthesis of the desired Tc complex, TcO 2 was electrodeposited onto the cathode. Conversion of TcO 4 - to Tc complex and TcO 2 was studied as a function of several variables (kind and concentration of supporting electrolyte, ligand concentration, pH, current and electrolysis time). (author) 9 refs.; 6 figs.; 1 tab

  4. Computed tomography to evaluate the association of fragmented heterolog cortical bone and methylmethacrylate to repare segmental bone defect produced in tibia of rabbits; Tomografia computadorizada da matriz ossea mineralizada heterologa fragmentada e metilmetacrilato na reparacao de falhas osseas segmentares produzidas em tibia de coelhos

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, S.H. [Universidade Federal de Sao Paulo (USP), SP (Brazil); Doria, R.G.S. [Universidade Federal de Sao Paulo (USP), SP (Brazil). Faculdade de Zootecnia e Engenharia de Alimentos; Mendonca, F.S.; Santos, M.D.; Moreira, R. [Universidade de Cuiaba, MT (Brazil). Faculdade de Medicina Veterinaria; Simoes, R.S. [Universidade Federal de Sao Paulo (USP), SP (Brazil). Hospital Universitario; Camargo, L.M.; Simoes, M.J. [Universidade Federal de Sao Paulo (USP), SP (Brazil). Escola Paulista de Medicina; Marques, A.T.C. [Universidade de Cuiaba, MT (Brazil). Faculdade de Odontologia

    2012-11-15

    A 6mm segmental defect was performed on the metaphyseal region of the tibia of 12 rabbits and the autoclaved fragmented heterolog cortical bone conserved in glycerin (98%) and methylmethacrylate was used as a bone graft for the reconstruction. The graft was placed in the receptor bed and its integration was evaluated by computed tomography after 30, 60 and 90 days. There was gradual bone graft incorporation in the receptor bed during the time in 100% of the cases. Fragmented cortical bone heterograft and methylmethacrylate was biologically compatible and promotes bone defect reparation without signs of infection, migration and or rejection, featuring a new option of osseous substitute to fill in bone defects. (author)

  5. Contribution of computed tomography in patients with lung metastases of differentiated thyroid carcinoma not apparent on plain radiography who were treated with radioiodine; Contribuicao da tomografia computadorizada em pacientes com metastases pulmonares de carcinoma diferenciado de tireoide nao-aparentes na radiografia e tratados com radioiodo

    Energy Technology Data Exchange (ETDEWEB)

    Rosario, Pedro W.S.; Purisch, Saulo [Santa Casa Belo Horizonte, MG (Brazil). Dep. de Tireoide. Servico de Endocrinologia]. E-mail: pedrorosario@globo.com; Tavares, Wilson C. [Instituto Alpha de Gastroenterologia, Belo Horizonte, MG (Brazil); Barroso, Alvarao L.; Rezende, Leonardo L.; Padrao, Eduardo L. [Santa Casa Belo Horizonte, MG (Brazil). Servico de Medicina Nuclear

    2008-02-15

    Computed tomography (CT or CAT Scan) of the chest is more sensitive than radiography in the detection of lung metastases of differentiated thyroid cancer (DTC), but little information is available regarding the aggregated value of this method. The present study evaluated the response of patients with lung metastases of DTC not apparent on radiography to treatment with {sup 131}I and the value of CT in these cases. Twenty-five patients with lung metastases not apparent on radiography, who initially received 100-200 mCi I{sup 151}, were evaluated and those presenting pulmonary uptake on post-therapy WBS were submitted to a new treatment after 6 to 12 months, and so on. The chance of detection of pulmonary uptake on post-therapy WBS did not differ between patients with negative and positive CT (100% versus 91.5%). Mean serum Tg levels were higher in patients with positive CT (108 ng/ml versus 52 ng/ml). Negative post-therapy WBS was achieved in 82% of patients with positive CT and in 92.3% with negative CT and the cumulative I{sup 131} activity necessary to achieve this outcome did not differ between the two groups (mean = 300 mCi). Stimulated Tg was undetectable in 47% of patients with negative CT at the end of treatment, but in none of the patients whose CT continued to be positive. In patients with elevated Tg, the CT result apparently did not change the indication of therapy or the I{sup 131} activity to be administered. In cases with lung metastases, the persistence of micronodules on CT was associated with the persistence of detectable Tg in patients presenting negative post-therapy WBS. (author)

  6. Estudo comparativo do tono muscular na paralisia cerebral tetraparética em crianças com lesões predominantemente corticais ou subcorticais na tomografia computadorizada de crânio Comparative study of muscular tonus in spastic tetraparetic cerebral palsy in children with predominantly cortical and subcortical lesions in computerized tomography of the skull

    Directory of Open Access Journals (Sweden)

    Cristina Iwabe

    2003-09-01

    Full Text Available OBJETIVO: Comparar a distribuição e intensidade do tono muscular na paralisia cerebral tetraparética espástica (PC-T, correlacionando os dados clínicos com a localização da lesão no sistema nervoso central. MÉTODO: Foram incluídas 12 crianças de dois a quatro anos de idade com lesões predominantemente corticais (seis crianças e subcorticais (seis crianças. O tono foi analisado nos membros superiores (MMSS e inferiores (MMII baseado no protocolo de Durigon e Piemonte. RESULTADOS: Não houve diferença significante quanto à intensidade e distribuição de tono em MMSS e MMII nos dois grupos. Comparando os MMSS e MMII de sujeitos do mesmo grupo, os MMII apresentaram mais assimetrias e maior intensidade do tono do que os MMSS. CONCLUSÃO: Neste estudo, crianças com PC devido a lesões predominantemente corticais ou subcorticais apresentam déficit semelhante na modulação de tono, ocasionando distribuição simétrica e homogênea de hipertonia que predomina em MMII.OBJECTIVE: To compare distribution and intensity of muscular tonus in spastic tetraparetic cerebral palsy (CP, correlating the clinical data with lesion location in the central nervous system. METHOD: Twelve children aged two to four years old with predominantly cortical lesions (six children and subcortical lesions (six children were included. The tonus was analyzed in the upper (UULL and lower limbs (LLLL based on Durigon and Piemonte protocol. RESULT: There was no significant difference regarding tonus intensity and distribution in the UULL and LLLL in both groups. Comparing the upper and lower limbs of subjects in the same group, the LLLL presented more asymmetry and higher tonus intensity than the UULL. CONCLUSION: In this study children with CP as a result of predominantly cortical or subcortical lesions present a similar deficit in tonus modulation, causing a symmetric and homogeneous distribution of hypertonicity, which is predominant in the LLLL.

  7. Relationship between radiation dose estimation in patients submitted to abdominal tomography examination and the body mass index; Relacao entre a estimativa de dose de radiacao em pacientes submetidos a exame de tomografia computadorizada do abdomen e o indice de massa corporal

    Energy Technology Data Exchange (ETDEWEB)

    Capaverde, Alexandre da S.; Pimentel, Juliana; Froner, Ana Paula P., E-mail: alexandre.capaverde@acad.pucrs.br, E-mail: juliana.pimentel@pucrs.br, E-mail: ana.froner@pucrs.br [Hospital Sao Lucas (HSL/PUCRS), Porto Alegre, RS (Brazil); Silva, Ana Maria Marques da, E-mail: ana.marques@pucrs.br [Pontificia Universidade Catolica do Rio Grande do Sul (PUCRS), Porto Alegre, RS (Brazil). Fac. de Fisica

    2014-07-01

    Because of the radiation dose in computed tomography (CT) is relatively high, it is important to have an estimate of the dose to which the patient is submitted, considering parameters and correction factors, so that the value is closer to the real. The objective of this study is to relate the estimated dose in patients undergoing abdominal CT with BMI (Body Mass Index) groups, considering the specific size of the anatomical region. The work developed in a hospital in Porto Alegre, Brazil, using 16 Siemens Somatom Emotion equipment. We selected 30 adult that underwent to CT of the abdomen in January 2014. Of these, 13 using dose reduction mechanism (Care Dose), (Sample 1) and the rest without this mechanism (Sample 2). Registered weight, height, CTDI{sub vol} (Computed Tomography Dose Index) and anteroposterior and lateral diameter at the umbilicus. BMI and the correction factor for the dose estimates were calculated, according to the specific size of the abdomen. It was determined the percentage change between the CTDI{sub vol} values provided by CT and the value of CTDI{sub vol} after application of the correction factor, plus the average percentage change for each BMI group. The mean percentage change was between 54% and 19% for sample 1 and between 35% and 10% for sample 2, the lowest to highest BMI group. There was a reduction in the medium average percent with the increasing of the BMI groups in both samples. A larger sample of individuals for verification of results is required.

  8. Neutron stimulated emission computed tomography applied to the assessment of calcium deposition due to the presence of microcalcifications associated with breast cancer; Tomografia computadorizada de emissao estimulada por neutrons aplicada para avaliar a deposicao de calcio devido a presenca de microcalcificacoes associadas ao cancer de mama

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Rodrigo S.S.; Yoriyaz, Helio [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, (SP) (Brazil)

    2011-07-01

    In this paper we presented an application of the Neutron Stimulated Emission Computed Tomography (NSECT), which uses a thin beam of fast neutrons to stimulate stable nuclei in a sample, emitting characteristic gamma radiation. The photon energy is unique and it is used to identify the emitting nuclei. This technique was applied for evaluating the calcium isotopic composition changing due to the development of breast microcalcifications. A particular situation was simulated in which clustered microcalcifications were modeled with diameters less than 1.40 mm. In this case, neutron beam breast spectroscopy was successful in detecting the counting changes in the photon emission spectra for energies, which are characteristics of 4{sup 0C}a isotope in a low deposited dose rate. (author)

  9. Real-time three-dimensional echocardiographic left ventricular ejection fraction and volumes assessment: comparison with cardiac computed tomography; Comparacao entre a afericao da fracao de ejecao e dos volumes do ventriculo esquerdo, medidos com ecocardiografia tridimensional em tempo real e com tomografia computadorizada ultra-rapida

    Energy Technology Data Exchange (ETDEWEB)

    Vieira, Marcelo L.C.; Nomura, Cesar H.; Tranchesi Junior, Bernardino; Oliveira, Wercules A. de; Naccarato, Gustavo; Serpa, Bruna S.; Cury, Alexandre; Passos, Rodrigo B.D.; Nobrega, Marcel V. da; Funari, Marcelo B.G.; Pfefermam, Abhaham; Makdisse, Marcia; Fischer, Claudio H.; Morhy, Samira S., E-mail: luiz766@terra.com.br [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil)

    2008-10-15

    Background and objective: Few studies addressed the comparison between real-time 3D echocardiography (RT3DE) and cardiac computed tomography (CCT) concerning left ventricular ejection fraction and volumes assessment. We sought to compare both techniques regarding left ventricle (LV) ejection fraction function and volumes analysis. Methods: we studied by RT3DE (Philips IE 33, And, MA, USA) and by CCT (Toshiba, 64-slice, Otawara, Japan) 41 consecutive patients (29 males, 58 ± 11 yrs). We analysed by both techniques LVEF, LVEDV, LVESV. RT3DE and CCT data were compared by coefficients of determination (r: Pearson), Bland and Altman test and linear regression, 95% CI. Results: RT3DE data: LVEF ranged from 56.7 to 78.9 % (65.3 + 5.7 ); LVEDV ranged from 49.6 to 178.2 (88 + 27.5) mL; LVESV from 11.4 to 78 ( 33.9 + 13.7) mL. CCT data: LVEF ranged from 53 to 86 % (67.3 + 7.9 ); LVEDV ranged from 51 to 186 (106.4 + 30.7) mL; LVESV from 7 to 72 ( 35.1 + 13.8) mL. Correlations relative to RT3DE and CCT were: LVEF (r: 0. 7877, p<0.0001, 95 % CI 0.6327 to 0.8853 ); LVEDV (r:0.7671, p<0.0001, 95 % CI 0.5974 to 0.8745); LVESV (r: 0.8121, p<0.0001, 95 % CI 0.6659 to 0.8957). Conclusions: it was observed adequate correlation between real-time 3D echocardiography and cardiac computed tomography concerning ejection fraction and volumes assessment. (author)

  10. Juvenile nasopharyngeal angiofibroma - study of the tumor extension and vascularization through computerized tomography (CT) scan and angiography and the patient's age; Nasoangiofibroma juvenil - estudo da extensao e vascularizacao do tumor pela tomografia computadorizada e angiografia, e da idade do paciente

    Energy Technology Data Exchange (ETDEWEB)

    Sennes, Luiz Ubirajara

    1997-07-01

    The juvenile nasopharyngeal angiofibroma is a rare benign tumor that affects male adolescents. It is a fibro-vascular tumor with an exuberant intra tumor blood flow and irrigated by several arteries. It originates from the lateral and posterior region of the nasal cavity and, due to its characteristic multidirectional growth, widely affects the paranasal sinuses and skull base, sometimes invading the cranial fossa or the cheek. The determinant factors of its growth and vascularisation are unknown. Attempting to clarify them, 33 patients from the University of Sao Paulo Medicine were studied from 1983 to 1995, with complete history and radiological documentation (CT scan and angiography), as well as with histological confirmation of the diagnosis. In order to take only tumors with natural evolution, patients with recidivant tumor and those already submitted to any previous treatment were excluded. The parameters evaluate were: patient age and tumor extension (by classification, degree of invasion and number of compromised sites in CT scan) and vascularisation (by number and degree of participation of bilateral arteries in angiography). The se data were tabled and correlated one with each other. (author)

  11. Pilot project for the establishment of diagnosis reference level in pediatric computerized tomography in Rio de Janeiro city, RJ, Brazil; Projeto piloto para o estabelecimento de niveis de referencia de diagnostico em tomografia computadorizada pediatrica no municipio do Rio de Janeiro, RJ, Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Jesus, Fillipe Machado de

    2014-08-01

    Computed tomography (CT) is an important method of diagnostic imaging has been widely used around the world. However, this important diagnostic tool has led to a considerable increase in the frequency of examinations, often without proper clinical justification. Consequently, CT is one of the diagnostic procedures that contributes most to the collective dose. Scientific studies show that the concern in pediatric procedures should be even higher. Despite the fact that these patients have a higher radiosensitivity and a higher life expectancy, the protocols of the examinations are not optimized and adult protocols are applied. Moreover, a recent study performed in the United States showed that one third of the examinations was not justified. The aim of this study was to conduct a pilot study of dose indicators in pediatric CT in four hospitals, in order to verify the feasibility of the diagnostic reference levels establishment for the county of Rio de Janeiro. The dose descriptors were estimated from the beam dosimetry by applying the protocols used in each examination. The total patient sample included 358 children of different age groups. The results observed in examinations of whole trunk (routine chest, upper abdomen and pelvis) and upper abdomen in Institution A, for patients aged 5-10 years, indicated that the mAs values used were not properly selected for patients' body mass index, presenting however, conformity with UK reference levels. In the case of head CT scans and routine chest CT scans in Institution B, although patients aged 5-10 years have shown conformity with UK reference levels, the kV and mAs values used, in some examinations, were also inappropriate for the patient characteristics. Similar result was observed in examinations of head and high resolution chest for patients neonates, in Institution D. For head and routine chest examinations of 1-5 years' age group, was Institution B that showed the lowest DLP values. This result was due to the lowest CTDlyol values found therein. Comparisons of DLP values among institutions, for each age group in each kind of examination, also allowed observe a mean difference of 2248% in the Institution A's values in relation to the Institution D's values, for high resolution chest examinations of the 5-10 years age group. These results indicate that few efforts are being devoted to radiation protection in pediatric computed tomography, there is a high potential for optimization and that to establish tomographic good practices is essential the determination of diagnostic reference levels. (author)

  12. Retrospective study of computed tomography of nasal cavity in small animal at FMVZ - UNESP, Botucatu, and correlation of changes with cytological and/or histopathological exams; Estudo retrospectivo de tomografia computadorizada da cavidade nasal em pequenos animais na FMVZ - UNESP, Botucatu, e correlacao das alteracoes com os exames citologico e/ou histopatologico

    Energy Technology Data Exchange (ETDEWEB)

    Belotta, Alexandra Frey; Inamassu, Leticia Rocha; Mamprim, Maria Jaqueline; Machado, Vania Maria de Vasconcelos; Vulcano, Luiz Carlos, E-mail: a_fbelotta@yahoo.com.br [Universidade Estadual Paulista Julio de Mesquita Filho (FMVZ/UNESP), Botucatu, SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia. Dept. de Reproducao Animal e Radiologia Veterinaria; Zardo, Karen Maciel

    2012-07-01

    It was conducted a retrospective study of computed tomography (CT) scans of nasal cavity in small animal at this institution during the period of April 2007 through June 2012. In total, 47 CT scans were performed during the period and, of these, only 25 underwent additional exams (cytological and/or histopathological). 20 exams suggested a diagnosis, 4 were inconclusive and one had no change. A correlation was made between tomographic findings and cytological/histopathological diagnosis providing an accurate assessment of neoplastic versus non-neoplastic disease. (author)

  13. Prevalence of soft tissue calcifications in cone beam computed tomography images of the mandible = Prevalência de calcificações em tecido mole na região mandibular avaliadas por dois sistemas de tomografia computadorizada por feixe cônico

    Directory of Open Access Journals (Sweden)

    Nunes, Leiliane Ferreira da Silva

    2011-01-01

    Conclusão: Os sistemas de TCFC avaliados mostraram-se ferramentas valiosas na identificação de calcificações em tecido mole, embora as imagens não permitam exata localização destas calcificações

  14. Comparative study of muscular tonus in spastic tetra paretic cerebral palsy in children with predominantly cortical and subcortical lesions in computerized tomography of the skull; Estudo comparativo do tono muscular na paralisia cerebral tetraparetica em criancas com lesoes predominantemente corticais ou subcorticais na tomografia computadorizada de cranio

    Energy Technology Data Exchange (ETDEWEB)

    Iwabe, Cristina [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Ciencias Medicas. Dept. de Neurologia; Piovesana, Ana Maria Sedrez Gonzaga [Universidade Estadual de Campinas, SP (Brazil). Ambulatorio Multidisciplinar de Paralisia Cerebral e Neurologia Infantil

    2003-09-01

    The objective was to compare distribution and intensity of muscular tonus in spastic tetra paretic cerebral palsy (CP), correlating the clinical data with lesion location in the central nervous system. Twelve children aged two to four years old with predominantly cortical lesions (six children) and subcortical lesions (six children) were included. The tonus was analyzed in the upper (UULL) and lower limbs (LLLL) based on Durigon and Piemonte protocol. The result showed that there was no significant difference regarding tonus intensity and distribution in the UULL and LLLL in both groups. Comparing the upper and lower limbs of subjects in the same group, the LLLL presented more asymmetry and higher tonus intensity than the UULL. It was concluded that in this study children with CP as a result of predominantly cortical or subcortical lesions present a similar deficit in tonus modulation, causing a symmetric and homogeneous distribution of hypertonicity, which is predominant in the LLLL. (author)

  15. Influence of ASIR (Adaptative Statistical Iterative Reconstruction) variation in the image noise of computerized tomography for high voltage; Influência da variação do ASIR (Adaptative Statistical Iterative Reconstruction) no ruído da imagem de tomografia computadorizada para altas tensões

    Energy Technology Data Exchange (ETDEWEB)

    Mendes, L.M.M.; Pereira, W.B.R.; Vieira, J.G.; Lamounier, C.S.; Gonçalves, D.A.; Carvalho, G.N.P.; Santana, P.C., E-mail: lucasmoacir2010@hotmail.com [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil); Oliveira, P.M.C.; Reis, L.P., E-mail: paulomarcio2000@gmail.com [Centro de Desenvolvimento de Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)

    2017-07-01

    Computed tomography had great advances in the equipment used in the diagnostic practice, directly influencing the levels of radiation for the patient. It is essential to optimize techniques that must be employed to comply with the ALARA (As Low As Reasonably Achievable) principle of radioprotection. The relationship of ASIR (Adaptive Statistical Iterative Reconstruction) with image noise was studied. Central images of a homogeneous water simulator were obtained in a 20 mm scan using a 64-channel Lightspeed VCT tomograph of General Electric in helical acquisitions with a rotation time of 0.5 seconds, Pitch 0.984: 1, and thickness of cut 0.625 mm. All these constant parameters varying the voltage in two distinct values: 120 and 140 kV with use of the automatic current by the CAE (Automatic Exposure Control), ranging from 50 to 675 mA (120 kV) and from 50 to 610 mA (140kV), minimum and maximum values, respectively allowed for each voltage. Image noise was determined through ImageJ free software. The analysis of the obtained data compared the percentage variation of the noise in the image based on the ASIR value of 10%, concluding that there is a variation of approximately 50% when compared to the values of ASIR (100%) in both tensions. Dose evaluation is required in future studies to better utilize the relationship between dose and image quality.

  16. Computerized tomography with X-rays: an instrument in the analysis physico-chemical between formations and drilling fluids interactions; Tomografia computadorizada com raios-X: uma ferramenta na analise das interacoes fisico-quimicas entre as formacoes rochosas e fluidos de perfuracao

    Energy Technology Data Exchange (ETDEWEB)

    Coelho, Marcus Vinicius Cavalcante

    1998-12-31

    In this study it is demonstrated the applicability of the Computerized Tomography technique with x-rays to evaluate the reactivity degree between various drilling fluids and argillaceous sediments (Shales and Sandstones). The research has been conducted in the Rock-Fluid Interaction Pressure Simulator (RFIPS), where the possible physico-chemical alterations can be observed through successive tomography images, which are obtained during the flow of the fluid through the samples. In addition, it was noticed the formation of mud cake in Berea Sandstones samples in the RFIPS, though the Computerized Tomography with X-rays, when utilizing drilling fluids weighted with the baryte. (author) 35 refs., 38 figs., 5 tabs.

  17. Computerized tomography with X-rays: an instrument in the analysis physico-chemical between formations and drilling fluids interactions; Tomografia computadorizada com raios-X: uma ferramenta na analise das interacoes fisico-quimicas entre as formacoes rochosas e fluidos de perfuracao

    Energy Technology Data Exchange (ETDEWEB)

    Coelho, Marcus Vinicius Cavalcante

    1999-12-31

    In this study it is demonstrated the applicability of the Computerized Tomography technique with x-rays to evaluate the reactivity degree between various drilling fluids and argillaceous sediments (Shales and Sandstones). The research has been conducted in the Rock-Fluid Interaction Pressure Simulator (RFIPS), where the possible physico-chemical alterations can be observed through successive tomography images, which are obtained during the flow of the fluid through the samples. In addition, it was noticed the formation of mud cake in Berea Sandstones samples in the RFIPS, though the Computerized Tomography with X-rays, when utilizing drilling fluids weighted with the baryte. (author) 35 refs., 38 figs., 5 tabs.

  18. Tomografia computadorizada na análise dos padrões de calcificações nos tumores ósseos da bacia em pediatria: nova abordagem Computed tomography in the analysis of calcification patterns in pediatric bone tumors of the hip: a new approach

    Directory of Open Access Journals (Sweden)

    Gabriel Antônio de Oliveira

    2006-12-01

    Full Text Available OBJETIVO: No grupo pediátrico, o diagnóstico radiológico dos tumores dos ossos ilíacos, ísquios e púbis apresenta dificuldades e peculiaridades próprias, mas a literatura revisada não trata especificamente desse tema. Este trabalho pretende investigar a existência de padrões radiológicos confiáveis para o diagnóstico diferencial desses tumores. MATERIAIS E MÉTODOS: Foram revistos os achados radiológicos de tumores dos ossos do quadril em dez pacientes com idades entre 8 e 19 anos. RESULTADOS: Reação óssea (esclerose ou lise, reação periosteal (lamelar em camada única, múltiplas camadas ou radial, extensão do tumor no osso e grau de invasão das partes moles revelaram baixa especificidade. As calcificações nas partes moles, consideradas em conjunto, foram inespecíficas. Contudo, separando as próximas do osso comprometido, que apresentam formas e tamanhos variados - padrão I -, daquelas afastadas do osso, finas e amorfas - padrão II -, observamos que o padrão I foi totalmente inespecífico e o padrão II foi identificado nos três casos de osteossarcoma (100% e em apenas um dos casos de Ewing (16,6%. CONCLUSÃO: Neste material, as calcificações padrão II revelaram sensibilidade de 100% e especificidade de 90% para osteossarcoma. Contudo, sua importância pode não se limitar ao diagnóstico radiológico. As calcificações padrão II indicam, provavelmente, os sítios ideais para biópsia.OBJECTIVE: In the pediatric group, the radiological diagnosis of bone tumors of the hip is difficult and presents some peculiarities, but reviewed literature does not approach this specific problem. The objective of the present study was to investigate the existence of reliable radiological patterns for the differential diagnosis of these tumors. MATERIALS AND METHODS: Radiological findings of bone tumors of the hip in ten patients in the age range between 8 and 19 years have been reviewed. RESULTS: Bone reaction (sclerosis or lysis, periosteal reaction (lamellar with single or multiple layers, or radial, tumor extent in the bone and level of soft tissues invasion have presented low specificity. Soft tissue calcifications, when considered as a whole, were non-specific. However, when those calcifications with varied shapes and sizes, nearby the affected bone (pattern I were separated from those, thin and amorphous, away from the bone (pattern II, we have observed that the pattern I was totally non-specific, and the pattern II was found in the three cases of osteosarcoma (100% and in only one case of Ewing's sarcoma (16.6%. CONCLUSION: In the present study, pattern II calcifications have shown a 100% sensitivity and 90% specificity for osteosarcoma. However, their importance may be not limited to the radiological diagnosis. Pattern II calcifications indicate probably ideal sites for biopsy.

  19. Use of 99mTc from a commercial 99Mo/9mTc generator as yield tracer for the determination of 99Tc at low levels

    DEFF Research Database (Denmark)

    Hou, Xiaolin; Jensen, Mikael; Nielsen, Sven Poul

    2007-01-01

    The concentrations of Tc-99 and impurity radionuclides in the Tc-99m tracer solution obtained from a commercial Mo-99/Tc-99m generator were measured by gamma spectrometry and liquid scintillation counting. Mo-99 and Ru-103 were found in the Tc-99m eluate. A simple separation using two extra alumina...... cartridges was investigated to purify the eluate to obtain a suitable Tc-99m tracer with low Tc-99 concentration. The activity ratio of Tc-99/Tc-99m in the prepared Tc-99m solution is lower than 15 x 10(-9), which is higher than the theoretical ratio of less than 10 x 10(-9). The possible reason is discussed....... The Tc-99 in the 20 kBq spiked Tc-99m tracer was found to be less than 0.3mBq, which is lower than the detection limit of the radiometric method used for environmental samples. The purified Tc-99m eluate is used as yield tracer for the determination of low levels of Tc-99 in environmental samples. (c...

  20. Determination of Tc-99 in radioactive wastes; Determinacion de Tc-99 en desechos radiactivos

    Energy Technology Data Exchange (ETDEWEB)

    Rivera S, A. A.

    2015-07-01

    Tc-99 is a fission product and one of the most important radionuclides from the view point of safety assessment for the disposal of radioactive waste because of its long half-life (2.1 x 10{sup 5} years) and high mobility in soil-water systems, if this is released into the environment in significant quantities can concentrate on plants and animals. Tc-99 is a pure beta emitter with a maximum energy of 292 KeV, so their quantification imposes destructive methods to be analyzed by liquid scintillation. Therefore the quantification of Tc-99 in ion exchange resins requires of the mineralization of these and separation of Tc-99 of other radioisotopes present in the resin. Therefore the object of this thesis is to develop a quantification method of Tc-99 content in spent exchange resins. So in order to track the behavior of technetium during digestion exchange resins and radiochemical separation, given its high volatility, in this work the {sup 99m}Tc is used. To determine the degree of mineralization of the resins, an analysis was performed by chromatography. Subsequently the method used to determine the percentage of {sup 99m}Tc aerosolized during mineralization of resin is described. After the method for the radiochemical separation of {sup 99m}Tc is presented by liquid-liquid extraction using crown ether as extractant; for this testing was performed by varying the molarity of the extractant, the ratio of solvent extractant, type of digestion of the resin and the presence of Sr-85, in order to study the behavior of {sup 99m}Tc in the presence of this radioisotope. Finally, a track beta spectra of a sample of {sup 99m}Tc eluted from a generator {sup 99}Mo/{sup 99m}Tc function of time was performed. (Author)

  1. Clinical application of 99mTc-DTPA-HSA

    International Nuclear Information System (INIS)

    Kawamura, Yasuaki; Yamazaki, Junichi; Okuzumi, Ichio

    1989-01-01

    A newly developed blood pool imaging agent, Tc-99m DTPA-HSA (Tc-99m HSA-D), was clinically assessed in blood pool studies of patients with heart disease. Twenty mCi of Tc-99m HSA-D was iv injected to the patients. Similarly, conventional Tc-99m HSA was injected one week later for comparison. Blood counts of Tc-99m HSA-D were significantly higher than those of Tc-99m HSA at 30 minutes after iv injection (p<0.01) and at one, 3, and 6 hours (p<0.001). For the heart, liver, and lungs, sequential counts of Tc-99m HSA-D were also significantly higher than those of Tc-99m HSA. Free Tc-99m uptake in the stomach, thyroid gland, and kidneys was higher on Tc-99m HSA images than Tc-99m HSA-D images. Hepatic and pulmonary uptake of free Tc-99m that were visualized on Tc-99m HSA-D did not influence the diagnostic ability. None of the patients had clinical toxicity of Tc-99m HSA-D. The results indicate that Tc-99m HSA-D is a stable blood pool imaging agent. (Namekawa, K)

  2. A new detection method of 99Tc by nuclear excitation

    International Nuclear Information System (INIS)

    Sekine, T.; Yoshihara, Kenji; Nemeth, Zs.; Lakosi, L.; Veres, A.

    1989-01-01

    A new nuclear excitation process, 99 Tc(γ,γ') 99m Tc reaction, was applied for the first time to radioactivation analysis of technetium. Bremsstrahlung irradiation of 99 Tc samples gave the reaction product 99m Tc which emits γ-ray easily measurable by a semiconductor detector. The production rate of 99m Tc per μg 99 Tc was linearly correlated with the flux of bremsstrahlung. The detection limit of 99 Tc was estimated to be nanogram order (0.63 Bq 99 Tc) under the optimum irradiation condition. Possible interference by 100 Ru(γ, p) 99m Tc reaction was also studied, which could be discriminated from the (γ,γ') reaction by simultaneously occurring 98 Ru(γ,p) 97 Ru reaction. (author) 17 refs.; 7 figs

  3. Análise computadorizada de imagens de plântulas para avaliação do vigor de sementes de milho, em comparação a testes tradicionais

    OpenAIRE

    Danielle Otte Carrara Castan

    2015-01-01

    O aprimoramento dos testes de vigor e a possibilidade da inserção de novos recursos computacionais para avaliação eficiente do potencial fisiológico de sementes tem despertado grande interesse da pesquisa e dos tecnologistas de sementes. O objetivo desta pesquisa foi avaliar o potencial fisiológico de sementes de milho utilizando sistemas de análise computadorizada de imagens de plântulas (SVIS® e Vigor-S), comparativamente a outros métodos utilizados para avaliação do vigor dessa espécie. Ut...

  4. Can tumor uptake Tc-99m MDP

    International Nuclear Information System (INIS)

    Yang, Y.S.F.; Zeng, Z.J.; Yao, Y.M.; Shi, S.M.P.; Shi, S.Z.Y.

    2002-01-01

    Aim: To study a distribution of Tc-99m MDP in mice bearing tumor cell lines. Methods: The uptake of Tc-99m MDP was analyzed in seven human tumor cell lines (SPC-A1 adenocarcinoma of lung cancer, P37 Breast cancer, T24 Bladder cancer, SKOV2 Ovary carcinoma, Hela-229 Cervical carcinoma, Osteosarcoma, A375 Melanoma) and one mouse lung cancer cell line (Lewis). They were transplanted into 13, 4, 5, 5, 4, 5 athymic mice, 6 SCID nude mice and 4 C57 black mice, respectively. Approximately 10(7) cells of each cell line were injected subcutaneously into a right chest of mouse. After 5∼6 weeks, the Tc-99m MDP scintigraphy were determined 5-6 hours after i.v. injection of 74MBq in 0.05ml every mouse. Result: Biodistribution and tumor uptake MDP was different in the various cell types investigated. Region of interests (RIOs) placed on a small part of the tumor and horizontal copied to left chest or spine of mice in Tc-99m MDP imaging and the average count ratio (tumor to background ratio: T/B, tumor to spine ratio: T/NT) in each ROI was calculated. 13 nude mice bearing the adenocarcinoma (SPC-A1) were sacrificed and biodistribution was determined after Tc-99m MDP scintigraphy. Results were expressed as % injected dose/gram (%ID/g), mean±SD. T-ulcer=ulcer of tumor, T-round=surrounding of tumor, T-center=the center of tumor, Thor-sp=thoracic spine, Lum-ver=lumbar vertebra, LN=lymph node. Conclusions: Tumor can uptake Tc-99m MDP including adenocarcinoma. Higher uptake rate in the center tissue of tumor is than other part of tumor. It maybe connected with necrosis or fibrosis of tumor

  5. Simple determination of 99Tc in radioactive waste using Tc extraction disk and imaging plates

    International Nuclear Information System (INIS)

    Kameo, Y.; Katayama, A.; Hoshi, A.; Haraga, T.; Nakashima, M.

    2010-01-01

    A simple method was developed for determination of 99 Tc in low-level radioactive waste: Technetium-99 retained by a solid phase extraction disk was directly measured with imaging plates system. It was found that more than 97% of Tc were retained by the disk from a solution of pH 2 to 12, whereas depth profile of Tc in the disk, which greatly influences the counting efficiency, depended on solution pH. The present method was successfully applied to actual radioactive liquid waste samples arising from nuclear research facilities.

  6. Computerized electrocardiography in American pit bull terrier dogsEletrocardiografia computadorizada em cães da raça American pit bull terrier

    Directory of Open Access Journals (Sweden)

    Mauro José Lahm Cardoso

    2013-10-01

    Full Text Available Electrocardiography (ECG is an essential examination for evaluation of patient with heart disease is great importance the diagnosis of arrhythmias. The examination can determine source f rhythm and frequency depolarization heart, providing information in clinical status myocardium, since deflections P-QRS-T tracing can be altered by disease or physiological factor. With advancement of computer technology, computerized electrocardiography has been used in human medicine as auxiliary diagnostic method and currently is being increasingly used in veterinary medicine. The objectives this study were to study e computerized electrocardiographic parameters in dogs breed American Pit Bull Terrier, comparing them with patterns species. In present study, we evaluated electrocardiographic examinations 42 dogs the breed American Pit Bull clinically healthy, 22 males and 20 females, aged between 1 and 6 years. Sinus rhythm was observed in 57% of dogs showed sinus rhythm and only 26% were wandering pacemaker. The electrocardiographic values obtained from these dogs computerized ECG were within the normal range of species, except the duration of the P wave which had longer than 0.04 seconds in 24% of dogs. We conclude that the dogs of the breed American Pit Bull Terrier have the same electrocardiographic values obtained in other breeds by the computerized method, except for the increase in P-wave duration. A eletrocardiografia (ECG é um exame essencial para avaliação do paciente com doença cardíaca, sendo de grande importância para o diagnóstico das arritmias. O exame pode determinar a origem do ritmo e a freqüência de despolarização do coração, fornecendo informações do estado clínico do miocárdio, uma vez que as deflexões P-QRS-T do traçado podem ser alteradas por uma enfermidade ou fator fisiológico. Com o avanço da informática, a eletrocardiografia computadorizada tem sido utilizada na medicina humana e veterinária como método de

  7. Efeitos da ibopamina 2% tópica nos resultados da campimetria visual computadorizada Effects of 2% ibopamine eye drops on computerized visual field results

    Directory of Open Access Journals (Sweden)

    Mara Agi Pigini

    2009-06-01

    Full Text Available OBJETIVO: Avaliar os efeitos do uso do colírio de ibopamina a 2% nos resultados da campimetria visual computadorizada em indivíduos normais. MÉTODOS: Voluntários oriundos do CEROF-UFG, sem alterações ao exame oftalmológico que pudessem afetar o campo visual foram selecionados. Os indivíduos foram submetidos a exame de perimetria computadorizada SITA-standard 24-2 antes e após dilatação com o colírio de ibopamina a 2% ou ciclopentolato, com intervalo mínimo de 3 dias entre si e em ordem aleatória. Índices globais e número de pontos alterados foram comparados entre os grupos. RESULTADOS: Foram avaliados 30 olhos de 30 indivíduos normais. Não houve diferença estatisticamente significativa entre o "mean deviation" (MD nos pacientes não dilatados e nos mesmos após a instilação da ibopamina (MD: -1,05 ± 0,26 dB vs. -1,47 ± 0,20 dB, P=0,08, o que ocorreu após cicloplegia (MD: -3,19 ± 0,29 dB, PPURPOSE: To evaluate the influence of 2% ibopamine eye drops on the results of computerized visual field exams. METHODS: Normal volunteers from CEROF-UFG were selected, with no variance in the ophthalmologic examination that could affect the visual field test. The volunteers underwent computerized visual field test before and after dilation with 2% ibopamine eye drop or cyclopentolate, with a minimum interval of three days between them and in a random order. Global indices and number of altered points were compared between the groups. RESULTS: Thirty eyes of 30 normal individuals were selected. There was no statistically significant difference on Mean Deviation (MD before and after dilation with ibopamine (MD: -1.05 ± 0.26 dB vs. -1.47 ± 0.20 dB, P=0.08. However, after cycloplegia (MD: -3.19 ± 0.29 dB, there was a significant difference on MD (P<0.001 for both ibopamine and pre-dilation. No significant difference was detected in the Pattern Standard Deviation when comparing ibopamine with pre-dilation and cycloplegia values, but it

  8. Análise Computadorizada da Cardiotocografia Anteparto em Gestações de Alto Risco Computerized Antepartum Cardiotocography Analysis in High Risk Pregnancies

    Directory of Open Access Journals (Sweden)

    Roseli Mieko Yamamoto Nomura

    2002-01-01

    Full Text Available Objetivos: analisar a freqüência dos resultados das cardiotocografias computadorizadas realizadas em gestantes de alto risco e relacionar o critério proposto pelo sistema com os resultados perinatais. Métodos: estudamos prospectivamente 233 gestantes de alto risco que realizaram 485 cardiotocografias computadorizadas. Foram excluídos casos de anomalias fetais e os exames com perda de sinal superior a 20% (proporção de episódios de 3,75 milissegundos do traçado onde não se constata intervalo de pulso por perda de captação dos sinais de batimentos cardíacos fetais. Para estudo da associação da cardiotocografia com os resultados perinatais, analisou-se o último exame realizado na semana anterior ao parto (71 casos, excluindo-se casos com diagnóstico de diástole zero ou reversa na dopplervelocimetria das artérias umbilicais. Resultados: após a exclusão de 33 exames com perda de sinal superior a 20%, constatou-se que 404 cardiotocografias foram caracterizadas como normais (83,3%. Quanto à duração do exame, em 62,1% foi de até 20 minutos e em 79,0% de até 30 minutos. A análise das correlações com os resultados perinatais demonstrou associação significativa (pPurpose: to study computerized cardiotocography performed in high-risk pregnancies, analyze the results, and correlate the criteria to perinatal results. Patients and Methods: two hundred and thirty-three high-risk pregnancies were studied prospectively, performing a total of 485 computerized cardiotocographies. The exclusion criteria included fetal anomalies and signal loss over 20% (proportion of 3.75-millisecond periods in which there were no valid pulse intervals. The perinatal results of 71 pregnancies were correlated to the last cardiotocography, performed at least seven days before birth, excluding patients with absent or reversed end diastolic velocities in the umbilical arteries. Results: thirty-three examinations with signal loss over 20% were excluded. The

  9. Process modifications of obtaining Tc-99m by solvent extraction

    International Nuclear Information System (INIS)

    Leon, A.; Verdera, S.

    1978-01-01

    This paper describes a modification in the process to obtaining Tc-99m by the extraction method of solvent from Mo-99 produced by irradiation. Tc-99m is considered an ideal radionuclide for medical and biological applications

  10. MIBI-99mTc mammary scintigraphy

    International Nuclear Information System (INIS)

    Mayosky, Maria C.; Parma, Elvira P.; Armesto, Amparo M.; Zarlenga, Ana C.; Cresta, Carlos; Azar, Maria E.; Noblia, Cristina

    1999-01-01

    121 patients suspected of breast cancer were studied with MIBI- 99m Tc to evaluate the suitability of the mammary scintigraphy in patients with doubtful cancer diagnosis.The results show 93 % sensitivity and 95 % specificity and indicate the usefulness of this procedure to increase the accuracy of the diagnosis

  11. Participation in CEN TC 335 TC343 Chemical Test Methods. Final report; Deelname CEN TC 335 TC343 Chemical Testmethods. Eindrapportage

    Energy Technology Data Exchange (ETDEWEB)

    Bakker, F.P. [ECN Engineering en Services, Petten (Netherlands)

    2006-12-15

    An overview is given of the work that has been done on the standardization of methods for the characterization of biofuels and solid recovered fuels (SRF). For biofuels a complete set of prestandards is available, conversion of pre-standards to standards is in good progress. The development of a standard biocarbon content method based on the {sup 14}C isotope measurement is in good progress. This standard could be an important tool for carbon dioxide trading purposes. CEN is the European Commission for Standardization, TC 335 is the Technical Committee 335 on Solid Biofuels, and TC 343 is the Technical Committee on Solid Recovered Fuels. [Dutch] In de periode september 2005 tot december 2006 zijn Europese standaarden voor de karakterisering van biobrandstoffen beschikbaar gekomen. Voor een aantal parameters is nader onderzoek vereist en deels gaande. Dankzij de ervaring die in Nederland is opgedaan met Nationale Technische Afspraken (NTA's) voor vaste biobrandstoffen heeft onze bijdrage aan de Europese normering de invoering daarvan zeker bespoedigd. De 14C groendeel bepaling begint terrein te winnen en zal in de nabije toekomst ook bij verdere implementatie van het Kyoto protocol een rol gaan spelen. CEN is de European Commission for Standardization, TC 335 is de Technical Committee 335 over Solid Biofuels, en TC 343 is de Technical Committee over Solid Recovered Fuels.

  12. Tc Generator Development: Up-to-Date Tc Recovery Technologies for Increasing the Effectiveness of Mo Utilisation

    Directory of Open Access Journals (Sweden)

    Van So Le

    2014-01-01

    Full Text Available A review on the Mo sources available today and on the Tc generators developed up to date for increasing the effectiveness of Mo utilisation is performed in the format of detailed description of the features and technical performance of the technological groups of the Mo production and Tc recovery. The latest results of the endeavour in this field are also surveyed in regard of the technical solution for overcoming the shortage of Mo supply. The technological topics are grouped and discussed in a way to reflect the similarity in the technological process of each group. The following groups are included in this review which are high specific activity Mo: the current issues of production, the efforts of more effective utilisation, and the high specific activity Mo-based Tc generator and Tc concentration units; low specific activity Mo: the Mo production based on neutron capture and accelerators and the direct production of Tc and the methods of increasing the specific activity of Mo using Szilard-Chalmers reaction and high electric power isotopic separator; up-to-date technologies of Tc recovery from low specific activity Mo: the solvent extraction-based Tc generator, the sublimation methods for Mo/Tc separation, the electrochemical method for Tc recovery, and the column chromatographic methods for Tc recovery. Besides the traditional Tc-generator systems, the integrated Tc generator systems (Tc generator column combined with postelution purification/concentration unit are discussed with the format of process diagram and picture of real generator systems. These systems are the technetium selective sorbent column-based generators, the high Mo-loading capacity column-based integrated Tc generator systems which include the saline-eluted generator systems, and the nonsaline aqueous and organic solvent eluent-eluted generator systems using high Mo-loading capacity molybdategel and recently developed sorbent columns. Tc concentration methods used in the

  13. Studio del danneggiamento mediante tomografia in luce del sincrotrone: impatto di un cono d’ombra sulla qualità finale delle ricostruzioni

    Directory of Open Access Journals (Sweden)

    Andrea Bernasconi

    2010-07-01

    Full Text Available Un’accurata osservazione della geometria tridimensionale di cricche e difetti è necessaria per lo studio dei meccanismi alla base del processo di danneggiamento. I metodi convenzionali utilizzati a questo scopo sono distruttivi o non possiedono una sufficiente risoluzione. Le tecniche di imaging che utilizzano la luce di sincrotrone, ed in particolare la microtomografia (micro-CT a raggi X, invece, uniscono i vantaggi di una tecnica non distruttiva ad un’elevata risoluzione spaziale e risultano quindi particolarmente interessanti. Un limite all’applicazione di questa tecnica è costituito dalla propensione della cricca a richiudersi una volta rimosso il carico che ha provocato il danneggiamento, superabile attraverso l’impiego di un dispositivo in grado di esercitare un carico di trazione durante l’acquisizione dei dati. Facendo riferimento al set-up sperimentale della linea SYRMEP di Elettra, il sincrotrone di Trieste, e tralasciando per il momento i vincoli legati a pesi e ingombri, è possibile pensare di inserire tra camera di ionizzazione e CCD una macchina per prove di trazione mono-colonna commerciale, in grado di mantenere aperto il difetto per tutta la durata della tomografia. In questo lavoro viene valutato l’impatto di questo vincolo sulla qualità finale delle ricostruzioni.

  14. Emission of Tc-99 from nuclear facilities

    International Nuclear Information System (INIS)

    Luxenburger, H.J.; Schuettelkopf, H.; Bohn, B.

    1984-11-01

    No noticeable Tc-activities are emitted from nuclear power stations. The emissions with the gaseous effluents exceed but rarely the detection limit of 25 nCi/h. Likewise, the emission with the liquid effluents remains below the detection limit of about 0.5 nCi/m 3 . Neither can a remarkable emission be recorded from the facilities of the Central Decontamination Services Department (HDB) of KfK. The emissions from the evaporation system for low level solutions and from the evaporation system for low level solutions and from the incineration facility for solid wastes do not exceed or rarely exceed to a minor extent the detection limit of 0.3 pCi/m 3 waste air. Also with the liquid effluents only minor Tc-amounts are discharged of 0.3 nCi/m 3 at the maximum. In the distillate of the medium level solutions discharged from the Karlsruhe Reprocessing Plant (WAK) to HDB as so-called tritiated water 2 nCi/m 3 Tc-99 at the maximum are contained. Only in the gaseous effluents from the evaporation system for medium level solutions emissions of up to 14 pCi/m 3 can be detected. The detection limits are almost permanently exceeded by the gaseous effluents from WAK. Small amounts of Tc-99 of 7 pCi/m 3 exhaust air at the maximum are released to the environment. However, the amount of Tc accumulated over the sampling period is insignificant from the radioecological point of view. (orig./HP) [de

  15. Occurrence and behaviour of Tc in the environment

    International Nuclear Information System (INIS)

    Luxenburger, H.J.; Schuettelkopf, H.

    1984-08-01

    A literature research was performed about the occurence and the behaviour of Tc in the environment. About 3600 publications, published between 1925 und 1983, were evaluated. The actual knowledge about Tc in the environment within extended regions is fragmentary. A lot of necessary informations about the behaviour of Tc in the environment are lacking completely. (orig.) [de

  16. Tc Chemistry in HLW: Role of Organic Complexants

    International Nuclear Information System (INIS)

    Hess, Nancy S.; Conradsen, Steven D.

    2003-01-01

    Tc complexation with organic compounds in tank waste plays a significant role in the redox chemistry of Tc and the partitioning of Tc between the supernatant and sludge components in waste tanks. These processes need to be understood so that strategies to effectively remove Tc from high-level nuclear waste prior to waste immobilization can be developed and so that long-term consequences of Tc remaining in residual waste after sludge removal can be evaluated. Only limited data on the stability of Tc-organic complexes exists and even less thermodynamic data on which to develop predictive models of Tc chemical behavior is available. To meet these challenges we are conducting a research program to study to develop thermodynamic data on Tc-organic complexation over a wide range of chemical conditions. We will attempt to characterize Tc-speciation in actual tank waste using state-of-the-art analytical organic chemistry, separations, and speciation techniques to validate our model. On the basis of such studies we will develop credible model of Tc chemistry in HLW that will allow prediction of Tc speciation in tank waste and Tc behavior during waste pretreatment processing and in waste tank residuals

  17. Mismatched uptake of Tc-99m-ECD and Tc-99m-HMPAO in subacute cerebral infarction: Tc-99m-ECD for viability and Tc-99m-HMPAO for flow restoration

    Energy Technology Data Exchange (ETDEWEB)

    Lee, D. S.; Hyun, I. Y.; Kim, S. K. [College of Medicine, Seoul National Univ., Seoul (Korea, Republic of)] [and others

    1997-07-01

    Tc-99m-HMPAO reflects tissue perfusion but Tc-99m-ECD uptake is affected by tissue viability in addition to tissue perfusion which the varied state of cellular retention of Tc-99m-ECD reflects. Luxuriously perfused area on Tc-99m-HMPAO SPECT implies that this cortex was already reperfused either spontaneously or after thrombolysis and that accompanied paralysis of vascular reactivity in those zones warms progressive deterioration. We tried to find out if we can use sequential Tc-99m-ECD/Tc-99m-HMPAO SPECT to reveal cortical perfusion and severity and range of risky areas of cerbral cortex despite reperfusion in sub-acute infarction. In 13 patients (M ; F =7 : 6, mean age 57 (range: 26-84)) with cortical (n=12) and basal ganglia infarction (1), we performed sequential Tc-99m-ECD/Tc-99m-HMPAO SPECT at the same position. At first, 555 MBq of Tc-99m-ECD was injected and imaged and then 1110 MBq of Tc-99m-HMPAO was injected again and imaged with the patients in situ, and the first image (Tc-99m-ECD) and the subtracted image (2nd- 1st : Tc-99m-HMPAO) were compared slice by slice. Study was done from 3 days to 31 days (16{+-}9) after ictus. Tc-99m-ECD uptake was always less than or equal to Tc-99m-HMPAO uptake at the lesion in all cases. Luxury perfusion was prominent in four patients. Mismatched uptake was found in 10 patients. Severity of mismatch showed diverse spectrum and was ranged from total middle cerebral artery territory (1 case) to peripheral thin zones around infarction (2 cases). The other 7 showed intermediate amount of tissues with mismatch , i.e., Tc-99m-ECD defects where Tc-99m-HMPAO uptake is in part increased, normal or decreased. Upon discharge, patients having more uptake with Tc-99m-ECD predicted improvement. Patients having mismatched uptake went dichotomous way. In conclusion, Tc-99m-ECD/Tc-99m-HMPAO sequential SPECT is feasible and reveal both tissue perfusion (Tc-99m-HMPAO ) and discrepant Tc-99m-ECD uptake probably reflecting viability in acute

  18. Gunshot wounds to the head. Correlations between CT and clinical findings, neurosurgical treatment and long-term sequels; Traumi cranio-encefalici da proiettile: correlazione tra tomografia computerizzata, clinica, trattamento neurochirurgico e sequele a distanza

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; Nocera, V. [Ospedale S. Giovanni di Dio, Frattamaggiore, NA (Italy). Servizio di Radiologia; De Rosa, A.; Nunziata, A. [Ospedale Loreto Mare, Neaples (Italy). Servizio di Radiologia; Rossi, E.; Brunese, L. [Universita' degli Studi Federico II, Neaples (Italy). Ist. di Scienze Radiologiche; Tuccillo, M. [Azienda Ospedaliera di Rilievo Nazionale A. Cardarelli, Neaples (Italy). Servizio di Radiologia; Grassi, R. [Seconda Universita' degli Studi, Neaples (Italy). Ist. di Radiologia

    2000-03-01

    With the aim of demonstrating the usefulness of computerised tomography (CT) findings in the planning of brain neurosurgery in gunshot victims, for prompt and successful treatment, 30 patients with brain gunshot wounds were examined with CT over 5 years. The mortality rate of firearm wounds of the skull base was 34% higher than that of the hemisphere; this is due to carotid hemorrhage and midbrain damage. Such traumas require emergency radiological diagnosis and neurosurgical treatment because of their severity and early irreversible complications. Complex operations and skilled surgeons may prevent disabling postoperative sequels. CT findings are indispensable and must be correctly interpreted. The radiologist and the neurosurgeon must collaborate closely and both must consider several diagnostic factors affecting surgical planning. [Italian] Scopo dello studio e' stato quello di dimostrare l'utilita' della semeiologia della tomografia computerizzata in relazione con la pianificazione dell'intervento neochirurgico, al fine di attuare con tempestivita' interventi chirurgici soddisfacenti e meno lesivi. Lo studio comprende 30 casi di lesioni cranio-encefaliche da arma da fuoco esaminate con tomografia computerizzata nel periodo di 5 anni. Materiali e metodi utilizzati sono analiticamente descritti. L'esperienza dimostra che nelle lesioni da arma da fuoco del basicranio si nota una mortalita' del 34% superiore rispetto a quelle piu' craniali come quelle emisferiche in relazione a emorragie carotidee e lesioni tronco-mesencefaliche. Tali traumi esigono diagnosi radiologica e terapia neurochirurgica d'urgenza per la gravita' e le precoci complicanze irreversibili. Cio' richiede interventi complessi e manualita' esperte e rapide al fine di evitare sequele postoperatorie invalidanti. La corretta e indispensabile interpretazione dei segni radiologici della tomografia computerizzata deve avvenire in stretta

  19. Aparência tomográfica dos discos intervertebrais mineralizados em cães da raça Dachshund Miniatura

    Directory of Open Access Journals (Sweden)

    D. Baraúna Júnior

    Full Text Available RESUMO Objetivou-se com este trabalho descrever os aspectos de tomografia computadorizada de discos intervertebrais de cães da raça Dachshund com um ano de idade, assim como quantificar, qualificar e localizar a mineralização nos componentes do DIV e no espaço intervertebral da coluna vertebral. Dez cães dessa raça, com um ano de idade, foram submetidos à tomografia computadorizada (TC. Nas imagens de reconstrução sagital dos animais, procedeu-se à identificação de sete DIV em cada animal, entre as vértebras T9 e L3, totalizando a análise de 70 DIV. Entre os DIV mineralizados, a presença da alteração foi determinada quanto à localização no núcleo pulposo (NP, no anel fibroso (AF e em AF/NP. Dos 70 DIV avaliados, 45 foram considerados como mineralizados. Entre os classificados como mineralizados, 20% (9/45, 17,8% (8/45 e 62,2% (28/45 estavam localizados nas regiões do NP, AF e AF/NP, respectivamente. A mineralização encontrada neste estudo esteve caracterizada por aumento de atenuação radiográfica com densidade mineral na topografia do DIV, havendo variações da localização e da radiodensidade de área calcificada entre animais e DIV no mesmo indivíduo. As alterações relativas à mineralização dos DIV podem ser classificadas tomograficamente quanto à localização da alteração no disco em AF, NP e AF/NP.

  20. Targeting osteomyelitis with complete [99mTc]besilesomab and fragmented [99mTc]sulesomab antibodies: kinetic evaluations

    International Nuclear Information System (INIS)

    GRATZ, Stefan; KEMKE, Bendix; KEIZE, Patrik; KAMPEN, Wim U.; LUSTER, Markus; HÖFFKEN, Helmut

    2016-01-01

    The aim of this retrospective study was to compare the targeting of “pure” osteomyelitis (i.e., without surrounding soft tissue infection) by directly 99mTc-labelled complete immunoglobulin G (IgG) monoclonal antibody (MAb) ([99mTc]besilesomab) and by directly 99mTc-labelled fragment antigen-binding (FAb) MAb ([99mTc]sulesomab) in relation to their kinetic fate. A total of 73 patients with “pure” osteomyelitis were examined with [99mTc]besilesomab, (Scintimun®, IBA/CIS bio international, Saclay, France; N.=38) and [99mTc]sulesomab (LeukoScan®, Immunomedics Inc., Morris Plains, NJ, USA; N.=35). Kinetic data were deduced from whole-body and single-photon emission computed tomographic scans, performed 10 minutes to 24 hour p.i. (region-of-interest technique [ROI]). In targeting “pure” osteomyelitis, sensitivities at 1-4 hours were found to be higher for [99mTc]sulesomab (44% and 80% for [99mTc]besilesomab and [99mTc]sulesomab, respectively) but at significantly lower target/background (T/B) ratios than with [99mTc]besilesomab (1.8±0.3 versus 1.4±0.5 for [99mTc]besilesomab and [99mTc]sulesomab respectively; P<0.01). With [99mTc]besilesomab, there was a continuous osteomyelitis uptake over 24 hours, whereas with [99mTc]sulesomab, the maximal uptake occurred mostly within 1-4 hours, with subsequent clearance being slower for antigen-bound activity than for nonspecific background. Hence, diagnosis was possible mostly after 4h with [99mTc]sulesomab but often not before 24 hours with [99mTc]besilesomab, the later increasing significantly (P<0.01) in sensitivity (87% and 84% for [99mTc]besilesomab and [99mTc]sulesomab, respectively). These results show that the higher sensitivity of [99mTc]sulesomab in osteomyelitis targeting at earlier p.i. times does not rely on an increased antibody uptake but on a more rapid clearance of nonspecific background activity due to faster metabolism and excretion. Intact [99mTc]besilesomab show a slow, continuous uptake

  1. New superconductors from granular to high T$_{c}$

    CERN Document Server

    Deutscher, Guy

    2018-01-01

    How new are the high Tc superconductors, as compared to the conventional low Tc ones? In what sense are these oxides different from regular metals in their normal state? How different is the mechanism for high Tc superconductivity from the well-known electron-phonon interaction that explains so well superconductivity in metals and alloys? What are the implications of the new features of the high Tc oxides for their practical applications? This interesting book aims to provide some answers to those questions, drawing particularly on similarities between the high Tc oxides and granular superconductors, which also present a short coherence length, a small superfluid density and an inhomogeneous structure.

  2. New superconductors from granular to high T$_{c}$

    CERN Document Server

    Deutscher, Guy

    2006-01-01

    How new are the high Tc superconductors, as compared to the conventional low Tc ones? In what sense are these oxides different from regular metals in their normal state? How different is the mechanism for high Tc superconductivity from the well-known electron-phonon interaction that explains so well superconductivity in metals and alloys? What are the implications of the new features of the high Tc oxides for their practical applications? This book aims to give some answers to those questions, drawing particularly on similarities between the high Tc oxides and granular superconductors, which also present a maximum of their critical temperature near the metal-insulator transition.

  3. Bioaccumulation and chemical modification of Tc by soil bacteria

    International Nuclear Information System (INIS)

    Henrot, J.

    1989-01-01

    Bioaccumulation and chemical modification of pertechnetate (TcO 4 -) by aerobically and anaerobically grown soil bacteria and by pure cultures of sulfate-reducing bacteria (Desulfovibrio sp.) were studied to gain insight on the possible mechanisms by which bacteria can affect the solubility of Tc in soil. Aerobically grown bacteria had no apparent effect on TcO 4 -; they did not accumulate Tc nor modify its chemical form. Anaerobically grown bacteria exhibited high bioaccumulation and reduced TcO 4 -, enabling its association with organics of the growth medium. Reduction was a metabolic process and not merely the result of reducing conditions in the growth medium. Association of Tc with bacterial polysaccharides was observed only in cultures of anaerobic bacteria. Sulfate-reducing bacteria efficiently removed Tc from solution and promoted its association with organics. Up to 70% of the total Tc in the growth medium was bioaccumulated and/or precipitated. The remaining Tc in soluble form was entirely associated with organics. Pertechnetate was not reduced by the same mechanism as dissimilatory sulfate reduction, but rather by some reducing agent released in the growth medium. A calculation of the amount of Tc that could be associated with the bacterial biomass present in soil demonstrates that high concentration ratios in cultures do not necessarily imply that bioaccumulation is an important mechanism for long-term retention of Tc in soil

  4. Experimental measurement of the scatter fraction in skull and body CT for teams 64- slice computed tomography; Medida experimental de la fraccion de dispersion TC en craneo y cuerpo para equipo de tomografia computarizada de 64 cortes

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, G.; Haro, G.; Herrador, M.

    2011-07-01

    Different formalisms for the calculation of shielding in Cf equipment, the proposed document 147 of NCRP are widely accepted. Of the three methods mentioned in the protocol, two involve the use of two independent factor a of equipment, called scatter fraction CT in skull and body. Interestingly, the experimental measurement of the same, especially in those models following the publication of the document, which are also coincides with the highest number of detector channels and overall a greater radiation beam in the z axis.

  5. Evaluation of the absorbed dose to the kidneys due to Tc99m (DTPA) / Tc99m (Mag3) and Tc99m (Dmsa)

    International Nuclear Information System (INIS)

    Vasquez A, M.; Murillo C, F.; Castillo D, C.; Rocha J, J.; Sifuentes D, Y.; Sanchez S, P.; Idrogo C, J.; Marquez P, F.

    2015-10-01

    The absorbed dose in the kidneys of adult patients has been assessed using the biokinetics of radiopharmaceuticals containing Tc 99m (DTPA) / Tc 99m (Mag3) or Tc 99m (Dmsa).The absorbed dose was calculated using the formalism MIRD and the Cristy-Eckerman representation for the kidneys. The absorbed dose to the kidneys due to Tc 99m (DTPA) / Tc 99m (Mag3), are given by 0.00466 mGy.MBq -1 / 0.00339 mGy.MBq -1 . Approximately 21.2% of the absorbed dose is due to the bladder (content) and the remaining tissue, included in biokinetics of Tc 99m (DTPA) / Tc 99m (Mag3). The absorbed dose to the kidneys due to Tc 99m (Dmsa) is 0.17881 mGy.MBq -1 . Here, 1.7% of the absorbed dose is due to the bladder, spleen, liver and the remaining tissue, included in biokinetics of Tc 99m (Dmsa). (Author)

  6. Accumulation of Tc-99m-MIBI and Tc-99m-tetrofosmin in tumor cells. Uptake and washout studies

    International Nuclear Information System (INIS)

    Rodrigues, M.; Aghajanian, A.A.; Sinzinger, H.; Kalinowska, W.; Zielinski, C.

    2002-01-01

    Aim: To investigate in-vitro the uptake and washout of Tc-99m-MIBI and Tc-99m-tetrofosmin in human breast adenocarcinoma and soft tissue sarcoma cell lines. Methods: The uptake of Tc-99m-MIBI and Tc-99m-tetrofosmin (at 37 0 C, 10, 30 and 60 minutes after incubation with 7.4x10E5 Bq each tracer) was investigated in breast adenocarcinoma MCF-7 and SK-BR-3 cells, synovial sarcoma SW 982 cells and chondrosarcoma SW 1353 cells (concentration of 1x10E6 cells/ml incubation medium). Tracer uptake in cells incubated with ouabain (Na/K-ATPase pump inhibitor; 100 μM and 1mM; 15 and 30 minutes), nigericin (increases mitochondrial potential and disrupts cell membrane potential; 5 and 50 μg/ml; 15 minutes) and carbonyl cyanide m-chlorophenylhydrazone (CCCP) (depolarizes mitochondrial membrane; 10 and 100 μM; 30 minutes) was compared to that in cells without incubation with chemical agents (control cells). The washout (at 37 0 C, 10-60 minutes, 30 and 60 minutes after tracer incubation) of Tc-99m-MIBI and Tc-99m-tetrofosmin was studied in MCF-7 cells, SK-BR-3 cells , SW 1353 cells and fibrosarcoma SW 684 cells. Results: Cellular tracer uptake decreased with ouabain (decrease of Tc-99m-tetrofosmin > Tc-99m-MIBI in SK-BR-3 cells and SW 982 cells) and increased with nigericin (increase of Tc-99m-MIBI > Tc-99m-tetrofosmin in all cells) as compared to the uptake in control cells. With CCCP, decrease of Tc-99m-MIBI uptake in cells preincubated with nigericin was higher than that in cells under basal conditions, whereas a similar decrease of Tc-99m-tetrofosmin uptake in these two group of cells was found. Washout of Tc-99m-MIBI from all cells was lower than that of Tc-99m-tetrofosmin. No significant difference in cell-associated activity of both tracers was found between washout after 30 minutes and that after 60 minutes of incubation, in all cells. Washout of Tc-99m-MIBI from SK-BR-3 cells Tc-99m-tetrofosmin) and Na/K-ATPase pump (Tc-99m-tetrofosmin > Tc-99m-MIBI). Tc-99m-MIBI and

  7. Adsorption behavior of 99Tc in Ca-bentonite

    International Nuclear Information System (INIS)

    Liu Dejun; Fan Xianhua; Zhang Yingjie; Yao Jun; Zhou Duo; Wang Yong

    2004-01-01

    The adsorption behaviors of 99 Tc in bentonite were studied with batch methods under aerobic and anoxic conditions. The adsorption ratios is about 1.47 mL/g under aerobic conditions. The adsorption ratio of 99 Tc in bentonite is not affected by pH in the range of 5-12 and the CO 3 2- , Fe 3+ concentrations in the range of 10 -8 -10 -2 mol/L in the solution. The adsorption ratio of Tc in bentonite increases with the increase of the mass percent of Fe 2 O 3 and Fe 3 O 4 and the Fe 2+ concentration in the range of 10 -8 -10 -2 mol/L. Tc exists ainly in the form of Tc(VII) after the adsorption equilibriums. The adsorption ratio of Tc in bentonite increase with the increase of the mass percent of Fe and Tc exists mainly in the form of Tc(VII) after the adsorption equilibriums. The adsorption ratio of Tc in bentonite is about 84.84 mL/g under anoxic conditions. The adsorption ratios of 99 Tc in bentonite decreases with the increase of pH in the range of 5-12 and the CO 3 2- concentration in the range of 10 -8 -10 -2 mol/L in the solution. The adsorption ratio of Tc in bentonite increases with the increase of the Fe 3+ , Fe 2+ concentration in the range of 10 -8 -10 -2 mol/L and the mass percent of Fe, Fe 2 O 3 and Fe 3 O 4 . Tc exists mainly in the form of Tc(IV) after the adsorption equilibriums. The adsorption isotherms of TcO 4 - in bentonite are all in fairly agree with the Freundlich's equation under aerobic and anoxic conditions. (authors)

  8. Superplastic Deformation of TC6 Alloy

    Directory of Open Access Journals (Sweden)

    DING Ling

    2016-12-01

    Full Text Available The superplastic tensile tests of TC6 alloy were conducted in the temperature range of 800-900℃ by using the maximum m value superplasticity deformation (Max m SPD method and the constant strain rate deformation method at the strain rate range of 0.0001-0.1 s-1. The stress-strain curve of the tensile tests was obtained and the microstructure near the fracture were analyzed by metallographic microscope. The result shows that the superplasticity of TC6 alloy is excellent, and the elongation increases first and then decreases with the increase of strain rate or temperature. When the temperature is 850℃ and strain rate is 0.001 s-1 at constant stain rate tensile tests, the elongation reaches up to 993%. However, the elongation using Max m SPD method at 850℃ is 1353%. It is shown that the material can achieve better superplasticity by using Max m SPD tensile compared to constant stain rate tensile under the same temperature. The superplastic deformation of TC6 alloy can enhance the dynamic recrystallization behavior significantly, the dynamic recrystallization behavior is promoted when strain rate and temperature are increased.

  9. 99mTc-diethyl-IDA chloescintigraphy

    International Nuclear Information System (INIS)

    Kim, J. W.; Oh, K. C.; Bae, B. H.; Kim, Y. S.; Park, B. H.

    1981-01-01

    For many years, 131 I-rose bengal has been used as the main hepatobiliary radiopharmaceutical. The undesirable physical characteristics of the radioiodine, however, finally prevented its widespread use in clinical medicine. In recent years, a number of hepatobiliary radiopharmaceuticals employing 99m Tc and 123 I as indicator have been introduced. 99m Tc-diethyl-IDA is a most promising one in these agents. Cholescintigraphy, using 99m Tc-diethyl-IDA was performed in 10 normal subjects and 32 patients suffering from various hepatobiliary disturbances, from Sep. -'79 to Aug-' 80, at the department of radiology, Maryknoll Hospital. The following results are obtained: 1. In normal fasting subjects, the liver, GB, CBD, and the proximal portion of small bowel are clearly delineated within 30 min after the injection. After a fatty meal, the radioactivity of the liver and CBD is notably disappeared with increase of the activity in GB and small bowel. 2. A dilatation of the main biliary ducts is a pathognomomic sign of partial mechanical obstructive disorders and a key point of D.Dx from hepatocellular disorders. 3. In cases of complete biliary obstruction, the radioactivity of the liver, CBD, and small bowel is not separated and the background activity is markedly increased. The kidneys are well visualized. 4. In severe hyperbilirubinaemia of above 10mg%, this method is not valuable

  10. Mechanisms of conventional and high Tc superconductivity

    International Nuclear Information System (INIS)

    Kresin, V.L.; Morawitz, H.; Wolf, S.A.

    1993-01-01

    This book gives a careful and objective review of theories of superconductivity in traditional superconductors, organics, and high Tc cuprates. Of course, the authors do still present their own theories of cuprate superconductivity, but only in the final chapter after other possibilities have been discussed. The book should be especially useful for researchers entering the field of high Tc superconductivity. The reviews of photon mediated pairing and strong coupling theory are very welcome, since much of this material has not been reviewed since the classic 1969 volume edited by Parks. In particular the authors dispel the various myths that phonon mediated pairing leads to upper bounds on Tc. In addition to phonon mediated pairing the book discussed in detail pairing due to exchange of acoustic (demon) plasmons, excitons, or magnetic fluctuations. There have been so many diverse mechanisms based on strong correlation and large U Hubbard models that a book like this can only discuss a limited selection of the main contenders. In particular here the emphasis on Fermi liquid based models no doubt reflects the authors' own point of view. A whole chapter discusses the concepts of induced superconductivity, in the proximity effect, and its application to materials with several different electronic subsystems

  11. Pretreatment of Tc-Containing Waste and Its Effect on Tc-99 Leaching From Grouts

    International Nuclear Information System (INIS)

    Aloy, Albert; Kovarskaya, Elena N.; Harbour, John R.; Langton, Christine A.; Holtzscheiter, E. William

    2007-01-01

    A salt solution (doped with Tc-99), that simulates the salt waste stream to be processed at the Saltstone Production Facility, was immobilized in grout waste forms with and without (1) ground granulated blast furnace slag and (2) pretreatment with iron salts. The degree of immobilization of Tc-99 was measured through monolithic and crushed grout leaching tests. Although Fe (+2) was shown to be effective in reducing Tc-99 to the +4 state, the strong reducing nature of the blast furnace slag present in the grout formulation dominated the reduction of Tc-99 in the cured grouts. An effective diffusion coefficient of 4.75 x 10 -12 (Leach Index of 11.4) was measured using the ANSI/ANS-16.1 protocol. The leaching results show that, even in the presence of a concentrated salt solution, blast furnace slag can effectively reduce pertechnetate to the immobile +4 oxidation state. The measured diffusivity was introduced into a flow and transport model (PORFLOW) to calculate the release of Tc-99 from a Saltstone Vault as a function of hydraulic conductivity of the matrix. (authors)

  12. Tumor affinity of technetium-99m labeled radiopharmaceuticals. II. Sup(99m)Tc-Sn-diphosphonate (sup(99m)Tc-EHDP), sup(99m)Tc-Sn-dimercaptosuccinic acid (sup(99m)Tc-DMSA), sup(99m)Tc-Sn-diethyl stilbestrol diphosphate (sup(99m)Tc-DSDP)

    Energy Technology Data Exchange (ETDEWEB)

    Itoh, K; Kobayashi, S; Hisada, K; Tonami, N [Kanazawa Univ. (Japan). School of Medicine; Ando, A

    1976-10-01

    The authors have examined the tumor affinity of various sup(99m)Tc-labelled radiopharmaceuticals to Ehrlich's tumor for the purpose of delineating human malignant neoplasm positively. The biologic distributions of sup(99m)Tc-Sn-diphosphonate (sup(99m)Tc-EHDP), sup(99m)Tc-Sn-dimercaptosuccinic acid (sup(99m)Tc-DMSA) and sup(99m)Tc-Sn-diethyl stilbestrol diphosphate (sup(99m)Tc-DSDP, sup(99m)Tc-Honvan) are included as the second report on the tumor affinity of Ehrlich-bearing mice. Tumor concentration of sup(99m)Tc-EHDP was lowest and the positive delineation of implanted tumor with sup(99m)Tc-EHDP was poorest in sequential images, though active accumulation in some soft tissues malignant neoplasms, breast cancer, and thyroid cancer, has been reported. Tumor concentration and the tumor-to-blood ratio of sup(99m)Tc-DMSA were not so high, contrary to our expectation that /sup 197/Hg-DMSA might show high tumor concentration and high tumor-to-blood ratio the same as /sup 197/Hg chlormerodrin of the renal scanning radiopharmaceuticals. Tumor concentration of sup(99m)Tc-DSDP was highest. The tumor-to-blood concentration ratio was lower than that of the above mentioned radiopharmaceuticals but the tumor-to-liver ratio and/or tumor-to-lung ratio was over 1.0 at the earlier time. Biologic distribution of sup(99m)Tc-DSDP was similar to that of /sup 32/P labeled DSDP. It is presumed that sup(99m)Tc is labeled at the phosphate ester of DSDP which is dephospholytated immediately by phospholylase in vivo following intravenous injection. Although it is not known precisely it may be assumed that the mechanism of accumulating sup(99m)Tc-DSDP in Ehrlich's tumor is related to the phospholylase activity in neoplasms.

  13. Biogeochemical Coupling of Fe and Tc Speciation in Subsurface Sediments: Implications to Long-Term Tc Immobilization

    International Nuclear Information System (INIS)

    Jim K. Fredrickson; C. I. Steefel; R. K. Kukkadapu; S. M. Heald

    2006-01-01

    The project has been focused on biochemical processes in subsurface sediments involving Fe that control the valence state, solubility, and effective mobility of 99Tc. Our goal has been to understand the Tc biogeochemistry as it may occur in suboxic and biostimulated subsurface environments. Two objectives have been pursued: (1) To determine the relative reaction rates of 99Tc(VII)O2(aq) with metal reducing bacteria and biogenic Fe(II); and to characterize the identity, structure, and molecular speciation of Tc(IV) products formed through reaction with both biotic and abiotic reductants. (2) To quantify the biogeochemical factors controlling the reaction rate of O2 with Tc(IV)O2?nH2O in sediment resulting from the direct enzymatic reduction of Tc(VII) by DIRB and/or the reaction of Tc(VII) with the various types of biogenic Fe(II) produced by DIRB

  14. Comparison of sup(99m)Tc-MDP to sup(99m)Tc-pertechnetate by computerized quantitative joint scintigraphy

    International Nuclear Information System (INIS)

    Rekonen, A.; Moettoenen, T.; Oka, M.

    1982-01-01

    99mTc-pertechnetate was compared to 99mTc-MDP in joint pairs with asymmetric arthritis. Markedly elevated joint activity ratios (inflamed/uninflamed joint) were measured in all the joint pairs studied. In the joints affected by reactive arthritis and without roentgenologic changes the mean joint activity was the same with both tracers. A very high activity ratio with 99mTc-MDP was found in septic arthritis. In rheumatoid arthritis the sensitivity of 99mTc-MDP as an indicator of active arthritis seemed to be better than that of 99mTc-pertechnetate. Even in joints without erosions in roentgenograms the joint activity ratios were markedly elevated with 99mTc-MDP. This suggests, that high activity in 99mTc-MDP scanning might be prognostic of erosive joint changes. In this work a profile curve was used for quantitation differences between joints

  15. Clinical evaluation of Tc-99m-mebrofenin and comparison with Tc-disofenin for radionuclide hepatobiliary imaging

    International Nuclear Information System (INIS)

    Klingensmith, W. III; Fritzberg, A.; Spitzer, V.

    1982-01-01

    The clinical comparison reported indicates that Tc-mebrofenin has a significantly lower level of renal excretion that Tc-disofenin at all bilirubin levels. At a total bilirubin level of 25 mg/dl the renal excretion of Tc-mebrofenin is still less than the renal excretion of Tc-disofenin in subjects with normal bilirubin levels. In addition, renal radioactivity in images was never seen in subjects with normal bilirubins while visualization of renal radioactivity is routine in normal subjects with Tc-disofenin. No significant differences were found in any other parameter including hepatocyte extraction efficiency, time of maximum hepatic radioactivity, and hepatic parenchymal washout. This study indicates that Tc-mebrofenin is equal to Tc-disofenin in its hepatobiliary characteristics and superior in its renal characteristics

  16. The new 99mTc myocardial perfusion imaging agents: 99mTc-sestamibi and 99mTc-teboroxime

    International Nuclear Information System (INIS)

    Berman, D.S.; Kiat, H.; Maddahi, J.

    1991-01-01

    The two new 99m (99mTc) labeled myocardial perfusion agents, 99mTc-Sestamibi and 99mTc-Teboroxime, are now available for routine clinical application. Both agents allow assessment of ejection fraction by the first-pass technique at rest or during exercise, thus providing additional information not available with thallium-201. 99mTc-Sestamibi has long myocardial residence time, as well as adequate myocardial extraction, providing images of higher count density and superior quality compared with thallium-201. 99mTc-Teboroxime has excellent myocardial uptake characteristics but is cleared very rapidly from the myocardium. Both tracers have shown results similar to those obtained with thallium-201 for detection of coronary artery disease and the assessment of defect reversibility. 99mTc-Sestamibi studies using the rest/stress imaging sequence can be accomplished in approximately 5 hours; studies using dual-isotope imaging (rest thallium-201 and stress 99mTc-Sestamibi injection) can be completed in 1 to 2 hours. Gated stress images can be performed with 99mTc-Sestamibi, providing simultaneous information of myocardial perfusion at stress and resting wall motion or thickening and allowing rapid differentiation of ischemic from infarcted tissue. Because of its slow myocardial clearance and absence of redistribution, 99mTc-Sestamibi allows uncoupling of the time of injection from the time of imaging and thus can be valuable in the evaluation of acute myocardial infarction and outcome of thrombolytic therapy. With 99mTc-Teboroxime, rapid serial studies are feasible. Pharmacologic stress and rest studies with 99mTc-Teboroxime single photon emission computed tomography potentially can be completed in under 30 minutes. 73 references

  17. Mediastinoscopia contra tomografía axial computadorizada en la estadificación del carcinoma pulmonar de células no pequeñas

    Directory of Open Access Journals (Sweden)

    Edelberto Fuentes Valdés

    2002-08-01

    Full Text Available La mediastinoscopia constituye un medio diagnóstico útil en la estadificación del cáncer del pulmón, y es también utilizada para este fin la tomografía axial computadorizada (TAC, por lo que fue el propósito de este trabajo realizar un estudio que permitiera conocer la eficacia diagnóstica de ambas y compararlas entre sí. Se estudiaron 51 pacientes con diagnóstico de cáncer de pulmón de células no pequeñas. A todos se les realizó TAC y mediastinoscopia, como parte del estudio preoperatorio. La eficacia diagnóstica se determinó analizando la sensibilidad, la especificidad y los valores predictivos positivo y negativo de ambas técnicas. Para la mediastinoscopia la sensibilidad fue de 68,4 %, la especificidad y el valor predictivo positivo dieron valores de 100 % y el valor predictivo negativo de 84,6 %, con una certeza diagnóstica de 88,5 %. Los resultados para la TAC mostraron valores significativamente inferiores para los mismos parámetros: sensibilidad y valor predictivo positivo de 27,7 % y especificidad y valor predictivo negativo de 60,6 %, con una certeza diagnóstica de 49,0 %. En conclusión la mediastinoscopia resultó superior a la TAC en la detección de la enfermedad metastásica mediastinal cuando estuvo presente, lo que expresa su sensibilidad, además de que es capaz de predecir con mayor exactitud cuando el enfermo en realidad no tiene la toma linfática mediastinalAs mediastinoscopy is a useful diagnostic tool in lung cancer staging and computed axial tomography (CAT is also used to this end, a study was conducted to know the diagnostic efficiency of both and to compare them. 51 patients with diagnosis of non-small cell lung cancer were studied. All of them underwent CAT and mediastinoscopy as part of the preoperative study. The diagnostic efficiency was determined by analyzing sensitivity and specificity and the positive and negative predictive values of both techniques. In the mediastinoscopy, sensitivity

  18. Hemorragia subaracnoídea com tomografia de crânio sem sinais de sangramento Subarachnoidal hemorrhage with cranial tomography without bleeding signals

    Directory of Open Access Journals (Sweden)

    Silvio Francisco

    1997-09-01

    Full Text Available Foram observados 23 casos de pacientes com suspeita clínica de hemorragia subaracnoídea (HSA, com tomografia de crânio (CT sem sinais de sangramento, com diagnóstico definitivo realizado por exame de líquido cefalorraquiano(LCR. Desses, 20 casos foram submetidos a angiografia cerebral. Estabeleceu-se a classificação clínica de Hunt & Hess. Os principais achados neste estudo foram:1 um terço dos pacientes apresentou intervalo de tempo entre o ictus e a realização da CT e do LCR entre 24 e 48 horas, período de maior sensiblidade da CT; 2 dos pacientes estudados com angiografia cerebral, 55% tiveram o diagnóstico de aneurisma com predomínio no território de carótida e cerebral anterior; 3 o grau clínico dominante foi Hunt & Hess I e II. Todos os achados encontrados demonstraram a necessidade da realização de LCR em suspeita de HSA sem sinais de sangramento na CT.We observed 23 pacients with clinical hypothesis of subarachnoidal hemorrhage (SAH having cranial tomography (CT without bleeding signals. The final diagnosis of SAH was made upon the cerebrospinal fluid (CSF results. Twenty cases were submitted to brain angiography. They were focused under the clinical classification of Hunt & Hess. The main results were: 1 1/3 of patients had interval time between 24 and 48 hours after ictus and before CT and CSF making; this was the most sensitive CT time; 2 55% of patients with brain angiography had aneurysm predominantly in the carotid and anterior cerebral artery territory; 3 the dominant clinical degree was Hunt & Hess I e II. Conclusion: the results demonstrate the need of CSF test in case of SAH clinical diagnosis with CT showing no bleeding signals.

  19. Internal friction around Tc connected with superconductivity in high Tc superconductors

    International Nuclear Information System (INIS)

    Wang Yening

    1993-01-01

    Internal friction and ultrasonic measurements show that there always exists a phase-like transition (PLT) characterized by the jump of lattice parameters at tens degrees above Tc in superconducting YBaCuO, BiSrCaCuO and TlBaCaCuO. Ferroelastic loops and shape memory effect associated with elastic softening invariably occur at the PLT temperature, showing the characteristics of thermoelastic martensitic transition. Internal frictions in KHz of Bi(Pb)SrCaCuO reveal a static hysteretic plateau (Qp -1 ) above Tc that drops linearly with temperature below Tc. The Qp -1 of YBaCuO decreases with decreasing oxygen content. The origin of the hysteretic Qp -1 is attributed to the lattice distortions around the carriers. (orig.)

  20. Bioavailability of {sup 99m}Tc-paclitaxel-glucuronide ({sup 99m}Tc-PAC-G)

    Energy Technology Data Exchange (ETDEWEB)

    Biber Muftuler, F.Z.; Demir, I.; Uenack, P.; Ichedef, C.; Yurt Kilcar, A. [Ege Univ., Izmir (Turkey). Dept. of Nuclear Applications

    2011-07-01

    An antitumor agent paclitaxel (PAC) has been proved to be efficient in the treatment of breast and ovarian cancer. Glucuronic acid-derived paclitaxel compound (paclitaxel-glucuronide (PAC-G)) was enzymatically synthesized using microsome preparate separated from rat livers. The biodistribution mechanism of PAC-G in healthy female Albino Wistar rats has been investigated. The expected structure is confirmed according to LC/MS results, and the possible attachment is to C2-hydroxyl group. PAC-G was labeled with {sup 99m}Tc and the radiochemical yield of radiolabeled compound ({sup 99m}Tc-PAC-G) was 98.0 {+-} 02.74% (n=9). The range of the breast/blood and breast/muscle ratios is approximately between 3 and 35 in 240 min. All these experimental studies indicate that {sup 99m}Tc-PAC-G may potentially be used in breast tissue as an imaging agent. (orig.)

  1. The formation of insoluble Tc depends on bacterial activity

    International Nuclear Information System (INIS)

    Ishii, Nobuyoshi; Uchida, Shigeo; Koiso, Hiroyuki

    2005-01-01

    The formation of insoluble Tc (>0.2 μm in size) in ponding water of paddy soil was investigated. The ponding water prepared by flooding with deionized water was collected at a one-week intervals during the 120 days of the experimental period. The collected sample was incubated with 3 kBq mL -1 TcO 4 - at 25degC for 14 days. The mean value of relative amounts of insolubilized Tc was less than 0.6% of total Tc. This result suggested that flooding with deionized water was not effective for the formation of insoluble Tc. When the ponding water sample was incubated with TcO 4 - under anaerobic conditions, Tc was scarcely insolubilized. On the other hand, a significant fraction of the Tc was insolubilized in the ponding water sample supplemented with nutrients that promote bacterial activity. Also, the amount of insoluble Tc increased with time. From these results, it was concluded that the formation of insoluble Tc in the ponding water depends on enhanced bacterial activity rather than just anaerobic conditions. (author)

  2. Exafs studies of coprecipitation and adsorption reactions of Tc

    Energy Technology Data Exchange (ETDEWEB)

    Bunker, D.J.; Jones, M.J.; Livens, F.R.; Collison, D. [Manchester Univ. (United Kingdom). Dept. of Chemistry; Pattrick, R.A.D. [Manchester Univ., Dept. of Earth Sciences (United Kingdom); Charnock, J.M. [CLRC Daresbury Laboratoire, Warrington Cheshire (United Kingdom)

    2000-07-01

    Adsorption and coprecipitation reactions may be a simple way of removing [TcO{sub 4}]{sup -} from aqueous solution. The effectiveness of a range of potential adsorbents and precipitants has been evaluated and some are capable of near quantitative (>98%) removal of [TcO{sub 4}){sup -} from solution. X-ray absorption near edge structure (XANES) has been used to determine Tc oxidation states and extended X-ray absorption fine structure spectroscopy (EXAFS) has been used to identify the local environment of Tc. The absorption edge position has been determined, using [PPh{sub 4}][TcO{sub 4}], TcS{sub 2} and Tc{sub 2}S{sub 7} as model compounds, and is diagnostic of Tc oxidation state. In a series of experiments investigating FeS coprecipitation, Tc was reduced to oxidation state (IV) and its local environment resembled that in TcO{sub 2} (6 O atoms at approximately 2.0 Angstrom). (authors)

  3. Studies of the Tc oxidation states in humic acid solutions

    International Nuclear Information System (INIS)

    Wang Bo; Liu Dejun; Yao Jun

    2010-01-01

    The oxidation state is an important aspect of the speciation of Tc in groundwater that contained organic substances due to it control the precipitation, complexation, sorption and colloid formation behavior of the Tc under HWL geological disposal conditions. In present work, the oxidation states of Tc were investigated using the LaCl 3 coagulation method and solution extraction method in aqueous solutions in which the humic acid concentration range is from 0 to 20 mg L -1 and the Tc (Ⅶ) concentration range is about 10 -8 mol l -1 . The radiocounting of 99 Tc was determined using liquid scintillation spectrometry. The humic acid will influence the radiocounting ratio of 99 Tc apparently, however, the quenching effect can be restrained once keep the volume of the cocktail to about twenty times of the sample volume. The LaCl 3 coagulation methods were carried out for the investigation of Tc oxidation states in humic acid aqueous systems at about pH 8. The tetraphenylarsonium chloride (IPA)-chloroform extraction method was used also simultaneously to investigation the concentrations of Tc (Ⅳ) and Tc (Ⅶ) for the availability of the LaCl 3 precipitation method, and the experimental results demonstrate that tetravalent technetium and pertechnetate concentrations are well agreement with the LaCl 3 precipitation method. These two experimental results demonstrated that Tc (Ⅶ) is very stable in the Tc (Ⅶ)-humic acid system during a 350 days experimental period, and the Tc (Ⅳ) concentrations are very lower, that is indicate that there didn't oxidizing reactions between the Fluka humic acid and Tc (Ⅶ) in aqueous solutions under anaerobic conditions. That is means the presence of humic acids even in anaerobic groundwater is disadvantage for the retardance of radionuclides. (authors)

  4. Studies of Tc oxidation states in humic acid solutions

    International Nuclear Information System (INIS)

    Wang Bo; Liu Dejun; Yao Jun

    2011-01-01

    The oxidation state of Tc is an important aspect of the speciation in groundwater which contained organic substances due to it control the precipitation, complexation, sorption and colloid formation behavior of the Tc under HWL geological disposal conditions. In present work, the oxidation states of Tc were investigated using the LaCl 3 coagulation method and solution extraction method in aqueous solutions in which the humic acid concentration range is from 0 to 20 mg/L and the Tc (VII) concentration is about 10 -8 mol/L. The radiocounting of 99 Tc was determined using liquid scintillation spectrometry. The humic acid will influence the radiocounting ratio of 99 Tc apparently, however, the quenching effect can be restrained once keep the volume of the cocktail to about twenty times of the sample volume. The LaCl 3 coagulation method was carried out for the investigation of Tc oxidation states in humic acid aqueous systems at about pH 8. The tetraphenylarsonium chloride (TPA)-chloroform extraction method was used also simultaneously to investigation the concentrations of Tc (IV) and Tc (VII) for the availability of the LaCl 3 precipitation method, and the experimental results demonstrate that tetravalent technetium and pertechnetate concentration are well agreement with the LaCl 3 precipitation method. These two experimental results demonstrated that Tc (VII) is very stable in the Tc (VII)-humic acid system during a 350 days experimental period, and the Tc (IV) concentrations are very lower, that is indicate that there didn't oxidizing reactions between the Fluka humic acid and Tc (VII) in aqueous solutions under anaerobic conditions. That means the presence of humic acids even in anaerobic groundwater is disadvantage for the retardance of radionuclides. (authors)

  5. Identification of novel mammalian hosts and Brazilian biome geographic distribution of Trypanosoma cruzi TcIII and TcIV.

    Science.gov (United States)

    Barros, Juliana Helena S; Xavier, Samanta Cristina C; Bilac, Daniele; Lima, Valdirene Santos; Dario, Maria Augusta; Jansen, Ana Maria

    2017-08-01

    Trypanosoma cruzi is a parasitic protozoan responsible for Chagas disease. Seven different Discrete Typing Units (DTUs) of T. cruzi are currently identified in nature: TcI-TcVI, and TcBat whose distribution patterns in nature, hosts/reservoirs and eco-epidemiological importance are still little known. Here, we present novel data on the geographic distribution and diversity of mammalian hosts and vectors of T. cruzi DTUs TcIII and TcIV. In this study, we analyzed 61 T. cruzi isolates obtained from 18 species of mammals (five orders) and two Hemiptera genera. Samples were collected from five Brazilian biomes (Pantanal, Caatinga, Cerrado, Atlantic Rainforest, and Amazon) previously characterized as Z3 or mixed infection (TcI-Z3) by mini-exon gene PCR. To identify TcIII and TcIV genotypes, we applied restriction fragment length polymorphism analysis to the PCR-amplified histone 3 gene. DTUs TcIII and TcIV were identified in single and mixed infections from wide dispersion throughout five Brazilian biomes studied, with TcIV being the most common. Pantanal was the biome that displayed the largest number of samples characterized as TcIII and TcIV in single and mixed infections, followed by Atlantic Rainforest and Amazon. Species from the Didelphimorphia order displayed the highest frequency of infection and were found in all five biomes. We report, for the first time, the infection of a species of the Artiodactyla order by DTU TcIII. In addition, we describe new host species: five mammals (marsupials and rodents) and two genera of Hemiptera. Our data indicate that DTUs TcIII and TcIV are more widespread and infect a larger number of mammalian species than previously thought. In addition, they are transmitted in restricted foci and cycles, but in different microhabitats and areas with distinct ecological profiles. Finally, we show that DTUs TcIII and TcIV do not present any specific association with biomes or host species. Copyright © 2017. Published by Elsevier B.V.

  6. Accumulation of 99Tc in duckweed Lemna minor L. as a function of growth rate and 99Tc concentration

    International Nuclear Information System (INIS)

    Hattink, J.; Wolterbeek, H.Th.

    2001-01-01

    This study focuses on the question of whether short-term studies can be used to forecast the accumulation of the long-lived fission product 99 Tc in duckweed, Lemna minor L., grown in the field; in other words, are the accumulation parameters independent of changing growth rates typical of natural populations of duckweed. Two processes determine the 99 Tc accumulation: (i) uptake and release of 99 TcO 4 - , characterised by a concentration factor, K d , and (ii) first-order reduction and complexation of Tc VII , characterised by k red . At various 99 Tc concentrations, the growth, total Tc and TcO 4 - accumulation were monitored over 10 days; parameters were fitted and compared with earlier results. Both K d and k red turn out to be independent of time, concentration and growth rate up to a concentration of 10 -6 mol l -1 99 TcO 4 - . Concentrations above this level result in toxic effects. The Tc accumulation in field populations of duckweed at Tc concentrations which generally occur in the environment can be forecasted by using the results from short-term experiments

  7. 99mTc-Tetrofosmin scintimammography in suspected breast cancer patients: comparison with 99mTc-MIBI

    International Nuclear Information System (INIS)

    Kim, Seong Jang; Kim, In Ju; Kim, Yong Ki; Bae, Young Tae

    2000-01-01

    The aim of this study was to investigate the diagnostic role of 99m Tc-Tetrofosmin in detection of breast cancer and compared with that of 99m Tc-MIBI. Forty-eight patients with a clinically palpable mass or abnormal mammographic or ultrasonographic findings had 99m Tc-MIBI and 99m Tc-Tetrofosmin scintimammographies after intravenous injection of 925 MBq of radiopharmaceuticals. The scintimammographs were correlated with histopathologic findings. Thirty-three patients were diagnosed with breast cancer and 15 patients with benign breast diseases. The numbers of true positive, true negative, false positive, and false negative cases of 99m Tc-MIBI scintimammography were 29, 10, 5, and 4 respectively. The sensitivity, specificity, positive predictive value, and negative predictive value of 99m Tc-MIBI scintimammographies were 87.8%, 66.7%, 85.3%, and 71.4% respectively. The numbers of true positive, true negative, false positive, and false negative cases of 99m Tc-Tetrofosmin were 31, 10, 5, and 2 respectively. The sensitivity, specificity, positive predictive value, negative predictive value of 99m Tc-Tetrofosmin were 93.9%, 66.7%, 86.1%, and 73.3% respectively. One patient was false negative in both 99m Tc-Tetrofosmin scintimammographies and its size was 0.5cm. 99m Tc-Tetrofosmin and 99m Tc-MIBI were non-invasive and useful in detection of breast cancer and 99m Tc-Tetrofosmin was comparable to the 99m Tc-MIBI in detection of primary breast cancer.=20

  8. Efeitos da anemia materna na cardiotocografia computadorizada e perfil biofísico fetal Effects of maternal anemia on computerized cardiotocography and fetal biophysical profile

    Directory of Open Access Journals (Sweden)

    Roseli Mieko Yamamoto Nomura

    2009-12-01

    Full Text Available OBJETIVOS: avaliar a influência dos níveis de hemoglobina (Hb materna nos padrões da frequência cardíaca fetal (FCF e no perfil biofísico fetal (PBF em gestações a termo. MÉTODOS: gestantes portadoras de anemia (Hb11,0 g/dL. Foram excluídos casos com anomalias ou restrição do crescimento fetal. A avaliação da FCF foi realizada pela cardiotocografia computadorizada (Sistema8002-Sonicaid e análise do traçado com 30 minutos de exame. O PBF foi realizado em todas as pacientes. Foram utilizados os testes t de Student, teste do χ2 e teste exato de Fisher. O nível de significância utilizado foi de 0,05. RESULTADOS: A média da Hb materna no grupo com anemia (n=18 foi de 9,4 g/dL (DP=1,4 g/dL e no Grupo Controle 12,4 g/dL (DP=1,3 g/dL. Quanto aos parâmetros da cardiotocografia, não foi constatada diferença significativa nas médias entre os grupos com anemia e controle, respectivamente: FCF basal (131,3 bpm versus 133,7 bpm, p=0,5, acelerações da FCF > 10 bpm (7,9 versus. 8,2, p=0,866, acelerações da FCF > 15 bpm (5,2 versus 5,4, p=0,9, episódios de alta variação da FCF (17,1 versus 15,5 min, p=0,5, episódios de baixa variação da FCF (4,4 versus 3,6 min, p=0,6, e variação de curto prazo (10,5 versus 10,9 ms, p=0,5. Em ambos os grupos, todas as pacientes apresentaram PBF normal. CONCLUSÕES: este estudo sugere que a anemia materna leve ou moderada, sem outras comorbidades maternas ou fetais, não se associa a anormalidades nos parâmetros do perfil biofísico fetal e da FCF analisada pela cardiotocografia computadorizada.PURPOSES: to evaluate the influence of maternal hemoglobin (Hb levels in the patterns of fetal heart rate (FHR and in the fetal biophysical profile (FBP in term gestations. METHODS: pregnant women with anemia (Hb11,0 g/dL. Cases of anomalies or fetal growing restrictions were excluded. The FHR evaluation was performed by computerized cardiotocography (8002 System-Sonicaid, and by record analysis during

  9. Formation of a Tc(III)-adenosine diphosphate complex

    International Nuclear Information System (INIS)

    Torres, J.; Kremer, C.; Kremer, E.

    1995-01-01

    A 99 Tc-ADP complex was prepared when KTcO 4 was reduced in aqueous medium by SnCl 2 , Na 2 S 2 O 4 , NaBH 4 or Zn in the presence of ADP in excess. The resulting solution was studied by chromatography and spectrophotometry. Electrochemical reduction and substitution on [Tc III (tu) 6 ] 3+ were investigated as alternative synthetic routes. The anionic Tc-ADP complex was isolated as a solid. Cerimetric titrations confirmed the oxidation state +3 for the central atom. IR and 1 H-NMR data showed that the purine base is bonded to the Tc central atom but not the ribose moiety. No oxo groups seemed to be directly bonded to the Tc atom. The complex is rather stable in neutral solutions. However, it decomposes to pertechnetate and TcO 2 at extreme pH values. (author). 16 refs., 2 figs., 3 tabs

  10. A review of sup(99m)Tc generator technology

    International Nuclear Information System (INIS)

    Molinski, V.J.

    1982-01-01

    The sup(99m)Tc generator has found widespread use because it is ideally suited for scintigraphy. The preparation of sup(99m)Tc generators using alumina and other ion exchange systems is described. Other methods of separating 99 Mo and sup(99m)Tc, such as solvent extraction and sublimation, are also discussed. Some of the problems associated with the alumina column type sup(99m)Tc generator are listed with possible causes and solutions to their problems. The current biomedical applications of the sup(99m)Tc radioisotope are the basis of a $100 million nuclear medicine business. The importance of the sup(99m)Tc generator makes it imperative that we understand and solve the problems associated with its manufacture. (author)

  11. Can tumor uptake Tc-99m MDP ?

    International Nuclear Information System (INIS)

    Yand Shun, Fang; Yao, Ming; Zeng, Jun; Shi Zhen, Yu; Zhao Lan, Xiang; Dong Qiang, Gang

    2003-01-01

    To explore the mechanism of technetium-99m-methylene diphosphonate (MDP) uptake within tumor through analyze a distribution of Tc-99m MDP in mice bearing tumor cell lines. Methods: The uptake of Tc-99m MDP was analyzed in seven human tumor cell lines ( SPC-A1 adenocarcinoma of lung cancer, Bcap-37 Breast cancer, T-24 Bladder cancer, SKOV3 Ovary carcinoma, Hela-229 Cervical carcinoma, SCI-OS Osteosarcoma, SCI-375 Melanoma) and mouse Lewis lung cancer cell line. They were transplanted into athymic mice, SCID nude mice and C57BL/6 mice, respectively. Approximately 10(6) cells of each cell line were injected subcutaneously into a right chest of mouse. After 4 and 5 weeks, the Tc-99m MDP scintigraphy were determined 6 hours after tail vein injection of 74MBq in 0.05ml every mouse. Result: Biodistribution and tumor uptake MDP was different in the various cell types investigated. According to the Region Ratio program of Siemens Power Macintosh 9500 Computer System, region of interests (RIOs) placed on a small part of the tumor and horizontal copied to left background (T/B) and thoracic spine (T/N) of mice in Tc-99m MDP imaging. The average cpm/pixel ratios were calculated by standardized uptake measure (SUM) and determined the tumor-positive value (T/B) greater than or equal to 1.2. T/B of cell lines were sorted from higher to lower as follows: SCI-OS, Lewis, SKOV3, SCI-375, T-24, SPC-A1, Bcap-37, Hela-229. T/N: SCI-OS, SKOV3, T-24, SCI-375, Lewis, SPC-A1, Bcap-37, Hela-229. The biodistribution data of 99Tcm-MDP in SPC-A1 tumor-bearing BALB/c nude mice were given as ID/g and represent the means D (n=13) in 30 hours after injection of Tc-99m MDP. ID/g of major tissue were sorted from higher to lower as follows: thoracic spine, lumbar, ribs, kidneys, the center of tumor, the ulcer of tumor, the surrounding of tumor, lymph node, blood, lungs, heart, liver. Conclusions: Most of tumor can uptake Tc-99m MDP including human adenocarcinoma. The uptake rate in the center tissue of

  12. 99mTc renal tubular function agents: Current status

    International Nuclear Information System (INIS)

    Eshima, D.; Fritzberg, A.R.; Taylor, A. Jr.

    1990-01-01

    Orthoiodohippuric (OIH) acid labeled with 131I is a widely used renal radiopharmaceutical agent and has been the standard radiopharmaceutical agent for the measurement of effective renal plasma flow (EPRF). Limitations to the routine clinical use of 131I OIH are related to the suboptimal imaging properties of the 131I radionuclide and its relatively high radiation dose. 123I has been substituted for 131I; however, its high cost and short shelf-life have limited its widespread use. Recent work has centered on the development of a new 99mTc renal tubular function agent, which would use the optimal radionuclidic properties and availability of 99mTc and combine the clinical information provided by OIH. The search for a suitable 99mTc renal tubular function agent has focused on the diamide dithiolate (N2S2), the paraaminohippuric iminodiacetic acid (PAHIDA), and the triamide mercaptide (N3S) donor ligand systems. To date, the most promising 99mTc tubular function agent is the N3S complex: 99mTc mercaptoacetyltriglycine (99mTc MAG3). Studies in animal models in diuresis, dehydration, acid or base imbalance, ischemia, and renal artery stenosis demonstrate that 99mTc MAG3 behaves similarly to 131I OIH. A simple kit formulation is available that yields the 99mTc MAG3 complex in high radiochemical purity. Studies in normal subjects and patients indicate that 99mTc MAG3 is an excellent 99mTc renal tubular agent, but its plasma clearance is only 50% to 60% that of OIH. In an effort to develop an improved 99mTc renal tubular function agent, changes have been made in the core N3S donor ligand system, but to date no agent has been synthesized that is clinically superior to 99mTc MAG3. 61 references

  13. Quality assurance of Mo-99/Tc-99m radionuclide generators

    Science.gov (United States)

    Uzunov, Nikolay; Yordanova, Galina; Salim, Seniha; Stancheva, Natalya; Mineva, Vanya; Meléndez-Alafort, Laura; Rosato, Antonio

    2018-03-01

    Gamma-ray spectrometry analyses of the radionuclide content of eluate from two Mo-99/Tc-99m radionuclide generators POLTECHNET have been performed. The relative activities of 99Mo 103Ru and 131I radioisotopes with respect to the activity of 99mTc at different time intervals after the primary pertechnetate elution of the generators have been analyzed. The relative activities of the isotopes were determined and compared to the radionuclidic purity requirements for 99mTc.

  14. To the radiotoxicity of {sup 99m}Tc radiopharmaceuticals

    Energy Technology Data Exchange (ETDEWEB)

    Ftacnikova, S [Inst. of Preventive and Clinical Medicine, 83301 Bratislava (Slovakia)

    1996-12-31

    In this paper the radiotoxicity and RBE values of Auger electrons for {sup 99m}Tc radiopharmaceuticals were discussed. Expression for the expected RBE for {sup 99m}Tc compounds is given. For the Auger electrons emitted in the decay of {sup 99m}Tc the RBE(Auger) = 10 and a value of 20 for the radiation weighing factor were recommended. (J.K.) 4 refs.

  15. Preoperative localization of parathyroid carcinoma using Tc-99m MIBI.

    Science.gov (United States)

    Kitapçi, M T; Tastekin, G; Turgut, M; Caner, B; Kars, A; Barista, I; Bekdik, C

    1993-03-01

    A patient with parathyroid cancer is presented who underwent Tc-99m MIBI scintigraphy. The Tc-99m MIBI image demonstrated increased accumulation of activity at the lower pole of the left thyroid lobe which was later confirmed as a parathyroid cancer. Uptake by parathyroid cancer must be kept in mind as a cause of increased Tc-99m MIBI accumulation when a disease is in question in the thyroid or parathyroid gland.

  16. Jointscintigraphy with 99m Tc-pyrophosphate

    International Nuclear Information System (INIS)

    Mirtl, B.; Leb, G.; Klein, G.; Goebel, R.; Eber, O.

    1975-01-01

    Joint scintigraphy was performed in 85 patients suffering from a variety of rheumatic diseases, using a gamma camera and line scanner. Tc-pyrophosphate was the radio nuclide employed; it accumulates selectively in the juxta-articular parts of the bone. The method provides an objective demonstration of inflammatory and degenerative rheumatic joint changes. More over scintigraphic changes can be demonstrated in joint disease which is too early to be clinically apparent or before there are any corresponding changes in serological parameters. The method is useful both in the localisation and staging of disease, in the evaluation of treatment and as an objective control of clinical skills. (orig.) [de

  17. Pressure and high-Tc superconductivity in sulfur hydrides.

    Science.gov (United States)

    Gor'kov, Lev P; Kresin, Vladimir Z

    2016-05-11

    The paper discusses fundamentals of record-TC superconductivity discovered under high pressure in sulfur hydride. The rapid increase of TC with pressure in the vicinity of Pcr ≈ 123GPa is interpreted as the fingerprint of a first-order structural transition. Based on the cubic symmetry of the high-TC phase, it is argued that the lower-TC phase has a different periodicity, possibly related to an instability with a commensurate structural vector. In addition to the acoustic branches, the phonon spectrum of H3S contains hydrogen modes with much higher frequencies. Because of the complex spectrum, usual methods of calculating TC are here inapplicable. A modified approach is formulated and shown to provide realistic values for TC and to determine the relative contributions of optical and acoustic branches. The isotope effect (change of TC upon Deuterium for Hydrogen substitution) originates from high frequency phonons and differs in the two phases. The decrease of TC following its maximum in the high-TC phase is a sign of intermixing with pairing at hole-like pockets which arise in the energy spectrum of the cubic phase at the structural transition. On-pockets pairing leads to the appearance of a second gap and is remarkable for its non-adiabatic regime: hydrogen mode frequencies are comparable to the Fermi energy.

  18. Achalasia diagnosed by 99mTc pertechnetate scintigraphy

    International Nuclear Information System (INIS)

    Mikosch, P.; Gallowitsch, H.J.; Kresnik, E.; Lind, P.

    1997-01-01

    A 73-year-old patient presented a 99m Tc scintiscan with a focal tracer accumulation left and caudal of the thyroid gland. Further investigations with sonography, CT, esophagoscopy and barium swallow provided the diagnosis of achalasia as the reason for focal 99m Tc retention caudal of the thyroid gland. Explanation for 99m Tc accumulation within the esophagus may be the nonspecific accumulation of 99m Tc not only in the thyroid gland but also in the salivary glands. Excretion of the tracer follows with the saliva. Structural and motor disorders of the esophagus can thus lead to focal tracer retention within the esophagus simulating thyroid tissue. (orig.) [de

  19. Analytical techniques for measurement of 99Tc in environmental samples

    International Nuclear Information System (INIS)

    Anon.

    1979-01-01

    Three new methods have been developed for measuring 99 Tc in environmental samples. The most sensitive method is isotope dilution mass spectrometry, which allows measurement of about 1 x 10 -12 grams of 99 Tc. Results on analysis of five samples by this method compare very well with values obtained by a second independent method, which involves counting of beta particles from 99 Tc and internal conversion electrons from /sup 97m/Tc. A third method involving electrothermal atomic absorption has also been developed. Although this method is not as sensitive as the first two techniques, the cost per analysis is expected to be considerably less for certain types of samples

  20. Chemistry of /sup 99m/Tc labeling kits

    International Nuclear Information System (INIS)

    Srivastava, S.C.; Meinken, G.; Richards, P.

    1976-01-01

    Problems have been reported with the use of kit-produced /sup 99m/Tc radiopharmaceuticals. This study was undertaken to understand the chemistry involved in various stannous kit systems. The relation between Tc, tin, and the ligands used to complex the reduced Tc was investigated. It is concluded that for reliable performance, stannous kits should be prepared so that most of the tin is kept in the usable (reducing) form; a solution would be to use minimum tin and a large excess of complexing agent. Oxidation of the Tc complex to free pertechnetate is not a major problem in most kit systems. 5 figures

  1. Synthesis and comparison of 99mTc-enrofloxacin and 99mTc-ciprofloxacin.

    NARCIS (Netherlands)

    Siaens, R.H.; Rennen, H.J.J.M.; Boerman, O.C.; Dierckx, R.A.; Slegers, G.

    2004-01-01

    The use of (99m)Tc-ciprofloxacin as a tracer for infection and inflammation has been examined and discussed in the literature extensively. Its alleged ability to discriminate between sterile inflammation and bacterial versus nonbacterial infections has led to an intense debate. Other labeled

  2. Comparison of Tc-99m maraciclatide and Tc-99m sestamibi molecular breast imaging in patients with suspected breast cancer.

    Science.gov (United States)

    O'Connor, Michael K; Morrow, Melissa M B; Hunt, Katie N; Boughey, Judy C; Wahner-Roedler, Dietlind L; Conners, Amy Lynn; Rhodes, Deborah J; Hruska, Carrie B

    2017-12-01

    Molecular breast imaging (MBI) performed with 99m Tc sestamibi has been shown to be a valuable technique for the detection of breast cancer. Alternative radiotracers such as 99m Tc maraciclatide may offer improved uptake in breast lesions. The purpose of this study was to compare relative performance of 99m Tc sestamibi and 99m Tc maraciclatide in patients with suspected breast cancer, using a high-resolution dedicated gamma camera for MBI. Women with breast lesions suspicious for malignancy were recruited to undergo two MBI examinations-one with 99m Tc sestamibi and one with 99m Tc maraciclatide. A radiologist interpreted MBI studies in a randomized, blinded fashion to assign an assessment score (1-5) and measured lesion size. Lesion-to-background (L/B) ratio was measured with region-of-interest analysis. Among 39 analyzable patients, 21 malignant tumors were identified in 21 patients. Eighteen of 21 tumors (86%) were seen on 99m Tc sestamibi MBI and 19 of 21 (90%) were seen on 99m Tc maraciclatide MBI (p = 1). Tumor extent measured with both radiopharmaceuticals correlated strongly with pathologic size ( 99m Tc sestamibi, r = 0.84; 99m Tc maraciclatide, r = 0.81). The L/B ratio in detected breast cancers was similar for the two radiopharmaceuticals: 1.55 ± 0.36 (mean ± S.D.) for 99m Tc sestamibi and 1.62 ± 0.37 (mean ± S.D.) for 99m Tc maraciclatide (p = 0.53). No correlation was found between the L/B ratio and molecular subtype for 99m Tc sestamibi (r s  = 0.12, p = 0.63) or 99m Tc maraciclatide (r s  = -0.12, p = 0.64). Of 20 benign lesions, 10 (50%) were seen on 99m Tc sestamibi and 9 of 20 (45%) were seen on 99m Tc maraciclatide images (p = 0.1). The average L/B ratio for benign lesions was 1.34 ±0.40 (mean ±S.D.) for 99m Tc sestamibi and 1.41 ±0.52 (mean ±S.D.) for 99m Tc maraciclatide (p = 0.75). Overall diagnostic performance was similar for both radiopharmaceuticals. AUC from ROC

  3. Direct {sup 99m}Tc labeling of Herceptin (trastuzumab) by {sup 99m}Tc(I) tricarbonyl ion

    Energy Technology Data Exchange (ETDEWEB)

    Chen, W.-J.; Yen, C.-L.; Lo, S.-T.; Chen, K.-T. [Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Lo, J.-M. [Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan (China)], E-mail: jmlo@mx.nthu.edu.tw

    2008-03-15

    By simply incubating Herceptin (trastuzumab) with [{sup 99m}Tc(CO){sub 3}(OH{sub 2}){sub 3}]{sup +} ion in saline, a significant yield of {sup 99m}Tc-labeled trastuzumab was found to be achievable. The effective labeling may be based on that trastuzumab is inherent with endogenous histidine group to which {sup 99m}Tc(I) tricarbonyl ion can be strongly bound. For practical {sup 99m}Tc labeling processing, trastuzumab was purified beforehand from the commercial product, Herceptin (Genentech) via size exclusion chromatography to remove the excipient, {alpha}-histidine and a high-labeled yield could be obtained by incubating the purified trastuzumab with [{sup 99m}Tc(CO){sub 3}(OH{sub 2}){sub 3}]{sup +}. Retention of bioactivity of the {sup 99m}Tc(I)-labeled trastuzumab was validated using a cell binding test.

  4. Imaging of irradiated liver with Tc-99m-sulfur colloid and Tc-99m-IDA

    International Nuclear Information System (INIS)

    Gelfand, M.J.; Saha, S.; Aron, B.S.

    1981-01-01

    In three cases, irradiated regions of liver failed to concentrate Tc-99m-sulfur colloid. In two of these three, imaging with Tc-99m-acetanilide iminodiacetic acid (IDA) agents within five days showed near normal hepatic uptake of this hepatobiliary imaging agent. The hepatic parenchymal cells may be imaged with Tc-99m-IDA in some irradiated regions of liver, despite loss of reticuloendothelial cell function

  5. Sup(99m)Tc-thioglucose

    International Nuclear Information System (INIS)

    Deckart, H.; Weiland, J.; Blottner, A.; Weiss, M.L.

    1978-01-01

    A procedure for labelling thioglucose with sup(99m)Tc with an efficiency of more than 95% yielding a compound with good in vitro and in vivo stability is presented. Pharmakokinetic studies in rats show slow blood-clearance and significant binding to plasma proteins and erythrocytes. Uptake in the kidneys was high and persistent. The whole body retention curve showed components with effective half-lives of 5 h (44,7%), 1,24 h (19,3%) and 7 min (36%). Autoradiography of kidney tissue reveal concentration of the compound in the epithelial cells of the tubulus of the cortex. No excretion via the liver was observed. The new compound was compared with other kidney scanning agents. Normal controls show in agreement with the animal experiments slow blood clearance and high as well as strong binding to plasma proteins. Whole-body retention combined with organ uptake studies show fast and persistent uptake in the kidneys so that the compound can be used for kidney imaging up to 24 h after application. Cumulative renal excretion is 18% of the dose during the first six hours. Finally, comparative studies of the differences in kidney imaging in normal patients and in patients with diseased kidneys using the new compound as well as conventional scanning agents ( 197 Hg neohydrine) and other sup(99m)Tc labelled compounds are presented. (author)

  6. Expanding the knowledge of the geographic distribution of Trypanosoma cruzi TcII and TcV/TcVI genotypes in the Brazilian Amazon.

    Directory of Open Access Journals (Sweden)

    Valdirene Dos Santos Lima

    Full Text Available Trypanosoma cruzi infection is a complex sylvatic enzooty involving a wide range of animal species. Six discrete typing units (DTUs of T. cruzi, named TcI to TcVI, are currently recognized. One unanswered question concerning the epidemiology of T. cruzi is the distribution pattern of TcII and hybrid DTUs in nature, including their virtual absence in the Brazilian Amazon, the current endemic area of Chagas disease in Brazil. Herein, we characterized biological samples that were collected in previous epizootiological studies carried out in the Amazon Basin in Brazil. We performed T. cruzi genotyping using four polymorphic genes to identify T. cruzi DTUs: mini-exon, 1f8, histone 3 and gp72. This analysis was conducted in the following biological samples: (i two T. cruzi isolates obtained by culturing of stools from the triatomine species Rhodnius picttipes and (ii five serum samples from dogs in which trypomastigotes were observed during fresh blood examination. We report for the first time the presence of TcII and hybrid DTUs (TcV/TcVI in the Amazon region in mixed infections with TcI. Furthermore, sequencing of the constitutive gene, gp72, demonstrated diversity in TcII even within the same forest fragment. These data show that TcII is distributed in the five main Brazilian biomes and is likely more prevalent than currently described. It is very probable that there is no biological or ecological barrier to the transmission and establishment of any DTU in any biome in Brazil.

  7. Electrolytic 99mTcO4- reduction: a different pathway to obtain 99mTc-labelled compounds

    International Nuclear Information System (INIS)

    Savio, E.; Kremer, C.; Gambino, D.; Kremer, E.; Leon, A.

    1991-01-01

    Electrolytic reduction of 99m TcO 4 - at inert electrodes to obtain 99m Tc cationic complexes and in vitro stability of labelled compounds were studied. Amines were used as neutral N-donor ligands and a systematic analysis of various parameters involved in the reduction process was performed. Usefulness of electrolytic reduction was proved as an alternative 99m Tc-labelling method. Its most important advantages are: production of complexes with a high radiochemical purity, negligible presence of red-hyd- 99m Tc, lack of foreign materials, simplicity of development and possibility of further applications. (author)

  8. The role of Tc-99m IDA hepatobiliary and Tc-99m colloid hepatic imaging in primary biliary cirrhosis

    International Nuclear Information System (INIS)

    Aburano, T.; Yokoyama, K.; Shuke, N.; Kinuya, S.; Takayama, T.; Tonami, N.; Hisada, K.

    1991-01-01

    To assess the presence of primary biliary cirrhosis, 15 patients at various histopathologic stages were studied by Tc-99m IDA hepatobiliary and/or Tc-99m colloid hepatic imaging. In the earlier stages (I and II), seven of eight patients (88%) showed uniform hepatic retention of Tc-99m IDA. Of seven patients in the same stage, however, four (57%) showed no abnormality on Tc-99m colliod imaging. In three of these four negative patients (75%), uniform hepatic retention of Tc-99m IDA was noted. In the later stages (III and IV), all seven patients showed decreased clearance with or without delayed tracer appearance in the intestine and prominent hepatic retention on Tc-99m IDA imaging; with Tc-99m colloid imaging there was enlargement of the spleen and increased activity in the spleen and bone marrow. Thus, Tc-99m IDA imaging is considered to be more useful in revealing this functional disorder at the earlier stage of primary biliary cirrhosis and in evaluating progression from an earlier to a later stage of disease. Tc-99m colloid imaging also effectively evaluated progression

  9. Preoperative radiological diagnosis by 99mTc·MIBI-99mTc subtraction scintigraphy for primary hyperparathyroidism

    International Nuclear Information System (INIS)

    Inouye, Takahiro; Tomita, Toshiki; Shinden, Seiichi; Takagi, Hitoshi; Kano, Shigeru.

    1996-01-01

    Preoperative radiological diagnosis constitutes the most important factor for the surgical treatment of hyperparathyroidism. In this regard, MRI is useful for detecting the abnormal parathyroid, but it is often difficult to localize it using MRI only. It is thus necessary to combine this procedure with excellent subtraction scintigraphy. We performed both 201 Tl- 99m Tc and 99m Tc·MIBI- 99m Tc subtraction scintigraphy in seven patients with primary hyperparathyroidism and compared them the radiological results. Five patients presented parathyroid adenomas and the rest hypertrophy of the parathyroid. We could detect the abnormal parathyroid in four patients (57.1%) by 201 Tl- 99m Tc subtraction scintigraphy and in six patients (85.7%) by 99m Tc·MIBI- 99m Tc subtraction scintigraphy. We therefore believe that 99m Tc·MIBI- 99m Tc subtraction scintigraphy will become an essential examination for primary hyperparathyroidism rather than the presently employed 201 Tl- 99m Tc subtraction scintigraphy. (author)

  10. In-house cyclotron production of high-purity Tc-99m and Tc-99m radiopharmaceuticals.

    Science.gov (United States)

    Martini, Petra; Boschi, Alessandra; Cicoria, Gianfranco; Zagni, Federico; Corazza, Andrea; Uccelli, Licia; Pasquali, Micòl; Pupillo, Gaia; Marengo, Mario; Loriggiola, Massimo; Skliarova, Hanna; Mou, Liliana; Cisternino, Sara; Carturan, Sara; Melendez-Alafort, Laura; Uzunov, Nikolay M; Bello, Michele; Alvarez, Carlos Rossi; Esposito, Juan; Duatti, Adriano

    2018-05-30

    In the last years, the technology for producing the important medical radionuclide technetium-99m by cyclotrons has become sufficiently mature to justify its introduction as an alternative source of the starting precursor [ 99m Tc][TcO 4 ] - ubiquitously employed for the production of 99m Tc-radiopharmaceuticals in hospitals. These technologies make use almost exclusively of the nuclear reaction 100 Mo(p,2n) 99m Tc that allows direct production of Tc-99m. In this study, it is conjectured that this alternative production route will not replace the current supply chain based on the distribution of 99 Mo/ 99m Tc generators, but could become a convenient emergency source of Tc-99m only for in-house hospitals equipped with a conventional, low-energy, medical cyclotron. On this ground, an outline of the essential steps that should be implemented for setting up a hospital radiopharmacy aimed at the occasional production of Tc-99m by a small cyclotron is discussed. These include (1) target production, (2) irradiation conditions, (3) separation/purification procedures, (4) terminal sterilization, (5) quality control, and (6) Mo-100 recovery. To address these issues, a comprehensive technology for cyclotron-production of Tc-99m, developed at the Legnaro National Laboratories of the Italian National Institute of Nuclear Physics (LNL-INFN), will be used as a reference example. Copyright © 2018 Elsevier Ltd. All rights reserved.

  11. Solubility study of Tc(IV) in a granitic water

    International Nuclear Information System (INIS)

    Liu, D.J.; Yao, J.; Wang, B.; Bruggeman, C.; Maes, N.

    2007-01-01

    The deep geological disposal of the high level radioactive wastes is expected to be a safe disposal method in most countries. The long-lived fission product 99 Tc is present in large quantities in nuclear wastes and its chemical behavior in aqueous solution is of considerable interest. Under oxidizing conditions technetium exists as the anionic species TcO 4 - whereas under the reducing conditions, expected to exist in a deep geological repository, it is generally predicted that technetium will be present as TcO 2 .nH 2 O. Hence, the mobility of Tc(IV) in reducing groundwater may be limited by the solubility of TcO 2 .nH 2 O under these conditions. Due to this fact it is important to investigate the solubility of TcO 2 .nH 2 O. The solubility determines the release of radionuclides from waste form and is used as a source term in radionuclide migration analysis in performance assessment of radioactive waste repository. Technetium(IV) was prepared by reduction of a technetate solution with Sn 2+ . The solubility of Tc(IV) has been determined in simulated groundwater and redistilled water under aerobic and anaerobic conditions. The effects of pH and CO 3 2- concentration of solution on solubility of Tc(IV) were studied. The concentration of total technetium and Tc(IV) species in the solutions were periodically determined by separating the oxidized and reduced technetium species using a solvent extraction procedure and counting the beta activity of the 99 Tc with a liquid scintillation counter. The experimental results show that the rate of oxidation of Tc(IV) in simulated groundwater and redistilled water is about (1.49 ∝ 1.86) x 10 -9 mol L -1 d -1 under aerobic conditions, while no Tc(IV) oxidation was detected in simulated groundwater and redistilled water under anaerobic conditions. Under aerobic or anaerobic conditions the solubility of Tc(IV) in simulated groundwater and redistilled water is equal on the whole after centrifugation or ultrafiltration. The

  12. 99mTc-MIBI, 99mTc-tetrofosmin and 99mTc-Q12 in vitro and in vivo

    International Nuclear Information System (INIS)

    Bernard, Bert F.; Krenning, Eric P.; Breeman, Wout A. P.; Ensing, Geert; Benjamins, Harry; Bakker, Willem H.; Visser, Theo J.; Jong, Marion de

    1998-01-01

    The aim of this study was to compare uptake of 99m Tc-MIBI, 99m Tc-tetrofosmin and 99m Tc-Q12 in vitro and biodistribution in vivo in rats. In vitro, uptake decreased in the order MIBI→tetrofosmin→Q12. Uptake of MIBI and tetrofosmin, but not of Q12, in cultured tumor cells was dependent on the plasma membrane and mitochondrial potential. In vivo, heart uptake of all three compounds was high and stable. Tumor uptake decreased in the order MIBI→Q12→tetrofosmin and the tumor/blood ratio in the order MIBI→tetrofosmin→Q12

  13. Comparison of relative renal function measured with either 99m Tc-DTPA or 99m Tc-EC dynamic scintigraphies with that measured with 99m Tc-DMSA static scintigraphy

    Energy Technology Data Exchange (ETDEWEB)

    Domingues, F.C.; Fujikawa, G.Y.; Decker, H.; Alonso, G.; Pereira, J.C.; Duarte, P.S. [Centro de Diagnostico Fleury, Sao Paulo, SP (Brazil). Secao de Medicina Nuclear; Sao Paulo Univ. (USP), SP (Brazil). Escola de Saude Publica. Dept. de Epidemiologia]. E-mail: paulo.duarte@fleury.com.br

    2006-07-15

    Objective: The aim of this study was to compare the renal function measured with either {sup 99m}Tc-DTPA or {sup 99m}Tc-EC dynamic scintigraphies with that measured using {sup 99m}Tc-DMSA static scintigraphy. Methods: the values of relative renal function measured in 111 renal dynamic scintigraphies performed either with {sup 99m}Tc-DTPA (55 studies) or with {sup 99m}Tc-EC (56 studies) were compared with the relative function measured using {sup 99m}Tc-DMSA static scintigraphy performed within a 1-month period. The comparisons were performed using Wilcoxon signed rank test. The number of {sup 99m}Tc-DTPA and {sup 99m}Tc-EC studies that presented relative renal function different by more than 5% from that measured with {sup 99m}Tc-DMSA, using chi square test were also compared. Results: the relative renal function measured with {sup 99m}Tc-EC is not statistically different from that measured with {sup 99m}Tc-DMSA (p = 0.97). The relative renal function measured with {sup 99m}Tc-DTPA was statistically different from that measured using {sup 99m}Tc-DMSA, but with a borderline statistical significance (p = 0.05). The number of studies with relative renal function different by more than 5% from that measured with {sup 99m}Tc-DMSA is higher for the {sup 99m}Tc-DTPA scintigraphy (p 0.04) than for {sup 99m}Tc-EC. Conclusion: the relative renal function measured with {sup 99m}Tc-EC dynamic scintigraphy is comparable with that measured with {sup 99m}Tc-DMSA static scintigraphy, while the relative renal function measured with {sup 99m}Tc-DTPA dynamic scintigraphy presents a significant statistical difference from that measured with {sup 99m}Tc-DMSA static scintigraphy. (author)

  14. Comparison of relative renal function measured with either 99m Tc-DTPA or 99m Tc-EC dynamic scintigraphies with that measured with 99m Tc-DMSA static scintigraphy

    International Nuclear Information System (INIS)

    Domingues, F.C.; Fujikawa, G.Y.; Decker, H.; Alonso, G.; Pereira, J.C.; Duarte, P.S.; Sao Paulo Univ.

    2006-01-01

    Objective: The aim of this study was to compare the renal function measured with either 99m Tc-DTPA or 99m Tc-EC dynamic scintigraphies with that measured using 99m Tc-DMSA static scintigraphy. Methods: the values of relative renal function measured in 111 renal dynamic scintigraphies performed either with 99m Tc-DTPA (55 studies) or with 99m Tc-EC (56 studies) were compared with the relative function measured using 99m Tc-DMSA static scintigraphy performed within a 1-month period. The comparisons were performed using Wilcoxon signed rank test. The number of 99m Tc-DTPA and 99m Tc-EC studies that presented relative renal function different by more than 5% from that measured with 99m Tc-DMSA, using chi square test were also compared. Results: the relative renal function measured with 99m Tc-EC is not statistically different from that measured with 99m Tc-DMSA (p = 0.97). The relative renal function measured with 99m Tc-DTPA was statistically different from that measured using 99m Tc-DMSA, but with a borderline statistical significance (p = 0.05). The number of studies with relative renal function different by more than 5% from that measured with 99m Tc-DMSA is higher for the 99m Tc-DTPA scintigraphy (p 0.04) than for 99m Tc-EC. Conclusion: the relative renal function measured with 99m Tc-EC dynamic scintigraphy is comparable with that measured with 99m Tc-DMSA static scintigraphy, while the relative renal function measured with 99m Tc-DTPA dynamic scintigraphy presents a significant statistical difference from that measured with 99m Tc-DMSA static scintigraphy. (author)

  15. {sup 201}Tl, {sup 99m}Tc-MIBI, {sup 99m}Tc-tetrofosmin and {sup 99m}Tc-furifosmin: relative retention and clearance kinetics in retrogradely perfused guinea pig hearts

    Energy Technology Data Exchange (ETDEWEB)

    Schaefer, Wolfgang M.; Moka, Detlef E-mail: detlef.moka@uni-koeln.de; Brockmann, Holger A.; Schomaecker, Klaus; Schicha, Harald

    2002-02-01

    Myocellular kinetics of {sup 201}Tl, {sup 99m}Tc-MIBI, {sup 99m}Tc-tetrofosmin and {sup 99m}Tc-furifosmin were investigated using retrogradely-perfused guinea-pig hearts. Relative retention decreased in the order {sup 99m}Tc-MIBI {yields}{yields} implies {sup 99m}Tc-tetrofosmin {yields}{yields} implies {sup 99m}Tc-furifosmin. {sup 201}Tl and {sup 99m}Tc-MIBI exhibited bi- (t1,t2), {sup 99m}Tc-tetrofosmin and {sup 99m}Tc-furifosmin triexponential (t1,t2,t3) time-activity-curves. Latest-phase elimination-half-life increased from {sup 201}Tl (t2) {yields}{yields} implies {sup 99m}Tc-MIBI (t2) {yields}{yields} implies {sup 99m}Tc-tetrofosmin (t3) {yields}{yields} implies {sup 99m}Tc-furifosmin (t3), showing a significant increase in deteriorating myocardium for all tracers but {sup 99m}Tc-furifosmin. Delayed elimination in deteriorating myocardium explains at least partly the redistribution phenomenon of {sup 201}Tl, and suggests a similar phenomenon for {sup 99m}Tc-MIBI and {sup 99m}Tc-tetrofosmin.

  16. Prognóstico visual de 'crosslinking' para ceratocone com base em tomografia de córnea pré-operatória

    Directory of Open Access Journals (Sweden)

    Lopes Bernardo

    2014-08-01

    Full Text Available Objetivo: Verificar índices tomográficos do pré-operatório de pacientes com ceratocone submetidos à crosslinking corneano (CXL como fatores preditivos para a melhora na acuidade visual corrigidas (AVc após um ano. Métodos: Estudo retrospectivo que incluiu 63 olhos de 53 pacientes com ceratocone progressivo submetidos à CXL segundo o protocolo de Dresden: deseptelização corneana, riboflavina 0,1% por 30 minutos e luz ultra-violeta A (UVA a uma irradiância de 3mW/cm2 por 30 minutos. Foram avaliados exames de tomografia corneana com sistema de Scheimpflug rotacional (Pentacam, Oculus antes do CXL e a acuidade visual corrigida antes e após a cirurgia. A análise estatística foi feita com o teste de Kolmorov-Smirnov, teste t de student e curvas de característica operador-receptor (ROC. Resultados: Houve diferença estatisticamente significante (p<0,05 entre os pacientes que obtiveram melhora de AVc em um ano e os que não experimentaram melhora na AVc nesse período nos índices tomográficos pré-operatórios relacionados com espessura e volume corneano. Entre os pacientes que obtiveram melhora na AVc todos possuíam volume corneano em 6,0mm maior que 14,55mm3 e 97,2% deles possuíam volume corneano em 6,5mm maior que 17,76mm3. Assim como, 94,29% desses pacientes apresentavam paquimetria média em 4,0mm maior que 487 μm e 82,86% paquimetria no ponto mais fino maior de 421 μm. Conclusão: Pacientes com ceratocone menos avançado (volume e espessura da córnea maiores no período pré-operatório obtiveram mais chances de ter melhora da AVc um ano após CXL. Estudos prospectivos envolvendo outras variáveis relacionadas com a aberrometria total e o estudo biomecânico da córnea são relevantes para se aumentar a capacidade prognóstica do resultado após CXL.

  17. Evaluation of the absorbed dose to the kidneys due to Tc{sup 99m} (DTPA) / Tc{sup 99m} (Mag3) and Tc{sup 99m} (Dmsa); Evaluacion de la dosis absorbida en los rinones debido al Tc{sup 99m} (DTPA) / Tc{sup 99m} (MAG3) y Tc{sup 99m} (DMSA)

    Energy Technology Data Exchange (ETDEWEB)

    Vasquez A, M.; Murillo C, F.; Castillo D, C.; Rocha J, J.; Sifuentes D, Y.; Sanchez S, P. [Universidad Nacional de Trujillo, Av. Juan Pablo II s/n, Trujillo (Peru); Idrogo C, J.; Marquez P, F., E-mail: marvva@hotmail.com [Instituto Nacional de Enfermedades Neoplasicas, Av. Angamos 2520, Lima (Peru)

    2015-10-15

    The absorbed dose in the kidneys of adult patients has been assessed using the biokinetics of radiopharmaceuticals containing Tc{sup 99m} (DTPA) / Tc{sup 99m} (Mag3) or Tc{sup 99m} (Dmsa).The absorbed dose was calculated using the formalism MIRD and the Cristy-Eckerman representation for the kidneys. The absorbed dose to the kidneys due to Tc{sup 99m} (DTPA) / Tc{sup 99m} (Mag3), are given by 0.00466 mGy.MBq{sup -1} / 0.00339 mGy.MBq{sup -1}. Approximately 21.2% of the absorbed dose is due to the bladder (content) and the remaining tissue, included in biokinetics of Tc{sup 99m} (DTPA) / Tc{sup 99m} (Mag3). The absorbed dose to the kidneys due to Tc{sup 99m} (Dmsa) is 0.17881 mGy.MBq{sup -1}. Here, 1.7% of the absorbed dose is due to the bladder, spleen, liver and the remaining tissue, included in biokinetics of Tc{sup 99m} (Dmsa). (Author)

  18. Cytological effects of Tc on young soybean plants

    International Nuclear Information System (INIS)

    Neel, J.W.; Onasch, M.A.

    1989-01-01

    Soybean seedlings (Glycine max cv. Williams) were exposed for 24 to 67 h to 99 TcO 4 - (Tc) at various concentrations in dilute culture solution. Reduced primary leaf midrib length was observed with 67-h exposures to greater than or equal to 6.0 mu M Tc. Cellular effects were consistently observed by a light microscope after 43-h or longer exposure to 6.6 microM Tc and higher concentrations. At lower Tc levels, abnormal cells were interspersed among cells of normal appearance. Abnormal cells displayed blockshaped nuclei which were more densely stained by Harris' hematoxylineosin Y than controls; such cells frequently demonstrated incipient plasmolysis. The number of affected cells increased with dose; both nuclei and cytoplasm demonstrated greater staining intensity and more severe plasmolysis at higher levels. At levels of greater than or equal to 13.2 Tc, cellular damage was extensive. Cells were reduced in size and were highly plasmolysed; cell walls were distorted, and intercellular spaces were reduced or became nonexistent. Mitotic activity was observed at Tc levels less than or equal to 9.9 microM. Observed Tc cellular effects are attributed principally to the alteration of membrane permeability characteristics

  19. Performance of TcI/TcVI/TcII Chagas-Flow ATE-IgG2a for universal and genotype-specific serodiagnosis of Trypanosoma cruzi infection.

    Directory of Open Access Journals (Sweden)

    Glaucia Diniz Alessio

    2017-03-01

    Full Text Available Distinct Trypanosoma cruzi genotypes have been considered relevant for patient management and therapeutic response of Chagas disease. However, typing strategies for genotype-specific serodiagnosis of Chagas disease are still unavailable and requires standardization for practical application. In this study, an innovative TcI/TcVI/TcII Chagas Flow ATE-IgG2a technique was developed with applicability for universal and genotype-specific diagnosis of T. cruzi infection. For this purpose, the reactivity of serum samples (percentage of positive fluorescent parasites-PPFP obtained from mice chronically infected with TcI/Colombiana, TcVI/CL or TcII/Y strain as well as non-infected controls were determined using amastigote-AMA, trypomastigote-TRYPO and epimastigote-EPI in parallel batches of TcI, TcVI and TcII target antigens. Data demonstrated that "α-TcII-TRYPO/1:500, cut-off/PPFP = 20%" presented an excellent performance for universal diagnosis of T. cruzi infection (AUC = 1.0, Se and Sp = 100%. The combined set of attributes "α-TcI-TRYPO/1:4,000, cut-off/PPFP = 50%", "α-TcII-AMA/1:1,000, cut-off/PPFP = 40%" and "α-TcVI-EPI/1:1,000, cut-off/PPFP = 45%" showed good performance to segregate infections with TcI/Colombiana, TcVI/CL or TcII/Y strain. Overall, hosts infected with TcI/Colombiana and TcII/Y strains displayed opposite patterns of reactivity with "α-TcI TRYPO" and "α-TcII AMA". Hosts infected with TcVI/CL strain showed a typical interweaved distribution pattern. The method presented a good performance for genotype-specific diagnosis, with global accuracy of 69% when the population/prototype scenario include TcI, TcVI and TcII infections and 94% when comprise only TcI and TcII infections. This study also proposes a receiver operating reactivity panel, providing a feasible tool to classify serum samples from hosts infected with distinct T. cruzi genotypes, supporting the potential of this method for universal and genotype-specific diagnosis

  20. Dissecção da artéria basilar: relato de caso

    Directory of Open Access Journals (Sweden)

    TOGNOLA WALDIR ANTONIO

    2000-01-01

    Full Text Available Relato de um caso de dissecção da artéria basilar, documentado com neuroimagem (tomografia computadorizada do crânio, ressonância magnética e angiografia digital com subtração de imagem.

  1. Nuclear quadrupole moment of the 99Tc ground state

    International Nuclear Information System (INIS)

    Errico, Leonardo; Darriba, German; Renteria, Mario; Tang Zhengning; Emmerich, Heike; Cottenier, Stefaan

    2008-01-01

    By combining first-principles calculations and existing nuclear magnetic resonance (NMR) experiments, we determine the quadrupole moment of the 9/2 + ground state of 99 Tc to be (-)0.14(3)b. This confirms the value of -0.129(20)b, which is currently believed to be the most reliable experimental determination, and disagrees with two earlier experimental values. We supply ab initio calculated electric-field gradients for Tc in YTc 2 and ZrTc 2 . If this calculated information would be combined with yet to be performed Tc-NMR experiments in these compounds, the error bar on the 99 Tc ground state quadrupole moment could be further reduced

  2. 99Tc in the Irish Sea. Recent trends

    International Nuclear Information System (INIS)

    McCartney, M.; Rajendran, K.

    1997-01-01

    The increase in discharges of 99 Tc from Sellafield has resulted in an ideal opportunity to study the behaviour of this radionuclide in the aquatic environment. Results, thus far, have demonstrated that 99 Tc uptake by seaweeds collected from around the Irish Sea has followed the anticipated trend, with brown seaweeds accumulating 100-1000 times more 99 Tc than red or green algae. The large increase in discharges of 99 Tc from Sellafield in 1994 had been matched by a similar increase in the levels present in brown seaweeds, mussels and winkles for which concentration factors of 24000, 5000 and 100, respectively, have been derived. This confirms the observation that 99 Tc uptake by marine organisms in the field far exceeds that which would be expected from laboratory studies. Thus, it is concluded that, given the radiological importance of this nuclide, the provision of more accurate information on its environmental behaviour is required. (author)

  3. /sup 99m/Tc labelled ulcer avid agents

    International Nuclear Information System (INIS)

    Scopinaro, F.; Linari, G.; Baldieri, M.; Liberatore, M.; Corti, E.; Signori, C.

    1986-01-01

    Sulfated oligosaccharides have some interesting pharmacological properties: they are anticoagulants and protect the ulcerative areas of epithelia by precipitating over ulcers together with exudative proteins. Some sucralfate labelling methods using /sup 75/Se, /sup 111/In, /sup 99m/Tc-albumin and /sup 99m/Tc-DTPA have been reported. Only the /sup 99m/Tc-sucralfate has, at present, the requisites to be used as an ulcer-seeking agent. The aim of this study were: (a) to introduce a simple and easy-to-repeat method for the labelling of sucralfate with /sup 99m/Tc-DTPA; (b) to demonstrate that it is possible to label the sucrose octasulfate directly with /sup 99m/Tc without the aid of other ligands (e.g. DTPA)

  4. Abdominal adipose tissue distribution in obese children. US versus CT measurements; Valutazione della distribuzione del tessuto adiposo addominale nei bambini obesi. Confronto tra ecografia e Tomografia Computerizzata

    Energy Technology Data Exchange (ETDEWEB)

    Ferrozzi, F.; Zuccoli, G.; Tognini, G.; Castriota-Scanderbeg, A.; Bacchini, E. [Parma Univ., Parma (Italy). Ist. di Scienze Radiologiche; Bernasconi, S. [Modena Univ., Modena (Italy). Clinica Pediatrica; Campani, R. [Pavia Univ., Pavia (Italy). Ist. di Radiologia

    1999-12-01

    Computed Tomography (CT) and, more recently, ultrasound (US), have proved excellent tools for quantifying adipose tissue distribution. Body fat distribution is an important factor in the treatment of obesity and its complications. In this work it is investigated the correlation between CT and US measurements in pediatric obesity. Forty obese children and adolescents aged 4.1-14.8 years were submitted to CT and US. Intra-abdominal, subcutaneous and total body fat were calculated (in cm{sup 2}), with the CT image analysis software. The rectus muscle-spine and rectus muscle-aorta distances, as indicative of visceral fat thickness, were measured on US images with(out) compression. The distance between skin fat and fat-rectus muscle interfaces was measured as subcutaneous fat thickness. US-CT findings have been compared with other morphometric variables-i.e., patient's (ideal) body weight and skin fold measures. A statistically significant correlation was found between the CT measurement of visceral fat and the aorta-rectus muscle and rectus muscle-spine distances (r=0.80 and 0.74, respectively). The US measurements of subcutaneous fat were correlated with CT subcutaneous fat area (r=0.82). No correlation was found between overweight, as calculated by body mass index, and CT or US fat. In conclusions, the findings indicate that US is as useful as CT in evaluating body fat distribution in pediatric obesity. [Italian] La TC e piu' recentemente l'ecografia si sono dimostrate eccellenti tecniche di valutazione della quantita' e della distribuzione del tessuto adiposo corporeo. La compartimentazione del grasso corporeo ha, infatti, importanti implicazioni per il trattamento dell'obesita' e delle sue complicanze. Scopo dello studio e' stato quello di correlare i risultati ottenuti con la TC con quelli ecografici nella valutazione dell'obesita' del paziente pediatrico. Quaranta bambini obesi con eta' compresa tra 4,1 e 14

  5. AC losses in high Tc superconductors

    International Nuclear Information System (INIS)

    Campbell, A.M.

    1998-01-01

    Full text: Although in principle the AC losses in high Tc superconductors can be calculated from the critical current density, a number of complications make this difficult. The Jc is very field dependent, there are intergranular and intragranular critical currents, the material is anisotropic and there is usually a large demagnetising factor. Care must be taken in interpreting electrical measurements since the voltage depends on the position of the contacts. In spite of these complications the simple theory of Norris has proved surprisingly successful and arguments will be presented as to why this is the case. Results on a range of tapes will be compared with theory and numerical methods for predicting losses discussed. Finally a theory for coupling losses will be given for a composite conductor with high resistance barriers round the filaments

  6. RILEM TC ISR Summer 2015 Activity Report

    Energy Technology Data Exchange (ETDEWEB)

    Le Pape, Yann [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2015-08-01

    With aging infrastructures, instances of Alkali Silica Reaction (ASR) and Delayed Ettringite Formation (DEF), broadly covered under the term Internal Swelling Reaction (ISR), are increasingly being detected. They have been observed in bridges, dams, and most recently in nuclear power plants. Concrete swelling may result in bridge partial failure, dams with structural cracks and misaligned turbine shafts, and locked slice gates. For nuclear reactors micro-cracks may cause increased gas permeability which will jeopardize the containment integrity and may decrease the residual structural resistance under accidental loading. This TC, which limits its activity to structures with known expansive concrete, seeks to address two complementary but fundamental questions: a) What is the kinetics of the reaction and b) How would it affect the integrity of the structure (serviceability and strength) and thus establish a science based prognostic to the structure owner.

  7. 99mTc-RBC subtraction scintigraphy

    International Nuclear Information System (INIS)

    Inagaki, Syoichi; Tonami, Syuichi; Yasui, Masakazu; Kuranishi, Makoto; Sugishita, Kouki; Nakamura, Mamoru

    1994-01-01

    Sequential abdominal scintigrams with 99m Tc-labelled red blood cells (RBC) were subtracted for observing a site of gastrointestinal bleeding and calculating the bleeding rate. This method is technically very easy and can detect the site of bleeding with the minimum rate, as low as 0.2 ml/min., in a phantom experiment. In 23 cases with final diagnosis of gastrointestinal bleeding, conventional non-subtraction scintigraphy detected only 30% (7/23), but subtraction scintigraphy detected 61% (14/23). It was concluded that subtraction scintigraphy had higher sensitivity than conventional scintigraphy for early diagnosing bleeding. A combination of non-subtraction and subtraction scintigraphy is recommended to detect a site of gastrointestinal bleeding in a clinical setting. (author)

  8. Status of Tc-99m and 99Mo/99mTc generator production in Bangladesh

    International Nuclear Information System (INIS)

    Abedin, Md. Zainul; Haque, Md. Azizul; Ali, Md. Ramjan; Hossain, Md. Anwar; Razzaque, Md. Abdur; Yasmin, Lyzu; Waheed, M. Fatima; Akhter, Rabeya; Mondal, Rafiuddin

    2007-01-01

    Radioisotope Production Division (RIPD) produced instant technetium-99m by solvent extraction method for several years. On R and D basis, the division produced portable sterile Tc-99m sublimation generator by irradiating titanium molybdate in the reactor. The division produced (4/batch) from imported fission Mo-99 till June 2005. Since August 2005, as per demand of the government hospitals, the division have been producing 12-14 pieces of 15 GBq chromatographic 99m Tc-generators weekly by using the new generator production plant installed last year having online Mo-99 loading system with the of producing 50 generator per batch. Development of PZC and (n,γ) 99 Mo based generator holds potential in Bangladesh. (author)

  9. Soil-to-plant transfer of 99mTc: how to determine Tc-species in uptake and transport processes?

    International Nuclear Information System (INIS)

    Krijger, G. C.; Van Elswijk, D. A.; Wolterbeek, H. Th.

    1995-01-01

    Selective extraction, filtration and capillary electrophoresis were used to recognize problems dealing with complexation, oxidation and ligand-exchange processes during collection and analysis of Tc-species in xylem exudates, while 99m Tc-citrate was used as a marker complex. Relatively unstable Tc-species were synthesized in xylem exudates. Oxidation of relative unstable Tc-species during the collection of xylem exudates was suggested, requiring new, better procedures to recognize Tc-species representative for the plant interior. (author)

  10. 99mTc-MAG3: can it be a viable alternative to 99mTc-DTPA ?

    International Nuclear Information System (INIS)

    Bal, C.S.; Padhy, A.K.; Nair, R.; Gopinath, P.G.

    1991-01-01

    The purpose of this study was to assess the potentials of 99m Tc MAG 3 to replace universally used 99m Tc-DTPA as a routine renal agent. Five patients with different nephrological problems were first studied with 99m Tc MAG 3 and then reinvestigated with 99m Tc-DTPA two to seven days later. Renal MAG 3 gamma camera images were found to be almost identical with those of 99m Tc-DTPA images except high hepatic and splenic uptake of the former compound in four out of five patients (80%) irrespective of kidney function. MAG 3 and DTPA renograms showed identical differential renal uptake function (r=0.87) with slightly higher uptake in right kidneys. Time to reach the peak correlated well (r=0.91). Time to reach half maximum renal activity was also found to be almost identical (r=0.97) for MAG 3 and DTPA. It was felt that the age old 99m Tc-DTPA is as good a compound as 99m Tc MAG 3 with regard to imaging and assessment of renal uptake, drainage and differential renal functions. 99m Tc-DTPA is much cheaper, readily available in India and stable to suit the logistics in a busy nuclear medicine department for routine renography. (author). 10 refs., 2 figs., 3 tabs

  11. Vertical distributions of (99)Tc and the (99)Tc/(137)Cs activity ratio in the coastal water off Aomori, Japan.

    Science.gov (United States)

    Nakanishi, Takahiro; Zheng, Jian; Aono, Tatsuo; Yamada, Masatoshi; Kusakabe, Masashi

    2011-08-01

    Using a sector-field ICP-MS the vertical distributions of the (99)Tc concentration and (99)Tc/(137)Cs activity ratio were measured in the coastal waters off Aomori Prefecture, Japan, where a spent-nuclear-fuel reprocessing plant has begun test operation. The (99)Tc concentrations in surface water ranged from 1.8 to 2.4 mBq/m(3), no greater than the estimated background level. Relatively high (99)Tc/(137)Cs activity ratios (10-12 × 10(-4)) would be caused by the inflow of the high-(99)Tc/(137)Cs water mass from the Japan Sea. There is no observable contamination from the reprocessing plant in the investigated area. The (99)Tc concentration and the (99)Tc/(137)Cs activity ratio in water column showed gradual decreases with depth. Our results implied that (99)Tc behaves in a more conservative manner than (137)Cs in marine environments. Copyright © 2011 Elsevier Ltd. All rights reserved.

  12. Concentration of sup(99m)Tc from the eluate of 99Mo-sup(99m)Tc generators

    International Nuclear Information System (INIS)

    Saucedo, T.; Mora, M.; Fraga de Suarez, A.H.; Mitta, A.E.A.

    1976-04-01

    A method is described to concentrate sup(99m)Tc solutions, originated in 99 Mo-sup(99m)Tc generators, independent of its age. The techniques of preparation of the different radiopharmaceuticals used in nuclear medicine are also described. (author) [es

  13. Critical temperatures Tc estimated by Josephson-junction array model of layered high Tc superconductors

    International Nuclear Information System (INIS)

    Kawabata, C.; Shenoy, S.R.; Bishop, A.R.

    1994-11-01

    We model high T c superconductors (HTS) by quantum capacitive Josephson junction arrays (JJA), with Angstrom-scale parameters, to obtain an estimate of Tc trends. The basic idea is as follows. Number (or change) and phase are conjugate variables, with the uncertainty products obeying ΔN · Δ Θ > 1. Thus, in HTS, global phase coherence is opposed by charging-energy induced quantum phase fluctuations, especially across Josephson-coupled CuO 2 planes. These have separation d 1 and effective interplanar dielectric constant ε, e.g. from Y atoms in YBaCuO. Decreasing the interplane charging energy E 0 perpendicular to ∼ d 1 /ε, raises Tc. In Section 1, we motivate a modelling of HTS phase excitations by a quantum capacitive 3D JJA model, with XY planar phases. Section 2 gives a physical picture of the HTS transition, relating the complex layered HTS structure to a simpler ''intermediate level'' quantum 3D JJA/XY model. Section 3 sets up a path integral (3+1)D model that reduces to a previously studied anisotropic 3D XY/JJA model, with constants renormalized in some way, by the capacitance. Postponing a detailed analysis to elsewhere, we make a heuristic estimate for the reduction of the previous Tc, by the charging energy. (author). 30 refs, 8 figs

  14. Preparation of 99mTc-thiourea complex as a precursor for Tc(III) labeled compounds

    International Nuclear Information System (INIS)

    Rey, A.; Teran, M.; Molina, S.; Leon, A.; Kremer, C.; Gambino, D.; Kremer, E.

    1996-01-01

    Ligand exchange is one of the possible synthetic routes to obtain 99m Tc coordination compounds. However, the success of this route depends on the availability of good precursors. The objective of this work is the preparation of the complex [ 99m Tc (tu) 6 ] 3+ (tu = thiourea), as a potential precursor for 99m Tc(III) coordination compounds. The preparation was successfully performed in acidic conditions, the excess of tu serving as reducing agent. At pH values higher than 3, the compound becomes unstable and on addition of polydentate ligands new Tc(III) complexes are formed. With edta, the complex 99m Tc(III)-edta was obtained in high yield. (author). 13 refs., 3 tabs

  15. Breast-milk radioactivity after a Tc-99m DTPA aerosol/Tc-99m MAA lung study

    International Nuclear Information System (INIS)

    Mountford, P.J.; Hall, F.M.; Wells, C.P.; Coakley, A.J.

    1984-01-01

    Measurements were made of the concentration of Tc-99m activity in samples of breast milk following an administration of Tc-99m DTPA aerosol for a lung ventilation image and one of Tc-99m MAA for lung perfusion. The activity was 222 nCi/ml of milk (8.2 kBq/ml) at 2 hr after the MAA injection, and it was found to be excreted exponentially with an effective half-life of 4.6 hr. There was a small incorporation of Tc-99m into breast-milk protein. The authors conclude that the combined use of these two Tc-99m agents did not indicate the interruption of breast feeding beyond 24 hr after administration of the MAA, and that for an aerosol ventiliation study alone, breast feeding need not be interrupted for more than 4 hr after the test

  16. Evolution of 99Tc Species in Cementitious Nuclear Waste Form

    International Nuclear Information System (INIS)

    Um, Woo Yong; Westsik, Joseph H.

    2011-01-01

    Technetium (Tc) is produced in large quantities as a fission product during the irradiation of 235 U-enriched fuel for commercial power production and plutonium genesis for nuclear weapons. The most abundant isotope of Tc present in the wastes is 99 Tc because of its high fission yield (∼6%) and long half-life (2.13x10 5 years). During the Cold War era, generation of fissile 239 Pu for use in America's atomic weapons arsenal yielded nearly 1900 kg of 99 Tc at the U.S. Department of Energy's (DOE) Hanford Site in southeastern Washington State. Most of this 99 Tc is present in fuel reprocessing wastes temporarily stored in underground tanks awaiting retrieval and permanent disposal. After the wastes are retrieved from the storage tanks, the bulk of the high-level waste (HLW) and lowactivity waste (LAW) stream is scheduled to be converted into a borosilicate glass waste form that will be disposed of in a shallow burial facility called the Integrated Disposal Facility (IDF) at the Hanford Site. Even with careful engineering controls, volatilization of a fraction of Tc during the vitrification of both radioactive waste streams is expected. Although this volatilized Tc can be captured in melter off-gas scrubbers and returned to the melter, some of the Tc is expected to become part of the secondary waste stream from the vitrification process. The off-gas scrubbers downstream from the melters will generate a high pH, sodium-ammonium carbonate solution containing the volatilized Tc and other fugitive species. Effective and cost-efficient disposal of Tc found in the off-gas scrubber solution remains difficult. A cementitious waste form (Cast Stone) is one of the nuclear waste form candidates being considered to solidify the secondary radioactive liquid waste that will be generated by the operation of the waste treatment plant (WTP) at the Hanford Site. Because Tc leachability from the waste form is closely related with Tc speciation or oxidation state in both the simulant

  17. Triamide mercaptide (N/sub 3/S) ligands for Tc-99m as potential Tc-99m renal function agents

    International Nuclear Information System (INIS)

    Fritzberg, A.R.; Kasina, S.; Johnson, D.L.; Eshima, D.

    1985-01-01

    A number of diamide dimercaptide (N/sub 2/S/sub 2/) complexes of Tc-99m have shown potential as renal tubular function radiopharmaceuticals that could replace radioiodinated hippurate (OIH). Evaluation of such ligands suggested that maximum efficiency for tubular secretion and specificity resulted from addition of a carboxylate group. However, such derivatives resulted in chelate ring stereoisomers that were differently transported by the renal tubular system. The problem of stereoisomers was obviated by replacing one sulfur with an effectively planar amido nitrogen. Groups on the nitrogen then result in diastereomers only when an additional asymetric center is present. A series of triamide mercaptide compounds have been synthesized to evaluate this class as ligands for Tc-99m. One of the simplest of the series, mercaptoacetylglycylglycylglycine (MAG/sub 3/), formed a single Tc-99m product in high yield as determined by HPLC. Preliminary results with pmr and ms of the Tc-99 complex indicate a structure consistent with a 1:1 metal to ligand ratio and monooxo technetium group. Biological evaluation of Tc-99m MAG/sub 3/ showed high renal specificity and rate of excretion exceeding OIH in several species including humans. Members of the N/sub 3/S series studied include mercaptoacetylglycylglycyl-amino acids. In some cases with second asymmetric centers, two components were seen on HPLC. In mice several dianionic Tc-99m complexes were excreted faster than OIH, Tc-99m MAG/sub 2/-ala, -asn, and -gln. Trianionic Tc-99m MAG/sub 2/-asp and -glu were excreted more slowly, and Tc-99m MAG/sub 2/-phe showed hepatobiliary excretion. Triamide mercaptides represent a new ligand class for Tc-99m

  18. Impeding 99Tc(IV) mobility in novel waste forms

    Science.gov (United States)

    Lee, Mal-Soon; Um, Wooyong; Wang, Guohui; Kruger, Albert A.; Lukens, Wayne W.; Rousseau, Roger; Glezakou, Vassiliki-Alexandra

    2016-01-01

    Technetium (99Tc) is an abundant, long-lived radioactive fission product whose mobility in the subsurface is largely governed by its oxidation state. Tc immobilization is crucial for radioactive waste management and environmental remediation. Tc(IV) incorporation in spinels has been proposed as a novel method to increase Tc retention in glass waste forms during vitrification. However, experiments under high-temperature and oxic conditions show reoxidation of Tc(IV) to volatile pertechnetate, Tc(VII). Here we examine this problem with ab initio molecular dynamics simulations and propose that, at elevated temperatures, doping with first row transition metal can significantly enhance Tc retention in magnetite in the order Co>Zn>Ni. Experiments with doped spinels at 700 °C provide quantitative confirmation of the theoretical predictions in the same order. This work highlights the power of modern, state-of-the-art simulations to provide essential insights and generate theory-inspired design criteria of complex materials at elevated temperatures. PMID:27357121

  19. A new look at 99Tc releases to the atmosphere

    International Nuclear Information System (INIS)

    Till, J.E.; Hoffman, F.O.; Dunning, D.E. Jr.

    1979-01-01

    Recent experimental data suggest that the uptake of 99 Tc by vegetation from soils may be two to three orders of magnitude higher than the 0.25 value currently being used in radiological assessments. Following a survey of the literature, a concentration factor of 50 was applied to evaluate the dose from a 1.0 Ci/yr-release to the atmosphere by a hypothetical uranium enrichment facility. Doses to the GI tract and thyroid of an adult living 1600 m from the facility were 18 mrem and 80 mrem respectively. These doses are delivered entirely through transport of 99 Tc through food chain pathways. This assessment indicates a potential for 99 Tc exposures to exceed recently proposed standards of the U.S. Environmental Protection Agency in 40 CFR 190. The previously assumed concentration factor of 0.25 would have produced corresponding doses of 0.13 mrem to the GI tract and 0.57 mrem to the thyroid. The results of this analysis demonstrate the need for additional research on the environmental behaviour and dosimetry of 99 Tc. In particular, data are needed to elucidate the retention of 99 Tc in soils and the uptake of 99 Tc by edible vegetation in field studies simulating chronic exposure conditions. Data on the uptake and retention of 99 Tc in humans are also necessary to improve the reliability of dose conversion factors for specific organs and various age groups. (author)

  20. Tc-99m Ciprofloxacin SPECT of Pulmonary Tuberculosis

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Min Kyung; Hwang, Kyung Hoon [Gachon University Gil Hospital, Incheon (Korea, Republic of); Yoon, Min Ki [Good Samaritan Hospital, Pohang (Korea, Republic of); Choe, Won Sick [Kangbuk Samsung Hospital, Seoul (Korea, Republic of)

    2010-06-15

    Tc-99m ciprofloxacin is available for imaging infection. However, there has been no study on employing single photon emission computed tomography (SPECT) with using Tc-99m ciprofloxacin to image active pulmonary tuberculosis. Therefore, we conducted this study to assess the efficacy of Tc-99m ciprofloxacin SPECT for imaging active pulmonary tuberculosis. Twenty-one participants were enrolled in this prospective study. They were divided into two groups according to the clinical and radiological assessment. Group one (Gr. 1) consisted of five normal volunteers and six patients with inactive pulmonary tuberculosis. Group two (Gr. 2) consisted of ten patients with active pulmonary tuberculosis. SPECT was performed 3 h after injecting 555 MBq (15 mCi) of Tc-99m ciprofloxacin. The findings of Tc-99m ciprofloxacin SPECT were interpreted by a nuclear medicine specialist and then the results were analyzed according to the patients' clinical and radiological classifications. The results of Tc-99m ciprofloxacin SPECT were as follows: eight true-positive cases, ten true-negative cases, one false-positive case and two false-negative cases. The sensitivity and specificity was 80.0% and 90.0%, respectively. The positive predictive value was 88.9% and the negative predictive value was 83.3%. Conclusions Tc-99m ciprofloxacin SPECT is feasible for imaging active pulmonary tuberculosis. It is a useful nuclear-imaging method for discriminating between the active and inactive tuberculosis states in patients with a past medical history of pulmonary tuberculosis.

  1. Detection of diabetic foveal edema with biomicroscopy, fluorescein angiography and optical coherence tomography Detecção do edema foveal diabético com biomicroscopia, angiografia fluoresceínica e tomografia de coerência óptica

    Directory of Open Access Journals (Sweden)

    Rosana Zacarias Hannouche

    2008-10-01

    Full Text Available To describe different techniques for the detection of diabetic foveal edema. A retrospective review of the detection of diabetic foveal edema. Noncontact lens biomicroscopy is relatively insensitive in mild foveal thickening apparent on optical coherence tomography. Optical coherence tomography measurements can detect early retinal damage in diabetic retinopathy patients.Descrever diferentes técnicas para detecção do edema foveal diabético. Uma revisão da detecção do edema foveal diabético. Biomicroscopia com lente de não contato é relativamente insensível em edema leve aparente na tomografia de coerência óptica. Tomografia de coerência óptica pode detectar precocemente o dano retiniano inicial em pacientes com retinopatia diabética.

  2. Clinical efficacy of 99mTc-tetrofosmin myocardial scintigraphy

    International Nuclear Information System (INIS)

    Adachi, Itaru; Sugioka, Yasushi; Tanaka, Yasunori

    1993-01-01

    99m Tc-tetrofosmin is a lipophilic, cationic diphosphine which has been developed for myocardial imaging. We examined 9 patients with ischemic heart disease including 3 angina pectoris (AP), 4 old myocardial infarction (OMI), 1 AP with OMI and 1 syndrome X. One patient was examined before and after operation. Three hundred seventy MBq of 99m Tc-tetrofosmin was injected during exercise and 740 MBq at rest. And 74 MBq of 201 Tl myocardial exercise and redistribution scintigraphy was also performed to compare with 99m Tc-tetrofosmin myocardial scintigraphy. SPECT, multiple gated SPECT and anterior planar images were obtained in all cases. We calculated percent wall thickening (%WT) using multiple gated SPECT images. There was a decreased lung uptake in 99m Tc-tetrofosmin planar images compared to 201 Tl myocardial scintigraphy. Liver and Biliary system uptake in 99m Tc-tetrofosmin images was decreased with intake of milk. Segmental comparison of SPECT images showed an agreement in 9/10 of the segment between 201 Tl and 99m Tc-tetrofosmin. We could obtain excellent quality of multiple gated SPECT images in all patients. We could calculate percent wall thickening (%WT) in all patients. We conclude that 99m Tc-tetrofosmin myocardial scintigraphy should provide usefulness for detection of ischemic myocardium as same as 201 Tl myocardial scintigraphy, although the biologic characteristics of two agents were different. These data and excellent quality of multiple gated SPECT images suggest that 99m Tc-tetrofosmin is a new 99m Tc agent for evaluation of patients with ischemic heart disease. (author)

  3. Alternative generators of the 99mTc

    International Nuclear Information System (INIS)

    Khujaev, S.

    2004-01-01

    9 9mTc is the most widely used radionuclide in nuclear medicine. 9 9mTc radionuclide is obtained from a generator, in which 9 9Mo servest as the parent radionuclide. In the generator 9 9mTc and 9 9Mo radionuclides are found in genetic balance and 9 9mTc radionuclide is chemically extracted from the system periodically. Although there already exists many ways and variants of manufacturing 9 9mTc generators, search for new variants of the 9 9Mo → 9 9mTc generator systems continue. An example is the investigations carried out with the support of the IAEA. In these research works, generators based on elution of poly molybdate gels have been developed and evaluated. These generators will be serving as alternative technologies for production of 9 9mTc radionuclide, which use 9 9Mo produced by non-fission means. It is known that in Australia and China more than 30% of 9 9mTc generators are gel-generators. The works of authors are devoted to the problem of searching new perspective materials as a column material that will serve as adsorbent. The main purpose of all the research on alternative technologies is the usage of parent radionuclide 9 9Mo that is obtained from 9 8Mo(n, γ) 9 9Mo reaction instead of as a fission product. Our work examines the possibility of reception of generators 9 9Mo → 9 9mTc using non-fission 9 9Mo that is based on insoluble salts of molybdate

  4. Lymphoscintigraphy in melanoma patients using Tc-99m dextran

    International Nuclear Information System (INIS)

    Marciano, D.; Padgett, H.; Henze, E.; Carlson, C.; Bennett, L.R.

    1984-01-01

    Surgical removal of regional lymph nodes draining the site of a melanoma is a generally practiced procedure. It is often difficult in many cases of truncal melanomas near the midline or near the waistline to determine which group or groups of nodes to remove. Colloidal Au-198, Tc-99m sulfur colloid, and Tc-99m antimony sulfur colloid have all been used and have given useful clinical information. Objections, however, have been raised to the local radiation dose with these compounds. To reduce this problem while obtaining greater information on lymph flow, the authors have studied dextran, a macromolecule commonly used as plasma substitute. Dextran (average mol. wt. 72,000) labeled with Tc-99m has been used to study lymph drainage from the site of truncal melanoma in 29 patients. Serial images in the first hour following intradermal injection clearly demonstrate tracer in efferent lymphatics within 5 to 10 minutes, and brief pooling in the regional lymph nodes between 20 and 60 minutes. When compared with particulate tracers such as micro Tc-99m sulfur colloid, the Tc-99m dextran appears to move much faster through the lymphatics. Overall distribution of the Tc-99m dextran to lymph nodes is very similar to previous findings with micro Tc-99m sulfur colloid. Dextran drainage to more than one group of regional nodes was seen in 12/29 patients as compared with 17/50 patients using micro Tc-99m sulfur colloid. The superior images with Tc-99m dextran appear to make it the agent of choice

  5. Pharmacokinetic model of myocardial 99mTc-sestamibi washout

    International Nuclear Information System (INIS)

    Watanabe, Tsubasa; Monzen, Hajime; Mizowaki, Takashi; Hiraoka, Masahiro; Hara, Masatake

    2013-01-01

    Technetium-99m sestamibi ( 99m Tc-MIBI) scintigraphy has been reported to be a functional imaging tool for in vivo detection of mitochondrial dysfunction in myocardium and multidrug resistance-associated protein expression in tumors. The purpose of this study was to propose a clinically applicable pharmacokinetic model with metabolic equilibrium of 99m Tc-MIBI and to evaluate the accuracy of the model. For this study, eight healthy men received 99m Tc-MIBI scintigraphy. The planar images were obtained at 0.25, 0.5, 1, 2, 3, 4, 5, and 6 h after 99m Tc-MIBI injection. The measured time series 99m Tc-MIBI counts were fitted to our model by nonlinear regression analysis. The predictive performance of the model was determined by comparing the residuals between measured and predicted values. We obtained a good regression by fitting data from 0.25 to 6 h after 99m Tc-MIBI injection, with excellent correlation between measured and predicted 99m Tc-MIBI counts (R 2 =0.9792) and a slope near unity. The 95% confidence interval of the mean prediction error included 0, which means that the prediction was not significantly biased. The precision of the prediction was also excellent. Our model shows good predictive capacity, with favorable bias and accuracy. By comparing the predictive values of this model with measured values, mitochondrial 99m Tc-MIBI washout can be quantified. 99m Tc-MIBI washout rates are reported to be a promising method for evaluating cardiac function in patients with cardiac diseases and P-glycoprotein expression in tumor cells. Therefore, this quantification could be useful for mitochondrial functional imaging, especially in patients with cardiac diseases or tumors. (author)

  6. Tc-99m sucralfate scanning for inflammatory bowel disease

    International Nuclear Information System (INIS)

    Lieberman, L.M.; Becker, S.; Mekhmandarov, S.; Steinmetz, A.

    1987-01-01

    The authors investigated 14 patients with idiopathic inflammatory bowel disease (IBD) by administering Tc-99m sucralfate (TcS) orally and imaging the abdomen 4 and 24 hours after dose. All patients had either barium radiographic studies or colonoscopy before the scan. The scan identified seven of nine patients who had radiologically demonstrated small-bowel lesions and four of five patients with colonic disease. The authors' preliminary experience suggests that TcS maybe a useful procedure to document location and extent of active disease. It provides information about both small and large bowel in one procedure, is noninvasive, easy to perform, and has low radiation absorbed dose

  7. Quantificação computadorizada dos índices de placa e cálculo dentais da imagem digital da superfície vestibular dos dentes de cães

    Directory of Open Access Journals (Sweden)

    Samira L. Abdalla

    2009-08-01

    Full Text Available A doença periodontal é causada pelo acúmulo de placa bacteriana sobre os dentes e estruturas adjacentes. Para sua mensuração têm sido formulados índices que consideram a quantidade e intensidade de placa bacteriana (PB e de cálculo dental (CD existentes na superfície dentária por meio de avaliação visual subjetiva. O presente estudo tem como objetivo avaliar o método de análise computadorizada para medição de área de PB e CD nos dentes de cães através da comparação com a avaliação visual. Foram utilizados 10 cães Beagles, três machos e sete fêmeas, com similares características e mantidos sob o mesmo manejo e dieta alimentar. As avaliações das superfícies vestibulares dos dentes ocorreram antes da profilaxia dentária, que foi realizada sob anestesia geral inalatória, e após sete dias para PB e após 28 dias para CD. A avaliação computadorizada da área de CD demonstrou ser estatisticamente melhor em relação à avaliação visual antes e após a profilaxia; entretanto, não demonstrou diferença significante na avaliação da PB. Concluiu-se que a avaliação computadorizada é vantajosa em relação à visual por conferir maior precisão na obtenção da proporção entre área total do dente e área acometida, mostrando-se estatistticamente superior na quantificação do CD após 28 dias.Periodontal disease is caused by dental plaque accumulation on teeth and adjacent structures. Indices have been formulated for its measurement considering the amount and intensity of dental plaque (DP and dental calculus (C on the surface of teeth through subjective visual evaluation. This study aims at assessing the computerized analysis method for measurement of DP and C areas on the teeth of dogs by comparing it with the visual evaluation in the oral cavity. Ten beagle dogs with similar characteristics and kept under the same management and diet were used. Evaluations of oral cavity occurred before surgical prophylaxis

  8. Synopsis of TC4 Missions and Meteorology

    Science.gov (United States)

    Starr, D.; Pfister, L.; Selkirk, H.; Nguyen, L.

    2007-12-01

    The TC4 (Tropical Composition, Clouds and Climate Coupling) Experiment conducted 26 aircraft sorties on 13 flight days from July 17 to August 8, 2007 (23 days). Quality science observations were also obtained during the transit flights to/from from San Jose, Costa Rica, where the mission was based. On 9 days, coordinated aircraft missions were flown with the NASA ER-2 and DC-8, and with the NASA WB-57 on 3 occasions (and transit flights). The ER-2 served as an A-Train simulator (MODIS, CloudSat, CALIPSO, AIRS/TES, partial AMSR-E) while the WB-57 provided in-situ measurements of upper tropospheric cloud particles, aerosols and trace gases. The DC-8 provided both in-situ and remote sensing measurements, where the latter were focused on Aura validation, and also including a down-looking scanning precipitation radar (TRMM PR simulator). This paper will provide a synopsis of the science observations that were obtained, as regards the clouds and cloud systems sampled, from a meteorological perspective. A diversity of clouds were sampled and the meteorology proved more interesting than expected, at least to this author. Upper tropospheric cirrus outflows were sampled from a number of convective cloud systems including ITCZ-type systems as well as systems close to and affected by land. The low level inflows to these systems were also sampled in some cases (DC-8) and missions were flown to sample stratocumulus clouds over the Pacific Ocean exploiting the unique instrumentation on the DC-8 to add to the knowledge of these clouds which are so important to the Earth radiation budget. Measurements were made in the tropical Tropopause Transition Layer (TTL) by the WB-57. Upper tropospheric clouds and TTL properties and processes were central TC4 objectives. Excellent data were also obtained on the fate of the Saharan Air Layer and its aerosols over the Caribbean and Central America, as well as samples of plumes from volcanoes in Ecuador and Columbia and biogenic emissions over

  9. Solubility study of Tc(Ⅳ) in a granitic water

    International Nuclear Information System (INIS)

    Liu Dejun; Yao Jun; Wang Bo

    2008-01-01

    The deep geological disposal of the high level radioactive wastes is expected to be a safe disposal method in most countries. The long-lived fission product 99 Tc is present in large quantities in nuclear wastes and its chemical behavior in aqueous solution is of considerable interest. Under oxidizing conditions technetium exists as the anionic species TcO 4 - whereas under the reducing conditions, expected to exist in a deep geological repository, it is generally predicted that technetium will be present as TcO 2 -nH 2 O. Hence, the mobility of Tc(Ⅳ) in reducing groundwater may be limited by the solubility of TcO 2 ·nH 2 O under these conditions. Due to this fact it is important to investigate the solubility of TcO 2 ·nH 2 O. The solubility determines the release of radionuclides from waste form and is used as a source term in radionuclide migration analysis in performance assessment of radioactive waste repository. Technetium (Ⅳ) was prepared by reduction of a technetate solution with Sn 2+ . The solubility of Tc(Ⅳ) has been determined in simulated groundwater and redistilled water under aerobic and anaerobic conditions. The effects of pH and CO 3 2- concentration of solution on solubility of Tc(Ⅳ) were studied. The concentration of total technetium and Tc(Ⅳ) species in the solutions were periodically determined by separating the oxidized and reduced technetium species using a solvent extraction procedure and counting the beta activity of the 99 Tc with a liquid scintillation counter. The experimental results show that the rate of oxidation of Tc(Ⅳ) in simulated groundwater and redistilled water is about (1.49-1.86)x10 -9 mol·L -1 d -1 under aerobic conditions, while no Tc(Ⅳ) oxidation was detected in simulated groundwater and redistilled water under anaerobic conditions. Under aerobic or anaerobic conditions the solubility of Tc(Ⅳ) in simulated groundwater and redistilled water is equal on the whole after centrifugation or ultrafiltration. The

  10. Synthesis and evaluation of 99mTc/99Tc-MAG3-biotin conjugates for antibody pretargeting strategies

    International Nuclear Information System (INIS)

    Gog, Frank B. van; Visser, Gerard W.M.; Gowrising, Radjish W.A.; Snow, Gordon B.; Dongen, Guus A.M.S. van

    1998-01-01

    Four 99m Tc-MAG3-biotin conjugates were synthesized to determine their potential use in antibody pretargeting strategies for radioimmunoscintigraphy (RIS). To use these 99m Tc-MAG3-biotin conjugates as model compounds for 186 Re-MAG3-biotin conjugates for radioimmunotherapy (RIT), nanomolar amounts of 99 Tc were added as carrier to 99m Tc. The biotin derivatives used for the preparation of the conjugates - biocytin, biotin hydrazide, biotinyl-piperazine, and biotinyl-diaminosuccinic acid - differed at the site that is regarded to be susceptible to hydrolysis by biotinidase present in human plasma. All four conjugates were produced with high radiochemical purity, were stable in PBS, and demonstrated full binding capacity to streptavidin. The 99m Tc/ 99 Tc-MAG3-labeled biotinyl-piperazine and biotinyl-diaminosuccinic acid conjugates were stable in mouse as well as human plasma, whereas the corresponding biocytin and biotin hydrazide conjugates were rapidly degraded. The biodistribution in nude mice at 30 min after injection was similar for all conjugates, and a rapid blood clearance and high intestinal excretion were both observed. It is concluded that the metabolic routing of a conjugate containing biotin and MAG3 is dominated by these two moieties. For this reason, MAG3-biotin conjugates do not seem suited for pretargeted RIT, for which quantitative and fast renal excretion is a prerequisite to minimize radiation toxicity. However, in a pretargeted RIS approach the 99m Tc-MAG3-biotin conjugates might have potential

  11. Improved brain scan specificity utilizing /sup 99m/Tc-pertechnetate and /sup 99m/Tc(Sn)-diphosphonate

    International Nuclear Information System (INIS)

    Fischer, K.C.; McKusick, K.A.; Pendergrass, H.P.; Potsaid, M.S.

    1975-01-01

    Each of 36 patients was studied with two separate brain scans performed sequentially after the injection of 20 mCi of /sup 99m/Tc-pertechnetate or 20 mCi of /sup 99m/Tc(Sn)-diphosphonate. The resulting scans were qualitatively compared, and lesion-to-nonlesion ratios of activity determined. Diagnoses were established by clinical criteria and were supported in the majority of cases by computerized axial tomography or roentgen angiography or both. Histologic confirmation was available in five cases of tumor and in the single cases of subdural hematoma and cerebral abscess. Of 22 cerebral infarctions, 15 were better demonstrated with /sup 99m/Tc-(Sn)-diphosphonate than with /sup 99m/Tc-pertechnetate. Of the seven remaining cases, three were visualized equally well with each agent, and three were better demonstrated with /sup 99m/Tc-pertechnetate. One was not seen with either agent. Of the 12 tumors, 11 were visualized better with /sup 99m/Tc-pertechnetate than with /sup 99m/Tc(Sn)-diphosphonate while in one case the lesion was seen equally as well with both agents. In no case was a lesion definitely seen with one radio- pharmaceutical and not with the other. These results indicate that this dual method is helpful in differentiating gliomas and metastases from cerebral infarctions. (U.S.)

  12. Comparative study of uptake and washout of 99mTcN(NOEt)2 with 99mTc-MIBI in human cervical carcinoma cell lines

    International Nuclear Information System (INIS)

    Xing Shi'an; Zhang Yongxue; An Rui

    2002-01-01

    Objective: to investigate the cellular kinetics of bis (N-ethoxy-N-ethyl dithiocarbamato) nitrido 99m Tc(V) [ 99m TcN (NOEt) 2 ] in human cervical carcinoma cell line Hela and to compare it with that of 99m Tc hexakis-2- methoxyisobutyl isonitrile ( 99m Tc-MIBI), and hence to define the possible clinical value of 99m TcN(NOEt) 2 in tumor imaging. Methods: Using radionuclide tracer technique, 99m TcN(NOEt) 2 and 99m Tc-MIBI were incubated with human cervical carcinoma cell lines Hela at 37 degree C and at 22 degree C respectively. At several incubation times, the uptake and washout characteristics of the radiotracers in human cervical carcinoma cell line Hela were investigated and compared. Results: The maximum uptake of 99m TcN(NOEt) 2 in Hela was 46.15% and that of 99m Tc-MIBI was 12.6% (P 99m TcN(NOEt) 2 after 5 min incubation in human cervical carcinoma cell line Hela was 65% of the total uptake, while that of 99m Tc-MIBI was 50% of the total uptake (P 99m TcN(NOEt) 2 was retained in the Hela cells at one hour while 56.67% of 99m Tc-MIBI was retained (P 99m Tc-MIBI, the cellular kinetics of 99m TcN(NOEt) 2 was not temperature-dependent (the cellular kinetics is similar at 37 degree C and at 22 degree C, P>0.05). Conclusions: In vitro data suggest that 99m TcN(NOEt) 2 may be a better tracer than 99m Tc-MIBI in tumor imaging and 99m TcN(NOEt) 2 has potential application in clinical use

  13. Tumores intracranianos em pacientes encaminhados para estudos por tomografia de coerência óptica como portadores de glaucoma sem hipertensão ocular: relato de dois casos Intracranial tumors in patients referred for optical coherence tomography examination as glaucoma suspects: case report

    Directory of Open Access Journals (Sweden)

    Laurentino Biccas Neto

    2009-10-01

    Full Text Available A tomografia de coerência óptica (OCT tem se mostrado muito útil na avaliação de pacientes com glaucoma. São relatadas duas pacientes referidas com a suspeita de glaucoma sem hipertensão para avaliação por tomografia de coerência óptica que, na verdade, eram portadoras de tumores intracranianos - um cordoma de clivo no primeiro caso e um craniofaringeoma no segundo. Os achados à tomografia de coerência óptica - diminuição difusa da espessura da camada de fibras nervosas circumdiscais desproporcionalmente acentuada nos setores nasal e temporal - levantaram a suspeita de acometimento na região do quiasma e permitiram o diagnóstico destes importantes tumores intracranianos.Optical coherence tomography (OCT has proved to be a very valuable tool in the assessment of patients with glaucoma. In this report, intracranial tumors were discovered in two glaucoma suspects referred for diagnostic confirmation by OCT - a clivus chordoma and a craniopharyngeoma. Optical coherence tomography findings - marked asymmetrical diffuse attenuation of the peripapillary nerve fiber layer in nasal and temporal sectors - raised concerns about lesions in chiasmatic region and permitted the timely diagnosis of these intraocular tumors.

  14. High Tc superconducting energy storage systems

    Energy Technology Data Exchange (ETDEWEB)

    Werfel, Frank [Adelwitz Technologiezentrum GmbH (ATZ), Arzberg-Adelwitz (Germany)

    2012-07-01

    Electric energy is basic to heat and light our homes, to power our businesses and to transport people and goods. Powerful storage techniques like SMES, Flywheel, Super Capacitor, and Redox - Flow batteries are needed to increase the overall efficiency, stability and quality of electrical grids. High-Tc superconductors (HTS) possess superior physical and technical properties and can contribute in reducing the dissipation and losses in electric machines as motors and generators, in electric grids and transportation. The renewable energy sources as solar, wind energy and biomass will require energy storage systems even more as a key technology. We survey the physics and the technology status of superconducting flywheel energy storage (FESS) and magnetic energy storage systems (SMES) for their potential of large-scale commercialization. We report about a 10 kWh / 250 kW flywheel with magnetic stabilization of the rotor. The progress of HTS conductor science and technological engineering are basic for larger SMES developments. The performance of superconducting storage systems is reviewed and compared. We conclude that a broad range of intensive research and development in energy storage is urgently needed to produce technological options that can allow both climate stabilization and economic development.

  15. Conductus makes high-Tc integrated circuit

    International Nuclear Information System (INIS)

    Anon.

    1991-01-01

    This paper reports that researchers at Conductus have successfully demonstrated what the company says is the world's first integrated circuit containing active devices made from high-temperature superconductors. The circuit is a SQUID magnetometer made from seven layers of material: three layers of yttrium-barium-copper oxide, two layers of insulating material, a seed layer to create grain boundaries for the Josephson junctions, and a layer of silver for making electrical contact to the device. The chip also contains vias, or pathways that make a superconducting contact between the superconducting layers otherwise separated by insulators. Conductus had previously announced the development of a SQUID magnetometer that featured a SQUID sensor and a flux transformer manufactured on separate chips. What makes this achievement important is that the company was able to put both components on the same chip, thus creating a simple integrated circuit on a single chip. This is still a long way from conventional semiconductor technology, with as many as a million components per chip, or even the sophisticated low-Tc superconducting chips made by the Japanese, but the SQUID magnetometer demonstrates all the elements and techniques necessary to build more complex high-temperature superconductor integrated circuits, making this an important first step

  16. Electronic properties of high Tc superconductors

    International Nuclear Information System (INIS)

    Rojo, A.G.

    1989-01-01

    Using analytical and numerical methods, the electronic properties of the copper-oxygen plane in the normal phase of high Tc superconductors are described. Using the slave-boson technique in the saddle point, a theory of the metal insulator transition which generalizes the notions of a Mott insulator to the case of more than a single band for those planes is presented. A phase-diagram is obtained in the parameter space and effective masses, optical gaps and metallization are calculated as a function of the number of carriers. Based on the experimental evidence, the theory permits classification of superconducting compounds as charge transfer insulators in the stoichiometric case. The insulator state is characterized by a non-zero optical gap and a divergent effective mass which corresponds to the breakage of a Fermi-liquid scheme. The results obtained are applicable to metal-transition-oxides whose behaviour has been traditionally controversial and it is concluded that it is necessary to broaden the meaning of a Mott insulator to the case of more than a single band to better understand them. Based on the ideas of group renormalization in a real space, a lattice approximation is presented, which allows: a) To complement the treatment of slave-bosons in phase diagrams and optical gaps; b) Identification of an attraction mechanism between carriers originating from purely repulsive interactions. Numerical calculations in small clusters show the existence of a pairing mechanism showing a superconducting instability from a charge transfer insulator. (Author) [es

  17. Tc-99m leucoscintigraphy in surgical patients

    International Nuclear Information System (INIS)

    Durre-e-Sabih

    1990-01-01

    Leucoscintigraphy with Tc-99m-HMPAO is an important diagnostic modality for localizing of the site of infection. It has distinct advantages over gallium 67 and indium-111 labelled leukocytes, in terms of better image quality, less cell activation and the choice of using Technetium instead of In-111. This study was designed to set up the technique in AEMC, Multan Pakistan, to assess the practicality of using the procedure, and to see if the results offered additional clinical information that could affect patient management in our clinical environment. 27 patients were studied using the technique. There were 17 post-surgical patients, 4 post-partal patients and 6 patients who did no fit into the above categories. An accuracy of 81%, sensitivity of 75% and a specificity of 100 % were achieved. The spectrum of clinical presentation was broad and included post-operative infections, intra-abdominal haematoms, brain abscesses, localized peritonitis, sterile and infected intraperitoneal collections, infected pleural effusions and pyrexia of unknown origin. It was concluded that this technique is practicable in our conditions and gives important clinical information. (author)

  18. Differentiation of malignant and degenerative benign bone disease using Tc-99m Citrate and Tc-99m MDP scintigraphy

    International Nuclear Information System (INIS)

    Jin, J.; Guo, R.; Li, S.-J.; Ren, Y.; Zhang, C.; Zhang, X.

    2007-01-01

    Full text: For the evaluation of bone metastases in patients (pts) with cancer, 99mTcMDP bone scintigraphy is an important tool, but some limitations exist. One of these is the differential diagnosis of malignant and degenerative benign bone disease. The aim of this study was to differentiate them using 99mTcCitrate and 99mTcMDP scintigraphy. Methods: 39 pts (92 lesions) with known malignant or degenerative benign bone disease were studied. 23 pts had malignant bone disease (48 lesions, group 1), the other 16 pts had degenerative benign bone disease (44 lesions, group2), for which the results of 99mTcMDP scintigraphy were positive. In both groups, 99mTcCitrate scintigraphy was performed within a time interval of 2-7 days after 99mTcMDP scintigraphy (555∼740MBq. static, 3hr, planar or SPECT i m a g e s w h e n r e q u i r e d ) . The 99mTccitrate/99mTcMDP lesion-to-background radioisotope uptake ratio (RUR) was calculated for each lesion. Conventional techniques (histopathology, X-ray, CT, MRI and clinical follow up) were considered to be proof of the presence of bone metastases and degenerative benign bone disease. Results: Uptake of 99mTcMDP in the two groups is the same (1.96±0.25 vs. 1.87±0.21; t=1.178, P>0.20), while in 99mTcCitrate image, malignant lesions demonstrated a higher uptake of lesion activity than that of benign degenerative lesions (1.47±0.42 vs. 1.09±0.38; t=2.887, P<0.01). The mean 99mTccitrate/99mTcMDP RUR in the malignant group was significantly higher than the mean in the benign group (0.78±0.21 vs. 0.54±0.19; t=3.646, P<0.001). Conclusions: The preliminary results of the study confirm the usefulness and feasibility of 99mTcCitrate scintigraphy for differentiating malignant from benign degenerative lesions seen as areas of increased activity on 99mTcMDP bone scintigraphy. (author)

  19. TcA, the putative transposase of the C. elegans Tc1 transposon, has an N-terminal DNA binding domain.

    OpenAIRE

    Schukkink, R F; Plasterk, R H

    1990-01-01

    Tc1 is a transposon present in several copies in the genome of all natural isolates of the nematode C.elegans; it is actively transposing in many strains. In those strains Tc1 insertion is the main cause of spontaneous mutations. The transposon contains one large ORF that we call TcA; we assume that the TcA protein is the transposase of Tc1. We expressed TcA in E.coli, purified the protein and showed that it has a strong affinity for DNA (both single stranded and double stranded). A fusion pr...

  20. Preparation and characterization of the tetrabutylammonium salts of the tetrahalooxotechnetates(V), [TcOCl4]- and [TcOBr4]-

    International Nuclear Information System (INIS)

    Preetz, W.; Peters, G.

    1980-01-01

    The treatment of (TBA)TcO 4 with conc. HCl or HBr at room temperature yields (TBA) [TcOCl 4 ] or (TBA) [TcOBr 4 ], which are nearly insoluble in acidic aqueous solutions, but well soluble in organic solvents. The vibrational spectra indicate C 4 sub(v) symmetry for the complex ions. (TBA) [TcOBr 4 ] shows an unusual resonance Raman effect, as the progression of overtones runs with the B 1 TcCl 4 stretching vibration instead of the symmetric A 1 mode. The coupling of B 1 with the first overtone of νTcO gives more intense difference than combination bands. (orig.)

  1. Analysis of Tandem curves by set of cylindrical absorber layers and ionization chamber type pencil for evaluation of HVL in computerized tomography; Análise de curvas Tandem obtidas por meio de conjuntos de capas absorvedoras cilíndricas e câmara de ionização do tipo lápis para avaliação de CSR em Tomografia Computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Fontes, Ladyjane Pereira; Potiens, Maria da Penha Albuquerque, E-mail: lpfontes@ipen.br [Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP), São Paulo, SP (Brazil)

    2017-07-01

    A Tandem system consists of the use of different energy dependent dosimeters, where the ratio of the responses of the calibration curves to energy provides the effective energy of the beam. The efficiency of this system is related to the uncertainties inherent in the dosimeter used and the degree of energy dependence of each set. The greater the slope of the Tandem curve the better will be the identification of values close to HVL making the system useful. In this work, the Tandem system consists of ionization chamber of the pencil type and cylindrical absorber layers of materials with different energetic dependencies, for application in computed tomography. (author)

  2. Discordant results in Tc-99m tetrofosmin and Tc-99m sestamibi parathyroid scintigraphies; Resultados discordantes em cintilografias das paratireoides realizadas com tetrofosmin-99mTc e com sestamibi-99mTc

    Energy Technology Data Exchange (ETDEWEB)

    Duarte, Paulo Schiavom; Domingues, Fernanda C.; Santi Costa, Michele; Brandao, Cynthia; Oliveira, Marco A.C. de; Vieira, Jose G.H. [Fleury - Centro de Medicina Diagnostica, Sao Paulo, SP (Brazil)]. E-mail: paulo.duarte@fleury.com.br

    2007-10-15

    Parathyroid scintigraphies have been used to detect pathological parathyroid glands either before as well as after the parathyroid resection surgery in patients with hyperparathyroidism. One of the most utilized techniques to perform the studies is the double-phase images with Tc-99m sestamibi, which has been shown to be very accurate in the localization of enlarged parathyroid glands. Similar to Tc-99m sestamibi, Tc-99m tetrofosmin is a radiopharmaceutical initially developed to perform myocardial perfusion study that has been used to perform parathyroid scintigraphies. Although most of the papers suggest that the overall sensitivities of both radiopharmaceuticals are similar, there are some papers questioning the accuracy of Tc-99m tetrofosmin to detect abnormal parathyroid glands. In the present article, we report a case with discordant results by both methods. (author)

  3. Evaluation of leucocytes labelling technique with 99m Tc - HMPAO

    International Nuclear Information System (INIS)

    Moraes, D.W.; Marinho, N.S.; Rezende, M.E.X.; Buchpiguel, C.A.; Rockmann, T.M.B.

    1992-01-01

    An evaluation of the leukocytes labelling technique with HMPAO- 99m Tc, using low volume of blood and keeping the labelling efficiency and cellular viability in compatible levels with those preconized by the literature is presented. (C.G.C.)

  4. Preparation of 99 sup(m)Tc labeled fibrinogen

    International Nuclear Information System (INIS)

    Almeida, M.A.T.M. de; Silva, C.P.G. da.

    1984-01-01

    A simple method for the preparation of 99 sup(m) TC labelled Fibrinogen using stannous chloride as reducing agent of 99 sup(m) TcO- 4 ion is presented. A sample of 20 mg of Fibrinogen is dissolved in 2 ml of buffer carbonate (pH=8) and 0.3 ml stannous chloride 0.2% is added. A sterile solution of sodium pertechnetate 99 sup(m) Tc eluted from a Mo-Tc generator is immediately added. The mixture rests for 30 minutes and after this period, the obtained yield is about 70%. The lyophilized kits also presented a yield of 70%, being therefore suitable for medical applications. (Author) [pt

  5. Production of 99Tc generators with automatic elution

    International Nuclear Information System (INIS)

    Mengatti, J.; Yanagawa, S.T.I.; Mazzarro, E.; Gasiglia, H.T.; Rela, P.R.; Silva, C.P.G. da; Pereira, N.P.S. de.

    1983-10-01

    The improvements performed on the routine production of sup(99m) Tc-generators at the Instituto de Pesquisas Energeticas e Nucleares-CNEN/SP, are described. The old model generators (manual elution of sup(99m) Tc) were substituted by automatically eluted generators (Vacuum system). The alumina column, elution system and acessories were modified; the elution time was reduced from 60 to 20-30 seconds. The new generators give 80-90% elution yields using six mililiters of sodium chloride 0,9% as sup(99m) Tc eluant instead of the 10 mililiters necessary to eluate the old generators. So, the radioactive concentrations are now 70% higher. The radioactive, radiochemical, chemical and microbiological criteria were examinated for sup(99m) Tc solutions. Like old generators, automatic generators were considered safe for medical purpose. (Author) [pt

  6. Sup(99m)Tc compounds for diagnostic purposes

    International Nuclear Information System (INIS)

    Cifka, J.; Budsky, F.

    1980-01-01

    The applications of sup(99m)Tc in nuclear medicine are discussed, such as sodium pertechnetate in thyroid and brain scintigraphy, complex compounds in lungs and liver diao.nosis. Technetium generators are classified according to the method of separating sup(99m)Tc from 99 Mo. Adsorption generators are used, molybdate-99 is adsorbed on an Al 2 O 3 -packed column while pertechnetate-99m is eluted with 0.9% NaCl solution. Also used is continuous pertechnetate-99m extraction with methyl ethyl ketone from 0.5 M potassium molybdate and 2.5 M of potassium carbonate. The manufacture is described of kits for sup(99m)Tc radiopharmaceuticals preparation, eg., Diagos I, a gluconate complex, a lyophilisate for sup(99m)Tc-sodium pyrophosphate injections, a diagnostic kit for lung scintiscanning. (H.S.)

  7. Five-fold way to new high Tc superconductors

    Indian Academy of Sciences (India)

    shook the foundation of phonon-mediated pairing mechanism. In fact, certain in- ...... of superconducting Tc in doped cuprates below optimal doping. ...... ductor transition, the following are the minimal requirements for superconductivity:.

  8. Sequential hepatobiliary scintigraphy of the patients with constitutional jaundice, ICG excretory defect disease and hepatocellular carcinoma with 99mTc-PI, 99mTc-HIDA and 99mTc-EHIDA

    International Nuclear Information System (INIS)

    Mitani, Tsuyoshi

    1987-01-01

    Sequential 2 min scintiphotos were obtained with a scintilation camera after intravenous injection of 3 mCi of 99m Tc-HIDA or 99m Tc-PI. Digital matrix images were simultaneously recorded with computer. Sequential samples for the blood clearance of 99m Tc-HIDA or 99m Tc-PI were obtained for 120 min following injection to the patient of constitutional hyperbilirubinemia and ICG excretory defect disease. In Dubin-Johnson syndrome, the hepatic uptake of 99m Tc-HIDA was faster or normal but the excretion was extremely slower than in normal cases. Both hepatic uptake and excretion of 99m Tc-PI were almost normal. In Rotor's disease, hepatic uptake of 99m Tc-HIDA or 99m Tc-PI was very poor, showing almost no hepatic images in all time. In Gilbert's disease and ICG excretory defect disease, hepatic uptake and excretion of 99m Tc-HIDA or 99m Tc-PI were within normal limit. From these results, Dubin-Johnson syndrome, Rotor's disease and Gilbert's disease show the different patterns between hepatic uptake and excretion of 99m Tc-HIDA and 99m Tc-PI hepatobiliary scintigraphy and these patterns contribute to the differential diagnosis of constitutional jaundice. The usefulness of hepatobiliary imaging with 99m Tc-EHIDA in diagnosis of hepatocellular carcinoma was studied in 15 patients with histologically verified HCC. In 15 patients, 3 patients (20 %) showed increased radioactivity with 99m Tc-EHIDA image, where liver scan with 99m Tc-Sn colloid showed filling defect. These results indicate that use of 99m Tc-EHIDA scan and 67 Ga-citrate imaging is useful for positive visualization of HCC. (author)

  9. 78 FR 40824 - Proposed Collection; Comment Request for Form 8038-TC

    Science.gov (United States)

    2013-07-08

    ... 8038-TC AGENCY: Internal Revenue Service (IRS), Treasury. ACTION: Notice and request for comments... Form 8038-TC, Information Return for Tax Credit Bonds. DATES: Written comments should be received on or...-TC. Abstract: Form 8038-TC will be used by issuers of qualified tax- exempt credit bonds, including...

  10. 77 FR 54908 - TC Offshore, LLC; Notice Establishing Deadline for Comments

    Science.gov (United States)

    2012-09-06

    ... DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. RP12-908-000] TC Offshore, LLC; Notice Establishing Deadline for Comments On August 29, 2012, TC Offshore, LLC (TC Offshore... is hereby given that participants in the captioned proceedings may file comments to TC Offshsore's...

  11. 75 FR 5855 - Proposed Collection; Comment Request for Form 8038-TC

    Science.gov (United States)

    2010-02-04

    ... 8038-TC AGENCY: Internal Revenue Service (IRS), Treasury. ACTION: Notice and request for comments... comments concerning Form 8038-TC, Information Return for Tax Credit Bonds. DATES: Written comments should...: Form 8038-TC. Abstract: Form 8038-TC will be used by issuers of qualified tax- exempt credit bonds...

  12. The study of x-ray photo-electron spectroscopy of 99mTc-RBC

    International Nuclear Information System (INIS)

    Song Chunyi

    1994-01-01

    99m Tc-RBC are widely used as visualization agents for a blood pool. In this research 99m Tc-RBC was prepared by in vivo labeling. The chemical state and changes of 99m Tc atoms in 99m Tc-RBC was determined by x-ray photo-electron spectroscopy (XPS). The stability of 99m Tc-RBC is best shown by the determination of XPS at one hour or at two hours after labeling. There are two ways of coordination of bonding of RBC and 99m Tc: One is the coordination of 99m Tc with the oxygen atom which carries a negative charge of the carboxyl radical on the polypeptide bond, the other is the coordination of 99m Tc with a sulfur atom which caries the negative charge of cysteine. From the E b value of 99m Tc-RBC 99m Tc 3d5/2, it can be inferred that 99m Tc of 99m Tc-RBC is less than a trivalent. At the same time, the results of the determination by XPS with the compounds containing 99 TcO 4 - , 99 Tc(V), 99 Tc(IV) and 99 Tc(III) show that the chemical shift is lowered as the reduction state is lowered. Experimental results coincide with theoretical inferences

  13. Availability of {sup 99}Tc in undisturbed soil cores

    Energy Technology Data Exchange (ETDEWEB)

    Denys, Sebastien; Echevarria, Guillaume E-mail: guillaume.echevarria@ensaia.inpl-nancy.fr; Florentin, Louis; Leclerc-Cessac, Elisabeth; Morel, Jean-Louis

    2003-07-01

    Models for safety assessment of radioactive waste repositories need accurate values of the soil-to-plant transfer of radionuclides. In oxidizing environments, {sup 99}Tc is expected to occur as pertechnetate ({sup 99}TcO{sub 4}{sup -}). Due to its high mobility, leaching of this element in the field might be important, potentially affecting the reliability of estimated transfer parameters of {sup 99}Tc as measured in closed experimental systems such as hydroponics or pot experiments. The aim of this experiment was to measure the leaching of {sup 99}Tc in undisturbed irrigated soil cores under cultivation as well as plant uptake and to study the possible competition between the two transfer pathways. Undisturbed soil cores (50x50 cm) were sampled from a Rendzic Leptosol (R), a colluvial Fluvic Cambisol (F) and a Dystric Cambisol (D) using PVC tubes (three cores sampled per soil type). Each core was equipped with a leachate collector at the bottom, allowing the monitoring of {sup 99}Tc leaching through the cores. Cores were placed in a greenhouse and maize (Zea mays L., cv. DEA, Pioneer[reg]) was sown. After 135 d, maize was harvested and radioactivity determined in both plant and water samples. Results showed that during the growing period, leaching of {sup 99}Tc was limited, due to the high evapotranspiration rate of maize. After harvest, leaching of {sup 99}Tc went on because of the absence of evapotranspiration. Effective uptake (EU) of {sup 99}Tc in leaves and grains was calculated. EU reached 70% of the input in the leaves and was not significantly different among soils. These results confirmed those obtained from pot experiments, even though leaching was allowed to occur in close-to-reality hydraulical conditions. As a consequence, it was concluded that pot experiments are an adequate surrogate for more complex 'close-to-reality' experimental systems for measuring transfer factors.

  14. Tc99m glucoheptonate in detection of lung tumors

    International Nuclear Information System (INIS)

    Pfeiff, D.N.E.; Nascimento, C.B.L.; Riesgo, A.; Ferreira, E.D.; Kwiatowski, A.; Bornemann, C.

    1989-01-01

    The authors intended, with this study, the use and the efficacy of pulmonary scintigraphy with GHA Tc99 as auxiliary method in the diagnosis of lung tumors. Fifty-five patients were studied clinically and radiologically and afterwards with GHA Tc99 pulmonary scintigraphy. The data were confronted with pathologic findings. In thirty-nine of this patients the isotope were captivate in the place of the tumour. (author) [pt

  15. Availability of 99Tc in undisturbed soil cores

    International Nuclear Information System (INIS)

    Denys, Sebastien; Echevarria, Guillaume; Florentin, Louis; Leclerc-Cessac, Elisabeth; Morel, Jean-Louis

    2003-01-01

    Models for safety assessment of radioactive waste repositories need accurate values of the soil-to-plant transfer of radionuclides. In oxidizing environments, 99 Tc is expected to occur as pertechnetate ( 99 TcO 4 - ). Due to its high mobility, leaching of this element in the field might be important, potentially affecting the reliability of estimated transfer parameters of 99 Tc as measured in closed experimental systems such as hydroponics or pot experiments. The aim of this experiment was to measure the leaching of 99 Tc in undisturbed irrigated soil cores under cultivation as well as plant uptake and to study the possible competition between the two transfer pathways. Undisturbed soil cores (50x50 cm) were sampled from a Rendzic Leptosol (R), a colluvial Fluvic Cambisol (F) and a Dystric Cambisol (D) using PVC tubes (three cores sampled per soil type). Each core was equipped with a leachate collector at the bottom, allowing the monitoring of 99 Tc leaching through the cores. Cores were placed in a greenhouse and maize (Zea mays L., cv. DEA, Pioneer[reg]) was sown. After 135 d, maize was harvested and radioactivity determined in both plant and water samples. Results showed that during the growing period, leaching of 99 Tc was limited, due to the high evapotranspiration rate of maize. After harvest, leaching of 99 Tc went on because of the absence of evapotranspiration. Effective uptake (EU) of 99 Tc in leaves and grains was calculated. EU reached 70% of the input in the leaves and was not significantly different among soils. These results confirmed those obtained from pot experiments, even though leaching was allowed to occur in close-to-reality hydraulical conditions. As a consequence, it was concluded that pot experiments are an adequate surrogate for more complex 'close-to-reality' experimental systems for measuring transfer factors

  16. Study on Formulating Policy and Strategies for IAEA TC Program

    International Nuclear Information System (INIS)

    Min, B. J.; Lee, M. K.; Shin, J. Y.

    2010-10-01

    The objectives of this study is to provide recommendations for formulating adequate policy and strategies for IAEA-TC programme as being of a donor Member State and to guide directions to facing the challenges of changing the status from IAEA-TC recipient to donor country. In addition, this study gives recommendations and feedbacks to the IAEA-TC programmer: how it has contributed to nation's nuclear technology development in the past on one hand and how the country has contributed to it on the other. Besides, this study also conducted to identify the following impacts expected: termination of on-going National TC projects, discontinuation of TC-based technical advices, sponsored fellowship and scientific visits for capacity building opportunities, and limitation in participations of various regional projects due to termination of IAEA financial support. In terms of financial aspect, this study has also performed to assess the nation's annual financial contribution (Technical Cooperation (TC) Fund: 1,67 million dollars in 2008) by comparing the experiences of other OECD countries cases. In conclusion, it is expected that the results of this study will contribute to develop appropriate measures in order to maximize the benefits for future national nuclear technology development and in addition, to explore the possibilities to extend the nuclear technology export market potentials

  17. Liver scanning with sup(99m)Tc-phytate

    Energy Technology Data Exchange (ETDEWEB)

    Kubo, A; Isobe, Y; Kobayashi, T; (Keio Univ., Tokyo (Japan). School of Medicine); Kinoshita, Fumio; Shibata, Masayoshi

    1975-03-01

    /sup 198/Au-colloid has been widely used for liver scanning in Japan but it is not the best scanning agent because of the large exposure dose to the patient. The authors performed a few basic experiments with sup(99m)Tc-phytate, the preparation of which is very easy. The labeling efficiency was found to be 97.5% immediately after preparation and it remained fairly stable for a period of time. As a result, the compound can be used up to 6 hours after preparation without fear of chemical instability. Liver scanning with sup(99m)Tc-phytate was done on 116 patients and was compared with /sup 198/Au-colloid liver-scanning. Scans made with sup(99m)Tc were found to be superior to those made with /sup 198/Au in the resolution of surface defects in the liver, while at increasing depths the resolution with sup(99m)Tc dropped rapidly, apparently due to absorption of its relatively low energy photon. This indicates the importance of taking multidirectional views. The degrees of splenic concentration of sup(99m)Tc-phytate were fairly close to those of /sup 198/Au-colloid. Therefore, liver scanning with sup(99m)Tc-phytate is useful in the diagnostic evaluation of diffuse parenchymal liver disease.

  18. 99mTc-Dextran-70: preparation and quality control

    International Nuclear Information System (INIS)

    Herrerias, Rosana; Muramoto, Emiko; Hamada, Elena S.; Barboza, Marycel F. de; Silva, Constancia P.G. da

    1997-01-01

    Dextran-70 labelled with 99m Tc is used for lymphocintigraphy in Nuclear Medicine. The aims of this work were: the lyophilized kit formulation; the radiochemical quality control determination and the biodistribution studies in Wistar rats. Each lyophilized vial contains: 50 mg Dextran-70 (Sigma); 750 μg Sn Cl 2 . 2 H 2 O, pH = 4.0. For the radiochemical determination the following parameters were assayed: Chromatography systems (Whatman 3MM, TLC-SG (Silica-gel) e TLC-A1 (aluminium); the 99m Tc activities (37, 111 and 1850 MBq); the 99m Tc volumes (1,3,5 and 8 mL) and the stability after the lyophilization process (1, 3, 6, 12 and 24 months). The Whatman 3MM chromatography system using acetone as solvent presented a purity yield of 99.88; 99.70; 99.00 and 98.92% using 1, 3, 5 and 8 mL of 99m Tc, respectively. The yield of labelling showed 99.80 % of radiochemical purity using 1850 MBq of 99m Tc, after 24 months. The biological studies were performed in Wistar rats, average weight 250g, after intravenous administration of 99m Tc-Dextran-70 (2.96 MBq). A slow blood decrease with high hepatic uptake was mesured. The high kidney uptake observed, during the experiment, was due the experiment, was due the fact that the animals were kept under anaesthesic effect. (author). 4 refs., 2 figs., 4 tabs

  19. Liver scanning with sup(99m)Tc-phytate

    International Nuclear Information System (INIS)

    Kubo, Atsushi; Isobe, Yoshinori; Kobayashi, Takeshi; Kinoshita, Fumio; Shibata, Masayoshi.

    1975-01-01

    198 Au-colloid has been widely used for liver scanning in Japan but it is not the best scanning agent because of the large exposure dose to the patient. The authors performed a few basic experiments with sup(99m)Tc-phytate, the preparation of which is very easy. The labeling efficiency was found to be 97.5% immediately after preparation and it remained fairly stable for a period of time. As a result, the compound can be used up to 6 hours after preparation without fear of chemical instability. Liver scanning with sup(99m)Tc-phytate was done on 116 patients and was compared with 198 Au-colloid liver-scanning. Scans made with sup(99m)Tc were found to be superior to those made with 198 Au in the resolution of surface defects in the liver, while at increasing depths the resolution with sup(99m)Tc dropped rapidly, apparently due to absorption of its relatively low energy photon. This indicates the importance of taking multidirectional views. The degrees of splenic concentration of sup(99m)Tc-phytate were fairly close to those of 198 Au-colloid. Therefore, liver scanning with sup(99m)Tc-phytate is useful in the diagnostic evaluation of diffuse parenchymal liver disease. (auth.)

  20. Chemical form of tumor-tropic 99mTc-DL-homocysteine

    International Nuclear Information System (INIS)

    Takeda, A.; Okada, S.

    1989-01-01

    Analyses of the chemical forms of 99m Tc-complexes provide important information for the development of a new tumor-tropic 99m Tc-labeled radiopharmaceutical. We attempted to determine the chemical form of 99m Tc-DL-homocysteine ( 99m Tc-Hcy) which was previously reported to be tumor-tropic. By analyzing the functional residues of Hcy in the 99m Tc-Hcy molecule, it was estimated that the sulfhydryl and amino residues participated in the chelate formation. Gel filtration analysis of 99m Tc-Hcy indicated that its molecular size was bigger than that of 99m Tc-penicillamine monomer. The analysis also indicated that 99m Tc-Hcy complex seemed to be a relatively small oligomer. Although an uncertainty remains on the valency of Tc in 99m Tc-Hcy molecule and the accurate molecular size of this complex, its putative chemical form is described. (author)

  1. Preparation of glucoheptonate - sup(99m) Tc using stannous ascorbate as reducing agent for TcO-4 ion

    International Nuclear Information System (INIS)

    Barboza, M.R.F.F. de; Silva, C.P.G. da.

    1983-12-01

    A preparation procedure of stannous ascorbate in lyophilized form is presented. This reducing agent was employed for the preparation of kits of calcium glucoheptonate (GHA) to be labelled with sup(99m) Tc for use in kidney scintigraphy. Comparative studies between kits prepared with stannous ascorbate and those prepared with stannous chloride as reducing agent were made. The labelling yield during 18 hours after the addition of sup(99m) TcO - 4 was higher when stannous ascorbate was used. The stability of kits of calcium glucoheptonate - sup(99m) Tc containing stannous ascorbate was studied during five months after its preparation in the lyophilized form. On the fifth month the labelling yield of GHA - sup(99m) Tc was 89-95%, being therefore suitable for kidney scintigraphy. (Author) [pt

  2. Kinetic study on ligand exchange reaction between ethylenedicysteine and 99mTc- glucoheptonate (99mTc-GH)

    International Nuclear Information System (INIS)

    Wu, C.Y.; Ji, S.R.; Lu, C.X.; Ding, S.Y.; Chen, Z.P.; Lin, X.T.

    2002-01-01

    Aim: 99m Tc-L,L-ethylenedicysteine( 99m Tc-EC)is a new type of renal imaging agent. It can be labeled very easily and efficiently at room temperature through direct labeling at pH 12. The need for direct labeling at pH 12 does not compromise the simplicity and ease of preparation of 99m Tc-EC and its practical usefulness in daily routine. On the basis of the labeling experiments, we developed a ligand exchange labeling method, in which the labeling EC with 99m Tc can be performed at pH 8. In order to provide a theoretic basis, a detailed kinetic study of ligand exchange reaction between 99m Tc- glucoheptonate( 99m Tc-GH) and EC was carried out. Materials and Methods: 99m Tc-EC is prepared as follows: 99m Tc-GH + EC → 99m Tc-EC + GH, labeling can be easily performed by adding 99m TcO 4 - (2∼6ml generator elute) to glucoheptonate solution containing SnCl 2 .2H 2 O solution to form 99m Tc-GH, then freshly prepared 99m Tc-GH is transferred to the aqueous solution of different concentrations of EC at different pH value, after being shaken, 99m Tc-EC was formed. Radiolabeling yield(RLY) and radiochemical purity(RCP) of 99m Tc-GH and 99m Tc-EC were measured by Xinhua No.1 paper with developing system of Me 2 CO/H 2 O/con.NH 3 .H 2 O=9/3/1(V/V). 99m Tc-GH(RCP must be over 98%, 80ul, 3.6∼7.4MBq) was added to 1ml of 0.5mol/L phosphate buffer(pH 12) containing different amount of EC(150, 75, 50 and 15ug), the sample was taken out at different time intervals and RCP was determined. The solution of EC(30ul, 5g/L) was added to 1ml of 0.5mol/L phosphate buffer at different pH value(pH11, 10, 9, 8, 7), after completely vortexed, 99m Tc-GH(RCP must be over 98%, 80ul, 3.6∼7.4MBq) was then added, the sample was taken out and RCP was determined as above. The rate constant(k) of ligand exchange reaction at different concentrations of EC and different reaction pH values were calculated out by integrating. Plot ln[1/(1-RLY)] vs t(time) showed a liner relationship, and the rate

  3. Correlation between differential renal uptake of 99mTc-MAG3 and 99mTc-DMSA

    International Nuclear Information System (INIS)

    Obaldo, J.M.; Gruenwald, F.; Menzel, C.; Biersack, H.J.

    1994-01-01

    We reviewed the quantitative indices obtained from sequential 99m Tc-MAG3 and 99m Tc-DMSA imaging studies performed in 134 patients with a variety of renal disorders in order to determine the correlation between the measured differential renal function using these two agents. Overall correlation was high with r=.86 and the derived regression equation was R.F. DMSA =8.2+0.84 (R.F. MAG3 ), where F.F. is the relative function. Highly divergent values for differential function were obtained however in some subjects. Patients with renal obstructive disorders had a correlation coefficient of.81 which was lower than those with nonobstructive pathologies (r=.95). Although relative kidney function measured using 99m Tc-MAG3 and 99m Tc-DMSA correlate significantly, certain patients such as those with renal obstruction may necessitate quantitation using different renal parameters. (orig.) [de

  4. Scintigraphic findings on 99mTc-MDP, 99mTc-sestamibi and 99mTc-HMPAO images in Gaucher's disease

    International Nuclear Information System (INIS)

    Mariani, G.; Molea, N.; La Civita, L.; Porciello, G.; Lazzeri, E.; Ferri, C.

    1996-01-01

    We report here on the use of the lipophilic cationic complex technetium-99m sestamibi ( 99m Tc-MIBI), employed as an indicator of increased cellular density and metabolic activity, to evaluate Gaucher cell infiltrates in the bone marrow; 99m Tc-hexametazime ( 99m Tc-HMPAO) was also employed, as a pure indicator of lipidic infiltration in the bone marrow. A 67-year-old patient with known type 1 Gaucher's disease presented with a painful left hip and knee and difficulty in gait subsequent to traumatic fracture of the left femoral neck that had required implant of a fixation screw-plaque. Bone scan with 99m Tc-methylene diphosphonate revealed reduced uptake at the distal metaphyseal-epiphyseal femoral region. In addition, whole-body maps and spot-view acquisitions of the thighs and legs were recorded at both 30 min and 2.5 h after the injection of 99m Tc-MIBI: the scintigraphic pattern clearly showed increased uptake at several sites involved by Gaucher deposits in the bone marrow (both knees, with variable intensity in different areas), matching the bone changes detected by conventional x-ray. The target to non-target ratios slowly decreased with time, from an average value of 2.25 in the early scan to an average value of 2 in the delayed scan. The lipid-soluble agent 99m Tc-HMPAO exhibited a superimposable scintigraphic pattern of accumulation at the involved sites, though with lower target to non-target ratios (1.27-1.48). The results obtained in this patient suggest a potential role of 99m Tc-MIBI in the scintigraphic evaluation of Gaucher's lipid deposits in the bone marrow. If the results are confirmed in other patients, this radiopharmaceutical would offer clear advantages over 133 Xe because of its wider availability and greater practicality (i.v. administration of 99m Tc-MIBI versus inhalation of 133 Xe, and use of a single gamma camera instead of two as with 133 Xe). (orig.). With 3 figs

  5. Comparison of carrier-added [99mTc] EDTMP and carrier-free preparations of [99mTc] EDTMP and [99mTc] DPD

    International Nuclear Information System (INIS)

    Krcal, A.; Kletter, K.; Dudczak, R.; Pirich, C.; Mitterhauser, M.

    2002-01-01

    Full text: High uptake of bone-seeking radiopharmaceuticals in malignant bone lesions is a prerequisite for adequate bone scanning. Visual image analysis is impaired due to high soft-tissue activity with currently available [ 99m Tc]-EDTMP-kits. This study aimed to compare carrier-added [ 99m Tc]-EDTMP with carrier-free [ 99m Tc]-EDTMP and [ 99m Tc]-DPD preparations in clinical routine. 15 μg and 150 μg perrhenic acid respectively were added to [ 99m Tc]-pertechnetate (>6 GBq in 3 ml phys. saline). The solution was then transferred into a vial, containing 1 mg of EDTMP, 3.6 mg stannous(II)chloride and 10 mg ascorbic acid under inert conditions. Under vigorous stirring the reaction mixture was heated to 45 o C for 10 min. After cooling down to room temperature the labelling mixture was sterile filtrated (millipore 0.22 μm). Quality control was performed using radio-ITLC (Whatman SG; acetone or ethanol: R f perrhenate/pertechnetate 0.87, colloid/product 0.05; phys. saline: R f colloid 0.00, perrhenate/pertechnetate and product 0.9) allowing rapid and efficient assessment of the product. Carrier free [ 99m Tc]-EDTMP and [ 99m Tc]-DPD were prepared according to instructions of the manufacturer. Clinical studies were performed in 29 patients according to a routine bone scanning protocol by injecting 700-800 MBq of the respective tracer and whole body imaging 3 h thereafter. Radiochemical purity and radiochemical yield relied on various parameters such as concentration of carrier and reducing agent and reaction conditions (pH, reaction time, temperature). Means of the labelling yield were 22 % for the preparation using 150 μg of carrier (5 preparations), 80 % for the preparation using 15 μpg of carrier (10 preparations) and 91 % for the carrier free products (5 preparations). Radiochemical purity was >96 % in all experiments. Colloid was formed in very low amounts, and was completely removed by sterile filtration. In clinical studies quantitative analysis

  6. Study of the effect of the variation of automatic exposure control in computed tomography; Estudio del efecto de la variacion del control automatico de exposicion en tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Nersissian, D. Y.; Capeleti, F. F.; Furquin, T. A. C.; Melo, C. S.

    2011-07-01

    Teams computed tomography (CT) contain the current automatic control of exposure (CAE) which vary from the current X-ray tube in clinical protocols and deliver lower doses than those with fixed current. Alone is not enough control of dose, you need an acceptable image quality ensuring an accurate diagnosis. The TC regulate the flow of two ways: by considering the thickness of the patient and the attenuation by different tissues that intercept the x-ray Besides the advantage, there is the responsibility of proper use of different CAE systems, which require particular knowledge of each manufacturer of the CT.

  7. The scintigraphy of sacroiliac joints. A comparison of 99mTc-DPD and 99mTc-MDP

    International Nuclear Information System (INIS)

    Lantto, T.

    1990-01-01

    The accumulation of 99m Tc-methylene diphosphonate ( 99m Tc-MDP) and 99m Tc-dicarboxypropane diphosphonate ( 99m Tc-DPD) in sacroiliac (si) joints was evaluated as a function of imaging time in 22 control patients and 5 patients with sacroiliitis. The controls were injected with either 99m Tc-DPD or 99m Tc-MDP (12 and 10 patients, respectively) and the patients with sacroiliitis with both agents within 5 days. Both the anterior and posterior views of the si joints were taken. The sacroiliac joint-to-sacrum (SI/S) ratio was calculated with the region of interest method. No statistically significant differences between these bone-seeking agents were found in the SI/S ratios of the control or the diseased patients. A clear overlap of indices (mean±SD) was found between the control patients and the patients with sacroiliitis. When the inflamed si joint was divided into three small adjacent areas and the SI/S ratios calculated for these areas, a statistically significant (P 99m Tc-DPD and in most patients injected with 99m Tc-MDP. In the posterior views, the significance was less marked. In every case, the inflamed part of the si joint was visible in the anterior views. The background subtraction had the greatest effect on the SI/S ratio of anterior images, but in the posterior views no significance was found. The low specificity of sacroiliac joint imaging must be taken into consideration when the results are interpreted. (orig.)

  8. Comparative measurement of sup(99m)Tc-thyroid-uptake (TcTU) using two different methods of data analysis

    International Nuclear Information System (INIS)

    Hotze, L.A.; Schmitz, R.

    1982-01-01

    A new program for automatic measurement of TcTU was developed and compared with a standard interactive method of data analysis. The new program fullfils the requirements for correct calculation of TcTU. The advantages are: reduced working load for the technician and a diminished frequency of erroneous results by improving automatisation of data handling and procedure of activity measurement as well as detailed informative dialogue with the computer without any need for special knowledge of data processing. (orig.) [de

  9. Retinal thickness assessed by optical coherence tomography (OCT in pseudophakic macular edema Espessura retiniana medida pela tomografia de coerência óptica (OCT no edema macular do pseudofácico

    Directory of Open Access Journals (Sweden)

    Maria Teresa Brizzi Chizzoti Bonanomi

    2006-08-01

    Full Text Available PURPOSE: To evaluate the usefulness of the optical coherence tomography (OCT retinal map in angiographic pseudophakic macular edema (ACME. METHODS: This is a prospective analysis of a group of 36 pseudophakic eyes at the fifth postoperative week, submitted to optical coherence tomography 2 macular map and fluorescein angiography on the same day and, a control group of twenty-two 20/20 vision eyes with a minimum 6-month postoperative period, submitted to optical coherence tomography 2 macular map only. Exclusion criteria were diabetes, any macular pathology and unreadable optical coherence tomography or angiogram. The angiograms were divided into three groups according to the edema intensity: Group I: level 0 (absence of angiographic pseudophakic macular edema; group II: levels 1 and 2 (incomplete and complete perifoveal angiographic pseudophakic macular edema respectively and group III: levels 3 and 4 (up to one disc diameter and greater than one disc diameter angiographic pseudophakic macular edema area respectively. The nine zones of the optical coherence tomography macular map were compared between the control and the three subgroups of the study group and, between group I and groups II and III. RESULTS: Among the 36 eyes, 23 (64% were classified as group I, 10 (28% as group II and three (8% as group III. The mean thickness of the fovea zone was 185±15 µm for the control group, 189±24 µm for group I, 213±33 µm for group II and 455±38 µm for group III. Significant differences: between group III and the control or group I for all zones (pOBJETIVO: Medir a espessura retiniana pela tomografia de coerência óptica (OCT no edema macular angiográfico do pseudofácico (ACME. MÉTODOS: Trabalho prospectivo composto de um grupo de estudo com 36 olhos pseudofácicos, entre a 4ª e a 6ª semana de pós-operatório, submetidos ao mapa macular com a tomografia de coerência óptica 2 e à angiofluoresceinografia no mesmo dia e, um grupo controle

  10. 99mTc-ECD and 99mTc-HM-PAO SPECT in five patients with MELAS

    International Nuclear Information System (INIS)

    Katagiri, Shinako; Nishimaki, Hiroshi; Kitano, Masashi; Horiike, Shigeharu; Kan, Shinichi; Ishii, Katsumi; Matsubayashi, Takashi; Sakai, Fumihiko

    1998-01-01

    Cerebral perfusion was studied in five patients with mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes syndrome (MELAS), using single photon emission computed tomography (SPECT) with 99m Tc-ethyl cysteinate dimer ( 99m Tc-ECD) or 99m Tc-hexamethyl propyleneamine oxime ( 99m Tc-HM-PAO). In four cases, regional cerebral blood flow (rCBF) was evaluated by the method reported by Mastuda et al. Immediately after the stroke-like episodes, accumulation of the tracer was relatively increased in the temporooccipital lobe, and also increased rCBF was shown in the same area. However, the region showed decreased radioactivity at the chronic stage, and rCBF decreased also. These findings are consistent with positron emission tomography (PET) at the acute stage and autopsy. 99m Tc-ECD SPECT and 99m Tc-HM-PAO SPECT may be useful in the diagnosis and assessment of the progress of the MELAS. (author)

  11. Novel Tc-99m radiotracers for brain imaging

    Directory of Open Access Journals (Sweden)

    Alessandra Boschi

    2007-09-01

    Full Text Available A novel class of Tc-99m complexes able to cross the blood brain barrier has been investigated and described here. These compounds are formed by reacting the bis-substituted nitrido precusors [99mTc(N(PS2] (PS = phosphino-thiol ligand with triethylborane (BEt3 under strictly anhydrous conditions and using non-aqueous solvents. The molecular structure of these tracers was not fully established, but preliminary experimental evidence suggests that they result from the interaction of the Lewis base [99mTc(N(PS2] with the Lewis acid BEt3, which leads to the formation of the novel -B-Nº Tc- adduct. After purification and recovery in a physiological solution, the new borane-nitrido Tc-99m derivatives were injected in rats for evaluating their in vivo biological behavior. Results showed a significant accumulation in brain tissue, thus indicating that these complexes are capable of penetrating the intact blood brain barrier. Uptake in the central nervous system was confirmed by imaging the distribution of activity on the integrated living animal using a YAP(SSPECT small animal scanner.Uma nova classe de complexos de Tc-99m capazes de atravessar a barreira hemato-encefálica foi investigada e descrita neste trabalho. Estes compostos são formados reagindo os precursores bissubstituídos do nitrido [99mTc(N(PS2] (PS = phosphino-tiol ligante com trietillborano (BEt3 sob restritas condições anidras e usando solventes não aquosos. A estrutura molecular desses traçadores não foi totalmente estabelecida, mas evidências experimentais preliminares sugerem que eles resultam da interação da base de Lewis [99mTc(N(PS2] com o ácido de Lewis BEt3, levando a formação do novo aducto -B-Nº Tc-. Após purificação e recuperação em uma solução fisiológica, os novos derivados borano-nitrido-Tc-99m foram injetados em ratos para avaliação de seu comportamento biológico in vivo. Os resultados mostraram uma acumulação significativa no tecido cerebral

  12. Development of Tc-99m labeled myocardial imaging agent

    International Nuclear Information System (INIS)

    Jeong, J. M.; Jang, Y. S.; Kim, Y. J.; Lee, Y. S.; Kim, H. W.; Ray, G.; Lee, M. S.

    2006-02-01

    Lipophilic cations have been widely used for myocardial SPECT. We synthesized novel +1 charged lipophilic Tc-99m-labeled N,N'-disubstituted N2S2 derivatives and investigated their biodistribution. The N,N'-dimethyl-, N,N'-diethyl-, N,N'-bis(methoxyethyl)-, and N,N'-bis(ethoxyethyl)N2S2 derivatives were synthesized by alkylating disulfide form of N2S2 with corresponding alkyl halides and subsequently reduced with LAH in THF. To label with Tc-99m, 50% gluconic acid (0.1 ml), SnCl2·2H2O (10 μg), Tc-99m-pertechnetate (370 MBq/2.5 ml) and 0.5 M Na2CO3 (0.3 ml) were added to the compounds. These mixtures were reacted in boiling water bath for 30∼60 min. Radiochemical purities were checked by Whatman No.1 chromatography (normal saline, Rf 0.3∼0.4). Biodistribution of each compound was investigated after injecting 74 kBq (0.1 ml) of each Tc-99m-labeled compound to ICR-mice through the tail vein. Chemical structures of synthesized compounds were confirmed by GC-MSD and 1H-NMR spectroscopy. All of the Tc-99m-labeled compound showed labeling efficiencies of higher than 93%. In biodistribution study, the myocardial uptake of Tc-99m-N,N'-dimethylN2S2, Tc-99m-N,N'-diethylN2S2, Tc-99m-N,N'-bis(methoxyethyl)N2S2 and Tc-99m-N,N'-bis(ethoxyethyl)N2S2 were 5.38 ±0.96, 2.98 ±0.16, 4.27 ±0.47, 7.24 ±1.01% ID/g at 10 min and 5.34 ±1.57, 2.05 ±0.40, 1.02 ±0.16, 1.69 ±0.04% ID/g at 2 hr, respectively. We successfully synthesized Tc-99m-labeled N,N-disubstituted N2S2 derivatives that are novel lipophilic +1 charged compounds. We thought our results prove the feasibility of these compounds to use for myocardial SPECT agent

  13. Tc-99m tilmanocept versus Tc-99m sulfur colloid in breast cancer sentinel lymph node identification: Results from a randomized, blinded clinical trial.

    Science.gov (United States)

    Unkart, Jonathan T; Hosseini, Ava; Wallace, Anne M

    2017-12-01

    No prior trials have compared sentinel lymph node (SLN) identification outcomes between Tc-99m tilmanocept (TcTM) and Tc-99m sulfur colloid (TcSC) in breast cancer (BC). We report on the secondary outcomes from a randomized, double-blinded, single surgeon clinical trial comparing post-injection site pain between TcTM and TcSC. Patients were randomized to receive a preoperative single, peritumoral intradermal injection of TcTM or TcSC. The number of total, "hot", and blue nodes detected and removed were compared between groups. Fifty-two (27-TcSC and 25-TcTM) patients were enrolled and underwent definitive surgical treatment. At least one "hot" SLN was detected in all patients. Three (5.8%) patients had a disease positive-SLN. The total number of SLNs removed was 61 (mean 2.26 (standard deviation (SD) 0.90)) in the TcSC group and 54 (mean 2.16 (SD 0.90)) in the TcTM group, P = 0.69. The total number of "hot" nodes in the TcSC group was 1.96 (SD 0.76) compared to 2.04 (SD 0.73) in the TcTM group, P = 0.71. The number of identified SLNs did not differ significantly between TcTM and TcSC. Given that no significant technical advantages exist between the two agents, surgeons should choose a radiopharmaceutical based on cost and side effect profile. © 2017 Wiley Periodicals, Inc.

  14. Production and clinical evaluation of 99mTc-octreotide

    International Nuclear Information System (INIS)

    Fettich, J.; Kolenc-Peitl, P.

    2004-01-01

    Full text: Due to advantages of 99m-Tc labelled radiopharmaceuticals we examined the feasibility of producing 99m-Tcoctreotide in our laboratory and compare the results with 111-In-octreotide in the same patients. Keeping constant amount of components without exceeding amount of the peptide used, preparation of 99m-Tc-ethylendiaminediacetic- acidhydrazinonicotinamide-D-Phe1,Tyr3-octreotide (99m-Tc EDDA/HYNIC-TOC) was achieved. Radiochemical purity was tested using high-pressure liquid chromatography for 24 hours. In vitro stability testing of the product showed that radiochemical purity remained above 95% for 24 hours and the radiopharmaceutical was found suitable for human use. 5 - 10 μg of the peptide labelled with 550-650 MBq of 99m-Tc was prepared for each patient. 32 patients with clinically suspicious or confirmed carcinoid were investigated with 550 - 650 MBq 99m-Tcoctreotide prepared in our laboratory followed by 110 MBq 111-In-octreotide (Octreoscan, Mallinkrodt). Whole body scintigraphy and abdominal SPECT were performed 4 and 20 hrs after injection of respective radiopharmaceutical. In all patients both studies were acquired within 5 days. All patients gave informed consent for the study as required by Ethics committee. No abnormal tracer uptake was seen anywhere in the body in 12 patient with either of the radiopharmaceuticals. These were used to assess normal distribution of both radiopharmaceuticals. Normal accumulation was seen in case of both radiopharmaceuticals in the spleen, kidneys, liver and gallbladder. Biliary activity was seen in the gut in patients that were not well prepared for the study. There was significantly less activity seen in the kidneys in case of 99m-Tc-octreotide. This could be explained by higher hydrophilicity of the 99m-Tc-EDDA/HYNEC-TOC molecules as compared with 111-In-DTPA-octreotide. 20 patients with confirmed carcinoids showed abnormal uptake but without any difference in distribution of the two radiopharmaceuticals

  15. Power Systems Development Facility Gasification Test Run TC07

    Energy Technology Data Exchange (ETDEWEB)

    Southern Company Services

    2002-04-05

    This report discusses Test Campaign TC07 of the Kellogg Brown & Root, Inc. (KBR) Transport Reactor train with a Siemens Westinghouse Power Corporation (Siemens Westinghouse) particle filter system at the Power Systems Development Facility (PSDF) located in Wilsonville, Alabama. The Transport Reactor is an advanced circulating fluidized-bed reactor designed to operate as either a combustor or a gasifier using a particulate control device (PCD). The Transport Reactor was operated as a pressurized gasifier during TC07. Prior to TC07, the Transport Reactor was modified to allow operations as an oxygen-blown gasifier. Test Run TC07 was started on December 11, 2001, and the sand circulation tests (TC07A) were completed on December 14, 2001. The coal-feed tests (TC07B-D) were started on January 17, 2002 and completed on April 5, 2002. Due to operational difficulties with the reactor, the unit was taken offline several times. The reactor temperature was varied between 1,700 and 1,780 F at pressures from 200 to 240 psig. In TC07, 679 hours of solid circulation and 442 hours of coal feed, 398 hours with PRB coal and 44 hours with coal from the Calumet mine, and 33 hours of coke breeze feed were attained. Reactor operations were problematic due to instrumentation problems in the LMZ resulting in much higher than desired operating temperatures in the reactor. Both reactor and PCD operations were stable and the modifications to the lower part of the gasifier performed well while testing the gasifier with PRB coal feed.

  16. Power Systems Development Facility Gasification Test Campaign TC25

    Energy Technology Data Exchange (ETDEWEB)

    Southern Company Services

    2008-12-01

    In support of technology development to utilize coal for efficient, affordable, and environmentally clean power generation, the Power Systems Development Facility (PSDF), located in Wilsonville, Alabama, routinely demonstrates gasification technologies using various types of coals. The PSDF is an engineering scale demonstration of key features of advanced coal-fired power systems, including a KBR Transport Gasifier, a hot gas particulate control device, advanced syngas cleanup systems, and high-pressure solids handling systems. This report summarizes the results of TC25, the second test campaign using a high moisture lignite coal from the Red Hills mine in Mississippi as the feedstock in the modified Transport Gasifier configuration. TC25 was conducted from July 4, 2008, through August 12, 2008. During TC25, the PSDF gasification process operated for 742 hours in air-blown gasification mode. Operation with the Mississippi lignite was significantly improved in TC25 compared to the previous test (TC22) with this fuel due to the addition of a fluid bed coal dryer. The new dryer was installed to dry coals with very high moisture contents for reliable coal feeding. The TC25 test campaign demonstrated steady operation with high carbon conversion and optimized performance of the coal handling and gasifier systems. Operation during TC25 provided the opportunity for further testing of instrumentation enhancements, hot gas filter materials, and advanced syngas cleanup technologies. The PSDF site was also made available for testing of the National Energy Technology Laboratory's fuel cell module and Media Process Technology's hydrogen selective membrane with syngas from the Transport Gasifier.

  17. Scintigraphic visualization of extrahepatic portal circulation in patients with portal hypertension using /sup 99m/Tc-tin-colloid and /sup 99m/Tc-HIDA

    Energy Technology Data Exchange (ETDEWEB)

    Al-Hussoni, M H; Jasim, M N; Shubbar, A H

    1985-01-01

    Rapid dynamic sequential scintigraphy of the abdomen with /sup 99m/Tc-tin-colloid and /sup 99m/Tc-HIDA has been used to evaluate two patients with portal hypertension. /sup 99m/Tc-tin-colloid was useful for visualization of diliated vessels in the abdomen. Radionuclide hepatobiliary imaging was useful in such cases in evaluation of the hepatobiliary system.

  18. The Goettingen high-Tc superconductivity research pool: the effects of structure and structural defects on the performance of high-Tc superconductors. Final reports

    International Nuclear Information System (INIS)

    1992-02-01

    The compilation presents the final reports prepared by the various teams of the Goettingen research pool for high-Tc superconductivity. The reports are entitled: Structure and phase transition in high-Tc superconductors (Krebs/Freyhardt). Preparation and critical properties of high-Tc superconductors (Freyhardt/Heinemann/Zimmermann). EMC measurements in high-Tc superconductors (Bormann/Noelting). Phase analysis of the various phases observed in the preparation of high-Tc superconductors (Faupel/Hehenkamp). Positron annihilation in high-Tc superconductors (Hehenkamp). Preparation and characterization of thin films consisting of superconducting oxide ceramics (v. Minnigerode/Samwer). High-Tc superconductivity in monocrystals (Winzer/Beuermann). Microwave conductivity in high-Tc superconductors (Helberg). High-resolution structural analyses in high-Tc superconductors (Kupcik/Bente). Synthesis, structural analyses and spectroscopy of high-Tc superconductors (Bente). Synthesis, monocrystal growing, crystal structure of high-Tc superconductors (Schwarzmann). Ion-beam-aided studies in high-Tc superconductors (Uhrmacher). (orig./MM) [de

  19. Preparation and biological profile of 99mTc-lidocaine as a cardioselective imaging agent using 99mTc eluted from 99Mo/99mTc generator based on Al-Mo gel

    International Nuclear Information System (INIS)

    Sakr, T.M.; October University of Modern Sciences and Arts; Ibrahim, A.B.; Rashed, H.M.; Fasih, T.W.

    2017-01-01

    The current study is aimed to prepare 99m Tc-lidocaine as a new myocardial perfusion-imaging agent. The used 99m Tc was obtained from Al- 99 Mo-molybdate(VI) gel matrix. 99m Tc-lidocaine showed higher (15.4 ± 0.11% ID/g) and faster (15 min post injection) cardiac uptake than the recently studied 99m Tc-valsartan and 99m Tc-procainamide. Consequently, 99m Tc-lidocaine will be a valuable myocardial SPECT agent for diagnosis of emergency patients. Besides, the receptor affinity study confirmed the selectivity of 99m Tc-lidocaine for sodium channels in the heart. (author)

  20. Quantifying Tc-99 contamination in a fuel fabrication plant - 59024

    International Nuclear Information System (INIS)

    Darbyshire, Carol; Burgess, Pete

    2012-01-01

    The Springfields facility manufactures nuclear fuel products for the UK's nuclear power stations and for international customers. Fuel manufacture is scheduled to continue into the future. In addition to fuel manufacture, Springfields is also undertaking decommissioning activities. Today it is run and operated by Springfields Fuels Limited, under the management of Westinghouse Electric UK Limited. The site has been operating since 1946 manufacturing nuclear fuel. As part of the decommissioning activities, there was a need was to quantify contamination in a large redundant building. This building had been used to process uranium derived from uranium ore concentrate but had also processed a limited quantity of recycled uranium. The major non-uranic contaminant was Tc-99. The aim was to be able to identify any areas where the bulk activity exceeded 0.4 Bq/g Tc-99 as this would preclude the demolition rubble being sent to the local disposal facility. The problems associated with this project were the presence of significant uranium contamination, the realisation that both the Tc-99 and the uranium had diffused into the brickwork to a significant depth and the relatively low beta energy of Tc-99. The uranium was accompanied by Pa-234m, an energetic beta emitter. The concentration/depth profile was determined for several areas on the plant for Tc-99 and for uranium. The radiochemical analysis was performed locally but the performance of the local laboratory was checked during the initial investigation by splitting samples three ways and having confirmation analyses performed by 2 other laboratories. The results showed surprisingly consistent concentration gradients for Tc-99 and for uranium across the samples. Using that information, the instrument response was calculated for Tc-99 using the observed diffusion gradient and averaged through the full 225 mm of brick wall, as agreed by the regulator. The Tc-99 and uranium contributions to the detector signal were separated

  1. CT assessment of thoracic gunshot wounds. Our personal experience; Ruolo della Tomografia Computerizzata nelle lesioni da arma da fuoco del torace. Esperienza personale

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; De Rosa, A. [Ospedale Loreto Mare, Neaples (Italy). Servizio di Radiologia; Carbone, M.; Rossi, E.; Burnese, L. [Neaples Univ., Neaples (Italy). Ist. di Scienze Radiologiche; Muto, M.; Tuccillo, M. [Azienda Ospedaliera di Rilievo Nazionale A. Cardarelli, Neaples (Italy). Servizio di Neuroradiologia, 2 Servizio di Radiologia; Nunziata, A. [Pronto Soccorso Est, ASL NA1, Neaples (Italy). Area di Diagnostica per Immagini

    1999-11-01

    CT is a valuable tool in assessing thoracic gunshot wounds. CT is also the method of choice in emergency, because it permits rapid depiction of bullet damage to the chest and to other body districts. This in turn permits correct assessment of the main thoracic injuries, plus adequate and prompt planning of surgical treatment or support intensive care. It is reported on the role of CT in diagnosing the complex pleuropulmonary, cardiovascular and thoracic wall injuries caused by gunshot wounds, with their specific and acute signs which differ greatly fro those of other types of chest trauma. In the last 4 years, it was observed an amount of 76 cases of gunshot injury, twenty-six of them involved the chest. The patients, 25 men and 1 woman (mean age: 32 years, range: 17-48), were all submitted to emergency CT with iv contrast agent injection and the CT-angiography technique. The reanimator was always presented to monitor the patients' vital functions and shock state. CT of the chest was integrated with CT of the abdomen and pelvis in 4 cases and with CT of the skull in 3 cases, to detect associated bullet wounds if any. Chest radiography shows major gunshot wound damage to the chest and lungs, except for heart injuries and minimal pneumothorax. When abdominal and skull injuries are associated, CT should be the method of choice because it permits prompt and panoramic assessment of the severity of pulmonary and extra thoracic damage. This results in prompt and targeted treatment, avoiding unnecessary delays which may damage the patient further. [Italian] L'impiego della TC nella valutazione del paziente con lesioni da arma da fuoco del torace risulta essenziale e prioritario rispetto ad altre metodiche di diagnostica per immagini, poiche' consente di avere la rapida visione d'insieme dei danni provocati dal proiettile nel suo impatto con le strutture toraciche e con altri distretti corporei coinvolti. Cio' permette il corretto inquadramento

  2. Liver trauma from penetrating injuries. Miscellanea, personal series, clinical and CT findings; Traumi epatici da lesioni penetranti. Miscellanea, casistica personale, aspetti clinici e con Tomografia Computerizzata

    Energy Technology Data Exchange (ETDEWEB)

    Salzano, A.; Nocera, V. [Ospedale San Giovanni di Dio di Frattamaggiore, Servizio di Radiologia, Frattamaggiore, NA (Italy); De Rosa, A.; Vigliotti, A. [Azienda Sanitaria Locale NA1, Radiologia, Naples (Italy); Rossi, E.; Carbone, M.; Gatta, G. [Naples Univ. Federico 2., Naples (Italy). Ist. di Scienze Radiologiche; Vitale, L. [Ospedale di Sorrento, Servizio di Radiologia, Sorrento, NA (Italy)

    2000-12-01

    the extent and severity of damage, which permits to choose a conservative treatment in case of intraparenchymal hematomas and lacerocontusive foci without hemoperitoneum, which can be followed-up with physical and CT examinations. Moreover, Helical CT could provide the early diagnosis of active bleeding in the peritoneum and of focal bleeding in the liver, thus permitting prompt hepatorrraphy or targeted hepatectomy. A diaphragm injury suspected at CT should always prompt the surgeon to intervention, especially when hemothorax, lung base pneumothorax, large liver hematoma or tear of the liver dome are associated. Finally, subdiaphragmatic free gas indicates gut perforation associated with liver damage, in which case surgery is necessary too. [Italian] Le ferite penetranti del fegato sono dovute a molteplici cause, e occupano il secondo posto dopo i traumi chiusi epato-addominali. Scopo del lavoro e' di illustrare i vari quadri clinico-radiologici della nostra casistica personale, determinati da lesioni penetranti da armi da fuoco e da punta e taglio. Definire inoltre la modalita' di diagnosi, soprattutto in base ai segni TC del danno epatico e di lesioni associate, che condizionano in modo decisivo la terapia e l'approccio chirurgico o conservativo. Negli ultimi sette anni sono stati studiati retrospettivamente 31 casi (19 maschi e 12 femmine; eta' media 42 anni, compresa tra 18 e 73 anni), con lesioni penetranti del fegato, dovute prevalentemente a armi da fuoco (16 pazienti), a armi da punta e taglio (9 casi) e miscellanee in 6. L'esame TC dell'addome e' stato eseguito in emergenza e con tecnica angio-TC in tutti i pazienti. Nei casi di ferite con sospetto coinvolgimento toraco-addominale, la TC veniva iniziata dal medio-torace al fine di una valutazione accurata del diaframma, delle basi polmonari e per escludere lesioni pleuropolmonari associate. Nel 70% dei casi le ferite penetranti epatiche erano in relazione ad arma da fuoco

  3. Distribution and migration of 99Tc in surface soil

    International Nuclear Information System (INIS)

    Uezu, Yasuhiro; Watanabe, Hitoshi; Takeishi, Minoru; Shinohara, Kunihiko

    2001-01-01

    99 Tc is produced in a high yield of 6% upon nuclear fission of 235 U, 239 Pu and so on. It is one of the important nuclides in existence around nuclear facilities because it has an extremely long half-life of 214,000 years and various chemical forms in soils. Based on the results of tracer experiments that have been conducted by research organizations in various laboratories, it was thought that the transfer velocity of 99 Tc in soils would be high. However, it was found from the results of analysis of actual soil samples that the transfer factor of 99 Tc from soil to plants was about 100 times smaller than that of the reported value. The vertical transfer of TcO 4 - (7 valences) is faster than that of TcO 2 (4 valences). These results suggest that an environmental assessment on a long-term scale in connection with the environmental assessment of low-level waste from nuclear facilities and an environmental assessment of contaminated areas should be based on parameters from field data. (author)

  4. Magnetically-related properties of bismuth containing high Tc superconductors

    Science.gov (United States)

    Vezzoli, Gary C.; Chen, M. F.; Craver, F.; Safari, A.; Moon, B. M.; Lalevic, B.; Burke, Terence; Shoga, M.

    1990-08-01

    The effect of magnetic fields to 15 T on electrical resistance has been measured for the BiSrCaCuO superconductor at precise temperatures during the transition to the superconducting state from pre-onset conditions to essentially zero resistance conditions. The results show that the temperature at which the magnetic field causes a divergence in the resistance versus 1000/ T curve is approximately the same temperature as the value at which, during cooling, the positive Hall coefficient begins its abrupt descent to zero. This temperature gives the best measure of Tc. It is also shown that small oscillations of low frequency start near onset conditions, the amplitude of which at a given temperature is B-field dependent. Additionally, Hall effect studies as a function of temperature at 4 T in three separate experiments (including high Tc BiSrCaCu PbO of > 90% theoretical density) show that sharp delta-function-like peaks in + RH are observed near Tc and are superimposed on a broader maximum. The Hall data are explicable in terms of exciton formation and ionization. The bound holes associated with these excitons are believed to be the mediators producing Cooper-pairing, and scale very well with Tc for all the known high Tc oxides.

  5. Hepatobiliary scanning using /sup 99m/Tc--pyridoxylideneglutamate

    International Nuclear Information System (INIS)

    Matolo, N.M.; Stadalnik, R.C.; Wolfman, E.F. Jr.

    1977-01-01

    Technetium 99m-pyridoxylideneglutamate (99mTc-PG) administered intravenously is excreted by hepatocytes into the bile canaliculi and enters the gallbladder through the cystic duct and consequently, can be used for scanning the hepatobiliary ductal system. A total of 166 patients representing 27 normal subjects, 84 patients referred for investigation for pain in the upper right quadrant of the abdomen and 55 jaundiced patients were evaluated with 99mTc-PG. In normal human volunteers, the agent reached the liver in five minutes, and the common bile duct, gallbladder, and duodenum within 15 minutes. Satisfactory images of the hepatobiliary tract were obtained using small dosages of 99mTc-PG. The gallbladder was not visualized when the cystic duct was occluded. In the presence of acute cholecystitis, cystic duct obstruction, or in chronic cholecystitis where other roentgenographic studies showed a nonfunctioning gallbladder, there was no concentration of 99mTc-PG in the gallbladder. In partial common bile duct obstruction, distended common bile duct was visualized along with delay in transit of radioactivity into the duodenum. Complete common bile duct obstruction was associated with no radioactivity in either the biliary or the gastrointestinal tracts up to 24 hours after injection. Hepatocellular disease was characterized by delayed liver clearance and delayed visualization of biliary and gastrointestinal tracts. 99mTc-PG scanning proved capable of differentiating betweenhepatocellular disease and extrahepatic biliary tract obstruction

  6. Technetium-99 in ''instant'' sup(99m)Tc-pertechnetate

    International Nuclear Information System (INIS)

    Mattsson, S.

    1978-01-01

    The 99 Tc-content in sup(99m)Tc-pertechnetate separated from 99 Mo by distillation or extraction has been studied with a plastic scintillation detector. The identification of the measured activity was achieved by beta-spectrometry, chemical separation and half-life studies. The frequency distribution of the sup(99)Tc/sup(99m)Tc-ratios in the different samples was observed to be log-normal. The most likely activity ratio was 0.4x10 -6 , the maximum value being 5x10 -6 . The specific activity of ''instant'' pertechnetate is approximately a factor of 60 lower than that normally recorded in pertechnetate derived from daily eluted column generators. The low specific activity of ''instant'' pertechnetate is primarily explained by the long time between separation and usage and secondly by the low yield of Tc in the distillation and extraction processes. In several of the ''instant'' pertechnetate solutions the carrier concentration exceeded the reductive capacity of the stannous ions in ''kits'' with small amounts of Sn(II) in usable form. (T.G.)

  7. Liver scintigraphy with sup(99m)Tc-Sn-colloid

    International Nuclear Information System (INIS)

    Suzuki, Masaaki

    1976-01-01

    Basic and clinical studies of sup(99m)Tc-Sn-colloid (Tc-Sn-C) were made on liver scintigraphy for comparison with 198 Au-colloid in blood clearance, liver accumulation, and spleen imaging strength. Tc-Sn-C was excellent in ease of sterilization, simplicity of preparation, reduction in the exposure dose for the examiner, labeling rate, and stability, and it was effective as a drug for liver scintigraphy. The blood clearance T1/2 can be an indicator for the blood flow rate in the liver, similarly to the Au-C method. Although a decrease in the liver radioactivity after liver accumulation was observed, it was not thought to affect liver scintigraphy. A clear shadow of the liver was obtained in all cases, and there seemed to be no differences between the commercially prepared Tc-Sn-C and the Tc-Sn-C which must be prepared each time. The spleen imaging strength was thought to be effective as a supplementary diagnosis for splenic diseases. No allergic symptoms appeared immediately after examination. (Chiba, N.)

  8. Hepatic accumulation of sup(99m)Tc-Sn-diphosphonate

    International Nuclear Information System (INIS)

    Hayashi, Sanshin; Oyama, Kazuyuki; Hirakawa, Ken; Akaike, Akira; Kogure, Takashi

    1977-01-01

    Six cases of hepatic accumulation of sup(99m)Tc-Sn-EHDP (ethane-1-hydroxy-1,1-diphosphonate) were encountered among 31 cases of bone scintigram. There were no uniformly common factors in sex, age, disease, liver function, or other laboratory data in these six patients. Colloidal formation was suspected since sup(99m)Tc-Sn-EHDP accumulated in the liver and spleen. EHDP vials from the same kit were analyzed and nothing abnormal was detected. EHDP vials of the same lot number were used in all of 31 cases. Samples of sup(99m)Tc eluate obtained from the same generator used to prepare EHDP and saline eluent from the same stock material used to elute the generator were analyzed. A small amount of aluminum ion and other oxidizer were found but they were thought to be insufficient as factors in the high liver uptake of EHDP because of too small a quantity. pH of sup(99m)Tc eluate was not unusual. Colloidal formation at the time of preparation of sup(99m)Tc-Sn-EHDP is not conceivable since most of the patients undergo bone scintigram without hepatic accumulation. It was assumed that somatic metallic ion substance, serum protein, or other endogeneous matter was responsible for the high liver uptake of EHDP. (auth.)

  9. 99mTc-tetrapeptides: radiolabelling and biodistribution in rats

    International Nuclear Information System (INIS)

    Laznickova, A.; Laznicek, M.; Trejtnar, F.; Mather, S.J.

    1998-01-01

    Preparation of 99m Tc-labelled tetrapeptides, namely acetyl-Gly-Gly-Cys-Gly (I), acetyl-Ser-Ser-Cys-Gly (II) and acetyl-Gly-Gly-Cys-Lys (III), analysis of their radiochemical purity and biodistribution were investigated in rats. The aim was to determine the relationship between structure and biological behaviour of 99m Tc-labelled peptides which are formed by amino-acid sequences capable of chelating technetium useful as universal chelators in ''hybrid'' peptides composed of receptor-specific part and the part chelating technetium. For labelling with 99m Tc, a conventional transchelation from 99m Tc-gluconate was used and radiolabelled peptides were purified by filtration on Whatman microfilters 12 kD. Radiochemical purity was higher than 98%. Biodistribution studies in rats showed that all agents are rapidly cleared from the body mostly via urine, but some part of administered radioactivity also in the faces was found. The later route of elimination way increased in the order III 99m Tc-MAG3. The results obtained will assist with design of optimal biocompatible tetrapeptides as chelators for formation of hybrid receptor-specific peptides. (author)

  10. Redox behavior of Tc(VII)/Tc(IV) under various reducing conditions in 0.1 M NaCl solutions

    International Nuclear Information System (INIS)

    Kobayashi, T.; Gaona, X.; Altmaier, M.; Scheinost, A.C.; Fellhauer, D.; European Commission Joint Research Centre, Karlsruhe

    2013-01-01

    Redox behaviour of Tc(VII)/Tc(IV) was investigated in 0.1 M NaCl solutions containing different reducing agents in the pH range 2 to 13 at 22 C under inert Ar atmosphere. In several samples, the 1 x 10 -5 mol/dm 3 (M) initially added TcO 4 - was reduced to form a Tc(IV) oxide solid phase with low solubility. The observed Tc redox transformation processes are systematized according to E h -pH conditions in solution, indicating that a borderline for the reduction of Tc(VII) to Tc(IV), TcO 4 - + 3e - + 4H + TcO 2 . xH 2 O(coll, hyd) + (2-x)H 2 O exists, independent of the reducing chemical system. This experimentally derived borderline is about 100 mV lower than the equilibrium line calculated from the reported standard redox potential of TcO 2 . 1.6H 2 O(s). This behaviour can be related to the existence of more soluble solid phase modifications, i.e. nanoparticulate Tc(IV) oxide species TcO 2 . xH 2 O(coll, hyd). The reaction kinetics likewise correlate to the redox potential measured in solution. Slow reduction of Tc(VII) to Tc(IV) was observed when the redox potential in the system was slightly below the above mentioned reduction borderline. Fast reduction was observed in the systems far below the borderline, but also in those systems containing Fe(II) solids, suggesting a specific surface mediated effect in the reduction process. EXAFS analysis on two magnetite samples indicate reduced Tc(IV) species which do not remain adsorbed at the reactive mineral surface and are incorporated in the magnetite structure. (orig.)

  11. The preparation and biodistribution of 99mTc-cyclohexanedione dioxime and its methaneboronic acid adduct

    International Nuclear Information System (INIS)

    Luo Shineng; Xie Minhao; Xi Yuefen; Feng Yingying; Guo Yuzhi

    1993-01-01

    The preparation and biodistribution of 99m Tc-cyclohexanedione dioxime ( 99m Tc-CDO) and its methaneboronic acid adduct ( 99m Tc-CDO-MeB) are reported. The result shows that pH value exerts greater effect on the labelling yield of 99m Tc-CDO-MeB than that of 99m Tc-CDO. When pH value was 3.5-4.0, the labelling yield of 99m Tc-CDO-MeB was higher than 90%. Biodistribution experiment showed that 99m Tc-CDO-MeB was taken by heart and brain in the first few minutes after intravenous injection. The uptakes of 99m Tc-CDO-MeB by heart and brain were higher than those of 99m Tc-CDO

  12. Tc Reductant Chemistry and Crucible Melting Studies with Simulated Hanford Low-Activity Waste

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Dong-Sang; Soderquist, Chuck Z.; Icenhower, Jonathan P.; McGrail, B PETER.; Scheele, Randall D.; McNamara, Bruce K.; Bagaasen, Larry M.; Schweiger, Michael J.; Crum, Jarrod V.; Yeager, John D.; Matyas, Josef; Darnell, Lori P.; Schaef, Herbert T.; Owen, Antionette T.; Kozelisky, Anne E.; Snow, Lanee A.; Steele, Marilyn J.

    2005-03-30

    The FY 2003 risk assessment (RA) of bulk vitrification (BV) waste packages used 0.3 wt% of the technetium (Tc) inventory as a leachable salt and found it sufficient to create a significant peak in the groundwater concentration in a 100-meter down-gradient well. Although this peak met regulatory limits, considering uncertainty in the actual Tc salt fraction, peak concentrations could exceed the maximum concentration limit (MCL) under some scenarios so reducing the leachable salt inventory is desirable. The main objective of this study was to reduce the mobile Tc species available within a BV disposal package by reducing the oxidation state of the Tc in the waste feed and/or during melting because Tc in its reduced form of Tc(IV) has a much lower volatility than Tc(VII). Reduced Tc volatility has a secondary benefit of increasing the Tc retention in glass.

  13. Clinical evaluation of myocardial perfusion imaging with 99mTc-CPI

    International Nuclear Information System (INIS)

    Liu Xiujie

    1988-01-01

    10 normal subjects and 55 cases of patients with heart diseases were studied with 99m Tc-CPI myocardial perfusion imaging. The 99m Tc-CPI myocarbial imaging is superior to 99m Tc-TBI, because the uptake of 99m Tc-CPI in both lung and liver is lower. The imaging quality of 99m Tc-CPI is nearly as good as that of 201 Tl. 16 patients had both 99m Tc-CPI myocardial imaging and coronary artery angiography. The sensitivity of 99m Tc-CPI myocardial imaging for detecting coronary artery disease (CAD) was 92%, whereas the sensitivity of ECG was 84.6%. 99m Tc-CPI myocardial tomography was obtained in 17 patients using Toshiba 90B SPECT system. The imaging quality of myocardial tomography using 99m Tc-CPI is very good and superior to planar imaging for detecting myocardial infarction

  14. Characterization of sup(99m)Tc/sup(99)Tc-hydroxycarboxylic acid chelates by high voltage electrophoresis without supporting material

    International Nuclear Information System (INIS)

    Hoffmann, I.; Muenze, R.; Dreyer, I.; Dreyer, R.

    1982-01-01

    Ion mobilities of different sup(99m)Tc- and 99 Tc chelates prepared by reduction of pertechnetate by Sn(II) in the presence of citric, malic, tartaric, gluconic, and α-hydroxyisobutyric acid as ligands have been measured by means of electrophoresis without supporting material. All the chelates investigated proved to be anions in the pH range of 2-7. Both the Tc(V)- and Tc(IV) compounds with the same ligand including the sup(99m)Tc preparation show identical ion mobilities and dissociation characteristics. (author)

  15. Measurement and analyses of spectral noise power in computed tomography; Medida y analisis del espectro de potencias del ruido en imagenes de tomografia computarizada

    Energy Technology Data Exchange (ETDEWEB)

    Castro Tejero, P.; Garayoa Roca, J.

    2014-07-01

    Noise is an important feature of image quality. The standard deviation of pixel value in a uniform region has been frequently used as a metric to characterize noise. However, this measure does not provide any information about the noise spatial distribution. A more complete description is given by the Noise Power Spectrum (NPS) which provides both the amount and the spatial correlation of noise. The objective of the present work is to present a methodology and a computing tool to obtain the NPS, in order to analyze its components and study their behaviour for computed tomography (TC) images. Our results show that the major contribution to NPS is a random source for all the explored working conditions. The structural component is constrained to the low frequency region, where it can be as important as the random component. Moreover, we observe that the reconstruction filter and the acquisition technique, axial or helical, have a clear impact on the image noise. (Author)

  16. Standardization of Tc-99 by three liquid scintillation counting methods

    International Nuclear Information System (INIS)

    Wyngaardt, W.M. van; Staden, M.J. van; Lubbe, J.; Simpson, B.R.S.

    2014-01-01

    The NMISA participated in the international key comparison of the pure beta-emitter Technetium-99, CCRI(II)-K2.Tc-99. The comparison solution was standardized using three methods, namely the TDCR efficiency calculation method, the CIEMAT/NIST efficiency tracing method and the 4π(LS)β–γ coincidence tracing method with Co-60 as tracer. Excellent agreement between results obtained with the three methods confirmed the applicability of the beta spectral shape given by the latest (2011) DDEP evaluation of Tc-99 decay data, rather than the earlier (2004) evaluation. - Highlights: • Activity concentration of Tc-99 solution measured using three LSC methods. • Methods used are TDCR, CNET and 4π(LS)β–γ coincidence tracing. • Beta spectral shape confirmed by agreement between three methods

  17. Gel chromatography of sup(99m)Tc-labelled compounds

    International Nuclear Information System (INIS)

    Vilcek, S.; Machan, V.; Kalincak, M.

    1976-01-01

    The present state of gel chromatography of sup(99m)Tc-labelled compounds is reviewed. Examples are given of gel chromatography for preparing labelled compounds and for quality control analysis and the development of new types of sup(99m)Tc-labelled compounds. The factors which influence the gel chromatography