WorldWideScience

Sample records for 125i permanent implant

  1. Acute urinary morbidity after a permanent 125I implantation for localized prostate cancer.

    Science.gov (United States)

    Ohga, Saiji; Nakamura, Katsumasa; Shioyama, Yoshiyuki; Tatsugami, Katsunori; Sasaki, Tomonari; Nonoshita, Takeshi; Yoshitake, Tadamasa; Asai, Kaori; Hirata, Hideki; Naito, Seiji; Honda, Hiroshi

    2014-11-01

    We evaluated the predictive factors of acute urinary morbidity (AUM) after prostate brachytherapy. From November 2005 to January 2007, 62 patients with localized prostate cancer were treated using brachytherapy. The (125)Iodine ((125)I) seed-delivering method was a modified peripheral pattern. The prescribed dose was 144 Gy. Urinary morbidity was scored at 3 months after implantation. The clinical and treatment parameters were analysed for correlation with AUM. In particular, in this study, Du90 (the minimal dose received by 90% of the urethra), Dup90 (the minimal dose received by 90% of the proximal half of the urethra on the bladder side) and Dud90 (the minimal dose received by 90% of the distal half of the urethra on the penile side) were analysed. We found that 43 patients (69.4%) experienced acute urinary symptoms at 3 months after implantation. Of them, 40 patients had Grade 1 AUM, one patient had Grade 2 pain, and two patients had Grade 2 urinary frequency. None of the patients had ≥Grade 3. Univariate and multivariate analysis revealed that Du90 and Dup90 were significantly correlated with AUM. In this study, Du90 and Dup90 were the most significant predictors of AUM after prostate brachytherapy.

  2. Computed tomography (CT)-guided interstitial permanent implantation of (125)I seeds for refractory chest wall metastasis or recurrence.

    Science.gov (United States)

    Jiang, Ping; Liu, Chen; Wang, Junjie; Yang, Ruijie; Jiang, Yuliang; Tian, Suqing

    2015-02-01

    To evaluate the efficacy and safety of 125I seeds implantation for refractory chest wall (CW) metastasis or recurrence under CT guidance. In addition we assessed initial data obtained on the therapeutic response for refractory CW metastasis or recurrence. Twenty consecutive patients underwent permanent implantation of 125I seeds (from Jul. 2004 to Jan. 2011) under computed tomography (CT) guidance. Postoperative dosimetry was routinely performed for all patients. The actuarial D90 of the implanted 125I seeds ranged from 100 Gy to 160 Gy (median: 130 Gy). The activity of 125I seeds ranged from 0.5 mCi to 0.78 mCi (median: 0.71 mCi). The total number of seeds implanted ranged from 8 to 269 (median: 53). The follow-up period ranged from 3 to 54 months (median: 11.5 months). The survival and local control probabilities were calculated by the Kaplan-Meier method. Among all the 20 patients, 3 patients had complete remission CR (15%), 12 patients had partial remission PR (60%), 5 patients had stable disease SD. The 1-, 2-, 3- and 4-year tumor control rates were all 88.7% respectively. The 1- and 2-, 3-, 4-year cancer specific survival rates were 56.5% and 47.1%, 47.1%, 47.1% respectively. The 1- and 2-, 3-, 4-year overall survival rates were 53.3% and 35.6%, 35.6%, 35.6% respectively, with a median survival of 15 months (95% CI, 7.0-22.9). Mild brachial plexus injury was seen in one patient; grade 1 or 2 skin reactions were seen in 6 patients (30%) who had received external beam radiation therapy (EBRT) before. No grade 3 and 4 skin side effects were found. Rib fracture, ulceration, pneumothorax or hemopneumothorax were not seen. Interstitial permanent implantation of 125I seeds under CT guidance is feasible, efficacious and safe for refractory CW metastasis or recurrence.

  3. Effect of 125I permanent implant brachytherapy on clinically localized prostate cancer%永久性125I植入近距离放疗治疗局限性前列腺癌效果观察

    Institute of Scientific and Technical Information of China (English)

    朱再生; 张春霆; 沈艳; 樊静; 刘江; 刘全启; 陈良佑; 罗荣利; 付强

    2016-01-01

    Objective To analyze oncological outcomes of 125I permanent implant brachytherapy (125I-PIB) in clinically localized prostate cancer. Methods Between June 2008 and June 2015, 121 patients with clinically localized prostate cancer were treated with 125I-PIB, and their average age was 72.37 years old. Before treatment, the average prostate-specific antigen (PSA) level was 17.7 ng/ml, prostate volume was (51.4 ±15.0) cm3, the International Prognostic Scoring System (IPSS) score was (21.6 ±2.4) scores. The intermediate-risk and high-risk patients were treated with adjuvant endocrine or supplemental external beam radiotherapy. All patients were followed-up. Biochemical recurrence was defined as the PSA nadir plus 2.0 ng/ml. Results Average follow-up time of the 121 patients was 41.81 months. The prostate volume was (23.1 ± 10.2) cm3, and the IPSS score was (9.7±3.3) scores. Rates of 5-year overall survival, biochemical recurrence-free survival and cancer-specific survival were 86.7 %, 76.7 % and 96.5 %, respectively. 5-year biochemical recurrence-free survival rates were 88.5 %, 67.5 % and 65.2 % in the low-, intermediate-, and high-risk groups, respectively. Biochemical recurrence-free survival did not differ significantly by three risk groups (P=0.103), but the difference between high-risk and low-risk groups was statistically significant (P=0.028). According to multivariate analysis, higher prostate-specific antigen (P=0.021), higher Gleason score (P=0.023) and higher clinical T stage (P=0.037) were the significant covariates associated with biochemical recurrence-free survival. The addition of hormonal therapy or external beam radiation therapy was associated with significantly better outcomes than brachytherapy monotherapy (P=0.036, P=0.027). As for complications, there were 4 cases of surgery (trans-urethral resection of the prostate) and 4 cases of cardiovascular complications. Conclusions The 125I-PIB can bring excellent oncological outcomes and acceptable

  4. Dosimetry for 125I radioactive seed implantation therapy for hepatocellular carcinoma

    Institute of Scientific and Technical Information of China (English)

    Jin Lü; Xiufeng Cao

    2008-01-01

    Hepatocellular carcinoma (HCC) is an aggressive malignancy. Early lesions respond well to hepatic resection or liver transplantation.However, only a few of HCC patients are suitable for surgical intervention. External beam radiation and chemotherapy is poorly efficacious.In the last 20 years, HCCs belonging to the radiosensitive tumor group has been confirmed. Along with the development of new radiotherapy technology and facilities, the research about brachytherapy(especially 125I seed implantation therapy) has provoked more interests in the world. Radioactive seed implantation therapy is a form of interstitial brachytherapy, with the property of local "conformal radiotherapy" and the advantages of minimal invasion, convenience, high performance, and minimal adverse effects. It is a promising therapy for HCC, however the dosimetry hasn't yet been identified and lacks verification in prospective research. This report aims to further explore the best prescription dose and radioactivity for 125I interstitial implantation brachytherapy for HCC.

  5. Treatment-related symptoms during the first year following transperineal [sup 125]I prostate implantation

    Energy Technology Data Exchange (ETDEWEB)

    Kleinberg, L.; Wallner, K.; Roy, J.; Zelefsky, M.; Arterbery, V.E.; Fuks, Z.; Harrison, L. (Memorial Sloan-Kettering Cancer Center, New York, NY (United States))

    1994-03-01

    The purpose was to summarize the urinary, rectal, and sexual symptoms occurring during the first 12 months following [sup 125]I prostatic implantation. Thirty-one patients with Stage T[sub 1] or T[sub 2] prostatic carcinoma were evaluate for morbidity following computed tomography-guided transperineal [sup 125]I implants from 1988 to 1991. The median total activity used was 47 mCi (range 35-37 mCi). Toxicity was evaluated using a modification of the Radiation Therapy Oncology Group grading system. Nocturia was the most common treatment-related symptom, reported by 80% of patients within 2 months after implantation, and persisted at 12 months in 45% of the patients. Mild dysuria developed in 48% of patients within 2 months of implantation; two patients needed analgesics for their dysuria. Terazosin hydrochloride (2-10 mg qd) provided subjective improvement of urinary symptoms in seven of eight patients in whom it was tried. Rectal urgency, soft stools, and increased frequency of bowel movements was reported by 25% of the patients within 1-2 months after implantation. The incidence of assymptomatic rectal bleeding or ulceration occurring at any time after implantation was 47%, but resolved in all patients with expectant treatment. Self-limiting ulceration of the rectal mucosal occurred in 16%, but only one patient developed a prostato-rectal fistula, managed with an ileal conduit. Five of the 18 potent patients experienced discomfort on erection or ejaculation, beginning within several weeks of their implant. The discomfort resolved within 6 months in three of the patients, but persisted for 18 and 24 months in the other two. [sup 125]I implantation, as performed in this series, is generally associated with only mild-moderate genitourinary and rectal symptoms that may persist 6 months or more after implantation. 16 refs., 6 figs., 2 tabs.

  6. CT-guided 125I Radioactive Seed Implantation on Regional Lymph Node Metastasis after Gastrectomy

    Institute of Scientific and Technical Information of China (English)

    Shi Liangrong; Wu Jun; Jiang Jingting; Wu Changping

    2013-01-01

    Objective:To evaluate the safety and short-term effect of CT-guided 125I radioactive seed implantation on regional lymph node metastasis after gastrectomy. Methods:Twenty-three patients with regional lymph node metastasis after gastrectomy received CT-guided 125I radioactive seed implantation from June, 2007 to July, 2011 in our hospital. The overall activity and amount of radioactive seeds were calculated by simulating source distribution of radioactive seed implantation plan system before operation. 125I seeds were implanted under the guidance of CT. Effective rate was evaluated according to RECIST criterion, 1, 2 and 3 years of survival rates were calculated by life table method, the effect of relative factors on survival was tested by univariate COX model, and the survival differences between subgroups were compared to draw survival curve by log-rank method. Additionally, systemic therapies were given to 20 patients based on lfuorouracil drugs. Results:No severe complications was observed in all study subjects with 14 complete remission (60.9%), 5 particle remission (21.7%) and 4 progressive diseases (17.4%), while 1, 2 and 3 years of survival rates as well as median survival time being (87±7)%,(47±11)%, (13±9)% and (22.1±5.1) months, respectively. Univariate COX analysis showed that the maximum diameter of tumor could badly inlfuence the prognosis (χ2=9.752, P=0.002), and the subgroups analysis relieved the signiifcant difference (χ2=5.828, P=0.016, log-rank test) with 3 cm being the cut-off value. Conclusion:CT-guided 125I radioactive seed implantation has high local control rate with small trauma and slight complications.

  7. CT-guided 125I Radioactive Seed Implantation on Regional Lymph Node Metastasis after Gastrectomy

    Directory of Open Access Journals (Sweden)

    Liangrong Shi

    2013-09-01

    Full Text Available Objective: To evaluate the safety and short-term effect of CT-guided 125I radioactive seed implantation on regional lymph node metastasis after gastrectomy. Methods: Twenty-three patients with regional lymph node metastasis after gastrectomy received CT-guided 125I radioactive seed implantation from June, 2007 to July, 2011 in our hospital. The overall activity and amount of radioactive seeds were calculated by simulating source distribution of radioactive seed implantation plan system before operation. 125I seeds were implanted under the guidance of CT. Effective rate was evaluated according to RECIST criterion, 1, 2 and 3 years of survival rates were calculated by life table method, the effect of relative factors on survival was tested by univariate COX model, and the survival differences between subgroups were compared to draw survival curve by log-rank method. Additionally, systemic therapies were given to 20 patients based on fluorouracil drugs. Results: No severe complications was observed in all study subjects with 14 complete remission (60.9 % , 5 particle remission (21.7 % and 4 progressive diseases (17.4 % , while 1, 2 and 3 years of survival rates as well as median survival time being (87±7 %,(47±11 % , (13±9 % and (22.1±5.1 months, respectively. Univariate COX analysis showed that the maximum diameter of tumor could badly influence the prognosis (χ2 = 9.752, P = 0.002, and the subgroups analysis relieved the significant difference (χ2 = 5.828, P = 0.016, log-rank test with 3 cm being the cut-off value. Conclusion: CT-guided 125I radioactive seed implantation has high local control rate with small trauma and slight complications.

  8. Permanent 125I-seed prostate brachytherapy: early prostate specific antigen value as a predictor of PSA bounce occurrence

    Directory of Open Access Journals (Sweden)

    Mazeron Renaud

    2012-03-01

    Full Text Available Abstract Purpose To evaluate predictive factors for PSA bounce after 125I permanent seed prostate brachytherapy and identify criteria that distinguish between benign bounces and biochemical relapses. Materials and methods Men treated with exclusive permanent 125I seed brachytherapy from November 1999, with at least a 36 months follow-up were included. Bounce was defined as an increase ≥ 0.2 ng/ml above the nadir, followed by a spontaneous return to the nadir. Biochemical failure (BF was defined using the criteria of the Phoenix conference: nadir +2 ng/ml. Results 198 men were included. After a median follow-up of 63.9 months, 21 patients experienced a BF, and 35.9% had at least one bounce which occurred after a median period of 17 months after implantation (4-50. Bounce amplitude was 0.6 ng/ml (0.2-5.1, and duration was 13.6 months (4.0-44.9. In 12.5%, bounce magnitude exceeded the threshold defining BF. Age at the time of treatment and high PSA level assessed at 6 weeks were significantly correlated with bounce but not with BF. Bounce patients had a higher BF free survival than the others (100% versus 92%, p = 0,007. In case of PSA increase, PSA doubling time and velocity were not significantly different between bounce and BF patients. Bounces occurred significantly earlier than relapses and than nadir + 0.2 ng/ml in BF patients (17 vs 27.8 months, p Conclusion High PSA value assessed 6 weeks after brachytherapy and young age were significantly associated to a higher risk of bounces but not to BF. Long delays between brachytherapy and PSA increase are more indicative of BF.

  9. CT-Guided Radioactive {sup 125}I Seed Implantation Therapy of Symptomatic Retroperitoneal Lymph Node Metastases

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Zhongmin, E-mail: wzm0722@hotmail.com [Shanghai Jiaotong University School of Medicine, Department of Nuclear Medicine, Renji Hospital (China); Lu, Jian; Gong, Ju; Zhang, Liyun [Shanghai Jiaotong University School of Medicine, Department of Radiology, Ruijin Hospital Luwan Branch (China); Xu, Yingjia [Shanghai Jiao Tong University, Department of Cardiology, Shanghai Chest Hospital (China); Song, Shaoli [Shanghai Jiaotong University School of Medicine, Department of Nuclear Medicine, Renji Hospital (China); Chen, Kemin [Shanghai Jiaotong University School of Medicine, Department of Radiology, Ruijin Hospital (China); Liu, Fenju [Soochow University, School of Radiation Medicine and Public Health (China); Gang, Huang, E-mail: huanggang0722@hotmail.com [Shanghai Jiaotong University School of Medicine, Department of Nuclear Medicine, Renji Hospital (China)

    2013-04-12

    PurposeThis study explored the clinical efficacy of CT-guided radioactive {sup 125}I seed implantation in treating patients with symptomatic retroperitoneal lymph node metastases.MethodsTwenty-five patients with pathologically confirmed malignant tumors received CT-guided radioactive {sup 125}I seed implantation to treat metastatic lymph nodes. The diameter of the metastatic lymph nodes ranged from 1.5 to 4.5 cm. Treatment planning system (TPS) was used to reconstruct the three-dimensional image of the tumor and then calculate the corresponding quantity and distribution of {sup 125}I seeds.ResultsFollow-up period for this group of patients was 2–30 months, and median time was 16 months. Symptoms of refractory pain were significantly resolved postimplantation (P < 0.05), and Karnofsky score rose dramatically (P < 0.05). Most patients reported pain relief 2–5 days after treatment. Follow-up imaging studies were performed 2 months later, which revealed CR in 7 patients, PR in 13 patients, SD in 3 patients, and PD in 2 patients. The overall effective rate (CR + PR) was 80 %. Median survival time was 25.5 months. Seven patients died of recurrent tumor; 16 patients died of multiorgan failure or other metastases. Two patients survived after 30 months follow-up. Two patients reported localized skin erythema 1 week postimplantation, which disappeared after topical treatment.ConclusionsCT-guided radioactive {sup 125}I seed implantation, which showed good palliative pain relief with acceptable short-term effects, has proved in our study to be a new, safe, effective, and relatively uncomplicated treatment option for symptomatic retroperitoneal metastatic lymph nodes.

  10. Pathological impairments induced by interstitial implantation of 125I Seeds in spinal canal of banna mini-pigs

    Directory of Open Access Journals (Sweden)

    Yang Zuozhang

    2012-03-01

    Full Text Available Abstract Background Use a banna mini-pig to set up 125I implantation model, and investigate the consequence of radiation-related impairments. Methods In present study, 125I seeds were implanted into spinal canal of T13 level of spine in banna mini-pigs. After operation, the pigs were raised up to 8 months, behavior changes were recorded within this period. After 8 months, spinal cords were collected for pathological analysis. Results In this study, a 125I brachytherapy animal model had been successfully established, in the model group, the banna pigs' Tarlov scale decreased from 5 to 2.57 ± 0.36, significant cellular impairments were noted by pathological analysis. Conclusions Without any protection and operation improvement, 125I implantation can cause serious histological impairments and moving difficulty for banna mini-pigs; this present research provides an alternative tool to study spinal 125I brachytherapy.

  11. Study on Treating Glioblastoma with 125I Seed Implantation during Operations

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    OBJECTIVE To evaluate the therapeutic efficacy of treating glioblastoma with interstitial irradiation using radioactive seeds.METHODS First, the tumor was removed as completely as possible under an operating microscope. Then 125I seeds which had been selected were implanted in the tumor bed followed by routine radiotherapy after the operation. The time of progression (TTP) and overall survival (OS) of the patients were recorded, and statistically compared with patients who had received only surgery and radiotherapy for glioblastoma during the same period.RESULTS Nineteen patients, who were diagnosed with glioblastoma for the first time, with a mean age of 51.2 years, were involved in this study.Radioactive seeds (8~20) were implanted into the tumor bed after tumorectomy with a mean surrounding therapeutic dose of 31.6 Gy, followed by an external irradiation dose of 42~54 Gy. The average TTP in the group with implanted seeds was 42.1±2.4 w (95% confidence interval, 37.2~46.5 w), and 27.1±2.7 w (95% confidence interval, 24.3~31.8 w) in the control group. The average OS was 66.3±3.2 w (95% confidence interval, 61.9~70.4 w) and 47.7±2.6 w (95% confidence interval, 44.4~50.5 w), respectively. Statistical analysis showed there was a significant difference between two groups.CONCLUSION The survival time of patients with glioblastoma can be prolonged through radioactive seed implantation at the time of operation.This therapeutic method can rapidly reduce the tumor volume with a minimum number of seeds to avoid excessive radiation exposure. Because of some shortcomings of this study, such as a small number of patients, and because implantation was performed under the naked eye so that the seed alignment could not be verified accurately, the experience of combining implantation of seeds with external irradiation needs to be investigated further.

  12. {sup 125}I seed implant brachytherapy for the treatment of parotid gland cancers in children and adolescents

    Energy Technology Data Exchange (ETDEWEB)

    Zheng, L.; Zhang, J.; Song, T.; Zhang, J.; Yu, G.; Zhang, Y. [Peking University School and Hospital of Stomatology, Beijing (China). Dept. of Oral and Maxillofacial Surgery

    2013-05-15

    Background and purpose: There is a lack of optimal treatment strategies for managing salivary gland cancers in children and adolescents. This study is aimed at assessing the effect of {sup 125}I seed implantation for the treatment of parotid cancers in children and adolescents. Patients and methods: A total of 12 patients younger than 16 years with parotid gland malignant tumors underwent {sup 125}I seed implant brachytherapy between October 2003 and November 2008. All patients were assessed after treatment and at the local tumor control appointments. Facial nerve function, maxillofacial development, and radioactive side-effects were assessed. Results: The follow-up period ranged from 41-104 months. One patient with T4b died of pulmonary metastasis. The other patients were alive during the follow-up period. There were no serious radiation-related complications. The treatment did not affect facial nerve function and dentofacial growth in any of the children. Conclusion: For parotid gland cancers in children, {sup 125}I seed implant brachytherapy may be an acceptable treatment without serious complications and with satisfactory short-term effects. (orig.)

  13. Treatment of Metastatic Spinal Tumors by Percutaneous Vertebroplasty versus Percutaneous Vertebroplasty Combined with Interstitial Implantation of 125I Seeds

    Energy Technology Data Exchange (ETDEWEB)

    Zuozhang Yang; Lin Xie; Yunchao Huang; Hongpu Sun; Pengjie Liu; Zhongxiong Wu (Dept. of Orthopedics, Tumor Hospital of Yunnan Province, Third Affiliated Hospital of Kunming Medical College, Kunming, Yunnan (China)). e-mail. yangzuozhang@163.com; Dakuan Yang (Second Affiliated Hospital of Kunming Medical College, Kunming Yunnan (China)); Yuqing Sun (Dept. of Orthopedic Oncology, Beijing Jishuitan Hospital, Beijing (China))

    2009-12-15

    Background: As the most frequent bone metastasis, spinal metastases cause severe pain and damage to vertebral bodies such as spinal osteolytic destruction and compression fractures. To avoid the trauma and complications of open surgery, a minimally invasive procedure, percutaneous vertebroplasty (PVP), has recently been developed to treat metastatic spinal tumors. Purpose: To analyze the treatment outcomes of metastatic spinal tumors by percutaneous vertebroplasty (PVP) alone or PVP combined with interstitial implantation of 125I seeds. Material and Methods: 80 patients with metastatic spinal tumors were randomized to receive PVP alone (40 cases) or PVP combined with 125I seed implantation (40 cases). Digital subtraction angiography (DSA)-guided vertebroplasty was performed under local anesthesia, and acrylic bone cement was injected into the vertebra through a bone trocar to the center of the lesion, with or without simultaneous interstitial implantation of 125I seeds. Results: At 6-month follow-up, PVP combined with 125I seed implantation resulted in zero cases with complete relief (CR), 36 with partial relief (PR), four with no changes (NC), and zero with progression of disease (PD), while PVP alone without seed implantation resulted in 0 CR, 31 PR, 7 NC, and 2 PD. While the combined-treatment group and the single-PVP group showed overall clinical benefit rates without significant difference (100% and 95.0%, respectively), their visual analogue pain scales (VAS; 2.26+-1.05 and 5.41+-0.94, respectively) and Karnofsky performance scores (KPS; 92.5+-7.1 and 87.7+-7.3, respectively) were significantly different after treatment (P = 0.028 and P = 0.009, respectively). Patients in both groups had 1-year follow-up, and the mean time to tumor progression (TTP) was 9.0 and 8.9 months, respectively (not significant). Conclusion: PVP is a minimally invasive procedure with small wounds and minor complications. It is effective in the alleviation of pain in metastatic spinal

  14. Study of treatment using percutaneous acetabuloplasty and interstitial implantation of 125I seeds for patients with metastatic periacetabular tumors

    Directory of Open Access Journals (Sweden)

    Zhang Jinlei

    2012-11-01

    Full Text Available Abstract Background The periacetabular area is one of the primary sites of metastatic tumors, which often present as osteolytic bone destruction. Bone destruction in the acetabulum caused by metastatic tumors will cause hip pain and joint dysfunction. It results in decreased quality of life for patients. The aim of our study was to explore the clinical effect of metastatic periacetabular tumors treated with percutaneous cementoplasty and interstitial implantation of 125I seeds. Methods A retrospective analysis was performed on 24 patients with metastatic periacetabular tumors who underwent combined therapy of percutaneous acetabuloplasty and interstitial implantation of 125I seeds between February 2003 and June 2011. There were 13 males and 11 females aged 19–80 years with a mean age of 57.3. The primary tumor site was the lung in eight cases, the breast in six, the prostate cancer in eight, and the liver in two. The amount of implanted 125I seeds was 12–20 seeds/person, with a mean of 16.5 seeds/person, and the matching peripheral dosage (MPD was 80~100Gy. Routine postoperative chemotherapy and other combined treatments were applied to patients after the surgical operation. Changes in the Karnofsky Score(KPS, Harris Hip Score(Harris, and Visual Analog Scale(VAS were observed during the follow-up period. Results The 24 patients’ operations were all successful. No major complications occurred. Complete pain relief was achieved in 58% (14 of 24 of patients, and pain reduction was achieved in the 42% remaining (10 patients. The mean duration of pain relief was 8.3 months. Pain recurred in one patient 3 months after surgery. Six patients had died and 18 patients were alive at the time of the 1-year follow-up. Comparing the KPS, Harris and VAS scores pre- and postoperativelyat 1, 6, and 12 months, the combined therapy method was significantly effective in metastatic periacetabular tumor patients (P Conclusions Percutaneous cementoplasty with

  15. 术中125I粒子植入治疗肿瘤的临床应用%The clinical application of 125I radionuclide implantation in tumor therapy

    Institute of Scientific and Technical Information of China (English)

    孙启和; 孙彬; 杨永青

    2010-01-01

    Objective To investigate the safety and clinical efficacy of permanent implantation of125I radioactive particle in the urgery of malignancies such as brain tumors,liver cancer,cholangiocarcinoma,lung cancer,prostate cancer and malignant teratoma.Methods Thirty eight patients proved by puncture biopsy,his-tology or cytology were retrospectively analyzed.Three-D images of the tumor were reconstructed using treat-ment planning system (TPS),the number and the dose rate distribution of 125I seeds were calculated.The matched eripheral dose of 125I seeds implantation was 60~120Gy,the number of 125I seeds implanted ranged from 6~40 per lesion,and the median amount of implanted 125I seeds were 23.Results Twelve months followup after the therapy showed 9 cases of complete relief,24 cases of partial relief and 5 cases of no change.The overall effective rate(complete relief+partial relief) of 12 months was 86.8%.Conclusion Permanent implantation of 125I radioactive particle in the surgery of malignancies treatment is a safe,effective treatment for tumors.%目的 探讨在手术中永久性植入125I粒子治疗脑瘤、肝癌、胆管癌、肺癌、直肠癌、前列腺癌及恶性畸胎瘤临床应用的安全性及疗效.方法 回顾性分析38例经穿刺活检、组织学或细胞学检查确诊的肿瘤患者,采用治疗计划系统(TPS)重建肿瘤的三维图像,计算出粒子植入的数量和剂量分布曲线,125I粒子治疗肿瘤处方剂量为60~120 Gy,每例植入粒子6~40颗,中位粒子数为23颗.结果 随访12个月,肿瘤完全缓解9例,部分缓解24例,无变化5例.12个月总有效率为86.8%.结论 术中植入125I粒子治疗肿瘤是一种安全、有效的方法.

  16. 125I implantation for carcinoma of prostate. Further follow-up of first 100 cases

    Energy Technology Data Exchange (ETDEWEB)

    Grossman, H.B.; Batata, M.; Hilaris, B.; Whitmore, W.F. Jr.

    1982-12-01

    Analysis of the first 100 patients at the Memorial Sloan-Kettering Cancer Center with Stage B or C prostatic cancer treated by pelvic lymph node dissection and Iodine-125 implantation and endocrine therapy when specifically indicated revealed five-year survival rates of 87 and 77 per cent, respectively. Tumor stage, tumor grade, and lymph node metastasis each correlated with survival, but the latter was the most significant factor. Although routine follow-up biopsies were not performed, local tumor control as judged by serial digital rectal examination defined a prognostically favored group of patients. In the absence of controls, however, whether the latter response indicates a salutary effect of the treatment which produces an improved survival or merely identifies a group of patients who were predetermined to have a more favorable survival is undetermined.

  17. 125I implantation for carcinoma of prostate. Further follow-up of first 100 cases.

    Science.gov (United States)

    Grossman, H B; Batata, M; Hilaris, B; Whitmore, W F

    1982-12-01

    Analysis of the first 100 patients at the Memorial Sloan-Kettering Cancer Center with Stage B or C prostatic cancer treated by pelvic lymph node dissection and Iodine-125 implantation and endocrine therapy when specifically indicated revealed five-year survival rates of 87 and 77 per cent, respectively. Tumor stage, tumor grade, and lymph node metastasis each correlated with survival, but the latter was the most significant factor. Although routine follow-up biopsies were not performed, local tumor control as judged by serial digital rectal examination defined a prognostically favored group of patients. In the absence of controls, however, whether the latter response indicates a salutary effect of the treatment which produces an improved survival or merely identifies a group of patients who were predetermined to have a more favorable survival is undetermined.

  18. Intra-operative dosimetry of trans-rectal ultrasound guided 125I prostate implants using C-arm fluoroscopic images

    Directory of Open Access Journals (Sweden)

    Ravindran Paul

    2006-01-01

    Full Text Available Permanent implantation of radioactive seeds is a viable and effective therapeutic option widely used today for early-stage prostate cancer. The implant technique has improved considerably during the recent years due to the use of image guidance; however, real-time dose distributions would allow potential cold spots to be assessed and additional seeds added. In this study, we investigate the use of a conventional C-arm fluoroscopy unit for image acquisition and evaluation of dose distribution immediately after the implant. The phantom study indicates that it is possible to obtain seed positions within ±2 mm. A pilot study carried out with three patients indicated that it is possible to obtain seed positions and calculate the dose distribution with C-arm fluoroscopy and about 95% of the seeds were reconstructed within ±2 mm. The results could be further improved with better digital imaging.

  19. Killing effect of EGFR-TKI combined with 125I seed implantation therapy onⅢB-Ⅳ stage lung cancer tissue

    Institute of Scientific and Technical Information of China (English)

    Ai-Sheng Xiang

    2016-01-01

    Objective:To analyze the killing effect of EGFR-TKI combined with 125I seed implantation therapy onⅢB-Ⅳ stage lung cancer tissue.Methods:A total of 78 patients withⅢB-Ⅳ stage lung cancer were randomly divided into observation group and control group (n=39), control group received EGFR-TKI treatment and observation group received EGFR-TKI combined with 125I seed implantation therapy. Differences in apoptosis gene, invasion gene and autophagy gene expression in lung tissue were compared between two groups after 1 month of treatment.Results:Apoptosis genesPDCD5, bax andbcl-xSmRNA expression levels in lung tissue of observation group after 1 month of treatment were higher than those of control group whileBag-1, survivin andbcl-xL mRNA expression levels were lower than those of control group; invasion genesCD147, EGFRandDDX17 mRNA expression levels were lower than those of control group while Bin1, E-cadherin andOvol2mRNA expression levels were higher than those of control group; autophagy genes ARHI, Beclin1, Atg5, LC3B, pULK andPI3KC3 mRNA expression levels were higher than those of control group.Conclusions: EGFR-TKI combined with 125I seed implantation therapy can enhance the tumor killing effect on patients withⅢB-Ⅳ stage lung cancer, and contribute to the optimization of overall condition and the extension of survival time.

  20. Influence of source batch Sk dispersion on dosimetry for prostate cancer treatment with permanent implants

    DEFF Research Database (Denmark)

    Nunez-Cumplido, Eduardo; Perez-Calatayud, J; Casares-Magaz, O;

    2015-01-01

    PURPOSE: In clinical practice, specific air kerma strength (SK) value is used in treatment planning system (TPS) permanent brachytherapy implant calculations with (125)I and (103)Pd sources; in fact, commercial TPS provide only one SK input value for all implanted sources and the certified shipment...... is to examine the impact of SK dispersion on typical implant parameters that are used to evaluate the dose volume histogram (DVH) for both planning target volume (PTV) and organs at risk (OARs). METHODS: The authors have developed a new algorithm to compute dose distributions with different SK values for each...... source. Three different prostate volumes (20, 30, and 40 cm(3)) were considered and two typical commercial sources of different radionuclides were used. Using a conventional TPS, clinically accepted calculations were made for (125)I sources; for the palladium, typical implants were simulated. To assess...

  1. [CT guidance (125)I seed implantation for pelvic recurrent rectal cancer assisted by 3D printing individual non-coplanar template].

    Science.gov (United States)

    Wang, H; Wang, J J; Jiang, Y L; Tian, S Q; Ji, Z; Guo, F X; Sun, H T; Fan, J H; Xu, Y P

    2016-12-20

    Objective: To analyze the difference of dosimetric parameters between pre-plan and post-plan of (125)I radioactive seed implantation assisted by 3D printing individual non-coplanar template (3D printing template) for locally recurrent rectal cancer (LRRC). Methods: From February 2016 to April 2016, a total of 10 patients with locally recurrent rectal cancer received (125)I seeds implantation under CT guidance assisted by 3D printing template in Department of Radiation Oncology, Peking University Third Hospital.Each patient underwent CT simulation, three-dimentional treatment planning pre-implantation, 3D printing template design, radioactive seed implantation assisted by 3D printing template and dosimetric verification post implantation. The median activity of seed was 0.63 mCi (0.58 to 0.7 mCi) (2.15- 2.59×10(7) Bq), and the median number of seeds was 80 (19 to 192). D90, D100, V100, V150, CI, EI, HI, D5cc, D2cc of bladder and bowel of pre-plan and post-plan were calculated, respectively.Paired t test was used to evaluate the difference of dosimetric parameters between pre-plan and post-plan. Results: The median D90 of pre-plan and post-plan were 13 761.0 and 12 798.8 cGy, respectively.The median D100 of pre-plan and post-plan were 5 293.6 and 5 397.9 cGy, respectively.The median V100 of pre-plan and post-plan were 90.0% and 90.0%, respectively.The median V150 of pre-plan and post-plan were 63.8% and 62.4%, respectively.The median CI of pre-plan and post-plan were 0.73 and 0.67.The median EI of pre-plan and post-plan were 0.22 and 0.30, respectively. The median HI of pre-plan and post-plan were 0.29 and 0.31.The median bladder D2cc of pre-plan and post-plan were 3 088.8 and 4 240.4 cGy, respectively.The median bowel D2cc of pre-plan and post-plan were 7 051.6 and 7 903.9 cGy, respectively. Conclusions: 3D printing template might be helpful for locally recurrent rectal cancer patients who received (125)I radioactive seed implantation assisted by 3D printing

  2. Methodology of quality control for brachytherapy {sup 125}I seeds

    Energy Technology Data Exchange (ETDEWEB)

    Moura, Eduardo S.; Zeituni, Carlos A.; Manzoli, Jose E.; Rostelato, Maria Elisa C.M. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)]. E-mail: esmoura@ipen.br

    2007-07-01

    This paper presents the methodology of quality control of {sup 125}I seeds used for brachytherapy. The {sup 125}I seeds are millimeter titanium capsules widely used in permanent implants of prostate cancer, allowing a high dose within the tumour and a low dose on the surrounding tissues, with very low harm to the other tissues. Besides, with this procedure, the patients have a low impotence rate and a small incidence of urinary incontinence. To meet the medical standards, an efficient quality control is necessary, showing values with the minimum uncertainness possible, concerning the seeds dimensions and their respective activities. The medical needles are used to insert the seeds inside the prostate. The needles used in brachytherapy have an internal diameter of 1.0 mm, so it is necessary {sup 125}I seeds with an external maximum diameter of 0.85 mm. For the seeds and the spacer positioning on the planning sheet, the seeds must have a length between 4.5 and 5.0 mm. The activities must not vary more than 5% in each batch of {sup 125}I seeds. For this methodology, we used two ionization chamber detectors and one caliper. In this paper, the methodology using one control batch with 75 seeds manufactured by GE Health care Ltd is presented. (author)

  3. Radiation protection after interstitial permanent prostate brachytherapy implants

    Energy Technology Data Exchange (ETDEWEB)

    Pirraco, R.; Pereira, A.; Cavaco, A. [Instituto Portugues de Oncologia Francisco Gentil - Centro R egional de Oncologia do Porto, SA, Porto (Portugal)

    2006-07-01

    Full text of publication follows: In this study we measure patients radiation exposure dose after interstitial {sup 125}I permanent prostate Brachytherapy implants, and correlate it with dose limits for public, total activity implanted, patient preoperative weight(1), distance between prostate walls and anterior skin surface. Methods and Material: We analyse 20 patients who were implanted with {sup 125}I seeds. The instrument used to measure radiation is a calibrated Berthold Umo LB 123 aco-plated to a LB 1236-H10 detector. Three measurements were taken: at the perineal and anterior pelvic zones on contact with the skin and at 1 m from the patient. The maximum value was taken for all measurements. The dose at a distance of one meter is obtained at anterior pelvic zone, perpendicular to the skin, according to the recommendations of A.A.P.M.(1). The distance between prostate walls was determined using post -operative CT images. Results: The doses at the perineal zone have determined an average of 186 {mu}Sv/h (range: 110 340 {mu}Sv/h) and at surface pelvic zone of 41 {mu}Sv/h (range: 15 103 {mu}Sv/h). The dose at a distance of 1 meter has an average value of 0.4 {mu}Sv/h (range: 0.2 1.0 {mu}Sv/h). The average total activity implanted was 25 mCi (range: 17 38 mCi). The distance between prostate walls and skin pelvic surface of the patients has an average value of 8.9 cm (range: 6.6 -11.5 cm). At a distance of 1 meter from the pelvic zone the dose measured is very low and below dose limits imposed by the European Directive EURATOM 2 and the Portuguese law. For general public to reach annual dose limit (EURATOM - 1 mSv/year) when contacting the pelvic zone, we extrapolate that 4 days (range: 1.6 11.1 days) would be needed, assuming a daily contact period of 6 hours. Conclusion: We established a correlation between the distance of prostate walls to the skin perineal surface and the total dose, but we find no correlation between measured doses, total activity implanted

  4. 前列腺癌131Cs和125I及103Pd粒子植入剂量学研究%Dosimetric study of permanent prostate brachytherapy utilizing 131Cs,125 I and103Pd seeds

    Institute of Scientific and Technical Information of China (English)

    杨瑞杰; 张红志; 王俊杰

    2009-01-01

    Objective To compare the dosimetric differences of permanent prostate braehytherapy utilizing 131Cs,125 I and 103 Pd seeds.Methods Twenty-five patients with T1-T2c prostate cancer who had previously implanted with 125I seeds were randomly selected in our study.The patients were re-planned with 131 Cs,125 I and 103 Pd seeds by using the Prowess Brachytherpay 3.1 planning system to the prescription doses of 115 Gy,145 Gy and 125 Gy,respectively.The seed strengths were 1.8 U,0.5 U and 1.8 U,respeetively. The prostate,prostatic urethra and anterior wall of the rectum were contoured on trans-rectal ultrasound ima ges.PTV was outlined based on the prostate volume with no margin applied.The attempted planning goals were that V100(tbe percentage volume of the prostate receiving at least 100% of the prescription doses)= 95%,D90 (the minimum percentage dose covering 90% of the prostate volume) ≥100% ,and prostatic ure thra UD10 (the maximum percentage dose receiving by 10% of the contoured urethra)≤150%.For the plan comparison,we also computed prostate V150,prostatic urethra UV120,rectum RV100,and the number of implan ted seeds and needles.The significance of the differences was tested using one way analysis of variance. Results The average V200 in the 103pd,125 I and 131 Cs plans were 28.7% ,20.9% and 19.6% (F=42.50, P =0.000) ;the average V150 were 51.9% ,42.1% and 39.4% (F=26.15,P =0.000) ;the average UV120 were 26.9% ,29.5% and 23.8% (F = 0.37,P =0.691) ; and the average rectum RV100 were 0.31 cm3, 0.22 cm3 and 0.19 cm3(F=0.43,P=0.652).For 103 Pd,124 I and 131 Cs,the average number of implanted seeds per cm3 prostate were 2.02,2.01 and 1.87(F = 1.92 ,P =0.154) ,and the average number of needles were 33.6,32.9 and 31.6(F=0.26,P=0.772). Conclusions Comparing to 124 I and 103 pd seeds used in permanent prostate brachytherapy ,131 Cs seeds has better dose homogeneity,and possible better sparing of the urethra and rectum,with comparable or less implanted seeds and needles

  5. Occupational exposure of professionals during interstitial permanent prostate brachytherapy implants

    Energy Technology Data Exchange (ETDEWEB)

    Pirraco, R.; Pereira, A.; Viterbo, T.; Cavaco, A. [Instituto Portugues de Oncologia Francisco Gentil, Centro R egional de Oncologia do Porto, SA, Porto (Portugal)

    2006-07-01

    Full text of publication follows: Introduction: In this study we present dose measurements for professionals exposed during interstitial 125 I permanent prostate brachytherapy implants. Methods and Materials: The implant technique used was intra operative real time using strand and loose seeds. The professionals inside the operating room are an oncologist, a radiologist, a physicist, a nurse and an anesthesiologist. The oncologist and the physicist contact directly the loaded needle with radioactive seeds and two types of measurements were taken: total body and extremities (finger) dose. The rest of the team operates at long distances, but measurements were made. To measure total body equivalent dose we use a Berthold Umo LB 123 coupled with a LB 1236-H10 detector, and we recorded dose, time and distance from implant location. Finger dosemeters are thermo -luminescent dosimeter (TLD) rings that were controlled over one month. Results: 50 cases (average number of applications per year) were analysed for extremities measurements and 9 cases for total body measurements (in this case, the results were extrapolated for 50 cases), with an average of 26.1 mCi total activity per implant (in a range of 17.4 - 40.3 mCi). The finger dose was 1.8 mSv for the oncologist and 1.9 mSv for the physicist. The interpolation of total body equivalent dose for the oncologist was 24 mSv, for the radiologist 6 mSv and 9 mSv for the physicist. The rest of the team did not receive anything but background radiation. The annual national limit dose for workers is 20 mSv for total body irradiation, and 500 mSv for extremities. Conclusion: In conclusion we may say that during interstitial permanent prostate brachytherapy implants, total doses received for all groups are not significant when compared to annual limits for Portuguese laws 1. Even so, our main goal is always to get the less possible dose (ALARA principle). References: 1. Decreto Lei n. 180/2002 de 8 de Agosto. (authors)

  6. 应用125I粒子植入术治疗眼部肿瘤的临床观察%Clinical observation of 125I seed implantation for the treatment of ocular tumor

    Institute of Scientific and Technical Information of China (English)

    刘白雪; 张珂; 朱豫

    2016-01-01

    目的 观察125I粒子植入治疗眼部肿瘤的可行性、安全性及效果.方法 眼部肿瘤行直视下125I粒子植入术19例,并对其中3例可疑肿瘤扩散者行MRI或CT导航定位下125I粒子补种.19例粒子植入术均按术前计划完成.其中14例1次植入,3例行2次植入,1例行3次植入,1例4次植入.结果 术后观察2周~8年,平均(26.55±5.46)个月.19例中局部病变控制无复发者14例(73.68%);发现新病灶或病变扩散而经补种粒子病变控制者5例(26.32%).未出现病变转移者.19例中除3例(15.79%)眼睑轻度肿胀和少许皮下出血外,其余均未发生与植入手术操作相关的并发症.其他并发症有以下几种:125I粒子放置于眶前中部者1~3个月出现流泪、痒感、分泌物增多、结膜充血及上皮化,6个月后均自动消失;睫毛于1~3个月内可见脱落,4~6个月缓慢生长,6个月后恢复正常;1例粒子植入位置表浅,出现皮肤破溃及瘘管形成,抗炎对症治疗1周后恢复正常.植入泪腺区者:植入后发生干眼1例,6个月后恢复.植入眶中后部者:9个月术后出现组织纤维化、硬化,皮肤色素沉着.并发症均为可恢复性,眼前部并发症一般于术后6个月(3个半衰期)消失.结论 125I粒子植入治疗眼部肿瘤创伤小,疗效确切,并发症少,能最大限度保留视功能及外观,其可行性、安全性及疗效是肯定的.%Objective To observe the feasibiliy,safety and efficacy of 125 I seed implantation for the treatment of ocular tumor.Methods Nineteen patients received 125I seed implantation through intraoperative direct vision.In which 3 patients who had tumor spread received secondary 125I seed implantation through CT or MRI guiding.Nineteen patients received the operation successfully according to the preoperative plan.Fourteen cases were implanted 125I seed once,three cases received twice implantation,one case received implantation for three times,and one case received

  7. 78 FR 41125 - Interim Enforcement Policy for Permanent Implant Brachytherapy Medical Event Reporting

    Science.gov (United States)

    2013-07-09

    ... COMMISSION Interim Enforcement Policy for Permanent Implant Brachytherapy Medical Event Reporting AGENCY... Commission (NRC) is issuing an interim Enforcement Policy that allows the staff to exercise enforcement...'s permanent implant brachytherapy program. This interim policy affects NRC licensees that...

  8. An analysis of brachytherapy with computed tomography-guided permanent implantation of Iodine-125 seeds for recurrent nonkeratin nasopharyngeal carcinoma

    Directory of Open Access Journals (Sweden)

    Shen X

    2015-05-01

    Full Text Available Xinying Shen,1,2 Yong Li,2 Yanfang Zhang,2 Jian Kong,2 Yanhao Li1 1Department of Interventional Radiology, Nanfang Hospital, Southern Medical University, Guangzhou, 2Department of Interventional Radiology, Shenzhen People’s Hospital, The Second Clinical Medical College of Jinan University, Shenzhen, People’s Republic of China Background: 125I seed implantation is a new method in treatment of nasopharyngeal carcinoma (NPC, and it is worthwhile to evaluate its feasibility. In this study, we performed brachytherapy with computed tomography (CT-guided permanent implantation of 125I seeds in the treatment of patients with the recurrence of NPC.Methods: A total 30 patients (20 male and ten female at the median age of 55 (range 25–80 years were diagnosed with recurrent nonkeratin NPC, with a total 38 lesions and a short disease-free interval (median ~11 months after primary radiotherapy alone or combined with chemotherapy. Patients received CT scan, starting from 2 months after the treatment. Follow-up was conducted for ~2–38 months to observe the local control rate and overall survival rate. We also analyzed the possible correlation between survival periods and the status of recurrent tumors.Results: The local control rates at 6, 12, 24, 30, and 36 months after the procedure of 125I seed implantation were 86.8%, 73.7%, 26.3%, 15.8%, and 5.3%, respectively. The overall 1-, 2-, and 3-year survival rates were 80.0% (24/30, 30.0% (9/30, and 6.7% (2/30, respectively, with a median survival period of 18 months (17.6±8.6 months. Interestingly, the survival periods of the patients who had primary radiotherapy with or without chemotherapy were 15.8±7.9 and 24.3±7.9 months, respectively. Kaplan–Meier survival analysis demonstrated that χ2 (log rank was 7.555, with very significant difference (P<0.01. The survival periods of patients in tumor stages I, II, III, and IV were 25.4±8.7, 19.8±9.4, 16.1±4.5, and 12.8±7.8 months, respectively, with

  9. The effect of metal detector gates on implanted permanent pacemakers.

    Science.gov (United States)

    Copperman, Y; Zarfati, D; Laniado, S

    1988-10-01

    The effect of metal detector security gates, such as are used in airports, was tested in 103 nonselected pacemaker patients. Various types of single and dual chamber units were examined, using telemetry during the test. Pulse rate and duration were measured immediately before and after the procedure. No ill effect was seen on any of the units tested, pacemaker inhibition was not observed, and programmability was not affected. Metal detector security gates have no effect on implanted permanent pacemakers.

  10. 3D打印模板引导125I粒子植入术前术后剂量对比%Dose comparison between pre and post operation of 125I seeds implantation guided by 3D print tamplate

    Institute of Scientific and Technical Information of China (English)

    张宏涛; 底学敏; 于慧敏; 赵宪芝; 张利娟; 赵金鑫; 张琛; 刘泽洲; 隋爱霞

    2016-01-01

    目的 比较3D打印模板引导粒子植入术前术后剂量差异,探讨其剂量的准确性.方法 选取2015年8至11月于河北省人民医院实施3D打印模板引导粒子植入患者9例,术前手术体位固定患者扫描CT,行术前计划后打印3D模板,术中按模板预设针道位置穿刺肿瘤,扫描CT确定针尖位置无误后按术前计划植入粒子,术后行验证计划.观察手术前后的90%靶体积的最小吸收剂量(D90)、90%处方剂量覆盖的体积占靶体积的百分比(V90)、V100、V150及粒子数目有无差异.结果 术前D90、V90、V100、V150及粒子数目分别为(7 684±3 279) cGy、93.2%±0.8%、89.8%±0.9%、62.8%±4.7%、(58±17)颗.术后D90、V90、V100、V150及粒子数目分别为(7 531 ±3 523)cGy、92.4%±2.0%、88.0%±2.5%、61.9%±5.3%、(56±17)颗.各指标手术前后比较差异均无统计学意义(均P >0.05).结论 3D打印模板引导粒子植入术后剂量指标与术前比较无差别,对于比较固定的肿瘤,可能成为重复性好的标准术式.%Objective To compare the dose difference between pre and post operation of 125I seeds implantation guided by 3D print tamplate and investigate the dose accuracy.Methods From August 2015 to November2015,a total of 9 patients were selected and underwent 3D print tamplate guided 125I seeds implantation in Hebei General Hospital.All patients had been fixed as the position of operation and then performed CT scan.After preplan was designed,the 3D tamplates were printed.The tumors were punctured through needles holes predesigned.Another CT scan was used to confirm the locations of needles and then seeds were implanted into tumor according to preplan.Postplan was performed after the operation.The D90,V90,V100,V150 and seeds number pre and post operation were collected and compared.Results The mean D90,V90,V100,V150 and seeds number preoperation was (7 684 ±3 279)cGy,93.2% ±0.8%,89.8% ±0.9%,62.8% ±4.7

  11. SU-E-T-123: Anomalous Altitude Effect in Permanent Implant Brachytherapy Seeds

    Energy Technology Data Exchange (ETDEWEB)

    Watt, E; Spencer, DP; Meyer, T [University of Calgary and Tom Baker Cancer Centre, Calgary, AB (Canada)

    2015-06-15

    Purpose: Permanent seed implant brachytherapy procedures require the measurement of the air kerma strength of seeds prior to implant. This is typically accomplished using a well-type ionization chamber. Previous measurements (Griffin et al., 2005; Bohm et al., 2005) of several low-energy seeds using the air-communicating HDR 1000 Plus chamber have demonstrated that the standard temperature-pressure correction factor, P{sub TP}, may overcompensate for air density changes induced by altitude variations by up to 18%. The purpose of this work is to present empirical correction factors for two clinically-used seeds (IsoAid ADVANTAGE™ {sup 103}Pd and Nucletron selectSeed {sup 125}I) for which empirical altitude correction factors do not yet exist in the literature when measured with the HDR 1000 Plus chamber. Methods: An in-house constructed pressure vessel containing the HDR 1000 Plus well chamber and a digital barometer/thermometer was pumped or evacuated, as appropriate, to a variety of pressures from 725 to 1075 mbar. Current measurements, corrected with P{sub TP}, were acquired for each seed at these pressures and normalized to the reading at ‘standard’ pressure (1013.25 mbar). Results: Measurements in this study have shown that utilization of P{sub TP} can overcompensate in the corrected current reading by up to 20% and 17% for the IsoAid Pd-103 and the Nucletron I-125 seed respectively. Compared to literature correction factors for other seed models, the correction factors in this study diverge by up to 2.6% and 3.0% for iodine (with silver) and palladium respectively, indicating the need for seed-specific factors. Conclusion: The use of seed specific altitude correction factors can reduce uncertainty in the determination of air kerma strength. The empirical correction factors determined in this work can be applied in clinical quality assurance measurements of air kerma strength for two previously unpublished seed designs (IsoAid ADVANTAGE™ {sup 103}Pd and

  12. Novel Silicone-Coated 125I Seeds for the Treatment of Extrahepatic Cholangiocarcinoma.

    Science.gov (United States)

    Lin, Lizhou; Guo, Lili; Zhang, Weixing; Cai, Xiaobo; Chen, Dafan; Wan, Xinjian

    2016-01-01

    125I seeds coated with titanium are considered a safe and effective interstitial brachytherapy for tumors, while the cost of 125I seeds is a major problem for the patients implanting lots of seeds. The aim of this paper was to develop a novel silicone coating for 125I seeds with a lower cost. In order to show the radionuclide utilization ratio, the silicone was coated onto the seeds using the electro-spinning method and the radioactivity was evaluated, then the anti-tumor efficacy of silicone 125I seeds was compared with titanium 125I seeds. The seeds were divided into four groups: A (control), B (pure silicone), C (silicone 125I), D (titanium 125I) at 2 Gy or 4 Gy. Their anti-tumour activity and mechanism were assessed in vitro and in vivo using a human extrahepatic cholangiocarcinoma cell line FRH-0201 and tumor-bearing BALB/c nude mice. The silicone 125I seeds showed higher radioactivity; the rate of cell apoptosis in vitro and the histopathology in vivo demonstrated that the silicone 125I seeds shared similar anti-tumor efficacy with the titanium 125I seeds for the treatment of extrahepatic cholangiocarcinoma, while they have a much lower cost.

  13. Reevaluation of the indications for permanent pacemaker implantation after transcatheter aortic valve implantation

    DEFF Research Database (Denmark)

    Bjerre Thygesen, Julie; Loh, Poay Huan; Cholteesupachai, Jiranut

    2014-01-01

    AIMS: Conduction abnormalities (CA) requiring permanent pacemaker (PPM) are a well-known complication after transcatheter aortic valve implantation (TAVI). This study aimed to determine the incidence of TAVI-related PPM and reevaluate the indications for PPM after the periprocedural period. METHO...

  14. Routine chest radiography after permanent pacemaker implantation: Is it necessary?

    Directory of Open Access Journals (Sweden)

    Edwards N

    2005-01-01

    Full Text Available Background and Aims: Chest radiographs (CXRs are performed routinely after permanent pacemaker implantation to identify pacemaker lead position and exclude pneumothorax. We assessed the clinical value and need for this procedure. Design: Retrospective analysis of pacemaker data and CXRs following permanent pacemaker insertion between December 2002 and February 2004. Materials and Methods: Post-procedural CXRs were available in 125/126 consecutive patients after either first endocardial pacemaker implantation or insertion of at least one new lead. Subclavian vein puncture was used for venous access in all cases. CXRs were examined to establish the incidence of pneumothorax and assess pacing lead positions. The clinical records were examined in all patients who had subsequent CXRs or a further pacemaker procedure to identify the indication for these and to establish whether CXR had influenced patient management. Results: In total, 192 post-procedural CXRs were performed, either postero-anterior (PA and/or lateral views. Ventricular and/or atrial pacing lead contour and electrode position was considered radiographically appropriate in 86% CXRs. Fourteen per cent of post-procedural radiographs were considered to have radiologically sub-optimal pacemaker lead positioning. None of the patients with these "abnormal" radiographs experienced subsequent pacemaker complications or had further radiographs recorded at a later date. Later repeat CXRs were performed in 16 patients (13% but only 3 patients (2% had pacing abnormalities as the primary indication. All three had satisfactory pacing lead position on initial post-implantation and later radiographs, but required further procedures for lead re-positioning. Iatrogenic pneumothorax occurred in one patient (incidence 0.8% in our series. CXR confirmed the clinical diagnosis and allowed an assessment of size to guide treatment. Conclusion: Routine CXR after permanent pacemaker insertion is not necessary in

  15. Urethral dose and increment of international prostate symptom score (IPSS) in transperineal permanent interstitial implant (TPI) of prostate cancer

    Energy Technology Data Exchange (ETDEWEB)

    Murakami, N.; Itami, J. [Dept. of Radiation Therapy and Oncology, International Medical Center of Japan, Tokyo (Japan); Div. of Radiation Therapy, National Cancer Center Hospital, Tokyo (Japan); Okuma, K.; Marino, H.; Ban, T.; Nakazato, M.; Kanai, K.; Naoi, K.; Fuse, M. [Dept. of Radiation Therapy and Oncology, International Medical Center of Japan, Tokyo (Japan); Nakagawa, K. [Dept. of Radiology, School of Medicine, Tokyo Univ. (Japan)

    2008-10-15

    Purpose: to find the factors which influence the acute increment of international prostate symptom score (IPSS) after transperineal permanent interstitial implant (TPI) using {sup 125}I seeds. Patients and methods: from April 2004 through September 2006, 104 patients with nonmetastatic prostate cancer underwent TPI without external-beam irradiation. Median patient age was 70 years with a median follow-up of 13.0 months. 73 patients (70%) received neoadjuvant hormone therapy. The increment of IPSS was defined as the difference between pre- and postimplant maximal IPSS. Clinical, treatment, and dosimetric parameters evaluated included age, initial prostate-specific antigen, Gleason Score, neoadjuvant hormone therapy, initial IPSS, post-TPI prostatic volume, number of implanted seeds, prostate V{sub 100}, V{sub 150}, D{sub 90}, urethral D{sub max}, and urethral D{sub 90}. In order to further evaluate detailed urethral doses, the base and apical urethra were defined and the dosimetric parameters were calculated. Results: the IPSS peaked 3 months after TPI and returned to baseline at 12-15 months. Multivariate analysis demonstrated a statistically significant correlation of post-TPI prostatic volume, number of implanted seeds, and the dosimetric parameters of the base urethra with IPSS increment. Conclusion: the base urethra appears to be susceptible to radiation and the increased dose to this region deteriorates IPSS. It remains unclear whether the base urethral dose relates to the incidence of late urinary morbidities. (orig.)

  16. Reevaluation of the indications for permanent pacemaker implantation after transcatheter aortic valve implantation

    DEFF Research Database (Denmark)

    Bjerre Thygesen, Julie; Loh, Poay Huan; Cholteesupachai, Jiranut;

    2014-01-01

    AIMS: Conduction abnormalities (CA) requiring permanent pacemaker (PPM) are a well-known complication after transcatheter aortic valve implantation (TAVI). This study aimed to determine the incidence of TAVI-related PPM and reevaluate the indications for PPM after the periprocedural period. METHODS...... AND RESULTS: A total of 258 consecutive patients underwent TAVI with the Medtronic CoreValve (MCV), whereas 24 patients were excluded from the study. TAVI-related PPM was defined as PPM implantation ≤30 days after the procedure and due to atrioventricular block (AVB). Third-degree AVB, second-degree type......-II, or advanced second-degree AVB were considered as absolute indications for PPM. The incidence of TAVI-related PPM implantation was 27.4%. Forty-six patients (19.7%) had an absolute indication for PPM, but CA had resolved in 50% beyond the periprocedural period. Electrocardiographic analysis of the patients who...

  17. Feasibility of 3 D print individual template combined with CT-guided 125 I seed implantation for malignant tumors%3 D打印个体化模板联合CT引导125 I粒子植入治疗恶性肿瘤质量评价

    Institute of Scientific and Technical Information of China (English)

    张颖; 林琦; 袁苑; 戴建建; 耿宝成; 徐瑞彩; 刘亚坤; 韩明勇

    2016-01-01

    Objective To evaluate the feasibility of 3 D print individual template and CT-guided 125 I seed implantation for malignant tumors.Methods A total of 30 patients were involved in this study.Before 125 I seed implantation,the patients received CT simulation orientation as the predicted posture.The individual template was designed by the brachytherapy treatment planning system (BTPS),and printed by 3D print technique.Every patient received 125 I seed implantation under the guidance of 3 D print individual template and CT scan.After implantation,treatment quality was evaluated with CT and BTPS.Results The 3D print individual templates were successfully designed and manufac-tured.Of all 30 cases,28 were successfully implanted with the 3 D print templates,and 2 failed.Of the 28 successful cases,22 had the same number of seeds implanted as scheduled before operation,and the other 6 cases optimized the number of seeds during operation.Postoperative evaluation indicated that 14 (50.0%)cases had excellent implants,10 (35.7%)had good implants,4 (14.3%)had suboptimal implants,and no case had poor implants.Conclusion The 3 D print individual template and CT-guided 125 I seed implantation appears to be a feasible,safe and effective modality for the treatment of malignant tumors.%目的:对3 D打印个体化模板联合CT引导125 I粒子植入术后验证的剂量学参数进行评价,探讨其治疗肿瘤的可行性。方法收集2015年12月至2016年7月住院患者30例,全部患者术前行CT模拟定位,设计并应用3D打印机打印个体化模板。手术时,将患者进行复位、模板与体表术区对合、按术前计划进针、植入粒子,术后即刻行CT扫描,进行剂量学验证。按照英国哥伦比亚癌症研究中心粒子植入质量评价标准对植入质量进行评价。结果30例患者均成功设计并打印个体化模板。28例技术成功,其中22例患者术后实际植入粒子数与术前计划一致,另外6例给

  18. 肺癌术中植入125I对周围器官损伤的基础研究%Basic study of damage of the implanted radioactive 125I seeds to peripheral organ in surgical operation for lung cancer

    Institute of Scientific and Technical Information of China (English)

    李纪远; 马建群; 马新; 张金峰; 郎耀国

    2016-01-01

    Objective To investigate the effect and safety of implanted radioactive 125I seed on normal tissue structure of esophagus and trachea in dogs.Methods Six healthy male dogs weighing 15 to 20 kg were randomly divided into two group:group Ⅰ (killed 2 months later) and group Ⅱ (killed 4 months later),with 3 dogs in each groups,the design radioactive seeds were transplanted by the side(equilateral triangle) of esophagus and trachea.According to grouping situation,taking the organizations after transplanting to carry on the dyeing of HE,the pathologic variety of the organization under light microscope and the electron microscope were observed.The tumor invasion,residual or local lymph node metastasis were observed in 15 patients,intraoperative implantation of 125I.Results There were no significant complications such as stenosis,perforation,edema and necrosis of the trachea or esophagus.The light microscope showed that soaked inflammation cells occur in the artery membrane in all dogs and the electronmicroscope showed that the damage of ultrastructure were primary,but the degree of damage was reversibility.There were no serious complications after implantation of 125I.Conclusions Radioactive 125I seed has little harm on normal tissue structure of esophagus and trachea,although it is safe,implanting radioactive particle 125I should be cautious near 20 mm range of esophagus and trachea because of the damages.%目的 研究放射性125I粒子植入对犬正常气管、食管组织结构的影响及其安全性.方法 选择健康雄性普通杂种犬6只,体质量10 ~20 kg,随机分为Ⅰ组(2个月后处死)和Ⅱ组(4个月后处死),每组3只.放射性125I粒子呈三角形植入犬气管、食管旁.根据分组情况取材,包埋蜡块进行HE染色光镜观察以及电镜观察损伤情况.15例患者术中见肿瘤外侵,残留或局部淋巴结转移,在靶区植入125I.结果 气管、食管管腔无明显增厚狭窄、穿孔、充血水肿坏死等并发

  19. 超声引导下经直肠途径125I粒子植入术后急性尿潴留的影响因素分析%The influence factors of acute urinary retention after 125 I particles implantation via a rectal way guided by ultrasound

    Institute of Scientific and Technical Information of China (English)

    郭道宁; 漆家高; 刘强; 辛宇鹏; 范俊; 邹晓攀

    2015-01-01

    目的:探讨直肠超声(transrectal ultrasonography,TRUS)引导下经直肠途径植入125 I 粒子治疗前列腺癌术后并发的急性尿潴留及其影响因素。方法298例前列腺癌患者,在 TRUS 引导下经直肠途径植入125 I 粒子,术后随访穿刺相关并发症及临床疗效,分析年龄、肿瘤分期、术前前列腺特异性抗原(PSA)、Gleason 评分、国际前列腺评分(IPSS)、前列腺体积、中叶增大、突入膀胱、穿刺针数和植入的粒子数等对术后急性尿潴留的影响。结果术后1~7d 出现急性尿潴留19例(6.4%),经导尿2~5 d 后拨管无再次发生;术后急性尿潴留与前列腺体积、突入膀胱有关(P =0.001;P =0.041)。结论TRUS 引导经直肠途径125 I 粒子植入治疗前列腺癌术后并发急性尿潴留较少、较轻微,前列腺体积、突入膀胱是术后急性尿潴留的主要影响因素。%Objective To explore the influence factors of acute urinary retention after 125 I particles implantation via a rectal way guided by transrectal ultrasonography (TRUS).Methods Two hundred and ninety-eight patients with prostate cancer were implan -ted with 125 I particles via a rectal way under the TRUS.The clinical efficacy and related complications after operation were followed -up to analyze the effects of age,tumor stage,preoperative PSA,Gleason score,IPSS score,prostate volume,increased middle lobes of the prostate,protruding into bladder,number of puncture and number of implanted particles on the postoperative acute urinary retention .Re-sults There were 19 cases(6.4%) suffered from acute urinary retention after 1 to 7 days of operation.However,no recurrence was found after treatment with urethral catheterization for 2 ~5 days.Postoperative acute urinary retention was associated with prostate vol -ume and protruding into the bladder (P=0.001 and P=0.041,respectively).Conclusion The acute urinary retention occurs less and

  20. Occupational exposure in prostate permanent implants with I-125 seeds

    Energy Technology Data Exchange (ETDEWEB)

    Fdez Garcia, J.; Luna, V.; Sancho, J. M. g.; Martinez, J.; Galiano, P. S.; Jimenez, I.; Prada, P.; Juan, G.; Vivanco, J.

    2002-07-01

    Prostate brachytherapy is one of the techniques increasing faster in the environment of the radiotherapy and will probably go on increasing in the future. There are two forms in their use; by means of remote afterloading high dose rate (HDR) with Ir-192 radioactive sources or by means of permanent implant by manual/automatic afterloading of low dose rate (LDR) with seeds of I-125 or Pd-103. Iodine-125 has a half life of 59.4 days and it decays by electron capture with emissions of characteristic photons and electrons. The electrons are absorbed by the titanium wall of the I-125 seed. The principal photon emissions are 27.4 and 31.4 keV X-rays and a 35.5 keV gamma ray. Besides 22.1 and 25.2 keV fluorescent X-rays are also emitted resulting from interactions of the iodine-125 photons with the silver rod. The resulting average photon energy is approximately 27.4 keV. (Author)

  1. Continuous and low-energy 125I seed irradiation changes DNA methyltransferases expression patterns and inhibits pancreatic cancer tumor growth

    Directory of Open Access Journals (Sweden)

    Gong Yan-fang

    2011-04-01

    Full Text Available Abstract Background Iodine 125 (125I seed irradiation is an effective treatment for unresectable pancreatic cancers. However, the radiobiological mechanisms underlying brachytherapy remain unclear. Therefore, we investigated the influence of continuous and low-energy 125I irradiation on apoptosis, expression of DNA methyltransferases (DNMTs and cell growth in pancreatic cancers. Materials and methods For in vitro 125I seed irradiation, SW-1990 cells were divided into three groups: control (0 Gy, 2 Gy, and 4 Gy. To create an animal model of pancreatic cancer, the SW 1990 cells were surgically implanted into the mouse pancreas. At 10 d post-implantation, the 30 mice with pancreatic cancer underwent 125I seed implantation and were separated into three groups: 0 Gy, 2 Gy, and 4 Gy group. At 48 or 72 h after irradiation, apoptosis was detected by flow cytometry; changes in DNMTs mRNA and protein expression were assessed by real-time PCR and western blotting analysis, respectively. At 28 d after 125I seed implantation, in vivo apoptosis was evaluated with TUNEL staining, while DNMTs protein expression was detected with immunohistochemical staining. The tumor volume was measured 0 and 28 d after 125I seed implantation. Results 125I seed irradiation induced significant apoptosis, especially at 4 Gy. DNMT1 and DNMT3b mRNA and protein expression were substantially higher in the 2 Gy group than in the control group. Conversely, the 4 Gy cell group exhibited significantly decreased DNMT3b mRNA and protein expression relative to the control group. There were substantially more TUNEL positive in the 125I seed implantation treatment group than in the control group, especially at 4 Gy. The 4 Gy seed implantation group showed weaker staining for DNMT1 and DNMT3b protein relative to the control group. Consequently, 125I seed implantation inhibited cancer growth and reduced cancer volume. Conclusion 125I seed implantation kills pancreatic cancer cells, especially

  2. 微波消融联合125I粒子植入治疗腹腔恶性软组织肿瘤的临床观察%CT-guided 125 I radioactive seeds implantation and microwave ablation for treatment of intraperitoneal soft tissue sarcomas

    Institute of Scientific and Technical Information of China (English)

    吴孟孟; 孙亚红; 宋鹏远; 盛立军

    2016-01-01

    OBJECTIVE Soft tissue sarcoma has high recurrence and metastatic rate,and it is difficult to find a uni-fied treatment program after recurrence and metastasis.The aim of this paper was to investigate the safety,efficacy,and clinical value of CT-guided percutaneous microwave ablation combined with 125 I radioactive seeds implantation for the treatment of intraperitoneal soft tissue sarcomas.METHODS A retrospective study included 25 patients with intraperito-neal soft tissue sarcomas in Affiliated Hospital of Shandong Academy of Medical Sciences from February 1,2013 to March 1,2015.All patients received microwave ablation,followed by CT review one week later.With the help of TPS treatment planning system,implantation of 125 I seeds was performed as planned.Therapeutic effects and patients’follow-up survival rate were assessed according to WHO Response Evaluation Criteria in Solid Tumors.RESULTS Operations were com-pleted in 25 patients.Progression-free survival (PFS)was 5 months,with 6 cases of complete remission (CR),10 cases of partial response (PR),7 cases of stable disease (SD),and 2 cases of progressive disease (PD).The response rate (RR) was 64% and disease control rate (DCR)was 92%.The case of severe postoperative complications was 0/25.Twenty-four patients are still alive now.The longest followed span was 32 months,and the shortest was 6 months.The average survival period was 14 months,1 cases of death.CONCLUSION CT-guided percutaneous microwave ablation combined with 125 I radioactive seeds implantation is a minimally invasive,safe and effective treatment method for intraperitoneal soft tissue sarcomas.%目的:软组织肿瘤复发率及转移率高,复发或转移后没有统一的治疗方案。探讨 CT 引导下经皮穿刺微波消融术联合125 I 粒子植入治疗腹腔恶性软组织肿瘤的安全性、有效性及应用价值。方法回顾性分析山东省医学科学院附属医院2013-02-01-2015-03-01收治的25例腹腔恶性软组

  3. [Intraoperative and post-implant dosimetry in patients treated with permanent prostate implant brachytherapy].

    Science.gov (United States)

    Herein, András; Ágoston, Péter; Szabó, Zoltán; Jorgo, Kliton; Markgruber, Balázs; Pesznyák, Csilla; Polgár, Csaba; Major, Tibor

    2015-06-01

    The purpose of our work was to compare intraoperative and four-week post-implant dosimetry for loose and stranded seed implants for permanent prostate implant brachytherapy. In our institute low-dose-rate (LDR) prostate brachytherapy is performed with encapsulated I-125 isotopes (seeds) using transrectal ultrasound guidance and metal needles. The SPOT PRO 3.1 (Elekta, Sweden) system is used for treatment planning. In this study the first 79 patients were treated with loose seed (LS) technique, the consecutive patients were treated with stranded seed (SS) technique. During intraoperative planning the dose constraints were the same for both techniques. All LSs were placed inside the prostate capsule, while with SS a 2 mm margin around the prostate was allowed for seed positioning. The prescribed dose for the prostate was 145 Gy. This study investigated prostate dose coverage in 30-30 randomly selected patients with LS and SS. Four weeks after the implantation native CT and MRI were done and CT/MRI image fusion was performed. The target was contoured on MRI and the plan was prepared on CT data. To assess the treatment plan dose-volume histograms were used. For the target coverage V100, V90, D90, D100, for the dose inhomogeneity V150, V200, and the dose-homogeneity index (DHI), for dose conformality the conformal index (COIN) were calculated. Intraoperative and postimplant plans were compared. The mean V100 values decreased at four-week plan for SS (97% vs. 84%) and for LS (96% vs. 80%) technique, as well. Decrease was observed for all parameters except for the DHI value. The DHI increased for SS (0.38 vs. 0.41) and for LS (0.38 vs. 0.47) technique, as well. The COIN decreased for both techniques at four-week plan (SS: 0.63 vs. 0.57; LS: 0.67 vs. 0.50). All differences were significant except for the DHI value at SS technique. The percentage changes were not significant, except the COIN value. The dose coverage of the target decreased significantly at four-week plans

  4. 支气管动脉化疗栓塞联合125I放射性粒子植入术治疗老年非小细胞肺癌的效果分析%Effect analysis of bronchial arterial chemoembolization combined with 125I active particle implantation in the treatment of elderly non-small cell lung cancer

    Institute of Scientific and Technical Information of China (English)

    杨海

    2015-01-01

    目的:分析支气管动脉化疗栓塞联合125I放射性粒子植入术治疗老年非小细胞肺癌的效果。方法选取2011年1月~2013年1月本院收治的90例无法进行根治性切除术的老年非小细胞肺癌患者,将其随机分为观察组、对照组,每组45例。观察组进行支气管动脉栓塞化疗联合125I放射性粒子植入治疗3~6个疗程,对照组行吉西他滨联合顺铂化疗(GP方案)4~6个疗程,比较两组患者的疗效、不良反应发生率、生存时间。结果观察组的有效率为73.33%,对照组为44.44%,两组比较,差异有统计学意义(P<0.05)。随访17个月后,观察组死亡4例,对照组死亡1例,观察组、对照组的中位生存时间分别为(399.2±19.5)、(331.5±16.4)d,组间比较,差异有统计学意义(P<0.05)。结论支气管动脉化疗栓塞联合125I放射性粒子植入术治疗无法进行根治性切除术的老年非小细胞肺癌的短期效果优于GP方案化疗。%Objective To analyze the effect of bronchial arterial chemoembolization combined with 125I active particle implantation in the treatment of elderly non-small cell lung cancer. Methods From January 2011 to January 2013,90 elderly patients with non-small cell lung cancer which could not undergo radical resection operation admitted into our hospital were selected.They were evenly divided into observation group and control group in random.In observation group,bronchial arterial chemoembolization combined with 125I active particle implantation was applied for 3-6 courses of treatment.Control group was provided with gemcitabine combined with cis-platinum chemotherapy (GP scheme) for 4-6 courses of treatment.The therapeutic effect,incidence rate of adverse reaction,and survival time between two groups was compared respectively. Results The effective rate in observation group and control group was 73.33%,44.44% re-spectively and there was a statistical difference between two groups (P<0

  5. Dosimetric and functional analysis of 227 patients treated by permanents prostate implants; Analyse dosimetrique et fonctionnelle de 227 patients traites par implants prostatiques permanents

    Energy Technology Data Exchange (ETDEWEB)

    Champeaux-Orange, E.; Wachter, T. [CHR, 45 - Orleans (France); Le Floch, O.; Haillot, O.; Peneau, M.; Raynaud-Bougnoux, A. [CHU, 37 - Tours (France)

    2009-10-15

    The brachytherapy of prostate by permanent implants is included in the armamentarium of localized prostate cancers with external radiotherapy and radical prostatectomy. The quality evaluation of implantation is essential for the patient and the team managing him. Our retrospective work consisted in analysing the whole of dosimetry data and urinary, digestive and sexual functional results of patients treated in our centers. conclusion: the post-implantation dosimetry analysis is essential to improve the technique and to understand the evolutions. The method of scanning evaluation is difficult but is currently the most used by its accessibility. The low urinary, rectal and sexual morbidity of the brachytherapy makes of this treatment an attractive technique for the patients should be well selected. (N.C.)

  6. 125 I particle implantation and intermittent endocrinotherapy in the treatment of prostate cancer of moderate-ly high risk%125I粒子植入联合间歇性内分泌治疗局部中高危前列腺癌的临床分析

    Institute of Scientific and Technical Information of China (English)

    张继伟; 王海涛; 何群; 阎乙夫; 王建军; 白焱; 夏溟

    2015-01-01

    Objectives:To analyze the clinical efficacy of 125 I particle implantation with intermittent endocrino-therapy in the treatment of prostate cancer of moderately high risk.Methods:A total of 38 prostate cancer patients ran-ging from 60 to 83 years old (average ages of 75.7)were recruited.The PSA lever of these patients was 11.15 -343. 2ng/mL,and the Gleasons Score was 7 -10.All patients were clinical staged as T2b -T3a N0 M0 .Under continual epidural anesthesia,these patients underwent trans -rectal ultrasound.Pictures were transmitted to the computer system to make plan.According to the plan,patient received 125 I particle implantation under the guidance of the trans -rectal ultra-sound.All cases began maximal androgen blockage (MAB)therapy after surgery.Treatment was stopped when PSA fell to 0.2ng/mL and kept stabilized for 3 months.The criterion for the resumption of hormonal therapy was 4ng/mL.Re-sults:All 36 cases were implanted 49 -97 particles.The follow -up period was 12 -84 months,with average of 45 months.Within the 3 -6 months after surgery,all the PSA level fell below the normal level.One case was diagnosed with bone metastasis in 12 months after surgery.3 cases died of non -tumor recurrence and metastasis in 12 -42 months after surgery.Within the 6 -12 months after surgery,the PSA level of 35 cases fell below 0.2ng/mL.7 cases did not reach 0.2ng/mL,so they continued the MAB.MAB of 28 cases was stopped and followed uped for 6 -60 months.There were 20 cases that did not have increased PSA level,and the average off -treatment period was 27.6 months.8 cases had in-creased PSA level in 12 -38 months after hormonal treatment was stopped,so MAB was restarted.After that,the PSA level of 5 cases fell below the 0.2ng/mL within 3 -6 months and stabilized for 6 months.Treatment was stopped and fol-lowed up for 6 -15 months.4 cases did not have increased PSA level.One case died of bone metastasis 42 months after post -operation.3 cases in the 8 cases were still

  7. Synthesis and application of PLGA labeled with 125I

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The weight loss in vivo degradation of poly (lactide-co-glycolide) (PLGA) radiolabeled with 125I was investigated. PLGA with molecular weight (Mw) of 84000(LA/GA=85/15) were labeled with 125I in the chloroform media by circularly heating and round films of about 15 mm in diameter were formed. The composition and Mw of the 125I-PLGA were characterized by 1H-NMR and viscosimeter. The weight loss of this copolymer in vitro and in vivo degradation was quantified by determining radioactivity of materials. The results indicated that PLGA exhibited significantly faster degradation in vivo than that of in vitro conditions.

  8. CT引导下放射性粒子植入治疗恶性纤维组织细胞瘤肺转移瘤临床疗效研究%Clinical efficacy of 125I radioactive seed implantation in postoperative lung metastases of malignant fibrous histiocytoma

    Institute of Scientific and Technical Information of China (English)

    吕金爽; 杨景魁; 郑广钧; 阎卫亮; 柴树德

    2013-01-01

      目的:研究CT引导下经皮穿刺植入放射性125I粒子治疗恶性纤维组织细胞瘤术后肺转移瘤的临床疗效.方法:选取自2006年1月至2011年8月在天津医科大学附属第二医院接受治疗的恶性纤维组织细胞瘤术后经病理明确诊断出现肺转移瘤的患者10例,对转移病灶行CT引导下经皮穿刺肿瘤内放射性125I粒子植入治疗.术后6个月复查胸部CT,与粒子植入前比较肿瘤变化,按照国际标准判定疗效.随访自2006年6月至2012年6月.结果:全部患者顺利完成粒子植入治疗,靶区接受的平均照射剂量为(207.4±43.1)Gy,D100(99.7±10.6)Gy,D90(127.5±16.1)Gy.植入术后6个月随访,有效率80.0%.截至2012年6月,10例患者中2例生存,8例死亡,死亡患者术后平均生存时间14.6±3.5个月,中位生存期13个月.术中6例患者出现气胸,其中3例行胸腔闭式引流术,3例行胸腔穿刺抽气;6例患者出现肺内针道出血,不伴咳血,无进行性血胸,止血处理后症状消失,1个月后复查出血吸收.结论:放射性粒子对于恶性纤维组织细胞瘤术后肺部转移病灶短期局部效果明显,可以作为一种有效的局部治疗手段.%Objective: To investigate the clinical efficacy of CT-guided percutaneous 125I radioactive seed implantation in treating postoperative lung metastases of malignant fibrous histiocytoma (MFH). Methods: From June 2006 to August 2011, 10 patients with pathologically confirmed lung metastases after MFH surgery received CT-guided percutaneous 125I radioactive seed implantation. After a six-month implantation, the chest CT scan was reviewed and the changes were evaluated according to international standards. The pa-tients were followed up from June 2006 to June 2012. Results: All operations were successfully completed. The average dose delivered to the nidus was (207.4±43.1) Gy, D100 (99.7±10.6)Gy, D90 (127.5±16.1) Gy. Two patients were alive and eight were dead until June

  9. Curative effectinvess analysis of 125I seed implantation and drug for pain caused by metastatic or recurrent head and neck cancers%125I粒子植入与药物治疗头颈部复发转移癌性疼痛疗效比较

    Institute of Scientific and Technical Information of China (English)

    孙美玲; 王娟; 唐富龙; 张宏涛; 吴立丽; 万燕

    2014-01-01

    目的 探讨放射性125I粒子植入与药物对头颈部复发转移癌止痛效果的差异.方法 2011年1月至2012年10月收治的20例头颈部复发转移癌性疼痛患者,其中头颈部放疗后复发者9例,术后及放疗后复发者9例,术后复发者2例.随机分为粒子组10例,支持组10例.粒子组以CT病变作为参考靶区,应用近距离治疗计划系统(TPS)制定治疗计划,采用活度为1.31×107~2.96×107 Bq(0.3~0.8 mCi)的粒子,CT及B超双引导下植入,术后24 h内CT扫描,剂量验证D90为80 ~ 120 Gy.支持组遵循世界卫生组织三阶梯镇痛疗法给予药物支持治疗.随访观察两组的客观缓解率、疼痛缓解及并发症.结果 随访6个月,粒子组术后1、2、3个月客观缓解率分别为50%、60%、80%,支持组治疗1、2、3个月客观缓解率均为0.两组疼痛评分中位值可控制在2~4分,支持组疼痛评分波动较粒子组大.粒子组未发现严重的放射性不良反应,支持组药物不良反应明显.结论 放射性125I粒子植入治疗头颈部复发转移癌疼痛疗效确切,止痛起效快,并发症少.%Objective To investigate the curative effectiveness of radioactive 125I-seed implantation and drug treatment in patients with pain caused by recurrent or metastatic head and neck cancers.Methods The retrospective analysis was done on 20 patients,concluding 9 recurrent cases after radiotherapy,9 cases after radiotherapy and operation,and 2 cases after operation,with pain caused by recurrent or metastatic head and neck cancers from Jan.2011 to Oct.2012.They were randomly divided into seed group and support group.The patients in seed group were implanted with 125I seeds guided by CT and ultrasound.The single seed activity ranged from 0.3-0.8 mCi (1.30 × 107-2.96 × 107 Bq).The implantation was carried out according to treatment planning system (TPS).The patients in support group were treated by drug for support treatment following three steps analgesic

  10. Assessment of wrought ASTM F1058 cobalt alloy properties for permanent surgical implants.

    Science.gov (United States)

    Clerc, C O; Jedwab, M R; Mayer, D W; Thompson, P J; Stinson, J S

    1997-01-01

    The behavior of the ASTM F1058 wrought cobalt-chromium-nickel-molybdenum-iron alloy (commonly referred to as Elgiloy or Phynox) is evaluated in terms of mechanical properties, magnetic resonance imaging, corrosion resistance, and biocompatibility. The data found in the literature, the experimental corrosion and biocompatibility results presented in this article, and its long track record as an implant material demonstrate that the cobalt superalloy is an appropriate material for permanent surgical implants that require high yield strength and fatigue resistance combined with high elastic modulus, and that it can be safely imaged with magnetic resonance.

  11. Synthesis of serotonin transporter imaging agent [125I]ADAM

    Institute of Scientific and Technical Information of China (English)

    LU Chun-Xiong; WU Chun-Ying; JIANG Quan-Fu; CHEN Zheng-Ping; ZHANG Tong-Xing; LI Xiao-Ming; WANG Song-Pei

    2005-01-01

    The synthesis of serotonin transporter imaging agent [125I] -2-((2-((dimethylamino)methyl)phenyl)thio)-5-iodophenylamine([125I] ADAM) was reported. The chemical structure of the labeling precursor 5- (tributylstannyl) -2-((2-((dimethylamino)methyl)phenyl)thio)phenylamine and all its intermediates were verified by IR,1HNMR and MS. The .radioiodinated compound was prepared using iododestannylation reaction by hydrogen peroxide. Final radiochemical purity was above 95% determined by TLC.

  12. [Behaviour of some serum enzymes after permanent pacemaker implantation (author's transl)].

    Science.gov (United States)

    Cappelletti, F; Maiolino, P; Allegri, P; Barbieri, E; de Lio, U; Morlino, T; Ometto, R; Vincenzi, M

    1978-01-01

    The behaviour of some serum enzymes (CPK, LDH, alpha HBDH, SGOT) in 50 patients after permanent pacemaker implantation is outlined. Changes of each enzyme were analyzed statistically by applying Student's t test. Most significant changes are represented by the increase in CPK serum concentrations (19 cases). In 14 of them LDH isoenzymes were evaluated and in 4 patients alteration of LDH1/LDH2 ratio suggestive of cardiac "injury" were observed.

  13. 术中125I粒子植入联合术后化学治疗中晚期食管鳞癌%125I radioactive seeds implantation combined with postoperative chemotherapy in treatment of advanced esophageal squamous cell carcinoma

    Institute of Scientific and Technical Information of China (English)

    吕进; 曹秀峰; 朱斌; 王冬冬; 纪律; 王山; 安红银

    2011-01-01

    目的 探讨术中125I粒子植入联合术后化学治疗治疗胸段中晚期食管鳞癌(ESCC)的安全性及疗效.方法 前瞻性队列研究,入组时间为2000年1月至2005年12月.根据ESCC术前CT分期标准,南京医科大学附属南京第一医院肿瘤外科和盐城市肿瘤医院胸外科298例Ⅱ~Ⅲ期胸段ESCC患者通过计算机随机数字法分为术中125I粒子植入联合术后化学治疗组(A组,98例)、术后放射化学治疗组(B组,100例)及单纯根治术组(C组,100例).三组均行食管癌根治术.再根据术后pTNM分期标准,最终实际入组Ⅱb~Ⅲ期胸段ESCC患者233例,三组分别为78例、75例、80例.依据治疗计划系统(TPS)所确定的剂量,A组于术中直视下植入125I粒子.选用0.5 mCi的125I粒子10~22粒,总活度在5~11 mCi,肿瘤匹配周边剂量60~70 Gy,术后通过影像学手段(CT、X线片)行粒子验证和质量评估.观察患者术后并发症,通过CT监测肿瘤影像学、局部复发情况,随访术后1、3、5、10年生存率.结果 A组术后粒子验证无移位、脱落,质量评估满意.A、B、C组局部复发率分别为11.5%、13.3%、38.8%,比较差异有统计学意义(P<0.05).3组并发症比较差异无统计学意义(P>0.05).3组1年生存率对比差异无统计学意义(P>0.05),A、B、C组3、5、10年总体及无进展生存率分别为64.8%,37.7%,25.1%;63.3%,36.9%,24.9%;43.6%,25.0%,12.6%)及63.5%,37.4%,15.1%;62.5%,36.6%,14.4%;42.5%,25.6%,6.2%;3组比较差异均有统计学意义(P<0.05).结论 术中125I粒子植入联合术后化疗与术后放化疗治疗中晚期食管鳞癌疗效相当,是简单、安全、有效的方法,可降低局部复发率、延长患者生存期.%Objective To evaluate the safety and efficacy of 125I radioactive seeds implantation combined with postoperative chemotherapy as a treatment option for thoracic advanced esophageal squamous cell carcinoma(ESCC). Methods A prospective cohort study was carried out

  14. Determination of prescription dose for Cs-131 permanent implants using the BED formalism including resensitization correction

    Energy Technology Data Exchange (ETDEWEB)

    Luo, Wei, E-mail: wei.luo@uky.edu; Molloy, Janelle; Aryal, Prakash; Feddock, Jonathan; Randall, Marcus [Department of Radiation Medicine, University of Kentucky, Lexington, Kentucky 40536 (United States)

    2014-02-15

    Purpose: The current widely used biological equivalent dose (BED) formalism for permanent implants is based on the linear-quadratic model that includes cell repair and repopulation but not resensitization (redistribution and reoxygenation). The authors propose a BED formalism that includes all the four biological effects (4Rs), and the authors propose how it can be used to calculate appropriate prescription doses for permanent implants with Cs-131. Methods: A resensitization correction was added to the BED calculation for permanent implants to account for 4Rs. Using the same BED, the prescription doses with Au-198, I-125, and Pd-103 were converted to the isoeffective Cs-131 prescription doses. The conversion factor F, ratio of the Cs-131 dose to the equivalent dose with the other reference isotope (F{sub r}: with resensitization, F{sub n}: without resensitization), was thus derived and used for actual prescription. Different values of biological parameters such as α, β, and relative biological effectiveness for different types of tumors were used for the calculation. Results: Prescription doses with I-125, Pd-103, and Au-198 ranging from 10 to 160 Gy were converted into prescription doses with Cs-131. The difference in dose conversion factors with (F{sub r}) and without (F{sub n}) resensitization was significant but varied with different isotopes and different types of tumors. The conversion factors also varied with different doses. For I-125, the average values of F{sub r}/F{sub n} were 0.51/0.46, for fast growing tumors, and 0.88/0.77 for slow growing tumors. For Pd-103, the average values of F{sub r}/F{sub n} were 1.25/1.15 for fast growing tumors, and 1.28/1.22 for slow growing tumors. For Au-198, the average values of F{sub r}/F{sub n} were 1.08/1.25 for fast growing tumors, and 1.00/1.06 for slow growing tumors. Using the biological parameters for the HeLa/C4-I cells, the averaged value of F{sub r} was 1.07/1.11 (rounded to 1.1), and the averaged value of F

  15. The factor analysis of the incidence of pneumothorax after CT-guided 125I radioactive seed implantation for lung cancer%CT引导下125I粒子植入治疗肺癌术后气胸发生率的相关因素分析

    Institute of Scientific and Technical Information of China (English)

    霍小东; 杨景魁; 闫卫亮; 郑广钧; 柴树德; 孟娜; 杨瑞杰; 王俊杰

    2014-01-01

    Objective To analyze the impact factors of incidence of pneumothorax after CT guided puncture with radioactive 125I seed implantation in lung cancer patients.Methods 821 cases with lung cancer were treated with CT-guided percutaneous with radioactive particles implantation.198 cases of pneumothorax patients were collected.The impact factors of incidence of pneumothorax were analyzed by parallel unconditioned logistic regression.Results 24.1% (198/821) of cases had pneumothorax after CT guided puncture.Single variate analysis showed that the incidence of pneumothorax was ralated with seven factors,such as patients with the average depth of implanted needle,whether patients with COPD(chronic obstructive pulmonary diseases),atelectasis,implantation pin number and operation time,puncture angle,and the diameter of the tumor(x2 =10.293,11.463,5.310,8.868,13.348,9.326,16.504,P <0.05).176 patients of intercurrent COPD with postoperative pneumothorax suffered from 65 cases.The cases of distance between the chest wall and needle less than 6 cm(205 cases),8-12 cm(378 cases)and greater than 12 cm (238 cases),the postoperative pneumothorax occurred in 29 (14.1%),98 (25.9%),71 (29.8%)cases,respectively.The number of needles were less than 5(183 cases),5-10 (408 cases),more than 10 (230 cases),the postoperative pneumothorax occurred in 31 (16.9%),92 (22.5 %),75 (32.6%),respectively.The surgery time was less than 10 min(198 cases),10-20 min(412 cases)and more than 30 min(211 cases),the postoperative pneumothorax occurred in 27(13.6%),101 (24.5%),70(33.2%) respectively.19 cases(14.4%) with COPD (132 case) suffered from pneumothorax.The multivariate logistic regression analysis showed that the prior four factor were risk factors of pneumothorax (OR =1.676,2.147,1.827,2.368,P <0.05),and the last one is protective factor(OR =0.367,P < 0.05).Conclusions COPD disease history,long distance between lesion and chest wall,plenty of needles surgery time can affect

  16. CT引导下125I放射性粒子植入治疗肺癌纵隔淋巴结4R组转移进针路径的临床研究%The clinical study of the puncture paths in treating 4R mediastinal lymphnode metastasis of lung cancer by implantation of 125I radioactive seeds

    Institute of Scientific and Technical Information of China (English)

    吕金爽; 郑广钧; 杨景魁; 阎卫亮; 柴树德

    2012-01-01

    目的 探讨CT引导下经皮穿刺对肺癌4R组纵隔淋巴结转移灶进行125I放射性粒子植入治疗的路径选择.方法 选取2004年6月至2011年4月在我院接受治疗的经病理学明确诊断的伴有4R组纵隔淋巴结转移的晚期肺癌患者36例,其中10例患者出现上腔静脉综合征.对该组患者的淋巴结转移灶行CT引导下经皮穿刺125I放射性粒子植入治疗,采取自右前胸壁、右侧胸壁及右后胸壁三种进针路径进行粒子植入.术后6个月复查胸部CT,与粒子植入前比较肿瘤变化,按照国际标准判定疗效.随访自2004年12月至2011年10月.结果 全部患者顺利完成粒子植入治疗,靶区接受的平均照射剂量为(236.8±12.9)Gy,D100(94.8±9.8)Gy,D90(139.6±11.6)Gy.植入术后6个月随访,有效率80.6%,行PET-CT检查的8例患者中有3例显示病灶活性完全消失.出现上腔静脉综合征的10例患者中症状及体征完全消失2例,好转6例.术中9例患者出现气胸,其中6例行胸腔闭式引流术,3例行胸腔穿刺抽气;6例患者出现肺内出血,其中2例伴有咳血,无进行性血胸,止血处理后症状消失,1个月后复查出血吸收.结论 对4R组纵隔淋巴结转移癌进行CT引导下125I放射性粒子植入治疗,术中选择恰当的进针路径进行放射性粒子植入,使放射剂量分布合理提高疗效,并可减少穿刺损伤等并发症.%Objective To research and discuss the puncture paths in treating 4R mediastinal lymphnode metastasis of lung cancer by CT-guided percutaneous implantation of I25I radioactive seeds. Methods Select 36 patients with advanced cancer from Jun 2004 to Apr 2011, who had been pathology confirmed 4R mediastinal lymphnode metastasis. 10 of them had appeared superior vena cava syndrome( SVCS ). We treated the nidus by CT-guided percutaneous implantation of 125 I radioactive seeds. There were 3 puncture paths( from right anterior chest wall, right side chest wall and right posterior

  17. Preparation and characterization of 125 I labeled bovine serum albumin

    Directory of Open Access Journals (Sweden)

    K S Ashwitha Rai

    2015-01-01

    Full Text Available Bovine serum albumin is a model protein, which has been conventionally used as protein standard and in many areas of biochemistry, pharmacology and medicine. Radioiodination procedure for bovine serum albumin employing chloramine-T as an oxidant with slight modification was evaluated critically to establish the optimal conditions for the preparation of radiolabeled tracer ( 125 I-BSA with required specific activity without impairing the immune reactivity and biological activity. Optimized radioiodination procedure involving 10 µg of chloramine-T along with 20 µg of sodium metabisulphite with 60 seconds incubation at 2° yielded 125 I-BSA with high integrity.

  18. Psychosocial aspects and mental health in children after permanent pacemaker implantation

    DEFF Research Database (Denmark)

    Andersen, C; Hørder, K; Kristensen, L

    1994-01-01

    The present study was designed to evaluate the psychosocial status and the mental health of children receiving a permanent pacemaker during childhood. Nineteen children under the age of 19 years had a permanent pacemaker implanted. Contact was established to 15 of these patients, 7 girls and 8 boys......, and they were given a child-psychiatric evaluation consisting of a semi-structured and a child-psychiatric interview. The psychological interview used intelligence tests and the Draw-A-Person test as well as the Rorschach test. The patients had had their pacemakers during an average of 6.7 years (range 3......-14). Generally the psychological condition was strained in 7 families, in which psychiatric and social therapy had been necessary. The children's intelligence was within normal ranges, average IQ being 110 (range 80-135). The children had abnormal body image related to the pacemaker. Adults virtually incorporate...

  19. [Permanent implant prostate cancer brachytherapy: 2013 state-of-the art].

    Science.gov (United States)

    Cosset, J-M; Hannoun-Lévi, J-M; Peiffert, D; Delannes, M; Pommier, P; Pierrat, N; Nickers, P; Thomas, L; Chauveinc, L

    2013-04-01

    With an experience of more than 25 years for the pioneers (and more than 14 years in France), permanent implant brachytherapy using iodine 125 seeds (essentially) is now recognized as a valuable alternative therapy for localized low-risk prostate cancer patients. The possible extension of the indications of exclusive brachytherapy towards selected patients in the intermediate-risk group has now been confirmed by several studies. Moreover, for the other patients in the intermediate-risk group and for the patients in the high-risk group, brachytherapy, as an addition to external radiotherapy, could represent one of the best ways to escalate the dose. Different permanent implant brachytherapy techniques have been proposed; preplanning or real-time procedure, loose or stranded seeds (or both), manual or automatic injection of the seeds. The main point here is the ability to perfectly master the procedure and to comply with the dosimetric constraints, which have been recently redefined by the international societies, such as the GEC-ESTRO group. Mid- and long-term results, which are now available in the literature, indicate relapse-free survival rates of about 90% at 5-10 years, the best results being obtained with satisfactory dosimetric data. Comparative data have shown that the incontinence and impotence rates after brachytherapy seemed to be significantly inferior to what is currently observed after surgery. However, a risk of about 3 to 5% of urinary retention is usually reported after brachytherapy, as well as an irritative urinary syndrome, which may significantly alter the quality of life of the patients, and last several months. In spite of those drawbacks, with excellent long-term results, low rates of incontinence and impotence, and emerging new indications (focal brachytherapy, salvage brachytherapy after localized failure of an external irradiation), permanent implant prostate brachytherapy can be expected to be proposed to an increasing number of patients

  20. Dosimetric results in implant and post-implant and low rate in brachytherapy prostate cancer with loose seeds and attached; Resultados dosimetricos en el implante y post-impante en braquiterapia de baja tasa en cancer de prostata con semillas sueltas y unidas

    Energy Technology Data Exchange (ETDEWEB)

    Juan-Senabre, X. J.; Albert Antequera, M.; Lopez-Tarjuelo, J.; Santos Serra, A.; Perez-Mestre, M.; Sanchez Iglesias, A. L.; Conde Moreno, A. J.; Gonzalez Vidal, V.; Beltran Persiva, J.; Muelas Soria, R.; Ferrer Albiach, C.

    2015-07-01

    The objective is determine differences dosimetry statistics on the dosimetry of the implant and post-implant in brachytherapy of low rate with implants permanent in prostate using seed of 125-I loose and attached Both in lives and in the post-prostatic plans dosimetric coverage is good and restrictions in urethra and rectum for both groups of patients are met. Not migrating with joined is evident, as well as better dosimetric homogeneity. (Author)

  1. Stereotactic iodine-125 brachytherapy for brain tumors: temporary versus permanent implantation

    Directory of Open Access Journals (Sweden)

    Ruge Maximilian I

    2012-06-01

    Full Text Available Abstract Stereotactic brachytherapy (SBT has been described in several publications as an effective, minimal invasive and safe highly focal treatment option in selected patients with well circumscribed brain tumors 40 cGy/h in combination with adjuvant external beam radiation and/or chemotherapy for the treatment of malignant gliomas and metastases resulted in increased rates of radiation induced adverse tissue changes requiring surgical intervention. Vice versa, such effects have been only minimally observed in numerous studies applying low dose rate (LDR regiments (3–8 cGy/h for low grade gliomas, metastases and other rare indications. Besides these observations, there are, however, no data available directly comparing the long term incidences of tissue changes after HDR and LDR and there is, furthermore, no evidence regarding a difference between temporary or permanent LDR implantation schemes. Thus, recommendations for effective and safe implantation schemes have to be investigated and compared in future studies.

  2. Apical Ballooning Syndrome (Takotsubo Cardiomyopathy after Permanent Dual-Chamber Pacemaker Implantation

    Directory of Open Access Journals (Sweden)

    Armando Gardini

    2012-01-01

    Full Text Available Apical ballooning syndrome, also called takotsubo cardiomyopathy, has been recently reported. It may mimic acute myocardial infarction and is typically observed in postmenopausal women after stressful events. A 75-year-old female after permanent dual chamber pacemaker implant complained of chest pain with repolarization alterations suggesting acute myocardial ischemia. Echocardiography showed a left ventricle with akinesia of the apical portions and reduced global systolic function. The patient was treated with antithrombotic agents and intravenous nitrates. No coronary lesions were found at angiography. At ventriculography, a typical takotsubo-like shape of the left ventricle was observed. The clinical and echocardiographic picture normalized at discharge.

  3. Preclinical pharmacological study on 125I-IPPA

    Institute of Scientific and Technical Information of China (English)

    1999-01-01

    Myocardial uptake of 125I-IPPA in rats showed a peak of 4.4% of injected dose per gram.The half elimination time of myocardium was 3.8min and the maximaluptake of thyroid is only 0.005%ID/organ at 120min.The initial halftime of 2.7min in rabbits was obtained from the elimination curve ofradioactivity in blood.In vitro binding test for 125I-IPPA to HSAshowed rather constant level of activation during two hours.The second peak of extraction was observed in major organs ofrats, in rabbits' elimination of radioactivity and in bindingtest for 125I-IPPA to albumin in vivo.Toxicity trial was up tostandard.The tolerance of a mouse to IPPA was 560 times as highas that of a person to IPPA.It demonstrated that 125I-IPPA couldbe quickly extracted by myocardium, and its catabolites were excretedin the urine with almost no iodine loss.All the results were found toagree with the expectations based on the principal metabolic path ofphenyl fatty acid.

  4. 125I seed irradiation induces up-regulation of the genes associated with apoptosis and cell cycle arrest and inhibits growth of gastric cancer xenografts

    OpenAIRE

    2012-01-01

    Abstract Background Iodine 125 (125I) seed irradiation can be used as an important supplementary treatment for unresectable advanced gastric cancer. Here, we aim to comprehensively elucidate the biological effects induced by 125I seed irradiation in human gastric cancer xenograft model by using global expression and DNA methylation analyses. Methods The 48 mice bearing NCI-N87 gastric cancer xenografts were randomly separated into 2 groups: sham seeds (O mCi) were implanted into the control g...

  5. Optimal needle arrangement for intraoperative planning in permanent I-125 prostate implants

    Energy Technology Data Exchange (ETDEWEB)

    Thompson, S.A. [Department of Medical Physics, North Shore-Long Island Jewish Health System, Manhassett, NY (United States); Fung, A.Y.C.; Zaider, M. [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY (United States)

    2002-08-21

    One limitation of intraoperative planning of permanent prostate implants is that needles must already be in the gland before planning images are acquired. Improperly placed needles often restrict the capability of generating optimal seed placement. We developed guiding principles for the proper layout of needles within the treatment volume. The Memorial Sloan-Kettering Cancer Center planning system employs a genetic algorithm to find the optimal seed implantation pattern consistent with pre-assigned constraints (needle geometry, uniformity, conformity and the avoidance of high doses to urethra and rectum). Ultrasound volumes for twelve patients with I-125 implants were used to generate six plans per patient (total 72 plans) with different needle arrangements. The plans were evaluated in terms of V100 (percentage prostate volume receiving at least the prescription dose), U135 (percentage urethra volume receiving at least 135% of prescription dose), and CI (conformity index, the ratio of treatment volume to prescription dose volume.) The method termed POSTCTR, in which needles were placed on the periphery of the largest ultrasound slice and posterior central needles were placed as needed, consistently gave superior results for all prostate sizes. Another arrangement, labelled POSTLAT, where the needles were placed peripherally with additional needles in the posterior lateral lobes, also gave satisfactory results. We advocate two needle arrangements, POSTCTR and POSTLAT, with the former giving better results. (author)

  6. NOTE: Optimal needle arrangement for intraoperative planning in permanent I-125 prostate implants

    Science.gov (United States)

    Thompson, S. A.; Fung, A. Y. C.; Zaider, M.

    2002-08-01

    One limitation of intraoperative planning of permanent prostate implants is that needles must already be in the gland before planning images are acquired. Improperly placed needles often restrict the capability of generating optimal seed placement. We developed guiding principles for the proper layout of needles within the treatment volume. The Memorial Sloan-Kettering Cancer Center planning system employs a genetic algorithm to find the optimal seed implantation pattern consistent with pre-assigned constraints (needle geometry, uniformity, conformity and the avoidance of high doses to urethra and rectum). Ultrasound volumes for twelve patients with I-125 implants were used to generate six plans per patient (total 72 plans) with different needle arrangements. The plans were evaluated in terms of V100 (percentage prostate volume receiving at least the prescription dose), U135 (percentage urethra volume receiving at least 135% of prescription dose), and CI (conformity index, the ratio of treatment volume to prescription dose volume.) The method termed POSTCTR, in which needles were placed on the periphery of the largest ultrasound slice and posterior central needles were placed as needed, consistently gave superior results for all prostate sizes. Another arrangement, labelled POSTLAT, where the needles were placed peripherally with additional needles in the posterior lateral lobes, also gave satisfactory results. We advocate two needle arrangements, POSTCTR and POSTLAT, with the former giving better results.

  7. Preparation of 19-iodo cholesterol labelled with 125 I; Preparacion del 19-yodocolesterol marcado con 125 I

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, L.; Rebollo, D. V.; Ruiz, J. M.

    1986-07-01

    In this paper a new method of synthesis of 19-iodo cholesterol labelled with ''125 I, from commercial cholesterol, is described. Its high chemical (96%) and radiochemical (99.9%) purities high yield and short time of preparation permit us to dispose or a more accessible labelled compound, which results appropriates for clinical investigations and in the diagnosis of disturbances of the suprarenal glands. (Author) 9 refs.

  8. One piece ultracompact totally implantable electromechanical total artificial heart for permanent use.

    Science.gov (United States)

    Takatani, Setsuo; Sakamoto, Tohru; Ohuchi, Katsuhiro; Nakamura, Makoto; Mizuno, Tomohiro; Arai, Hirokuni

    2002-01-01

    An ultracompact, one piece, totally implantable electromechanical total artificial heart (TAH) has been developed as a permanent replacement for failing hearts. It consists of left and right pusher plate blood pumps (stroke volume 55 ml) made of titanium alloy (Ti-6Al-7Nb) sandwiching a miniaturized electromechanical actuator between them. The diameter of the TAH is 90 mm, with a thickness of 70 mm, yielding an overall volume of 400 ml. It weighs 450 g. Although it is miniaturized, it provided a maximum pump output of 8 L/min against a left afterload of 100 mm Hg. It required approximately 12 watts to provide a pump output of 6.5 L/min with maximum efficiency of 13.5%. To balance left and right flow, the right stroke length was made 10% shorter than the left, and an auxiliary compliance chamber was used to compensate for additional flow differences between them. Motor commutation pulses and a Hall effect pusher plate sensor signal were used in the controller to implement the left master alternate variable rate mode. The calf fitting study revealed excellent anatomic compatibility, and the first successful survivor was obtained in December 2001. Studies of system endurance and biocompatibility are required to ensure long-term reliability. This TAH is promising for permanent replacement of the failing heart as well as for bridge to heart transplantation for the smaller size group of end-stage cardiac patients.

  9. Essure Permanent Birth Control

    Science.gov (United States)

    ... Prosthetics Essure Permanent Birth Control Essure Permanent Birth Control Share Tweet Linkedin Pin it More sharing options ... System Essure is a a permanently implanted birth control device for women (female sterilization). Implantation of Essure ...

  10. A Case of Adult-Onset Acute Rheumatic Fever With Long-Lasting Atrioventricular Block Requiring Permanent Pacemaker Implantation.

    Science.gov (United States)

    Oba, Yusuke; Watanabe, Hiroaki; Nishimura, Yoshioki; Ueno, Shuichi; Nagashima, Takao; Imai, Yasushi; Shimpo, Masahisa; Kario, Kazuomi

    2015-01-01

    A 45-year-old hypertensive Japanese woman presented with epigastric pain on inspiration, fever, complete atrioventricular block and polyarthritis. Her antistreptolysin O levels were markedly elevated. A diagnosis of rheumatic fever was made according to the modified Jones criteria. She was prescribed loxoprofen sodium, which was partially effective for her extracardiac clinical symptoms. However, she had syncope due to complete atrioventricular block with asystole longer than 10 seconds. Consequently, we implanted a permanent pacemaker. Although we prescribed prednisolone, the efficacy of which was limited for the patient's conduction disturbance, the complete atrioventricular block persisted. In our systematic review of 12 similar cases, the duration of complete heart block was always transient and there was no case requiring a permanent pacemaker. We thus encountered a very rare case of adult-onset acute rheumatic fever with persistent complete atrioventricular block necessitating permanent pacemaker implantation.

  11. Intercomparison of ionisation chamber measurements from (125)I seeds.

    Science.gov (United States)

    Davies, J B; Enari, K F; Baldock, C

    2007-05-01

    The reference air kerma rates of a set of individual (125)I seeds were calculated from current measurements of a calibrated re-entrant ionisation chamber. Single seeds were distributed to seven Australian brachytherapy centres for the same measurement with the user's instrumentation. Results are expressed as the ratio of the reference air kerma rate measured by the Australian Nuclear Science & Technology Organisation (ANSTO) to the reference air kerma rate measured at the centre. The intercomparison ratios of all participants were within +/-5% of unity.

  12. Particle-rotor-model calculations in 125I

    Indian Academy of Sciences (India)

    Hariprakash Sharma; B Sethi; P Banerjee; Ranjana Goswami; R K Bhandari; Jahan Singh

    2001-07-01

    Recent experimental data on 125I has revealed several interesting structural features. These include the observation of a three quasiparticle band, prolate and oblate deformed bands, signature inversion in the yrast positive-parity band and identification of the unfavoured ℎ11/2 band showing very large signature splitting. In the present work, particle-rotor-model calculations have been performed for the ℎ11/2 band, using an axially symmetric deformed Nilsson potential. The calculations reproduce the experimental results well and predict a moderate prolate quadrupole deformation of about 0.2 for the band.

  13. Symptomatic sick sinus syndrome requiring permanent pacemaker implantation in a patient uwith mirror image dextrocardia with situs inversus and infertility.

    Science.gov (United States)

    Kahali, Dhiman; Mandal, Saroj; Mandal, Debasmita; Ghose, Arijit; Kanjilal, Souvik

    2013-01-01

    Situs inversus with dextrocardia is a congenital condition in which the heart is a mirror image of the anatomically normal heart on the right side. A patient presented with the sick sinus syndrome accompanying mirror image dextrocardia which was associated with double superior vena cava and a left sided inferior vena cava A permanent transvenous demand pacemaker was inserted because of repeated episodes of dizziness and a single episode of syncope with ECG showing bradycardia with junctional escape rhythm. Precise knowledge of the venous system and the location of the apex of the right ventricle were necessary prior to permanent pacemaker implantation. Without such knowledge pacing may be technically challenging.

  14. /sup 125/I iothalamate an ideal marker for glomerular filtration

    Energy Technology Data Exchange (ETDEWEB)

    Odlind, B.; Haellgren, R.S.; Sohtell, M.; Lindstroem, B.

    1985-01-01

    The triiodinated angiographic contrast medium, iothalamate (usually labelled /sup 125/I), has been used extensively as a marker for glomerular filtration. The authors have studied the renal handling of /sup 125/I iothalamate (IOT) in vivo and in vitro in several species. In renal cortical slices from chicken, rabbit, rat, and monkey, the tissue-to-medium ratio of IOT was twice that of /sup 51/Cr-EDTA (EDTA) at 37 degrees C; a difference that was abolished at 0 degree C and markedly reduced by added o-iodohippurate or iodipamide. In five chickens the steady-state renal clearance of IOT (CIOT) was twice that of EDTA (CEDTA) or /sup 3/H inulin (C1); a difference that was abolished by administration of 100 mg/kg/hr of novobiocin, an organic anion transport inhibitor. CEDTA was similar to C1 before as well as after transport inhibition. Utilizing the Sperber technique the mean apparent tubular excretion fraction (ATEF) of IOT was 8%, while that of EDTA was 1%. After novobiocin coinfusion (new steady-state) ATEFIOT was significantly reduced and not different from that of EDTA (-1%). In the same animals the total urinary recovery of IOT was 84 and 57% before and after novobiocin, respectively, while corresponding values for EDTA was unchanged by the inhibitor. In seven rats the renal extraction of IOT was reduced from 29 to 17% by coinfusion of probenecid (5 mg/kg/hr). Corresponding extractions were 82 to 34% and 22% (unchanged) for PAH and EDTA, respectively.

  15. Poster — Thur Eve — 41: Considerations for Patients with Permanently Implant Radioactive Sources Requiring Unrelated Surgery

    Energy Technology Data Exchange (ETDEWEB)

    Basran, P. S; Beckham, WA [Dept. Medical Physics, BC Cancer Agency- Vancouver Island Centre and Dept. Physics and Astronomy, University of Victoria, BC (Canada); Baxter, P [Vancouver Island Health Authority, Victoria, BC (Canada)

    2014-08-15

    Permanent implant of sealed radioactive sources is an effective technique for treating cancer. Typically, the radioactive sources are implanted in and near the disease, depositing dose locally over several months. There may be instances where these patients must undergo unrelated surgical procedures when the radioactive material remains active enough to pose risks. This work explores these risks, discusses strategies to mitigate those risks, and describes a case study for a permanent I-125 prostate brachytherapy implant patient who developed colo-rectal cancer and required surgery 6 months after brachytherapy. The first consideration is identifying the risk from unwarranted radiation to the patient and staff before, during, and after the surgical procedure. The second is identifying the risk the surgical procedure may have on the efficacy of the brachytherapy implant. Finally, there are considerations for controlling for radioactive substances from a regulatory perspective. After these risks are defined, strategies to mitigate those risks are considered. These strategies may include applying the concepts of ALARA, the use of protective equipment and developing a best practice strategy with the operating room team. We summarize this experience with some guidelines: If the surgical procedure is near (ex: 5 cm) of the implant; and, the surgical intervention may dislodge radioisotopes enough to compromise treatment or introduces radiation safety risks; and, the radioisotope has not sufficiently decayed to background levels; and, the surgery cannot be postponed, then a detailed analysis of risk is advised.

  16. Microbial contamination detection at low levels by [125]I radiolabeling

    Science.gov (United States)

    Summers, David; Karouia, Fathi

    Contamination of mission spacecraft is an ongoing issue. A broad diversity of microorganisms have been detected in clean rooms where spacecraft are assembled. Some of which, depicted as oligotroph, are of special regard, as they are capable of colonizing inorganic surfaces like metal, and have been shown to be a concern for forward contamination of pristine celestial bodies. Currently, the NASA standard assay is the only approved assay intended for the enumeration of spores and heterotrophic microbial populations. However, culture-based microbial detection methods underestimate the viable microbial population. More recently, adenosine triphosphate (ATP) bioluminescence and limulus amebocyte lysate (LAL) assays, which employ measure-ments of selected metabolic products as a proxy of biomass, have been used successfully to circumvent the necessity of the growth of microorganisms in order to estimate the biodurdens associated with spacecraft assembly facility. However, these methods have limitation in the amount of cells that can be detected, i.e., 103 cells, and the type of microorganisms respec-tively. This work seeks to develop a new highly sensitive method for the determination of bioburdens (and the detection of microorganisms and life) that is independant of the type of organism while preserving a good turn-around time for analysis for planetary protection purposes. The assay is based on the detection of the organism's protein by labeling them by radioiodination, 125 I, of aromatic rings on tyrosine amino acids residues. Radiolabeling techniques are inherently sensitive and 125 I, in particular, benefits from a 60 day half-life, providing greater activity and signal per unit number of labels. Furthermore, microorganisms can contain over 50% of protein by dry weight. Thus, just one label per protein increases the sensitivity, compared to the ATP and LAL assays, by one and three orders of magnitude by using standard detection methods and the use of multiphoton

  17. 125I-TOC和125I-F-PGA放射化学纯度的测定%Determination of Radiochemical Purity of 125 I-TOC and 125 I-F-PGA

    Institute of Scientific and Technical Information of China (English)

    杨科亚; 范我; 张友九; 许玉杰; 朱然; 胡明江

    2006-01-01

    为比较3种测定125I标记的奥曲肽(TOC)和叶酸-青霉素酰化酶复合物(F-PGA)的放射化学纯度(RCP)的方法是否具有一致性,采用Iodogen法对TOC和F-PGA进行放射性碘标记,并用高效液相色谱法(HPLC)、三氯醋酸(TCA)沉淀法和纸层析法测定标记物的放射化学纯度(RCP),其中TCA沉淀法设4种蛋白浓度以观察其对RCP测定的影响.结果表明,HPLC和纸层析法均能有效分离标记物和游离碘,且HPLC测定这种标记物的RCP最为精确可信.在TCA沉淀法中,用0.2%的小牛血清白蛋白(BSA)测得的RCP最低,而用其它3个BSA浓度测得的RCP则无明显差异(P>0.05);当RCP<10%时,TCA沉淀法与纸层析法测得的RCP间无明显差异(P>0.05),而要高于HPLC(P<0.01);当RCP>10%时,对125I-TOC而言,TCA沉淀法要略低于HPLC和纸层析(P<0.05),但后2种方法无明显差异(P>0.05),且对125I-F-PGA而言,3种方法无明显差异(P>0.05).3种方法两两之间显著相关(r=0.996~0.999,P<0.001).

  18. Brain necrosis after permanent low-activity iodine-125 implants: case report and review of toxicity from focal radiation.

    Science.gov (United States)

    Bampoe, J; Nag, S; Leung, P; Laperriere, N; Bernstein, M

    2000-01-01

    Focal irradiation has emerged as a useful modality in the management of malignant brain tumors. Its main limitation is radiation necrosis. We report on the radiation dose distribution in the cerebellum of a patient who developed imaging and autopsy diagnosis of radiation necrosis after permanent iodine-125 implants for a solitary osseous plasmacytoma of her left occipital condyle. A 55-year-old woman initially presented with neck and occipital pain and a lytic lesion of her left occipital condyle. A cytological diagnosis of solitary osseous plasmacytoma was made by transpharyngeal needle biopsy. After an initial course of external beam radiation, the patient required further treatment with systemic chemotherapy 21 months later for clinical and radiographic progression of her disease. She ultimately required subtotal surgical resection of an anaplastic plasmacytoma with intracranial extension. Permanent low-activity iodine-125 seeds were implanted in the tumor cavity. Satisfactory local control was achieved. However, clinical and imaging signs of radiation damage appeared 28 months after iodine-125 seed implantation. Progressive systemic myeloma led to her death 11 years after presentation and 9 years after seed implantation. Radiation dose distribution is described, with a discussion of toxicity from focal radiation dose escalation.

  19. An algorithm for efficient metal artifact reductions in permanent seed implants

    Energy Technology Data Exchange (ETDEWEB)

    Xu Chen; Verhaegen, Frank; Laurendeau, Denis; Enger, Shirin A.; Beaulieu, Luc [Departement de Radio-Oncologie et Centre de Recherche en Cancerologie, Universite Laval, Centre Hospitalier Universitaire de Quebec, 11 Cote du Palais, Quebec, Quebec G1R 2J6 (Canada) and Departement de Genie Electrique et Genie Informatique, Laboratoire de Vision et Systemes Numeriques, Universite Laval, Quebec, Quebec G1K 7P4 (Canada); Department of Radiation Oncology (MAASTRO), GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht 6201 BN (Netherlands) and Oncology Department, Montreal General Hospital, McGill University, 1650 Cedar Avenue, Montreal, Quebec H3G 1A4 (Canada); Departement de Genie Electrique et Genie Informatique, Laboratoire de Vision et Systemes Numeriques, Universite Laval, Quebec, Quebec G1K 7P4 (Canada); Departement de Radio-Oncologie et Centre de Recherche en Cancerologie, Universite Laval, Centre Hospitalier Universitaire de Quebec, 11 Co circumflex te du Palais, Quebec, Quebec G1R 2J6 (Canada); Departement de Radio-Oncologie et Centre de Recherche en Cancerologie, Universite Laval, Centre Hospitalier Universitaire de Quebec, 11 Cote du Palais, Quebec, Quebec G1R 2J6 (Canada) and Departement de Physique, de Genie Physique et d' Optique, Universite Laval, Quebec, Quebec G1K 7P4 (Canada)

    2011-01-15

    Purpose: In permanent seed implants, 60 to more than 100 small metal capsules are inserted in the prostate, creating artifacts in x-ray computed tomography (CT) imaging. The goal of this work is to develop an automatic method for metal artifact reduction (MAR) from small objects such as brachytherapy seeds for clinical applications. Methods: The approach for MAR is based on the interpolation of missing projections by directly using raw helical CT data (sinogram). First, an initial image is reconstructed from the raw CT data. Then, the metal objects segmented from the reconstructed image are reprojected back into the sinogram space to produce a metal-only sinogram. The Steger method is used to determine precisely the position and edges of the seed traces in the raw CT data. By combining the use of Steger detection and reprojections, the missing projections are detected and replaced by interpolation of non-missing neighboring projections. Results: In both phantom experiments and patient studies, the missing projections have been detected successfully and the artifacts caused by metallic objects have been substantially reduced. The performance of the algorithm has been quantified by comparing the uniformity between the uncorrected and the corrected phantom images. The results of the artifact reduction algorithm are indistinguishable from the true background value. Conclusions: An efficient algorithm for MAR in seed brachytherapy was developed. The test results obtained using raw helical CT data for both phantom and clinical cases have demonstrated that the proposed MAR method is capable of accurately detecting and correcting artifacts caused by a large number of very small metal objects (seeds) in sinogram space. This should enable a more accurate use of advanced brachytherapy dose calculations, such as Monte Carlo simulations.

  20. Dose escalation in permanent brachytherapy for prostate cancer: dosimetric and biological considerations

    Energy Technology Data Exchange (ETDEWEB)

    Li, X Allen [Department of Radiation Oncology, University of Maryland, School of Medicine, 22 South Greene Street, Baltimore, MD 21201-1595 (United States); Wang, Jian Z [Department of Radiation Oncology, University of Maryland, School of Medicine, 22 South Greene Street, Baltimore, MD 21201-1595 (United States); Stewart, Robert D [School of Health Sciences, Purdue University, West Lafayette, IN 47907-1338 (United States); Di Biase, Steven J [Department of Radiation Oncology, University of Maryland, School of Medicine, 22 South Greene Street, Baltimore, MD 21201-1595 (United States)

    2003-09-07

    No prospective dose escalation study for prostate brachytherapy (PB) with permanent implants has been reported. In this work, we have performed a dosimetric and biological analysis to explore the implications of dose escalation in PB using {sup 125}I and {sup 103}Pd implants. The concept of equivalent uniform dose (EUD), proposed originally for external-beam radiotherapy (EBRT), is applied to low dose rate brachytherapy. For a given {sup 125}I or {sup 103}Pd PB, the EUD for tumour that corresponds to a dose distribution delivered by EBRT is calculated based on the linear quadratic model. The EUD calculation is based on the dose volume histogram (DVH) obtained retrospectively from representative actual patient data. Tumour control probabilities (TCPs) are also determined in order to compare the relative effectiveness of different dose levels. The EUD for normal tissue is computed using the Lyman model. A commercial inverse treatment planning algorithm is used to investigate the feasibility of escalating the dose to prostate with acceptable dose increases in the rectum and urethra. The dosimetric calculation is performed for five representative patients with different prostate sizes. A series of PB dose levels are considered for each patient using {sup 125}I and {sup 103}Pd seeds. It is found that the PB prescribed doses (minimum peripheral dose) that give an equivalent EBRT dose of 64.8, 70.2, 75.6 and 81 Gy with a fraction size of 1.8 Gy are 129, 139, 150 and 161 Gy for {sup 125}I and 103, 112, 122 and 132 Gy for {sup 103}Pd implants, respectively. Estimates of the EUD and TCP for a series of possible prescribed dose levels (e.g., 145, 160, 170 and 180 Gy for {sup 125}I and 125, 135, 145 and 155 for {sup 103}Pd implants) are tabulated. The EUD calculation was found to depend strongly on DVHs and radiobiological parameters. The dosimetric calculations suggest that the dose to prostate can be escalated without a substantial increase in both rectal and urethral dose

  1. Clinical research on the treatment effects of radioactive (125)I seeds interstitial brachytherapy on children with primary orbital rhabdomyosarcoma.

    Science.gov (United States)

    Ge, Xin; Ma, Jianmin; Dai, Haojie; Ren, Ling; Li, Quan; Shi, Jitong

    2014-09-01

    Rhabdomyosarcoma (RMS) is one of the most common primary orbital malignancies. However, orbital RMS is a very rare disease, especially in childhood, and the tumor has a high degree of malignancy and rapid development. The objective of the present study was to investigate the clinical treatment effects of radioactive (125)I seeds interstitial brachytherapy on children with primary orbital RMS, which may provide a new method for treating RMS in clinical applications. Radioactive (125)I seeds were used in the present study. Primary lesions from ten children with orbital RMS, including three male and seven female patients, were selected as the targeted areas. The activity, number and spatial location of the seeds were optimized and simulated by applying computer three-dimensional treatment planning system (TPS) software. The interstitial implantation of the radioactive (125)I seeds was conducted on children under general anesthesia according to the TPS simulation results. Quality verifications of the operation were conducted by orbital computed tomography and X-ray plain film at the early stage after operation, and the children were followed up. The patients were followed up by October 2012 with an average follow-up time of 57 ± 17.43 months and a median follow-up time of 55 months. Nine cases achieved complete remission, and one case achieved partial remission, resulting in a total efficiency and survival rate of 100.0 % (10/10). Most patients recovered after treatment or had no radiotherapy side effect after the operations, though 20.0 % of the patients (2/10) experienced corneal opacity, eyeball movement disorder, or loss of sight. Radioactive (125)I seeds interstitial brachytherapy was an effective treatment for children with primary orbital RMS. Results from this study may provide a new clinical approach for the treatment of child patients with primary orbital RMS.

  2. Prostate dose calculations for permanent implants using the MCNPX code and the Voxels phantom MAX

    Energy Technology Data Exchange (ETDEWEB)

    Reis Junior, Juraci Passos dos; Silva, Ademir Xavier da, E-mail: jjunior@con.ufrj.b, E-mail: Ademir@con.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Nuclear; Facure, Alessandro N.S., E-mail: facure@cnen.gov.b [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil)

    2010-07-01

    This paper presents the modeling of 80, 88 and 100 of {sup 125}I seeds, punctual and volumetric inserted into the phantom spherical volume representing the prostate and prostate phantom voxels MAX. Starting values of minimum and maximum activity, 0.27 mCi and 0.38 mCi, respectively, were simulated in the Monte Carlo code MCNPX in order to determine whether the final dose, according to the integration of the equation of decay at time t = 0 to t = {infinity} corresponds to the default value set by the AAPM 64 which is 144 Gy. The results showed that consider sources results in doses exceeding the percentage discrepancy of the default value of 200%, while volumetric consider sources result in doses close to 144 Gy. (author)

  3. An (125)I-labeled octavalent peptide fluorescent nanoprobe for tumor-homing imaging in vivo.

    Science.gov (United States)

    Luo, Haiming; Shi, Jiyun; Jin, Honglin; Fan, Di; Lu, Lisen; Wang, Fan; Zhang, Zhihong

    2012-06-01

    Targeting radiopeptides are promising agents for radio-theranostics. However, in vivo evaluation of their targeting specificity is often obscured by their short biologic half-lives and low binding affinities. Here, we report an approach to efficiently examine targeting radiopeptides with a new class of octavalent peptide fluorescent nanoprobe (Octa-FNP) platform, which is composed of candidate targeting peptides and a tetrameric far-red fluorescent protein (tfRFP) scaffold. To shed light on this process, (125)I-Octa-FNP, (125)I-tfRFP and (125)I-peptide were synthesized, and their targeting functionalities were compared. Both fluorescence imaging and radioactive quantification results confirmed that (125)I-Octa-FNP had a significantly higher cellular binding capability than (125)I-tfRFP. In vivo biodistribution studies show that at 6 h post-injection, (125)I-Octa-FNP had 2-fold and 30-fold higher tumor uptake than that of (125)I-tfRFP and (125)I-peptide, respectively. Moreover, γ-imaging at 24 h post-injection revealed a remarkable accumulation of (125)I-Octa-FNP in the tumor while maintaining an extremely low background contrast, which was further confirmed by immunofluorescence analysis. These data suggested that, as an engineered and multivalent platform, Octa-FNP could enhance the tumor targeting of a designed peptide and provide excellent contrast radioimaging, making it a valuable tool for the evaluation of the targeting ability of specifically designed radiopeptides for cancer theranostics.

  4. One-year cardiac morphological and functional evolution following permanent pacemaker implantation in right ventricular septal position in chagasic patients

    Directory of Open Access Journals (Sweden)

    Otaviano da Silva Júnior

    2012-06-01

    Full Text Available INTRODUCTION: The septal position is an alternative site for cardiac pacing (CP that is potentially less harmful to cardiac function. METHODS: Patients with Chagas disease without heart failure submitted to permanent pacemaker (PP implantation at the Clinics Hospital of the Triângulo Mineiro Federal University (UFTM, were selected from February 2009 to February 2010. The parameters analyzed were ventricular remodeling, the degree of electromechanical dyssynchrony (DEM, exercise time and VO2 max during exercise testing (ET and functional class (NYHA. Echocardiography was performed 24 to 48h following implantation and after one year follow-up. The patients were submitted to ET one month postprocedure and at the end of one year. RESULTS: Thirty patients were included. Patient mean age was 59±13 years-old. Indication for PP implantation was complete atrioventricular (AV block in 22 (73.3% patients and 2nd degree AV block in the other eight (26.7%. All patients were in NYHA I and no changes occurred in the ET parameters. No variations were detected in echocardiographic remodeling measurements. Intraventricular dyssynchrony was observed in 46.6% of cases and interventricular dyssynchrony in 33.3% of patients after one year. CONCLUSIONS: The findings of this work suggest that there is not significant morphological and functional cardiac change following pacemaker implantation in septal position in chagasic patients with normal left ventricular function after one year follow-up. Thus, patients may remain asymptomatic, presenting maintenance of functional capacity and no left ventricular remodeling.

  5. A comparative study of 19-iodo cholesterol-125I 3-acetate and Na 125I in liquid scintillation measurements; Estudio comparativo del acetato de 19-iodocolesterol- -125I con Nal25I en medidas por centelleo liquido

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Barquero, L.; Grau Malonda, A.; Los Arcos Merino, J. M.; Grau Carles, A.

    1994-07-01

    A comparative study of performance of 19-iodo cholesterol {sup 1}25I 3-acetate and sodium iodide samples labeled with 125I is presented for liquid scintillation counting measurements. Quench effect, count rate stability and spectral evolution of samples have been followed for several weeks in Toluene, Hisafe II, Instagel, Dioxane-naphthalene and Toluene-alcohol scintillators. Organic samples have negligible quench effect in the interval of I concentration of 0-90 {mu}g and inorganic samples only show a very small variation, lower than 12%, for Dioxane-naphthalene, in the same range of concentration. Satisfactory stability is obtained in general for both, organic and inorganic samples, but small counting losses, 0.03% for 19-iodocholesterol 1 I 3-acetate samples in Tolue ne-alcohol and 0 .04% for Na 125I samples in Dioxane-naphthalene and Toluene-alcohol, have been reported. (Author) 8 refs.

  6. [{sup 125}I]{beta}-CIT-FE and [{sup 125}I]{beta}-CIT-FP are superior to [{sup 125}I]{beta}-CIT for dopamine transporter visualization: Autoradiographic evaluation in the human brain

    Energy Technology Data Exchange (ETDEWEB)

    Guenther, Ilonka; Hall, Haakan; Halldin, Christer; Swahn, Carl-Gunnar; Farde, Lars; Sedvall, Goeran

    1997-10-01

    The binding of the three dopamine transporter radioligands ([{sup 125}I]{beta}-CIT, [{sup 125}I]{beta}-CIT-FE, and [{sup 125}I]{beta}-CIT-FP) was studied using whole-hemisphere autoradiography on postmortem human brains. The autoradiograms revealed an intense and homogeneous labeling of the nucleus caudatus and putamen but also to varying extent to serotonergic and noradrenergic transporters of neocortex and thalamus. The order of specificity estimated (striatum over neocortex ratios) was {beta}-CIT-FP > {beta}-CIT-FE >> {beta}-CIT, suggesting that {beta}-CIT-FE and {beta}-CIT-FP should be preferred for in vivo studies of the dopamine transporter in the human brain.

  7. Neuropeptide Y receptor binding sites in rat brain: differential autoradiographic localizations with sup 125 I-peptide YY and sup 125 I-neuropeptide Y imply receptor heterogeneity

    Energy Technology Data Exchange (ETDEWEB)

    Lynch, D.R.; Walker, M.W.; Miller, R.J.; Snyder, S.H. (Johns Hopkins Univ. School of Medicine, Baltimore, MD (USA))

    1989-08-01

    Neuropeptide Y (NPY) receptor binding sites have been localized in the rat brain by in vitro autoradiography using picomolar concentrations of both 125I-NPY and 125I-peptide YY (PYY) and new evidence provided for differentially localized receptor subtypes. Equilibrium binding studies using membranes indicate that rat brain contains a small population of high-affinity binding sites and a large population of moderate-affinity binding sites. 125I-PYY (10 pM) is selective for high-affinity binding sites (KD = 23 pM), whereas 10 pM 125I-NPY labels both high- and moderate-affinity sites (KD = 54 pM and 920 pM). The peptide specificity and affinity of these ligands in autoradiographic experiments match those seen in homogenates. Binding sites for 125I-PYY are most concentrated in the lateral septum, stratum oriens, and radiatum of the hippocampus, amygdala, piriform cortex, entorhinal cortex, several thalamic nuclei, including the reuniens and lateral posterior nuclei, and substantia nigra, pars compacta, and pars lateralis. In the brain stem, 125I-PYY sites are densest in a variety of nuclei on the floor of the fourth ventricle, including the pontine central grey, the supragenual nucleus, and the area postrema. 125I-NPY binding sites are found in similar areas, but relative levels of NPY binding and PYY binding differ regionally, suggesting differences in sites labeled by the two ligands. These receptor localizations resemble the distribution of endogenous NPY in some areas, but others, such as the hypothalamus, contain NPY immunoreactivity but few binding sites.

  8. Development of procedure using plasma welding process to produce {sup 125}I seeds; Desenvolvimento de procedimento utilizando processo de soldagem plasma para confeccao de sementes de {sup 125}I

    Energy Technology Data Exchange (ETDEWEB)

    Feher, Anselmo

    2006-07-01

    The prostate cancer, which is the second cause of death by cancer in men, overcome only by lung cancer, is a problem of public health in Brazil. Brachytherapy is among the possible available treatments for prostate cancer, in which small seeds containing {sup 125}I radioisotope are implanted in the prostate. The seed consists of a titanium sealed capsule with 0.8 mm external diameter and 4.5 mm length, containing a central silver wire with adsorbed {sup 125}I. The plasma arc welding is one of the viable techniques for the sealing process. The equipment used in this technique is less costly than in other processes. The main objective of this work was the development and the validation of the welding procedure using plasma welding process and the elaboration of a sealing routine according to Good Manufacturing Practices. The development of this work has presented the following phases: cut and cleaning of the titanium material, determination of the welding parameters, development of a device for holding the titanium tube during the welding process, validation of sealed sources according to ISO 2919 Sealed Radioactive Sources - General Requirements and Classification, leakage test according to ISO 9978 Sealed Radioactive Sources - Leakage Test Methods and metallographic assays. The developed procedure, to seal {sup 125}I seeds using plasma welding process, has shown to be efficient, satisfying all the established requirements of ISO 2919. The results obtained in this work have given the possibility to establish a routine production process according to the orientations presented in resolution RDC number 59 - Good Manufacturing Practices do Medical Products of the ANVISA - Brazilian Nacional Agency of Sanitary Surveillance. (author)

  9. SU-E-T-12: A Comparative Dosimetric Study of Pre and Post Prostate Iodine-125 Permanent Seed Implants

    Energy Technology Data Exchange (ETDEWEB)

    Liu, X; Rahimian, J; Goy, B; Cosmatos, H; Qian, Y [Kaiser Permanente, Los Angeles, CA (United States)

    2015-06-15

    Purpose: Post-implant dosimetry has become the gold standard for prostate implant evaluation. The goal of this research is to compare the dosimetry between pre-plan and post-plan in permanent prostate seed implant brachytherapy. Methods: A retrospective study of 91 patients treated with Iodine-125 prostate seed implant between year 2012∼2014 were performed. All plans were created using a VariSeed 8.0 planning system. Pre-plan ultrasound images were acquired using 0.5 cm slice thickness. Post-plan CT images acquired about 1–4 weeks after implant, fused with the preplan ultrasound images. The prostate and urethra contours were generated using the fusion of ultrasound and CT images. Iodine-125 seed source activities varied between 0.382 to 0.414 mCi per seed. The loading patterns varied slightly between patients depending on the prostate size. Statistical analysis of pre and post plans for prostate and urethra volumes, V100%, V150% and D90, and urethra D10 were performed and reported. Results: The pre and post implant average prostate size was 36.90cc vs. 38.58cc; V100% was 98.33% vs. 96.89%; V150% was 47.09% vs. 56.95%; D90 was 116.35Gy vs. 116.12Gy, urethra volume was 1.72cc vs. 1.85cc, urethra D10% was 122.0% vs. 135.35%, respectively. There was no statistically significant difference between the pre and post-plan values for D90(p-value=0.43). However, there are significant differences between other parameters most likely due to post surgical edema; prostate size (p-value= 0.00015); V100% (p-value=3.7803E-07); V150% (p-value=1.49E-09); urethra volume (p-value= 2.77E-06); Urethra D10 (p-value=7.37E-11). Conclusion: The post-plan dosimetry using CT image set showed similar D90 dose coverage to the pre-plan using the ultrasound image dataset. The study showed that our prostate seed implants have consistently delivered adequate therapeutic dose to the prostate while sparing urethra. Future studies to correlate dose versus biochemical response using patients’ PSA

  10. Assessment of [125I]WYE-230949 as a novel histamine H3 receptor radiopharmaceutical.

    Science.gov (United States)

    Lewis, David Y; Champion, Sue; Wyper, David; Dewar, Deborah; Pimlott, Sally

    2014-01-01

    Histamine H3 receptor therapeutics have been proposed for several diseases such as schizophrenia, attention deficit hyperactivity disorder, Alzheimer's disease and obesity. We set out to evaluate the novel compound, [125I]WYE-230949, as a potential radionuclide imaging agent for the histamine H3 receptor in brain. [125I]WYE-230949 had a high in vitro affinity for the rat histamine H3 receptor (Kd of 6.9 nM). The regional distribution of [125I]WYE-230949 binding sites in rat brain, demonstrated by in vitro autoradiography, was consistent with the known distribution of the histamine H3 receptor. Rat brain uptake of intravenously injected [125I]WYE-230949 was low (0.11 %ID/g) and the ratio of specific: non-specific binding was less than 1.4, as determined by ex vivo autoradiography. In plasma, metabolism of [125I]WYE-230949 into a less lipophilic species occurred, such that less than 38% of the parent compound remained 30 minutes after injection. Brain uptake and metabolism of [125I]WYE-230949 were increased and specific binding was reduced in anaesthetised compared to conscious rats. [125I]WYE230949 is not a potential radiotracer for imaging rat histamine H3 receptors in vivo due to low brain uptake, in vivo metabolism of the parent compound and low specific binding.

  11. Assessment of [125I]WYE-230949 as a novel histamine H3 receptor radiopharmaceutical.

    Directory of Open Access Journals (Sweden)

    David Y Lewis

    Full Text Available Histamine H3 receptor therapeutics have been proposed for several diseases such as schizophrenia, attention deficit hyperactivity disorder, Alzheimer's disease and obesity. We set out to evaluate the novel compound, [125I]WYE-230949, as a potential radionuclide imaging agent for the histamine H3 receptor in brain. [125I]WYE-230949 had a high in vitro affinity for the rat histamine H3 receptor (Kd of 6.9 nM. The regional distribution of [125I]WYE-230949 binding sites in rat brain, demonstrated by in vitro autoradiography, was consistent with the known distribution of the histamine H3 receptor. Rat brain uptake of intravenously injected [125I]WYE-230949 was low (0.11 %ID/g and the ratio of specific: non-specific binding was less than 1.4, as determined by ex vivo autoradiography. In plasma, metabolism of [125I]WYE-230949 into a less lipophilic species occurred, such that less than 38% of the parent compound remained 30 minutes after injection. Brain uptake and metabolism of [125I]WYE-230949 were increased and specific binding was reduced in anaesthetised compared to conscious rats. [125I]WYE230949 is not a potential radiotracer for imaging rat histamine H3 receptors in vivo due to low brain uptake, in vivo metabolism of the parent compound and low specific binding.

  12. Preparation and evaluation of 125 I-rFlic and 125 I-rFlicΔ1 80-400 in noninvasive radioimaging of allorejection%125 I-rFlic及125 I-rFlicΔ180-400的制备及其在同种移植排斥监测中的作用

    Institute of Scientific and Technical Information of China (English)

    薛莹; 张超; 梁婷; 宋静; 侯桂华

    2016-01-01

    目的:探讨放射性碘125标记基因重组鞭毛蛋白(125 I-rFlic)及其片段(125 I-rFlicΔ180-400)在同种移植模型中的生物学分布及靶向性。方法用1,3,4,6-四氯-3α,6α-二苯基甘脲(Iodogen)碘化标记rFlic及rFlicΔ180-400,分析标记率及稳定性,进行放射性配基结合分析;构建小鼠同种/同系皮肤移植模型,于术后第8天尾静脉注射标记物,分析生物学分布和药代动力学特征,进行全身磷屏自显影显像。结果成功制备125 I-rFlic及rFlicΔ180-400,且具有较好的体外稳定性;125 I-rFlicΔ180-400对移植受体脾细胞亲和力更高。生物学分布结果显示,与125 I-rFlic组相比,125 I-rFlicΔ180-400注射组24 h的移植皮片/对侧正常皮片(T/NT)明显升高,P=0.0148。药代动力学结果表明,与125 I-rFlic相比,125 I-rFlicΔ180-400代谢更快。全身磷屏自显影显像显示,注射后6 h的同种移植皮片放射性浓聚较1 h更明显;与125 I-rFlic组相比,125 I-rFlicΔ180-400组移植皮片显像更加清晰。注射后24 h两组均可得到清晰移植皮片显像。结论125 I-rFlic与125 I-rFlicΔ180-400在移植皮片处高度特异性浓聚,可成功显示同种移植急性排斥,而后者比前者拥有更快的代谢率和更快的特异性浓聚。%Objective To evaluate the effect of iodine-125 labeled intact flagellin (125 I-rFlic)and its fragment (125 I-rFlicΔ180-400)in allograft acute rejection model on non-invasive monitoring allorejection.Methods The rFlic and rFlicΔ180-400 were labeled with iodine-125 with iodogen method,and label rate,stability and receptor binding activi-ties were analyzed.After the allograft/isograft mice models were established,biodistribution,pharmacokinetics and phosphor-autoradiography imaging were detected on day 8 post transplantation after two tracers’injection through tail vein separately.Results The prepared 125 I-rFlic and 125 I-rFlicΔ180

  13. ( sup 125 I)Iodoazidococaine, a photoaffinity label for the haloperidol-sensitive sigma receptor

    Energy Technology Data Exchange (ETDEWEB)

    Kahoun, J.R.; Ruoho, A.E. (Univ. of Wisconsin, Madison (United States))

    1992-02-15

    A carrier-free radioiodinated cocaine photoaffinity label, (-)-3-({sup 125}I)iodo-4-azidococaine (({sup 125}I)IACoc), has been synthesized and used as a probe for cocaine-binding proteins. Photoaffinity labeling with 0.5 nM ({sup 125}I)IACoc resulted in selective derivatization of a 26-kDa polypeptide with the pharmacology of a sigma receptor in membranes derived from whole rat brain, rat liver, and human placenta. ({sup 125}I)IACoc labeling of the 26-kDa polypeptide was also inhibited by 10 {mu}M imipramine, amitriptyline, fluoxetine, benztropine, and tetrabenazine. The size of the ({sup 125}I)I-ACoc-labeled proteins is consistent with the size of proteins photolabeled in guinea pig brain and liver membranes by using the sigma photolabel azido-({sup 3}H)DTG. Kinetic analysis of ({sup 125}I)IACoc binding to rat liver microsomes revealed two sites with K{sub d} values of 19 and 126 pM, respectively. The presence or absence of proteolytic inhibitors during membrane preparation did not alter the size of the photolabeled sigma receptor, indicating that the 26-kDa polypeptide was not derived from a larger protein. In summary, ({sup 125}I)IACoc is a potent and highly specific photoaffinity label for the haloperidol-sensitive sigma receptor and will be useful for its biochemical and molecular characterization.

  14. Some quantitative aspects of the labelling of proteins with 125 I by the iodine monochloride method.

    Science.gov (United States)

    Ceska, M; Sjödin, A V; Grossmüller, F

    1971-01-01

    The labelling of proteins by the iodine monochloride method was studied by using a mathematical model. The equations used were primarily derived from the mass law equation of the isotopic exchange reaction between [(125)I]iodide and iodine monochloride. For convenient application, all equations were programmed into a computing desk-top calculator. To support the validity of the theoretical model, a series of iodinations of insulin were performed under various labelling conditions. The results of these experiments compare well with the theoretically derived values. Deviations from the theoretical values occurring at molar ratios of [(125)I]iodide to iodine monochloride 4.0 are explained and suggestions made about how to prevent them. The mathematical model was used to simulate the isotopic exchange, and the iodination reaction under various conditions, to study (a) the influence of the amount of [(125)I]iodide on the amount of [(125)I]iodine monochloride formed, (b) the influence of the specific radioactivity of [(125)I]iodide on the amount of [(125)I]iodine monochloride formed, and (c) the influence of the specific radioactivity of [(125)I]iodide on the number of millicuries needed for labelling to a desired extent.

  15. Labelling of ochratoxins with sup 3 H or sup 125 I

    Energy Technology Data Exchange (ETDEWEB)

    Schmiedova, D.; Veres, K.; Cerny, B. (Ceskoslovenska Akademie Ved, Prague (Czechoslovakia). Ustav Nuklearni Biologie a Radiochemie); Ruprich, J. (Institut Hygieny a Epidemiologie, Prague (Czechoslovakia)); Nemecek, J. (Slovak Academy of Sciences, Prague (Czechoslovakia). Inst. of Microbiology)

    1989-01-01

    Catalytic hydrogenation of ochratoxin A by carrier-free tritium was used to prepare {sup 3}H-ochratoxin B with a high specific activity. Iodination of ochratoxin B by carrier-free Na {sup 125}I using the chloramine method yielded {sup 125}I-ochratoxin with a high specific activity. Another {sup 125}I-derivative of ochratoxin A was prepared by iodination of an ochratoxin A - L-tyrosine-methylester conjugate. All three radioactive preparations were found to be useful for radioimmunoassay. (author).

  16. Brachytherapy optimization using radiobiological-based planning for high dose rate and permanent implants for prostate cancer treatment

    Science.gov (United States)

    Seeley, Kaelyn; Cunha, J. Adam; Hong, Tae Min

    2017-01-01

    We discuss an improvement in brachytherapy--a prostate cancer treatment method that directly places radioactive seeds inside target cancerous regions--by optimizing the current standard for delivering dose. Currently, the seeds' spatiotemporal placement is determined by optimizing the dose based on a set of physical, user-defined constraints. One particular approach is the ``inverse planning'' algorithms that allow for tightly fit isodose lines around the target volumes in order to reduce dose to the patient's organs at risk. However, these dose distributions are typically computed assuming the same biological response to radiation for different types of tissues. In our work, we consider radiobiological parameters to account for the differences in the individual sensitivities and responses to radiation for tissues surrounding the target. Among the benefits are a more accurate toxicity rate and more coverage to target regions for planning high-dose-rate treatments as well as permanent implants.

  17. SU-F-BRA-03: Integrating Novel Electromagnetic Tracking Hollow Needle Assistance in Permanent Implant Brachytherapy Procedures

    Energy Technology Data Exchange (ETDEWEB)

    Racine, E; Hautvast, G; Binnekamp, D [Philips Group Innovation - Biomedical Systems, Eindhoven (Netherlands); Beaulieu, L [Centre Hospitalier Univ de Quebec, Quebec, QC (Canada)

    2015-06-15

    Purpose: To report on the results of a complete permanent implant brachytherapy procedure assisted by an electromagnetic (EM) hollow needle possessing both 3D tracking and seed drop detection abilities. Methods: End-to-end in-phantom EM-assisted LDR procedures were conducted. The novel system consisted of an EM tracking apparatus (NDI Aurora V2, Planar Field Generator), a 3D US scanner (Philips CX50), a hollow needle prototype allowing 3D tracking and seed drop detection and a specially designed treatment planning software (Philips Healthcare). A tungsten-doped 30 cc spherical agarose prostate immersed in gelatin was used for the treatment. A cylindrical shape of 0.8 cc was carved along its diameter to mimic the urethra. An initial plan of 26 needles and 47 seeds was established with the system. The plan was delivered with the EM-tracked hollow needle, and individual seed drop locations were recorded on the fly. The phantom was subsequently imaged with a CT scanner from which seed positions and contour definitions were obtained. The DVHs were then independently recomputed and compared with those produced by the planning system, both before and after the treatment. Results: Of the 47 seeds, 45 (96%) were detected by the EM technology embedded in the hollow needle design. The executed plan (from CT analysis) differed from the initial plan by 2%, 14% and 8% respectively in terms of V100, D90 and V150 for the prostate, and by 8%, 7% and 10% respectively in terms of D5, V100 and V120 for the urethra. Conclusion: The average DVH deviations between initial and executed plans were within a 5% tolerance imposed for this proof-of-concept assessment. This relatively good concordance demonstrates the feasibility and potential benefits of combining EM tracking and seed drop detection for real-time dosimetry validation and assistance in permanent implant brachytherapy procedures. This project has been entirely funded by Philips Healthcare.

  18. Tissue distribution and excretion of 125I-lidamycin in mice and rats

    Institute of Scientific and Technical Information of China (English)

    You-Ping Liu; Quan-Sheng Li; Yu-Rong Huang; Chang-Xiao Liu

    2005-01-01

    AIM: To investigate the tissue distribution, urinary and fecal excretions of 125I-lidamycin (125I-C-1027) in mice and its biliary excretion in rats.METHODS: The total radioactivity assay (RA method) and the radioactivity assay after precipitation with 200 mL/L trichloroacetic acid (TCA-RA method) were used to dete-rmine the tissue distribution, and the urinary and fecal excretions of 125I-C-1027 in mice and its biliary excretion in rats.RESULTS: Tissue concentrations reached the peak at the fifth minute after administration of 125I-C-1027 to mice. The highest concentration was in kidney, and the lowest in brain at all test-time points. The organs of the concentrations of 125I-C-1027 from high to low were kidney, lung, liver, stomach, spleen, uterus, ovary, intestine, muscle, heart, testis, fat, and brain in mice. The accumulative excretionamounts of 0-24 h, and 0-96 h after administration of125I-C-1027 were 68.36 and 71.64% in urine, and 2.60 and 3.21% in feces of mice, respectively, and the accumulative excretion amount of 0-24 h was 3.57% in bile in rats.CONCLUSION: Our results reflect the characteristics of the tissue distribution, urinary and fecal excretions of 125IC-1027 in mice and the biliary excretion of 125I-C-1027and its metabolites in rats, and indicate that 125I-C-1027and its metabolites are mainly distributed in kidney, and excreted in urine.

  19. Permanent transvenous pacemaker implantation in a patient with Cor triatriatum dextrum

    Institute of Scientific and Technical Information of China (English)

    Kun; Xiang; George; V; Moukarbel; Blair; Grubb

    2015-01-01

    Cor triatriatum dextrum is an extremely rare congenital heart abnormality in which the right atrium is separatedinto two chambers by a persistent fibrous membrane. A transvenous approach to place a dual-chamber pacemaker in such patients is technically challenging. We report the first case of a transvenous permanent pacemaker placement in a patient with cor triatriatum dextrum. An 87-year-old woman was diagnosed with paroxysmal atrial fibrillation. She was accidentally found to have cor triatriatum dextrum during the transesophageal echocardiography(TEE) prior to cardioversion. Later during her hospital stay, it was indicated to place a permanant pacemaker due to high grade atrioventricular block. After thorough reviewing TEE imagings, a transvenous catheter-based approach was decided feasible. Patient successfully received a dual chamber pacemaker through left subclavian venous approach. Furthermore in our case, using specially designed pacemaker leads and cautious intra-procedural maneuvering under fluoroscopic guidance ensured procedural success. In summary, a thorough pre-operative evaluation with transesophageal echocardiography is critical for the planning and eventual success of the transvenous placement of rightsided leads.

  20. The brachytherapy by implants of iodine 125 in the localised prostate cancer; La curietherapie par implants permanents d'iode 125 dans le cancer de la prostate localise

    Energy Technology Data Exchange (ETDEWEB)

    Cecconi, A.; Guido, A.; Vicenzi, L.; Galuppi, A.; Barbieri, E. [U.O. Radioterapia, Policlinico S.-Orsola-Malpighi, Bologne (Italy)

    2007-11-15

    The brachytherapy by permanent iodine 125 implants is in the localised prostate cancer a clinical treatment well tolerated and characterized by a limited toxicity: the urinary flow before implantation is an important factor of evolution prediction of the acute urinary toxicity, especially with regard to acute urinary retention. The important number of gains implanted near urethra is responsible of the acute urinary toxicity. All patients were in a state of complete remission with a decrease in the concentration of serum P.S.A. to eight months. (N.C.)

  1. Assaying multiple 125I seeds with the well-ionization chamber SourceCheck4π 33005 and a new insert

    Science.gov (United States)

    Ballester, Facundo; Perez-Calatayud, Jose; Vijande, Javier

    2015-01-01

    Purpose To provide a practical solution that can be adopted in clinical routine to fulfill the AAPM-ESTRO recommendations regarding quality assurance of seeds used in prostate permanent brachytherapy. The aim is to design a new insert for the well-ionization chamber SourceCheck4π 33005 (PTW, Germany) that allows evaluating the mean air-kerma strength of up to ten 125I seeds with one single measurement instead of measuring each seed individually. Material and methods The material required is: a) the SourceCheck4π 33005 well-ionization chamber provided with a PTW insert to measure the air-kerma strength S K of one single seed at a time; b) a newly designed insert that accommodates ten seeds in one column, which allows measuring the mean S K of the ten seeds in one single measurement; and c) a container with ten seeds from the same batch and class of the seeds used for the patient implant, and a set of nine non-radioactive seeds. The new insert is characterized by determining its calibration coefficient, used to convert the reading of the well-chamber when ten seeds are measured to their mean S K. The proposed method is validated by comparing the mean S K of the ten seeds obtained from the new insert with the individual measurement of S K of each seed, evaluated with the PTW insert. Results The ratio between the calibration coefficient of the new insert and the calibration coefficient of the PTW insert for the SourceCheck4π 33005 is 1.135 ± 0.007 (k = 1). The mean S K of a set of ten seeds evaluated with this new system is in agreement with the mean value obtained from measuring independently the S K of each seed. Conclusions The new insert and procedure allow evaluating the mean S K of ten seeds prior to the implant in a single measurement. The method is faster and more efficient from radiation protection point of view than measuring the individual S K of each seed. PMID:26816507

  2. Use of brachytherapy with permanent implants of iodine-125 in localized prostate cancer; La curietherapie par implants permanents d'I-125 dans le cancer localise de la prostate

    Energy Technology Data Exchange (ETDEWEB)

    Bladou, F.; Serment, G. [Hopital Salvador, Service d' Urologie, 13 - Marseille (France); Salem, N.; Simonian, M. [Hopital Salvador, Dept. de Radiotherapie, 13 - Marseille (France); Rosello, R.; Ternier, F. [Institut Paoli-Calmettes, Dept. de Radiologie, 13 - Marseille (France)

    2002-07-01

    Approximately 15,000 cases of early stage prostate cancer T1 and T2 are diagnosed every year in France by testing for PSA and performing prostatic biopsies. The treatment of these localized forms is based in most cases on radical prostatectomy or nn external beam radiotherapy. Although the ontological results obtained by these two therapeutic methods are satisfactory and equivalent in the long term, the side effects can be important. For a number of years, trans-perineal brachytherapy using permanent implants of iodine -125 or palladium-103 has proved itself as an alternative therapy with equivalent medium to long-term results. The low urinary, digestive and sexual side effects of prostate brachytherapy are important reasons for the enthusiasm among patients and the medical community for this therapy and the growing number of applications and centres which practice it. In September 1998 we started the prostate brachytherapy programmes- in Marseilles with close collaboration between the department of urology of the Hopital Salvator, and the departments of radiotherapy, medical imaging and medical physics of the Institut Paoli-Calmettes. To date, around 250 patients with localized adenocarcinoma of the prostate have benefited from this alternative therapy in our centre. Preliminary results, with a 3 year-follow-up, are comparable to results published in the literature by pioneer teams. (authors)

  3. Long-term outcome in patients receiving permanent pacemaker implantation for atrioventricular block: Comparison of VDD and DDD pacing.

    Science.gov (United States)

    Liao, Jo-Nan; Chao, Tze-Fan; Tuan, Ta-Chuan; Kong, Chi-Woon; Chen, Shih-Ann

    2016-08-01

    A permanent pacemaker (PPM) with dual chamber pacing (DDD) offers atrioventricular synchronization for patients with atrioventricular block (AVB). Single lead atrial synchronous ventricular pacing mode (VDD) is an alternative, but there are concerns about its efficacy and risk of atrial undersensing. Whether VDD can be a good alternative in patients with AVB remains unknown. The aim of the present study was to compare the long-term risk of mortality of VDD with DDD pacing.A total of 207 patients undergoing PPM implantations for AVB with VDD mode were enrolled from 2000 to 2013. Another 828 age- and sex-matched patients undergoing DDD implantations during the same period of time were selected as the control group in a 1 to 4 ratio. The study endpoint was mortality.A total of 1035 patients (64.3% male) were followed up for 46.5 ± 43.2 months. The mean ages were 75.0 years for VDD, and 74.9 years for DDD. The Kaplan-Meier survival analysis showed no significant difference in long-term survival between the VDD and DDD groups (log-rank P = 0.313). After adjustment for baseline characteristics, the VDD and DDD groups had a similar long-term prognosis with an adjusted hazard ratio of 0.875 (P = 0.445). Further analyses for the risk of cardiovascular and noncardiovascular deaths also showed no significant differences between the 2 groups.The long-term prognosis of VDD mode is comparable to that of DDD mode. Single lead VDD can be considered as an alternative choice in patients with AVB without sinus nodal dysfunction.

  4. Simulation of 125I induced DNA strand breaks in a CAP-DNA complex.

    Science.gov (United States)

    Li, W; Friedland, W; Jacob, P; Paretzke, H G; Panyutin, I; Neumann, R D

    2002-01-01

    The E. coli catabolite gene activator protein (CAP)-DNA complex with 125I located at the position of the H5 atom of the cytosine near the centre was incorporated into the PARTRAC track structure code. DNA strand breaks due to irradiation were calculated by track structure and radical attack simulations; strand breaks due to neutralisation of the highly charged 125Te ion were derived from a semi-empirical distribution. According to the calculations, the neutralisation effect dominates the strand breakage frequency at 2 bases away from the 125I decay site on both strands. The first breakage distribution counted from a 32P labelled end on the strand with 125I agreed well with experimental data, but on the opposite strand, the calculated distribution is more concentrated around the decay site and its yield is about 20% larger than the measured data.

  5. Preparation of 125I-protein A usable for up to 10 months in immunoassays

    DEFF Research Database (Denmark)

    Dyrberg, T; Billestrup, Nils

    1984-01-01

    Chloramine-T iodination of protein A from Staphylococcus aureus and gel electrophoretic purification of the iodination mixture results in a stable tracer of high specific and functional activity. Following repeated gel electrophoresis of the tracer only a single component was observed. The specific...... activity of the 125I-protein A was between 30 and 55 muCi/micrograms. The binding of 125I-protein A to rabbit immunoglobulin exceeded 90% and the tracer competed effectively with unlabelled protein A in binding to cells incubated with sera containing surface antibodies. Storage of the tracer for up to 46...... weeks resulted in a moderate decrease in maximal binding to immunoglobulin (from 91% to 64%), in TCA precipitable radioactivity (from 97% to 80%) and an approx. 30% decrease in the ability to detect cell bound immunoglobulin. It is concluded that gel electrophoretic purification of 125I-protein...

  6. p-( sup 125 I)iodoclonidine is a partial agonist at the alpha 2-adrenergic receptor

    Energy Technology Data Exchange (ETDEWEB)

    Gerhardt, M.A.; Wade, S.M.; Neubig, R.R. (Univ. of Michigan Medical School, Ann Arbor (USA))

    1990-08-01

    The binding properties of p-(125I)iodoclonidine (( 125I)PIC) to human platelet membranes and the functional characteristics of PIC are reported. (125I)PIC bound rapidly and reversibly to platelet membranes, with a first-order association rate constant (kon) at room temperature of 8.0 +/- 2.7 x 10(6) M-1 sec-1 and a dissociation rate constant (koff) of 2.0 +/- 0.8 x 10(-3) sec-1. Scatchard plots of specific (125I)PIC binding (0.1-5 nM) were linear, with a Kd of 1.2 +/- 0.1 nM. (125I)PIC bound to the same number of high affinity sites as the alpha 2-adrenergic receptor (alpha 2-AR) full agonist (3H) bromoxidine (UK14,304), which represented approximately 40% of the sites bound by the antagonist (3H)yohimbine. Guanosine 5'-(beta, gamma-imido)triphosphate greatly reduced the amount of (125I)PIC bound (greater than 80%), without changing the Kd of the residual binding. In competition experiments, the alpha 2-AR-selective ligands yohimbine, bromoxidine, oxymetazoline, clonidine, p-aminoclonidine, (-)-epinephrine, and idazoxan all had Ki values in the low nanomolar range, whereas prazosin, propranolol, and serotonin yielded Ki values in the micromolar range. Epinephrine competition for (125I)PIC binding was stereoselective. Competition for (3H)bromoxidine binding by PIC gave a Ki of 1.0 nM (nH = 1.0), whereas competition for (3H)yohimbine could be resolved into high and low affinity components, with Ki values of 3.7 and 84 nM, respectively. PIC had minimal agonist activity in inhibiting adenylate cyclase in platelet membranes, but it potentiated platelet aggregation induced by ADP with an EC50 of 1.5 microM. PIC also inhibited epinephrine-induced aggregation, with an IC50 of 5.1 microM. Thus, PIC behaves as a partial agonist in a human platelet aggregation assay. (125I)PIC binds to the alpha 2B-AR in NG-10815 cell membranes with a Kd of 0.5 +/- 0.1 nM.

  7. Selective binding of 2-[{sup 125}I]iodo-nisoxetine to norepinephrine transporters in the brain

    Energy Technology Data Exchange (ETDEWEB)

    Kung, M.-P.; Choi, Seok-Rye; Hou, Catherine; Zhuang, Z.-P.; Foulon, Catherine; Kung, Hank F. E-mail: kunghf@sunmac.spect.upenn.edu

    2004-07-01

    A radioiodinated ligand, (R)-N-methyl-(2-[{sup 125}I]iodo-phenoxy)-3-phenylpropylamine, [{sup 125}I]2-INXT, targeting norepinephrine transporters (NET), was successfully prepared. A no-carrier-added product, [{sup 125}I]2-INXT, displayed a saturable binding with a high affinity (K{sub d}=0.06 nM) in the homogenates prepared from rat cortical tissues as well as from LLC-PK{sub 1} cells expressing NET. A relatively low number of binding sties (B{sub max}=55 fmol/mg protein) measured with [{sup 125}I]2-INXT in rat cortical homogenates is consistent with the value reported for a known NET ligand, [{sup 3}H]nisoxetine. Competition studies with various compounds on [{sup 125}I]2-INXT binding clearly confirmed the pharmacological specificity and selectivity for NET binding sites. Following a tail-vein injection of [{sup 125}I]2-INXT in rats, a good initial brain uptake was observed (0.56% dose at 2 min) followed by a slow washout from the brain (0.2% remained at 3 hours post-injection). The hypothalamus (a NET-rich region) to striatum (a region devoid of NET) ratio was 1.5 at 3 hours post-i.v. injection. Pretreatment of rats with nisoxetine significantly inhibited the uptake of [{sup 125}I]2-INXT (70-100% inhibition) in locus coeruleus, hypothalamus and raphe nuclei, regions known to have a high density of NET; whereas escitalopram, a serotonin transporter ligand, did not show a similar effect. Ex vivo autoradiography of rat brain sections of [{sup 125}I]2-INXT (at 3 hours after an i.v. injection) displayed an excellent regional brain localization pattern corroborated to the specific NET distribution in the brain. The specific brain localization was significantly reduced by a dose of nisoxetine pretreatment. Taken together, the data suggest that [{sup 123}I]2-INXT may be useful for mapping NET binding sites in the brain.

  8. CT-guided {sup 125}I brachytherapy for mediastinal metastatic lymph nodes recurrence from esophageal carcinoma: Effectiveness and safety in 16 patients

    Energy Technology Data Exchange (ETDEWEB)

    Gao, Fei, E-mail: gaof@sysucc.org.cn [State Key Laboratory of Oncology in South China, Guangzhou 510060 (China); Department of Interventional Radiology, Sun Yat-sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060 (China); Li, Chuanxing, E-mail: licx@sysucc.org.cn [State Key Laboratory of Oncology in South China, Guangzhou 510060 (China); Department of Interventional Radiology, Sun Yat-sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060 (China); Gu, Yangkui, E-mail: guyk@sysucc.org.cn [State Key Laboratory of Oncology in South China, Guangzhou 510060 (China); Department of Interventional Radiology, Sun Yat-sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060 (China); Huang, Jinhua, E-mail: huangjh@sysucc.org.cn [State Key Laboratory of Oncology in South China, Guangzhou 510060 (China); Department of Interventional Radiology, Sun Yat-sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060 (China); Wu, Peihong, E-mail: vivian-link@163.com [State Key Laboratory of Oncology in South China, Guangzhou 510060 (China); Department of Interventional Radiology, Sun Yat-sen University Cancer Center, 651 Dongfeng Road East, Guangzhou 510060 (China)

    2013-02-15

    Objectives: To retrospectively evaluate effectiveness and safety of CT-guided {sup 125}I brachytherapy in 16 patients with mediastinal metastatic lymph nodes recurrence from esophageal carcinoma. Materials and methods: Sixteen metastatic lymph nodes in 16 patients were percutaneously treated in 19 {sup 125}I brachytherapy sessions. Each metastatic lymph node was treated with computed tomographic (CT) guidance. Follow-up contrast material-enhanced CT or positron emission tomographic (PET) scans were reviewed and the treatment's effectiveness was evaluated. Results: Months are counted from the first time of {sup 125}I brachytherapy and the median duration of follow-up was 11 months (range, 5–16 months). The local control rates after 3, 6, 10 and 15 months were 75.0, 50.0, 42.9 and 33.3% respectively. At the time of writing, four patients are alive without evidence of recurrence at 16, 9, 16 and 9 months. The 4 patients presented good control of local tumor and no systemic recurrence, and survived throughout the follow-up period. The other 12 patients died of multiple hematogenous metastases 5–15 months after brachytherapy. A small amount of local hematoma occurred in 2 patients that involved applicator insertion through the lung. Two patients presented pneumothorax with pulmonary compression of 30 and 40% after the procedure and recovered after drainage. One patient had minor displacement of radioactive seeds. Severe complications such as massive bleeding and radiation pneumonitis did not occur. Conclusion: {sup 125}I radioactive seed implantation is effective and may be safely applied to mediastinal metastatic lymph nodes recurrence from esophageal carcinoma.

  9. Uptake and modification of 125I-lipopolysaccharide by isolated rat Kupffer cells.

    Science.gov (United States)

    Fox, E S; Thomas, P; Broitman, S A

    1988-01-01

    While it is generally believed that hepatic clearance of lipopolysaccharide involves Kupffer cells, the mechanism involved has not been fully elucidated. This study assesses this phenomenon in terms of in vitro uptake and post-uptake modification experiments with an 125I-labeled Salmonella minnesota lipopolysaccharide. 125I-Lipopolysaccharide was added to Kupffer cells in suspension cultures under a variety of conditions. In vitro uptake of 125I-Lipopolysaccharide was not saturable up to concentrations of 33.33 micrograms per ml. Kinetics experiments performed at 16.67 micrograms per ml demonstrated that Kupffer cells were unsaturable after 60 min of incubation. The kinetics of uptake could be inhibited, however, by incubation in the presence of a 10-fold excess of unlabeled lipopolysaccharide, indicating that a component of the uptake process may be limited. Energy dependence in this process was demonstrated by incubation in the presence of 1 mM 2-deoxyglucose which inhibited 125I-lipopolysaccharide uptake by approximately 30%. Pretreatment with 7.5 x 10(-5) M colchicine had no effect on kinetics, implying no role for the cell cytoskeleton in lipopolysaccharide uptake. These results are inconsistent with a receptor-mediated process as previously suggested. Modification of internalized label has been demonstrated by changes in buoyant density in CsCl isopyknic density gradients following overnight incubation with Kupffer cells. These results indicate that Kupffer cells clear bacterial endotoxin in vitro and post-uptake degradation occurs within 20 hr of incubation.

  10. Preparation and Purification of 125I With Neutron Irradiated Xenon in a Vacuum Circular system

    Institute of Scientific and Technical Information of China (English)

    MIAOZeng-xing; LIYu-cheng; YUNing-wen; WUJie; XIANGXue-qin; ZHAOXiu-yan

    2003-01-01

    This paper describes the preparation and purification of 125I with neutron irradiated xenon in a vacuum circular system, which is specially designed with an irradiate chamber set inside of the reactor and three decay chambers set outside of the reactor. The xenon is filled in this system and recurrently circulates between the irradiate chamber and the decay chambers during the reactor is operating.

  11. Photoaffinity labelling of the rat liver nuclear thyroid hormone receptor with (/sup 125/I)triiodothyronine

    Energy Technology Data Exchange (ETDEWEB)

    David-Inouye, Y. (Univ. of California, San Francisco); Somack, R; Nordeen, S.K.; Apriletti, J.W.; Baxter, J.D.; Eberhardt, N.L.

    1982-11-01

    (/sup 125/I)Triiodothyronine (T/sub 3/) was used as a photoreactive probe for the thyroid hormone nuclear receptor in photoaffinity labelling experiments. Autoradiograms of photolysis products electrophoresed on either one or two-dimensional gels showed that (/sup 125/I)T/sub 3/ covalently, but nonspecifically, labelled many proteins in the partially purified receptor preparations used. However, one of these proteins with an estimated molecular weight of 47,000 and an isoelectric point of approximately 6.2 +/- 0.5 pH units appears to be the thyroid hormone receptor, since, in contrast to the other proteins, its photoinduced labelling was blocked by concentrations of T/sub 3/ and thyroxine (T/sub 4/) similar to those that inhibit binding of (/sup 125/I)T/sub 3/ by the receptor in equilibrium binding assays. In addition, the isoelectric point of the photolabelled protein agrees with that determined in separate equilibrium isoelectric focusing studies. These results indicate that (/sup 125/I)T/sub 3/ can serve as a photoreactive probe for the thyroid hormone nuclear receptor, and they suggest that this receptor is a single polypeptide chain of molecular weight 47,000 with an isoelectric point of 6.2 +/- 0.5 pH units.

  12. Synthesis and biodistribution of [125I]iodo- and [75Se]seleno-ergoline derivatives.

    Science.gov (United States)

    Sadek, S; Basmadjian, G; Patel, A

    1987-01-01

    (8 beta)-8-([125]Iodomethyl)-6-propylergoline (125I-3) was prepared by refluxing the mesyl analog with Na125I in methyl-ethyl-ketone, followed by HPLC, in a radiochemical yield greater than 70%. [75Se]Selenopergolide (75Se-2) was prepared in 74% yield starting with H75(2) SeO3. The biodistribution studies of the two compounds in male rats show good uptake by the adrenals and the brain. Compound 75Se-2 had higher adrenal uptake and adrenal-to-blood ratios (4.2% dose/g and 70:1) than 125I-3 (3.6% dose/g and 23.8:1) at 15 min post injection. The two compounds had almost equal brain uptake (0.91% dose/g for 75Se-2 and 1.14% dose/g for 125I-3), but 75Se-2 showed higher brain-to-blood ratios (15.2:1 vs 7.3:1) at 15 min post injection. This study indicates that 75Se-2 and 123I-3 may be useful agents for imaging the adrenal and the brain.

  13. Cortisol decreases 2[[sup 125]I] iodomelatonin binding sites in the duck thymus

    Energy Technology Data Exchange (ETDEWEB)

    Poon, A.M.S.; Liu, Z.M.; Tang, F.; Pang, S.F. (Univ. of Hong Kong (China))

    1994-03-01

    The immunosuppressive effect of chronic glucocorticoid treatment on 2[[sup 125]I] iodomelatonin binding in the duck thymus was studied. Two-week-old ducks were injected intraperitoneally with either 1 mg of cortisol per day (experimental group) or an equivalent volume of vehicle (control group) in the middle of the light period for seven days. 2[[sup 125]I] iodomelatonin binding assays were performed on thymic membranes. Cortisol injection reduced the body weight gain, size of the bursa of Fabricius and absolute weights of the primary lymphoid organs but had no effect on the spleen weights. The relative weights of the spleen were increased while those of the primary lymphoid organs were unchanged. The density of the thymus 2[[sup 125]I] iodomelatonin binding sites was decreased while the affinity was not affected. The modulation of the thymic 2[[sup 125]I] iodomelatonin binding sites by changes in the immune status of the duck suggests that these binding sites represent physiologically relevant melatonin receptors and that melatonin exerts its action on the lymphoid tissues directly. The authors findings support the hypothesis that the thymus is the target site for the immunomodulatory interactions between the pineal melatonin and the adrenal steroids. A possible inhibitory influence of adrenal steroids on the immuno-enhancing effect of melatonin is also suggested. 34 refs., 3 tabs.

  14. A novel {sup 125}I-labeled daunorubicin derivative for radionuclide-based cancer therapy

    Energy Technology Data Exchange (ETDEWEB)

    Ickenstein, Ludger M. [Department of Physical and Analytical Chemistry, Uppsala University, P.O. Box 579, 75121 Uppsala (Sweden); Edwards, Katarina [Department of Physical and Analytical Chemistry, Uppsala University, P.O. Box 579, 75121 Uppsala (Sweden); Sjoeberg, Stefan [Department of Biochemistry and Organic Chemistry, Uppsala University, P.O. Box 576, 75123 Uppsala (Sweden); Carlsson, Joergen [Rudbeck Laboratory, Division of Biomedical Radiation Sciences, Department of Oncology, Radiology and Clinical Immunology, Uppsala University, 75185 Uppsala (Sweden); Gedda, Lars [Rudbeck Laboratory, Division of Biomedical Radiation Sciences, Department of Oncology, Radiology and Clinical Immunology, Uppsala University, 75185 Uppsala (Sweden) and Rudbeck Laboratory, Division of Experimental Urology, Department of Surgery, Uppsala University, 75185 Uppsala (Sweden)]. E-mail: lars.gedda@bms.uu.se

    2006-08-15

    Introduction: Auger electron emitters, such as {sup 125}I, are getting increasingly wider recognition as alternatives to current anticancer treatments. The effectiveness of Auger electrons is strongly dependent on their proximity to DNA and is therefore considered as harmless outside the nucleus. Methods: {sup 125}I or {sup 127}I was conjugated with Comp1, Comp2 or Comp3 - three derivatives of the chemotherapeutic drug daunorubicin. Their capacity factors, DNA-binding constants and exclusion parameters, and the degree of DNA fragmentation after incubating isolated DNA with our {sup 127}I- or {sup 125}I-conjugated daunorubicin derivatives were determined. Human breast adenocarcinoma (SK-BR-3) cells were incubated with the derivatives; fluorescent microscopy and autoradiography images were generated; and cell growth was monitored. Results and Discussion: The capacity factor of {sup 127}I-Comp1 was similar to those of daunorubicin and doxorubicin, whereas lower capacity factors of {sup 127}I-Comp2 and {sup 127}I-Comp3 suggested reduced interactions with lipid membranes. DNA exclusion parameters and binding constants of {sup 127}I-Comp1 and {sup 127}I-Comp2, but not of {sup 127}I-Comp3, were similar to those of doxorubicin. Fluorescent microscopy and autoradiography images of SK-BR-3 cells revealed that {sup 127}I-Comp1 and {sup 125}I-Comp1 accumulated in tumor cell nuclei, whereas {sup 127}I-Comp2 and {sup 127}I-Comp3 were present predominantly in other cell compartments. The binding of {sup 125}I-Comp1 to isolated chromosomal DNA led to major fragmentation. Incubation of SK-BR-3 cells with {sup 125}I-Comp1 inhibited cell growth, whereas doxorubicin or {sup 127}I-Comp1 administered at the same concentration had no effect on cell growth. Our results thus suggest that {sup 125}I-Comp1 has the potential to become a new tool for anticancer therapy.

  15. Dosimetric analysis of 123I, 125I and 131I in thyroid follicle models

    Science.gov (United States)

    2014-01-01

    Background Radioiodine is routinely used or proposed for diagnostic and therapeutic purposes: 123I, 125I and 131I for diagnostics and 125I and 131I for therapy. When radioiodine-labelled pharmaceuticals are administered to the body, radioiodide might be released into the circulation and taken up by the thyroid gland, which may then be an organ at risk. The aim of this study was to compare dosimetric properties for 123I, 125I and 131I in previously developed thyroid models for man, rat and mouse. Methods Dosimetric calculations were performed using the Monte Carlo code MCNPX 2.6.0 and nuclear decay data from ICRP 107. Only the non-radiative transitions in the decays were considered. The S value was determined for the cell nuclei in species-specific thyroid follicle models for mouse, rat and man for different spatial distributions of radioiodine. Results For the species-specific single follicle models with radioiodine homogeneously within the follicle lumen, the highest S value came from 131I, with the largest contribution from the β particles. When radioiodine was homogeneously distributed within the follicle cells or the follicle cell nucleus, the highest contribution originated from 125I, about two times higher than 123I, with the largest contribution from the Auger electrons. The mean absorbed dose calculated for our human thyroid multiple follicle model, assuming homogenous distribution of for 123I, 125I, or 131I within the follicle lumens and follicle cells, was 9%, 18% and 4% higher, respectively, compared with the mean absorbed dose according to Medical Internal Radiation Dose (MIRD) formalism and nuclear decay data. When radioiodine was homogeneously distributed in the follicle lumens, our calculations gave up to 90% lower mean absorbed dose for 125I compared to MIRD (20% lower for 123I, and 2% lower for 131I). Conclusions This study clearly demonstrates the importance of using more detailed dosimetric methods and models than MIRD formalism for radioiodine

  16. 直视下永久性人工鼻泪管植入术的临床应用%Clinical application of permanent artificial nasolacrimal duct implantation

    Institute of Scientific and Technical Information of China (English)

    张弘

    2015-01-01

    目的 评价泪道手术失败后永久性人工鼻泪管植入术的临床效果.方法 对经过手术治疗后复发的慢性泪囊炎108例(110眼),进行泪囊鼻腔吻合术并直视下植入永久性人工鼻泪管.结果 直视下植入人工鼻泪管的手术效果良好,术后1月和1年复查,有效率均为100%.结论 采用泪囊鼻腔吻合术的同时植入永久性人工鼻泪管,该方法将人工鼻泪管准确植入泪囊窝位置,准确,可靠,有效率高.%Objective To evaluate the clinical effect of permanent artificial nasolacrimal duct implantation for lacrimal surgical failed cases.Methods The permanent artificial nasolacrimal duct was implanted in 110 eyes of 108 recurrent chronic dacryocystitis cases after failed lacrimal surgery.Results One year after operation,the irrigation of lacrimal passage was patent in all cases.The surgical effective rate was 100%.Conclusion The implantation of permanent artificial nasolacrimal duct is a safe and reliable with high effective rate method for lacrimal surgical failed cases.

  17. (/sup 125/I) radioiodinated metaraminol: A new platelet-specific labeling agent

    Energy Technology Data Exchange (ETDEWEB)

    Ohmomo, Y.; Yokoyama, A.; Kawai, K.; Arano, Y.; Horiuchi, K.; Tanaka, C.; Saji, H.; Torizuka, K.

    1985-03-01

    In our search for a platelet-specific labeling agent, metaraminol (MA), a low-toxic pharmaceutical for the treatment of hypotension and cardiogenic shock, attracted our attention. Its active incorporation and accumulation by platelets have been recognized. At first, the preparation of /sup 125/I radioiodinated metaraminol (/sup 125/I-MA) was carried out using the chloramine-T method. Then, upon the harvest of platelets as platelet-rich plasma (PRP), their labeling with this new radiopharmaceutical was easily performed by incubation for 10 min at 37/sup 0/C. The cell-labeling efficiency was dependent on cell density, reaching 63.0%+-3.1% at 2.4x10/sup 9/ cells/ml. The specific incorporation of /sup 125/I-MA by an active transport system similar to that of 5-hydroxytryptamine (5-HT) as well as by passive diffusion was demonstrated. In vitro studies, the unaltered state of /sup 125/I-MA-labeled platelets with their cellular functions fully retained was estimated. In vivo studies carried out in rabbits with induced thrombi in the femoral artery showed a rather rapid disappearance of the radioactivity from circulating blood, reaching a high thrombus-to-blood activity ratio of 19.8+-4.3 within 30 min of the administration of /sup 125/I-MA-labeled autologous platelets. Thus, with the potential availability of /sup 123/I, /sup 123/I-MA-labeled platelets appear to be a promising agent for thrombus imaging using single-emission computed tomography (CT) studies.

  18. Identification of β2-adrenoceptors on guinea pig alveolar macrophages using (-)-3-[125I]iodocyanopindolol

    NARCIS (Netherlands)

    R. Leurs (R.); F.D. Beusenberg; R.C. Bast (Robert); J.G.C. van Amsterdam (Jan); H. Timmerman (H.)

    1990-01-01

    textabstractThe β-adrenoceptor antagonist (-)-3-[125I]iodocyanopindolol ([125I]ICYP) binds with high affinity and in a saturable way to membranes of guinea pig alveolar macrophages. The equilibrium dissociation constant for [125I]ICYP is 24.3 ± 1.2 pM, and the number of binding sites is 166.3 ± 13.7

  19. Long-Term Efficacy and Toxicity of Low-Dose-Rate {sup 125}I Prostate Brachytherapy as Monotherapy in Low-, Intermediate-, and High-Risk Prostate Cancer

    Energy Technology Data Exchange (ETDEWEB)

    Kittel, Jeffrey A.; Reddy, Chandana A.; Smith, Kristin L.; Stephans, Kevin L.; Tendulkar, Rahul D. [Department of Radiation Oncology, Cleveland Clinic Taussig Cancer Institute, Cleveland, Ohio (United States); Ulchaker, James; Angermeier, Kenneth; Campbell, Steven; Stephenson, Andrew; Klein, Eric A. [Department of Urology, Cleveland Clinic Glickman Urological and Kidney Institute, Cleveland, Ohio (United States); Wilkinson, D. Allan [Department of Radiation Oncology, Cleveland Clinic Taussig Cancer Institute, Cleveland, Ohio (United States); Ciezki, Jay P., E-mail: ciezkij@ccf.org [Department of Radiation Oncology, Cleveland Clinic Taussig Cancer Institute, Cleveland, Ohio (United States)

    2015-07-15

    Purpose/Objectives: To report long-term efficacy and toxicity for a single-institution cohort of patients treated with low-dose-rate prostate brachytherapy permanent implant (PI) monotherapy. Methods and Materials: From 1996 to 2007, 1989 patients with low-risk (61.3%), intermediate-risk (29.8%), high-intermediate-risk (4.5%), and high-risk prostate cancer (4.4%) were treated with PI and followed up prospectively in a registry. All patients were treated with {sup 125}I monotherapy to 144 Gy. Late toxicity was coded retrospectively according to a modified Common Terminology Criteria for Adverse Events 4.0 scale. The rates of biochemical relapse-free survival (bRFS), distant metastasis-free survival (DMFS), overall survival (OS), and prostate cancer–specific mortality (PCSM) were calculated. We identified factors associated with late grade ≥3 genitourinary (GU) and gastrointestinal (GI) toxicity, bRFS, DMFS, OS, PCSM, and incontinence. Results: The median age of the patients was 67 years, and the median overall and prostate-specific antigen follow-up times were 6.8 years and 5.8 years, respectively. The overall 5-year rates for bRFS, DMFS, OS, and PCSM were 91.9%, 97.8%, 93.7%, and 0.71%, respectively. The 10-year rates were 81.5%, 91.5%, 76.1%, and 2.5%, respectively. The overall rates of late grade ≥3 GU and GI toxicity were 7.6% and 0.8%, respectively. On multivariable analysis, age and prostate length were significantly associated with increased risk of late grade ≥3 GU toxicity. The risk of incontinence was highly correlated with both pre-PI and post-PI transurethral resection of the prostate. Conclusions: Prostate brachytherapy as monotherapy is an effective treatment for low-risk and low-intermediate-risk prostate cancer and appears promising as a treatment for high-intermediate-risk and high-risk prostate cancer. Significant long-term toxicities are rare when brachytherapy is performed as monotherapy.

  20. Synthesis and binding characteristics of N-(1-naphthyl)-N'-(3-[{sup 125}I]-iodophenyl)-N'-methylguanidine ([{sup 125}I]-CNS 1261): a potential SPECT agent for imaging NMDA receptor activation

    Energy Technology Data Exchange (ETDEWEB)

    Owens, Jonathan E-mail: j.owens@clinmed.gla.ac.uk; Tebbutt, Andrew A.; McGregor, Ailsa L.; Kodama, K.; Magar, Sharad S.; Perlman, Michael E.; Robins, David J.; Durant, Graham J.; McCulloch, James

    2000-06-01

    N-(1-Naphthyl)-N'-(3-[{sup 125}I]-iodophenyl)-N'-methylguanidine ([{sup 125}I]-CNS 1261) was synthesized as a potential radioligand to image N-methyl-D-aspartate (NMDA) receptor activation. [{sup 125}I]-CNS 1261 was prepared by radioiodination of N-(1-naphthyl)-N'-(3-tributylstannylphenyl)-N'-methylguanidine using Na{sup 125}I and peracetic acid. [{sup 125}I]-CNS 1261 uptake in vivo reflected NMDA receptor distribution in normal rat brain, whereas in ischemic rat brain, uptake was markedly increased in areas of NMDA receptor activation. Radiolabeled CNS 1261 appears to be a good candidate for further development as a single photon emission computed tomography tracer in the investigation of NMDA receptor activation in cerebral ischemia.

  1. PSA bounce after {sup 125}I-brachytherapy for prostate cancer as a favorable prognosticator

    Energy Technology Data Exchange (ETDEWEB)

    Engeler, Daniel S.; Schwab, Christoph; Schmid, Hans-Peter [Cantonal Hospital St. Gallen, Department of Urology, St. Gallen (Switzerland); Thoeni, Armin F. [Lindenhofspital Berne, Department of Radiation Oncology, Berne (Switzerland); Hochreiter, Werner [Hirslanden Klinik Aarau, Department of Urology, Aarau (Switzerland); Prikler, Ladislav [Klinik Uroviva Buelach, Department of Urology, Buelach (Switzerland); Suter, Stefan [Cantonal Hospital Zug, Department of Urology, Zug (Switzerland); Stucki, Patrick [Cantonal Hospital Lucerne, Department of Urology, Lucerne (Switzerland); Schiefer, Johann; Plasswilm, Ludwig; Putora, Paul Martin [Cantonal Hospital St. Gallen, Department of Radiation Oncology, St. Gallen (Switzerland)

    2015-10-15

    Permanent low-dose-rate brachytherapy (BT) with iodine 125 is an established curative treatment for localized prostate cancer. After treatment, prostate-specific antigen (PSA) kinetics may show a transient rise (PSA bounce). Our aim was to investigate the association of PSA bounce with biochemical control. Patients treated with BT in Switzerland were registered in a prospective database. Only patients with a follow-up of at least 2 years were included in our analysis. Clinical follow-up and PSA measurements were assessed after 1.5, 3, 6, and 12 months, and annually thereafter. If PSA increased, additional follow-up visits were scheduled. Cases of PSA bounce were defined as a rise of at least 0.2 ng/ml above the initial PSA nadir with a subsequent decline to or below the initial nadir without treatment. Biochemical failure was defined as a rise to nadir + 2 ng/ml. Between March 2001 and November 2010, 713 patients with prostate cancer undergoing BT with at least 2 years of follow-up were registered. Median follow-up time was 41 months. Biochemical failure occurred in 28 patients (3.9 %). PSA bounce occurred in 173 (24.3 %) patients; only three (1.7 %) patients with PSA bounce developed biochemical failure, in contrast to 25 (4.6 %) patients without previous bounce (p < 0.05). The median time to bounce was 12 months, the median time to biochemical failure was 30 months. The median bounce increase was 0.78 ng/ml. Twenty-eight patients with bounce (16.5 %) had a transient PSA rise of + 2 ng/ml above the nadir. In most cases, an early increase in PSA after BT indicates PSA bounce and is associated with a lower risk of biochemical failure. (orig.) [German] Die permanente Low-dose-rate-Brachytherapie (BT) mit {sup 125}I ist ein etabliertes kuratives Verfahren bei lokalisiertem Prostatakarzinom. Posttherapeutisch koennen die PSA-Konzentrationen einen voruebergehenden Anstieg zeigen (Bounce-Phaenomen). Untersucht werden sollte ein moeglicher Zusammenhang mit der

  2. Detection of IgG antibodies against Bordetella pertussis with /sup 125/I-protein A

    Energy Technology Data Exchange (ETDEWEB)

    Wirsing von Koenig, C.H.; Finger, H.

    1981-01-01

    A method for the detection of IgG antibodies against Bordetella pertussis is described, based on the principle of 'sandwich' radioimmunoassay. /sup 125/I protein A is used as radioactive tracer. The influence of amounts of antigen, antibody, radioactive tracer, incubation time and temperature were tested and the optimal conditions for the assay are described. The procedure offers a simple, quick, and sensitive method for detecting antibodies against B. pertussis. Application and limitation of the test are discussed.

  3. Photoaffinity labelling of the rat liver nuclear thyroid hormone receptor with (/sup 125/I)triiodothyronine

    Energy Technology Data Exchange (ETDEWEB)

    David-Inouye, Y.; Somack, R.; Nordeen, S.K.; Apriletti, J.W.; Baxter, J.D.; Eberhardt, N.L.

    1982-11-01

    (/sup 125/I)Triiodothyronine (T3) was used as a photoreactive probe for the thyroid hormone nuclear receptor in photoaffinity labelling experiments. Autoradiograms of photolysis products electrophoresed on either one or two-dimensional gels showed that (/sup 125/I)T3 covalently, but nonspecifically, labelled many proteins in the partially purified receptor preparations used. However, one of these proteins with an estimated molecular weight of 47,000 and an isoelectric point of approximately 6.2 +/- 0.5 pH units appears to be the thyroid hormone receptor, since, in contrast to the other proteins, its photoinduced labelling was blocked by concentrations of T3 and thyroxine (T4) similar to those that inhibit binding of (/sup 125/I)T3 by the receptor in equilibrium binding assays. In addition, the isoelectric point of the photolabelled protein agrees with that determined in separate equilibrium isoelectric focusing studies. These results indicate that (/sup 125/)T3 can serve as a photoreactive probe for the thyroid hormone nuclear receptor, and they suggest that this receptor is a single polypeptide chain of molecular weight 47,000 with an isoelectric point of 6.2 +/- 0.5 pH units.

  4. Radioactive seed localization with 125I for nonpalpable lesions prior to breast lumpectomy and/or excisional biopsy: methodology, safety, and experience of initial year.

    Science.gov (United States)

    Dauer, Lawrence T; Thornton, Cynthia; Miodownik, Daniel; Boylan, Daniel; Holahan, Brian; King, Valencia; Brogi, Edi; Morrow, Monica; Morris, Elizabeth A; St Germain, Jean

    2013-10-01

    The use of radioactive seed localization (RSL) as an alternative to wire localizations (WL) for nonpalpable breast lesions is rapidly gaining acceptance because of its advantages for both the patient and the surgical staff. This paper examines the initial experience with over 1,200 patients seen at a comprehensive cancer center. Radiation safety procedures for radiology, surgery, and pathology were implemented, and radioactive material inventory control was maintained using an intranet-based program. Surgical probes allowed for discrimination between 125I seed photon energies from 99mTc administered for sentinel node testing. A total of 1,127 patients (median age of 57.2 y) underwent RSL procedures with 1,223 seeds implanted. Implanted seed depth ranged from 10.3-107.8 mm. The median length of time from RSL implant to surgical excision was 2 d. The median 125I activity at time of implant was 3.1 MBq (1.9 to 4.6). The median dose rate from patients with a single seed was 9.5 µSv h-1 and 0.5 µSv h-1 at contact and 1 m, respectively. The maximum contact dose rate was 187 µSv h-1 from a superficially placed seed. RSL performed greater than 1 d before surgery is a viable alternative to WL, allowing flexibility in scheduling, minimizing day of surgery procedures, and improving workflow in breast imaging and surgery. RSL has been shown to be a safe and effective procedure for preoperative localization under mammographic and ultrasound guidance, which can be managed with the use of customized radiation protection controls.

  5. Characterization of the PTW SourceCheck ionization chamber with the Valencia lodgment for (125)I seed verification.

    Science.gov (United States)

    Tornero-López, Ana M; Torres Del Río, Julia; Ruiz, Carmen; Perez-Calatayud, Jose; Guirado, Damián; Lallena, Antonio M

    2015-12-01

    In brachytherapy using (125)I seed implants, a verification of the air kerma strength of the sources used is required. Typically, between 40 and 100 seeds are implanted. Checking all of them is unaffordable, especially when seeds are disposed in sterile cartridges. Recently, a new procedure allowing the accomplishment of the international recommendations has been proposed for the seedSelectron system of Elekta Brachytherapy. In this procedure, the SourceCheck ionization chamber is used with a special lodgment (Valencia lodgment) that allows to measure up to 10 seeds simultaneously. In this work we analyze this procedure, showing the feasibility of the approximations required for its application, as well as the effect of the additional dependence with the air density that shows the chamber model used. Uncertainty calculations and the verification of the approximation needed to obtain a calibration factor for the Valencia lodgment are carried out. The results of the present work show that the chamber dependence with the air density is the same whether the Valencia lodgment is used or not. On the contrary, the chamber response profile is influenced by the presence of the lodgment. The determination of this profile requires various measurements due to the nonnegligible variability found between different experiments. If it is considered, the uncertainty in the determination of the air-kerma strength increases from 0.5% to 1%. Otherwise, a systematic additional uncertainty of 1% would occur. This could be relevant for the comparison between user and manufacturer measurements that is mandatory in the case studied here.

  6. Validation of 125I-hCG as a marker for elimination of hCG and stability of 125I-hCG after in vivo injection in humans

    DEFF Research Database (Denmark)

    Christensen, T B; Marqversen, J; Engbaek, F;

    1999-01-01

    We have recently introduced 125I-hCG as an elimination marker in patients with human chorionic gonadotrophin (hCG) producing testicular cancer. 125I-hCG is a well-known reagent in clinical biochemistry and is used extensively in hCG assays. Previous studies have shown that the iodination process...... leaves the hCG molecule mainly intact. The iodination, purification and stability of 125I-hCG tracer are described. The aim of the present study was to determine whether or not 125I is associated with hCG after the injection of 125I-hCG intravenously (i.v.) in humans. Three different methods were used....... Following injection of 125I-hCG, the plasma disappearance of radioactivity and hCG were followed for a period of 28 days in 13 normal subjects. Serum from a normal healthy male following injection of 125I-hCG was analysed using a double antibody direct binding radioimmunoassay specific for holo-hCG and high...

  7. The incidence of radioepidermitis and the dose-response relationship in parotid gland cancer patients treated with 125I seed brachytherapy. Incidence of radioepidermitis and the dose-response relationship

    Energy Technology Data Exchange (ETDEWEB)

    Mao, Ming-Hui; Zheng, Lei; Gao, Hong; Zhang, Jie; Liu, Shu-ming; Huang, Ming-wei; Shi, Yan [Peking University School and Hospital of Stomatology, Department of Oral and Maxillofacial Surgery, Beijing (China); Zhang, Jian-Guo [Peking University School and Hospital of Stomatology, Department of Oral and Maxillofacial Surgery, Beijing (China); Fujian Provincial Hospital, Fujian (China)

    2014-09-09

    We studied the incidence and dose-response relationship of radioepidermitis in parotid gland carcinoma patients treated with [{sup 125}I] seed brachytherapy in the hopes of designing an optimized pre-implant treatment plan that would reduce the incidence and severity of radioepidermitis in patients receiving this therapy. Between January 2007 and May 2010, 100 parotid gland cancer patients were treated postoperatively with [{sup 125}I] seed brachytherapy. The matched peripheral dose (MPD) was 80-140 Gy, and [{sup 125}I] seed activity was 0.7-0.8 mCi. The mean dose delivered to the skin was calculated in the post-implant CT on day 0 following implantation. Grades of acute and late dermatitis were evaluated at 2, 6, 12, and 18 months post-implantation. Most patients experienced grade 0-2 acute and late skin side effects (86 and 97 %, respectively), though a small subset developed severe complications. Most grade 1-3 effects resolved within 6 months of implantation, though some grade 1-3 effects and all grade 4 effects remained unchanged throughout the 18-month follow-up period. Grade 3 and 4 effects were most prominent (75 and 25 %, respectively) with doses of 110-140 Gy; doses higher than 140 Gy produced only grade 4 effects. [{sup 125}I] seed brachytherapy produced acceptable levels of acute and late radioepidermitis with a good clinical outcome. A mean dose under 100 Gy delivered to the skin was safe, though doses of 110-140 Gy should be given with caution and extra monitoring; doses greater than 140 Gy are dangerous and likely to produce grade 4-5 effects. (orig.) [German] Wir untersuchten die Inzidenz und die Dosis-Wirkung-Beziehung bei Patienten mit Ohrspeicheldruesenkrebs, die mit [{sup 125}I]-Seed-Brachytherapie behandelt wurden, in der Hoffnung, eine optimierte praeimplantologische Behandlung zu entwickeln, welche die Inzidenz und Schwere der Radioepidermitis bei Patienten, die diese Therapie erhalten haben, reduziert. Zwischen Januar 2007 und Mai 2010

  8. A defense in depth approach to radiation protection for 125I production activities.

    Science.gov (United States)

    Culp, T; Potter, C A

    2001-08-01

    Not all operational radiation protection situations lend themselves to simple solutions. Often a Radiation Protection Program must be developed and implemented for difficult situations. A defense in depth approach to radiation protection was developed for 125I production activities. Defense in depth relies on key radiation protection elements that tend to be mutually supportive and in combination provide reasonable assurance that the overall desired level of protection has been provided. For difficult situations, defense in depth can provide both a reasonable and appropriate approach to radiation protection.

  9. Ocular penetration of (/sup 125/I)IVDU, a radiolabeled analogue of bromovinyldeoxyuridine

    Energy Technology Data Exchange (ETDEWEB)

    Maudgal, P.C.; Verbruggen, A.M.; De Clercq, E.; Busson, R.; Bernaerts, R.; de Roo, M.; Ameye, C.; Missotten, L.

    1985-01-01

    Following topical application of (/sup 125/)IVDU, the radiolabeled analogue of bromovinyldeoxyuridine ((E)-5-(2-bromovinyl)-2'-deoxyuridine), as 0.5% or 0.3% eyedrops, to rabbits, (/sup 125/I)IVDU appeared in the anterior chamber fluid at drug levels well above the minimum concentration (0.01 microgram/mL) required for inhibition of herpes simplex virus type 1 replication. These findings are consistent with the efficacy of 0.5% bromovinyldeoxyuridine eyedrops in the topical treatment of herpes simplex uveitis.

  10. Synthesis and biological evaluation of 125I-erythropoietin as a potential radiopharmaceutical agent for tumours

    Directory of Open Access Journals (Sweden)

    Gonçalo dos Santos Clemente

    2011-03-01

    Full Text Available Erythropoietin (EPO is a glycoprotein hormone responsible for regulating erythropoiesis. Expression of EPO and EPO receptors (EPOr has recently been demonstrated in some neoplastic cell lines and tumours, suggesting a potential new target for therapy. In this work, EPO was labeled with iodine-125 using the lactoperoxidase method, known to prevent damage to protein during radioiodination, and labeling conditions were optimized. In vitro stability studies have shown that 125I-EPO is radiochemically stable for 20 days after radiolabeling. In vitro cell binding studies have demonstrated very low binding (A eritropoetina (EPO é um hormônio glicoprotéico responsável pela regulação da eritropoese. Recentemente foi demonstrado que os receptores de EPO (EPOr estão expressos em algumas linhas celulares neoplásicas, o que sugere a sua potencialidade como um novo alvo terapêutico. Neste trabalho a EPO foi radiomarcada com iodo-125 através do método da lactoperoxidase, menos agressivo para a viabilidade biológica das proteínas. A 125I-EPO revelou ser radioquimicamente estável durante 20 dias após a síntese. Um estudo biológico in vitro em linhas celulares tumorais demonstrou que a 125I-EPO apresenta uma ligação muito fraca (<2%, tanto em células normais como nas linhagens tumorais testadas. A biodistribuição em camundongos saudáveis apresentou taxas de fixação relativamente maiores nos órgãos excretores e a tireóide revelou ser o órgão crítico, o que pode indicar a dissociação in vivo da 125I-EPO. No estudo em camundongos com melanoma induzido a fixação no tumor foi residual. Serão, no entanto, necessários novos estudos em outras linhagens tumorais para entender o seu processo de internalização e ligação nas células. Estudos da EPO radiomarcada com carbono-11 poderão também revelar-se interessantes, já que neste método há maior probabilidade da atividade biológica ser preservada.

  11. First permanent human implant of the Stimulus Router System, a novel neuroprosthesis: preliminary testing of a polarity reversing stimulation technique.

    Science.gov (United States)

    Gan, Liu Shi; Ravid, Einat N; Kowalczewski, Jan; Gauthier, Michel; Olson, Jaret; Morhart, Michael; Prochazka, Arthur

    2011-01-01

    Neuroprostheses (NPs) are electrical stimulators that help to restore sensory or motor functions lost as a result of neural damage. The Stimulus Router System (SRS) is a new type of NP developed in our laboratory. The system uses fully implanted, passive leads to "capture" and "route" some of the current flowing between pairs of surface electrodes to the vicinity of the target nerves, hence eliminating the need for an implanted stimulator. In June 2008, 3 SRS leads were implanted in a tetraplegic man for restoration of grasp and release. To reduce the size of the external wristlet and thereby optimize usability, we recently implemented a polarity reversing stimulation technique that allowed us to eliminate a reference electrode. Selective activation of three target muscles was achieved by switching the polarities of the stimulus current delivered between pairs of surface electrodes located over the pick-up terminals of the implanted leads and reducing the amplitude of the secondary phases of the stimulus pulses.

  12. Comparison of implant quality between intraoperatively built custom-linked seeds and loose seeds in permanent prostate brachytherapy using sector analysis.

    Science.gov (United States)

    Katayama, Norihisa; Takemoto, Mitsuhiro; Takamoto, Atsushi; Ihara, Hiroki; Katsui, Kuniaki; Ebara, Shin; Nasu, Yasutomo; Kanazawa, Susumu

    2016-07-01

    We compared the implant quality of intraoperatively built custom-linked (IBCL) seeds with loose seeds in permanent prostate brachytherapy. Between June 2012 and January 2015, 64 consecutive prostate cancer patients underwent brachytherapy with IBCL seeds (n = 32) or loose seeds (n = 32). All the patients were treated with 144 Gy of brachytherapy alone. Brachytherapy was performed using a dynamic dose calculation technique. Computed tomography/magnetic resonance imaging fusion-based dosimetry was performed 1 month after brachytherapy. Post-implant dose-volume histogram (DVH) parameters, prostate sector dosimetry, operation time, seed migration, and toxicities were compared between the IBCL seed group and the loose seed group. A sector analysis tool was used to divide the prostate into six sectors (anterior and posterior sectors at the base, mid-gland, and apex). V100 (95.3% vs 89.7%; P = 0.014) and D90 (169.7 Gy vs 152.6 Gy; P = 0.013) in the anterior base sector were significantly higher in the IBCL seed group than in the loose seed group. The seed migration rate was significantly lower in the IBCL seed group than in the loose seed group (6% vs 66%; P seed was significantly longer in the IBCL seed group than in the loose seed group (1.31 min vs 1.13 min; P = 0.003). Other post-implant DVH parameters and toxicities did not differ significantly between the two groups. Our study showed more dose coverage post-operatively in the anterior base prostate sector and less seed migration in IBCL seed implantation compared with loose seed implantation.

  13. Autoradiographic distribution of /sup 125/I-galanin binding sites in the rat central nervous system

    Energy Technology Data Exchange (ETDEWEB)

    Skofitsch, G.; Sills, M.A.; Jacobowitz, D.M.

    1986-11-01

    Galanin (GAL) binding sites in coronal sections of the rat brain were demonstrated using autoradiographic methods. Scatchard analysis of /sup 125/I-GAL binding to slide-mounted tissue sections revealed saturable binding to a single class of receptors with a Kd of approximately 0.2 nM. /sup 125/I-GAL binding sites were demonstrated throughout the rat central nervous system. Dense binding was observed in the following areas: prefrontal cortex, the anterior nuclei of the olfactory bulb, several nuclei of the amygdaloid complex, the dorsal septal area, dorsal bed nucleus of the stria terminalis, the ventral pallidum, the internal medullary laminae of the thalamus, medial pretectal nucleus, nucleus of the medial optic tract, borderline area of the caudal spinal trigeminal nucleus adjacent to the spinal trigeminal tract, the substantia gelatinosa and the superficial layers of the dorsal spinal cord. Moderate binding was observed in the piriform, periamygdaloid, entorhinal, insular cortex and the subiculum, the nucleus accumbens, medial forebrain bundle, anterior hypothalamic, ventromedial, dorsal premamillary, lateral and periventricular thalamic nuclei, the subzona incerta, Forel's field H1 and H2, periventricular gray matter, medial and superficial gray strata of the superior colliculus, dorsal parts of the central gray, peripeduncular area, the interpeduncular nucleus, substantia nigra zona compacta, ventral tegmental area, the dorsal and ventral parabrachial and parvocellular reticular nuclei. The preponderance of GAL-binding in somatosensory as well as in limbic areas suggests a possible involvement of GAL in a variety of brain functions.

  14. Application of different /sup 125/I tracers in radioimmunoassays of estradiol-17. beta

    Energy Technology Data Exchange (ETDEWEB)

    Bienert, R.; Flentje, H.; Herzmann, H. (Akademie der Wissenschaften der DDR, Berlin-Buch. Zentralinstitut fuer Isotopen- und Strahlenforschung; Akademie der Wissenschaften der DDR, Leipzig. Zentralinstitut fuer Isotopen- und Strahlenforschung)

    1984-01-01

    Some different /sup 125/I-labelled estradiol tracers were produced by direct radioiodizing of estradiol and also of the histamine and tyramine conjugates of estradiol-3-carboxymethylether (E/sub 2/-3-CM) by means of the chloramine-T method. The linkage properties of these tracers were investigated in relation to the /sup 3/H-labelled estradiol opposite to the antisera, which were produced against the cow serum albumin (RSA) conjugates of E/sub 2/-3-CM and estradiol-6-carboxymethyloxime (E/sub 2/-6-CMO). As suitable system for the radioimmunological estradiol determination could be revealed 4-/sup 125/I-iodine estradiol in connection with one antiserum in each case of the radioligand antiserum combinations against E/sub 2/-3-CM-RSA- and E/sub 2/-6-CMO-RSA-conjugate. The double antibody method is used for separation in optimized RIA systems. The first and the second antibody reaction take place simultaneously.

  15. On-line I-/Te- separation for the AMS analysis of 125I

    Science.gov (United States)

    Charles, C. R. J.; Cornett, R. J.; Zhao, X.-L.; Litherland, A. E.; Kieser, W. E.

    2015-10-01

    The isobar separator for anions (ISA) was used together with a 3 MV tandem accelerator mass spectrometer (AMS) to demonstrate the real time (on-line) separation of Te- from I-. Following the ion source mass spectrometry and major retardation to tens of eV, the ISA uses a radiofrequency quadrupole (RFQ) ion guide to confine and direct I- and associated Te- isobar anions through a gas-reaction cell, where chemical reactions occur at eV energies with the electronegative gas NO2. Anions are subsequently reaccelerated out of the ISA to near original ion source extraction energies for AMS analysis. At 5 mTorr NO2 in the ISA gas-reaction cell, 125Te- was observed to be attenuated by a factor of ∼107 as compared to 127I- that did not experience significant (107 relative to 37Cl- under the same ISA-AMS conditions. The preferential destruction of Te- (and S-) at eV energies in the ISA is likely due to a larger favorable destruction cross-section with NO2. This study is the first demonstration of I-Te anion separation for AMS, and makes possible the use of 125I, free of the contaminant 125Te isobar after suitable sample purification, for future 129I/125I carrier-free analyses of natural samples at ultra-low trace levels.

  16. Relationship between alveolar bone measured by /sup 125/I absorptiometry with analysis of standardized radiographs: 1. Magiscan

    Energy Technology Data Exchange (ETDEWEB)

    Hausmann, E.; Ortman, L.F.; McHenry, K.; Fallon, J.

    1982-05-01

    Previous studies have shown that /sup 125/I absorptiometry gives an accurate and sensitive measure of alveolar bone mass. The purpose of this study was to determine the relationship between alveolar bone mass determined by /sup 125/I absorptiometry and bone density obtained by analysis of standardized intraoral radiographs by the Magiscan System. A defect of increasing size was made at one site of the alveolar bone in a human skull. The amount of bone remaining at each step was calculated using /sup 125/I absorptiometry. Standardized radiographs were also taken at each step and the relative density in the area of the defect was determined by the Magiscan System. The Magiscan's System Computer Memory permits analysis of identical areas on a longitudinal series of films of the same alveolar bone location. The results indicate that in estimating amounts of alveolar bone the Magiscan analysis of standardized intraoral radiography is similar in sensitivity and accuracy to /sup 125/I absorptiometry.

  17. Inhibition of human prostate cancer xenograft growth by 125I labeled triple-helin forming oligonucleotide directed against androgen receptor

    Institute of Scientific and Technical Information of China (English)

    ZHANG Yong; MA Yi; LU Han-ping; GAO Jin-hui; LIANG Chang-sheng; LIU Chang-zheng; ZOU Jun-tao; WANG Hua-qiao

    2008-01-01

    Background The failure of hormone treatment for advanced prostate cancer might be related to aberrant activation of the androgen receptor.We have shown that 125I labeled triple-helix forming oligonucleotide (TFO) against the androgen receptor gene inhibits androgen receptor expression and cell proliferation of LNCaP prostate cancer cells in vitro.This study aimed at exploring the effects of the 125I-TFO on prostate tumor growth in vivo using a nude mouse xenograft model.Methods TFO was labeled with 125I by the iodogen method.Thirty-two nude mice bearing LNCaP xenograft tumors were randomized into 4 groups and were intratumorally injected with 125I-TFO,unlabeled TFO,Na125I and normal saline.Tumor size was measured weekly.The tumor growth inhibition rate (RI) was calculated by measurement of tumor weight.The expression of the androgen receptor gene was performed by RT-PCR and immunohistochemical study.The prostate specific antigen (PSA) serum levels were measured by enzyme linked immunosorbent assay.The tumor cell apoptosis index (Al) was detected by TUNEL assay.Results Tumor measurements showed that tumor development was significantly inhibited by either 125I-TFO or TFO,with tumor RIs of 50.79% and 32.80% respectively.125I-TFO caused greater inhibition of androgen receptor expression and higher Als in tumor tissue than TFO.Both the tumor weight and the PSA serum levels in 125I-TFO treated mice ((0.93±0.15) g and (17.43±1.85) ng/ml,respectively) were significantly lower than those ((1.27±0.21) g and (28.25±3.41)ng/ml,respectively) in TFO treated mice (all P<0.05).Na125I did not significantly affect tumor growth and androgen receptor expression in tumor tissue.Conclusions The 125I-TFO can effectively inhibit androgen receptor expression and tumor growth of human prostate cancer xenografts in vivo.The inhibitory efficacy of 125I-TFO is more potent than that of TFO,providing a reference for future studies of antigen radiotherapy.

  18. Development of virtual patient models for permanent implant brachytherapy Monte Carlo dose calculations: interdependence of CT image artifact mitigation and tissue assignment

    Science.gov (United States)

    Miksys, N.; Xu, C.; Beaulieu, L.; Thomson, R. M.

    2015-08-01

    This work investigates and compares CT image metallic artifact reduction (MAR) methods and tissue assignment schemes (TAS) for the development of virtual patient models for permanent implant brachytherapy Monte Carlo (MC) dose calculations. Four MAR techniques are investigated to mitigate seed artifacts from post-implant CT images of a homogeneous phantom and eight prostate patients: a raw sinogram approach using the original CT scanner data and three methods (simple threshold replacement (STR), 3D median filter, and virtual sinogram) requiring only the reconstructed CT image. Virtual patient models are developed using six TAS ranging from the AAPM-ESTRO-ABG TG-186 basic approach of assigning uniform density tissues (resulting in a model not dependent on MAR) to more complex models assigning prostate, calcification, and mixtures of prostate and calcification using CT-derived densities. The EGSnrc user-code BrachyDose is employed to calculate dose distributions. All four MAR methods eliminate bright seed spot artifacts, and the image-based methods provide comparable mitigation of artifacts compared with the raw sinogram approach. However, each MAR technique has limitations: STR is unable to mitigate low CT number artifacts, the median filter blurs the image which challenges the preservation of tissue heterogeneities, and both sinogram approaches introduce new streaks. Large local dose differences are generally due to differences in voxel tissue-type rather than mass density. The largest differences in target dose metrics (D90, V100, V150), over 50% lower compared to the other models, are when uncorrected CT images are used with TAS that consider calcifications. Metrics found using models which include calcifications are generally a few percent lower than prostate-only models. Generally, metrics from any MAR method and any TAS which considers calcifications agree within 6%. Overall, the studied MAR methods and TAS show promise for further retrospective MC dose

  19. Identification of 2-[125I]iodomelatonin binding sites in the thymus of mice and its significance

    Institute of Scientific and Technical Information of China (English)

    刘志民; 赵瑛; 彭树勋

    1995-01-01

    The melatonin binding sites in membrane preparations of the mouse thymus were demonstratedusing 2-[125I] iodomelatonin as a radioligand.The binding sites were stable,saturable,reversible and of highaffinity.Studies on specificity of 2-[125I] iodomelatonin binding suggested that the 2-[125I] iodomelatonin bindingsites are highly specific for melatonin.These binding sites fulfilled the standard criteria for receptors.Ourwork suggested that melatonin should have direct regulatory action on immune system mediated through themelatonin binding sites.Studies on the circadian rhythm showed that there existed the circadian rhythm in the bind-ing capacity for 2-[125I] iodomelatonin in the mouse thymus with the peak values at 12:00-16:00 andthe trough values between 00:00 and 4:00.The subceUular distribution of 2-[125I] iodomelatonin binding sitesin the mouse thymus was in the following descending order:nuclear>mitochondrial>microsomal>cytosolic frac-tion.There was also an age-related decrease in 2-[125I] iodomelatonin binding in the mouse thymus.This iscorrelated with the involution of the thymus.

  20. Experimental determination of dosimetry parameters for Sinko 125I seed source using thermoluminescent dosimeter%热释光剂量仪测量体模植入125I粒子源的剂量学参数可行性

    Institute of Scientific and Technical Information of China (English)

    张梦龙; 宋善军; 王卫鹏; 赵斌

    2014-01-01

    Objective To study the dosimetry parameters of 125I seed source (type Sinko BT-125-1) with thermoluminescent dosimeter (TLD) in the phantom.Methods The new type of phantom was modified to suit to measurement of a common type of 125I seed source.The AAPM TG43 protocol recommended measurements of dose-rate constant (Λ),radial dose function (gL (r)),and anisotropy function (F (r,θ)) have been performed in the phantom with TLD.Results The Λ was 0.928 cGyh-1 U-1.The gL(r) was determined at different radial distances r ranging from 1.0 to 10.0 cm with an interval of 1.0 cm ; and F (r,θ) at angles from 0° to 90° in 10° increments.The gL (r) of 125I seed source showed a difference of 9.6% at the most in comparison to the corresponding values of 125I seed source (type Amersham 6711).The difference in F(2 cm,θ) of 125I seed source and Amersham 6711 was up to 10.2% near the source end.With the phantom the combined standard uncertainty in the whole measurement was less than 6.0%.Conclusions The experimental results exhibit fairly small measurement uncertainties and good self-consistency.It's feasible to measure the dosimetry characters of permanent implant seeds in the modified phantom.%目的 探讨应用热释光剂量仪在体模中测量植入125I粒子源(型号Sinko BT-125-1)的剂量学参数可行性.方法 将测量体模进行改进使其可适用于剂量学测量.根据AAPM TG43建议测量的参数包括剂量率常数Λ、径向剂量函数gL(r)和各向异性函数F(r,θ)等,所测数据与文献中其他构造相似的125I粒子源数据进行比较.结果 125I粒子源的Λ为0.928 cGyh-1 U-1.所测得的gL(r)范围为径向距离在1.0~10.0cm内所对应的值.F(r,θ)范围为角度在0.~90.内所对应的值.与型号Amersham 6711 125I粒子源相比,二者gL(r)值的最大差异为9.6%.二者F(r=2 cm,θ=0)值的差异为10.2%.应用此体模进行测量总的不确定度<6.0%.结论 测量结果具备较小的不确定性和良好

  1. Comparison of /sup 125/I-fibrinogen kinetics and fibrinopeptide A in patients with disseminated neoplasias

    Energy Technology Data Exchange (ETDEWEB)

    Mombelli, G.; Roux, A.; Haeberli, A.; Straub, P.W.

    1982-08-01

    To provide more information on the pathways of fibrinogen catabolism in generalized cancer, the effect of heparin on fibrinopeptide A (fpA) and on /sup 125/I-fibrinogen kinetics was studied in 15 patients with disseminated neoplasia. Three patients had evidence of venous thrombosis and in 2 additional patients a low fibrinogen level together with increased amounts of FDP/fdp and a positive ethanol test indicated disseminated intravascular coagulation (DIC). The plasma levels of fpA were grossly elevated (4.6--20, mean 11.4 ng/ml, normal values 1.01 +/- 0.45 ng/ml) in patients with thrombosis or DIC, and normal to grossly elevated (0.4--10.4, mean 6.1 ng/ml) in the other patients. Intravenous heparin bolus lowered the fpA level in 11/11 patients, and continuous heparin treatment led to an impressive suppression or complete normalization of the plasma fpA in 5/6 patients. This finding is thought to reflect heparin suppression of thrombin activity on fibrinogen. In some cases, the fpA fall after heparin bolus was slow and/or incomplete, suggesting fpA generation at sites not easily accessible to heparin or insufficient heparin dosage. The /sup 125/I-fibrinogen kinetics were characterized by a significantly shorter half-life (t1/2: 2.5 days), increased catabolic rate constant (j: 0.44 days-1), and increased absolute turnover (68.9 mg fibrinogen/kg/day) as compared to 4 normal subjects (t1/2: 4.2 days; j: 0.26 days-1; turnover 21.7 mg fibrinogen/kg/day). As estimated from the fpA generation rates, intravascular thrombin action on fibrinogen contributed only in minor part to increase the turnover of /sup 125/I-fibrinogen. In particular, the turnover was greatly accelerated in heparin-treated patients despite impressive suppression or normalization of the fpA levels in 5/6 cases.

  2. Preparation of {sup 125}I-iodotyraminehemisuccinyltaxol ({sup 125}ITHT) for competitive taxol radioimmunoassay

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Tae Sup; Awh, Ok Doo; Choi, Tae Hyun; Kim, Hyun Suk; Hong, Jun Pyo; Lee, Eun Sook [College of Medicine, Yonsei Univ., Wonju (Korea, Republic of); Choi, Chang Woon; Lim, Sang Moo [Korea Cancer Center Hospital, Seoul (Korea, Republic of)

    2002-04-01

    Taxol(Paclitaxel), an antineoplastic agent, has been used in the treatment of ovarian and breast cancers. The determination of optimal Taxol concentrations in human serum was required for enhancing therapeutic effect and maintaining the appropriate Taxol level in blood. This study was aimed to synthesize radiolabeled Taxol derivatives as radiotracer in competitive radioimmuoassay for monitoring Taxol concentrations in blood and to determine the usefulness of its derivatives. Hemisuccinyltaxol(HT) was synthesized by esterification of Taxol with succinic anhydride. Tyraminehemisuccinyltaxol (THT) was synthesized by coupling of HT with tyramine using isobutylchloroformate as coupling agent and purified by HPLC. By using chloramine-T(5.25 mg/ml, 10 {mu}l) as oxidant agent, THT (4 mg/ml, 30 {mu}l) was labeled with {sup 125}I (37 MBq, 1 mCi). To estimate the stability of purified THT, {sup 125}I-iodotyraminehemisuccinyltaxol ({sup 125}ITHT) was dissolved in 80% acetonitrile aqueous solution, and the solution was incubated at 4 .deg. C and 37 .deg. C for 7 days. At various time intervals, the stability of THT and {sup 125}ITHT was monitored. The titer of Taxol monoclonal antibody, 3G5A7, was determined by competitive radioimmunoassay using {sup 125}ITHT as a labeled antigen. A standard dose-response curve was demonstrated by Taxol competitive radioimmunoassay. HT and THT were synthesized with 79.9% and 19.5% yield, respectively. The labeling yield of {sup 125}ITHT was 93%. After 7 days, the chemical purity of THT was 96.5% at 4 .deg. C, and 97.5% at 37 .deg. C. After 3 days, {sup 125}ITHT was stable with 94.7% at 4 .deg. C and 93.4% at 37 .deg. C. After 7 days radiochemical purity was diminished to 88.1% at 4 .deg. C and 86.1% at 37 .deg. C. The titer of Taxol monoclonal antibody, 3G5A7, was determined to 1:256. A standard dose-response cure demonstrated good collinearity (R{sup 2}=0.971) as Taxol concentration-dependent manner. Competitive radioimmunoassay using {sup 125

  3. Permanent and transient effects of locally delivered n-acetyl cysteine in a guinea pig model of cochlear implantation.

    Science.gov (United States)

    Eastwood, Hayden; Pinder, Darren; James, David; Chang, Andrew; Galloway, Stuart; Richardson, Rachael; O'Leary, Stephen

    2010-01-01

    Protection of residual hearing after cochlear implant surgery can improve the speech and music perception of cochlear implant recipients, particularly in the presence of background noise. Surgical trauma and chronic inflammation are thought to be responsible for a significant proportion of residual hearing loss after surgery. Local delivery of the anti-oxidant precursor n-acetyl cysteine (NAC) to the cochlea via round window 30min prior to surgery, increased the level of residual hearing at 24-32kHz 4weeks post surgery compared to controls. The hearing protection was found in the basal turn near the site of implantation. Coincidentally, the basal turn was also the location that sustained the greatest hearing loss. As well as protecting residual hearing, NAC-treated animals demonstrated a reduction in the chronic inflammatory changes associated with implantation. While these findings indicate that anti-oxidant therapy can be used to reduce the hearing loss associated with surgical trauma, the local delivery of NAC was associated with a transient increase in hearing thresholds, and osseoneogenesis was seen in a greater number of NAC-treated animals. These side-effects would limit its clinical use through local cochlear administration. However, it is not known yet whether these effects would also be produced by other anti-oxidants, or ameliorated by using a different route of administration.

  4. 99mTc-albumin can replace 125I-albumin to determine plasma volume repeatedly

    DEFF Research Database (Denmark)

    Bonfils, Peter K; Damgaard, Morten; Stokholm, Knud H;

    2012-01-01

    OBJECTIVE: Plasma volume assessment may be of importance in several disorders. The purpose of the present study was to compare the reliability of plasma volume measurements by technetium-labeled human serum albumin ((99m)Tc-HSA) with a simultaneously performed plasma volume determination with iod......OBJECTIVE: Plasma volume assessment may be of importance in several disorders. The purpose of the present study was to compare the reliability of plasma volume measurements by technetium-labeled human serum albumin ((99m)Tc-HSA) with a simultaneously performed plasma volume determination...... for accurate retropolation from the plasma counts to time zero to correct for leakage of the isotopes from the circulation. RESULTS: The mean difference (bias) between plasma volume measured with (125)I-albumin and (99m)Tc-albumin was 8 ml (0.1 ml/kg) with limits of agreement (bias ±1.96 SD) ranging from -181...

  5. Search for a 17 keV neutrino in the internal bremsstrahlung spectrum of 125I

    Science.gov (United States)

    Hindi, M. M.; Kozub, R. L.; Robinson, S. J.

    1994-06-01

    We have searched for evidence of the emission of a 17 keV neutrino in the internal bremsstrahlung (IB) spectrum accompanying the electron capture decay of 125I. The IB spectrum, recorded in a planar Ge detector, has 1.2×106 counts per keV at 17 keV below the 2p end point. We set an upper limit of 0.4% for the admixture of a 17 keV neutrino, at the 90% confidence level, and exclude a 0.8% admixture at the 99.6% confidence level. The QEC value is found to be 185.77+/-0.06 keV. We also find that the recent calculations of Surić et al., which employ relativistic self-consistent-field atomic wave functions, reproduce the shape and relative intensity of IB partial spectra within a few percent.

  6. Synthesis and tissue distribution of substituted [{sup 125}I]iodophenylamine derivatives: Possible brain imaging agents

    Energy Technology Data Exchange (ETDEWEB)

    Ghaffari, M.A.; Ali, H.; Rousseau, J.; Lier, J.E. van

    1997-02-01

    The synthesis and brain uptake in mice of the radioidinated derivatives of N,N-dimethyl-N'-(idodimethoxyphenyl)-1,3-propanediamine, as well as the N-substituted derivatives of (iodoalkylphenyl)isopropyl, iodoalkylphenylethylamine and 3,4-(methylenedioxy)phenyl-amphetamine (MDA) are described. These compounds contain structural features of both IMP and HIPDM, the cerebral perfusion agents currently in clinical use. The radiolabeled analogs were obtained via the [{sup 125}I]I exchange method, or by [{sup 125}I]NaI treatment of the iodo-free precursor in the presence of an oxidant. Following intravenous injection in mice, all compounds showed important radioactivity concentrations in the lungs and kidneys. The N-substituted (iodoalkylphenyl)isopropyl and iodoalkylphenyl-ethylamine derivatives displayed a high initial brain uptake (>10%IDg{sup -1}) followed by a rapid clearance phase, resulting in lower brain-to-blood ratios as those reported for IMP and HIPDM. In contrast, N,N-dimethyl-N'-(iododimethoxyphenyl)-1,3-propanediamine derivatives featuring the iodo substituent on the benzene carbon adjacent to the methyl amine group and the methoxy substituents on the 2,5- or 2,4-positions, showed low but more persistant brain uptake. Combined with fast blood clearance, this resulted in high brain-to-blood ratios at later time points. Among all compounds tested, the highest brain-to-blood ratio was observed with compound N,N-dimethyl-N'-(6-iodo-3,4-dimethoxyphenyl)-1,3-propanediamine (27e), reaching a maximum of >20 at 12 h post-injection.

  7. /sup 125/I-human epidermal growth factor specific binding to placentas and fetal membranes from varoius pregnancy states

    Energy Technology Data Exchange (ETDEWEB)

    Hofmann, G.E.; Siddiqi, T.A.; Rao, Ch. V.; Carman, F.R.

    1988-01-01

    Specific binding of /sup 125/I-human epidermal growth factor (hEGF) to homogenates of term human placentas and fetal membranes from normal and appropriate for gestational age (N = 20), intrauterine growth retarded (N = 9), twin (N = 11), White class AB diabetic (N = 12), and large for gestational age (N = 13) pregnancies was measured. In all pregnancy states, placentas bound approximately four times more /sup 125/I-hEGF than did fetal membranes (P<0.0001). There was no significant differnce in /sup 125/I-hEGF binding to fetal membranes from the various pregnancy states (P<0.05). /sup 125/I-hEGF specific binding to placentas from intrauterine growth retarded or twin pregnancies was significantly greater compared with placentas from normal and appropriate for gestational age pregnancies (P<0.05). The binding to placentas from pregnancies complicated by White class AB diabetes or large for gestational age infants, on the other hand, was not significantly different from that to placentas from normal and appropriate for gestational age pregnancies. /sup 125/I-hEGF specific binding did not differ between placentas from intrauterine growth retarded or twin pregnancies (P<0.05). Placental and fetal membrane /sup 125/I-hEGF binding did not vary with fetal sex, maternal race, placental weight, or gestational age between 37 to 42 weeks (P<0.05). Placental but not fetal membrane /sup 125/I-hEGF binding increased with increasing infant weight when appropriate for gestational age and large for gestational age infants were included (P<0.05, r = 0.38, N = 32) but not for intrauterine growth retarded, appropriate for gestational age, or large for gestational age infants alone.

  8. Benzodiazepine effect of {sup 125}I-iomazenil-benzodiazepine receptor binding and serum corticosterone level in a rat model

    Energy Technology Data Exchange (ETDEWEB)

    Fukumitsu, Nobuyoshi [Proton Medical Research Center, University of Tsukuba, Ibaragi, 305-8575 (Japan)]. E-mail: gzl13162@nifty.ne.jp; Ogi, Shigeyuki [Department of Radiology, Jikei University School of Medicine, Tokyo, 105-8461 (Japan); Uchiyama, Mayuki [Department of Radiology, Jikei University School of Medicine, Tokyo, 105-8461 (Japan); Mori, Yutaka [Department of Radiology, Jikei University School of Medicine, Tokyo, 105-8461 (Japan)

    2005-01-01

    To test the change in free or unoccupied benzodiazepine receptor (BZR) density in response to diazepam, we investigated {sup 125}I-iomazenil ({sup 125}I-IMZ) binding and serum corticosterone levels in a rat model. Wistar male rats, which received psychological stress using a communication box for 5 days, were divided into two groups according to the amount of administered diazepam: no diazepam [D (0)] group and 10 mg/kg per day [D (10)] group of 12 rats each. The standardized uptake value (SUV) of {sup 125}I-IMZ of the D (10) group were significantly lower (P<.05) than those of the D (0) group in the frontal, parietal and temporal cortices, globus pallidus, hippocampus, amygdala and hypothalamus. The serum corticosterone level ratio in the D (10) group was significantly lower than that in the D (0) group (P<.05). From the change in serum corticosterone levels, diazepam attenuated the psychological stress produced by the physical stress to animals in adjacent compartments. From the reduced binding of {sup 125}I-IMZ, it is clear that diazepam competed with endogenous ligand for the free BZR sites, and the frontal, parietal and temporal cortices, globus pallidus, hippocampus, amygdala and hypothalamus are important areas in which {sup 125}I-IMZ binding is strongly affected by administration of diazepam.

  9. {sup 125}I-iomazenil - benzodiazepine receptor binding and serum corticosterone level during psychological stress in a rat model

    Energy Technology Data Exchange (ETDEWEB)

    Fukumitsu, Nobuyoshi E-mail: GZL13162@nifty.ne.jp; Ogi, Shigeyuki; Uchiyama, Mayuki; Mori, Yutaka

    2004-02-01

    To test the hypothesis that benzodiazepine receptor density decreases in response to stress, we correlated {sup 125}I-iomazenil ({sup 125}I-IMZ) binding with serum corticosterone levels in a rat model. Wistar male rats were divided into four groups; control group (CON, 10 rats), no physical or psychological stress; and one-, three-, and five-day stress groups of 12 rats each (1-DAY, 3-DAY, and 5-DAY, respectively), receiving psychological stress for the given number of days. Psychological stress were given to rats with a communication box. The standardized uptake value (SUV) of {sup 125}I-iomazenil of the 3-DAY and 5-DAY showed that {sup 125}I-iomazenil - benzodiazepine receptor binding was significantly reduced in the cortices, accumbens nuclei, amygdala and caudate putamen (p<0.05). Serum corticosterone level ratio appeared to be slightly elevated in 3-DAY and 5-DAY, although this elevation was not significant. These data suggest that {sup 125}I-IMZ is a useful radioligand to reflect received stress and its binding in the cortices, accumbens nuclei, amygdala and caudate putamen is strongly affected by psychological stress.

  10. Separation of {sup 134}Cs and {sup 137}Cs from {sup 125}I solution for medical applications

    Energy Technology Data Exchange (ETDEWEB)

    Ram, Ramu; Dash, Ashutosh [Bhabha Atomic Research Centre, Trombay, Mumbai (India). Isotope Production and Applications Div.; Banerjee, Dayamoy [Bhabha Atomic Research Centre, Trombay, Mumbai (India). Process Development Div.

    2015-06-01

    While neutron irradiation of natural Xe gas followed by wet chemical dissolution of activation products constitutes a successful paradigm for the small scale production {sup 125}I, the concomitant production of {sup 134}Cs and {sup 137}Cs emerged as the primary impediment which necessitates purification of {sup 125}I solution. This paper describes an ion-exchange chromatographic technique using Resorcinol Formaldehyde (RF) resin to purify {sup 125}I solution from {sup 134}Cs and {sup 137}Cs impurities. A thorough investigation of the adsorption parameters of RF resin was carried out to arrive at the experimental conditions resulting optimum retention of {sup 134}Cs and {sup 137}Cs impurities. Based on the experimental findings, an optimized separation procedure was developed in which the neutron irradiated dissolved products at pH ∝ 13 was passed through a chromatography column containing RF resin where in {sup 134}Cs and {sup 137}Cs impurities gets adsorbed leaving behind {sup 125}I to appear in the effluent. The overall recovery of {sup 125}I was >90% with acceptable purity amenable for clinical applications.

  11. Synthesis and biodistribution of (/sup 125/I)iodo- and (/sup 75/Se)seleno-ergoline derivatives

    Energy Technology Data Exchange (ETDEWEB)

    Sadek, S.; Basmadjian, G.; Patel, A.

    1987-01-01

    ((/sup 125/)Iodomethyl)-6-propylergoline (/sup 125/I-3) was prepared by refluxing the mesyl analog with Na/sup 125/I in methyl-ethyl-ketone, followed by HPLC, in a radiochemical yield greater than 70%. (/sup 75/Se)Selenopergolide (/sup 75/Se-2) was prepared in 74% yield starting with H/sub 2//sup 75/ SeO/sub 3/. The biodistribution studies of the two compounds in male rats show good uptake by the adrenals and the brain. Compound /sup 75/Se-2 had higher adrenal uptake and adrenal-to-blood ratios (4.2% dose/g and 70:1) than /sup 125/I-3 (3.6% dose/g and 23.8:1) at 15 min post injection. The two compounds had almost equal brain uptake (0.91% dose/g for /sup 75/Se-2 and 1.14% dose/g for /sup 125/I-3), but /sup 75/Se-2 showed higher brain-to-blood ratios (15.2:1 vs 7.3:1) at 15 min post injection. This study indicates that /sup 75/Se-2 and /sup 125/I-3 may be useful agents for imaging the adrenal and the brain.

  12. Optimal implantation depth and adherence to guidelines on permanent pacing to improve the results of transcatheter aortic valve replacement with the medtronic corevalve system: The CoreValve prospective, international, post-market ADVANCE-II study

    NARCIS (Netherlands)

    A.S. Petronio (Anna S.); J.-M. Sinning (Jan-Malte); N.M. van Mieghem (Nicolas); G. Zucchelli (Giulio); G. Nickenig (Georg); R. Bekeredjian (Raffi); B. Bosmans; F. Bedogni (Francesco); M. Branny (Marian); K. Stangl (Karl); J. Kovac (Jan); M. Schiltgen (Molly); S. Kraus (Stacia); P.P.T. de Jaegere (Peter)

    2015-01-01

    textabstractObjectives The aim of the CoreValve prospective, international, post-market ADVANCE-II study was to define the rates of conduction disturbances and permanent pacemaker implantation (PPI) after transcatheter aortic valve replacement with the Medtronic CoreValve System (Minneapolis, Minnes

  13. Evaluation of [{sup 125}I]7{alpha}-O-iodoally diprenophine as a new potential SPECT opioid receptor imaging agent

    Energy Technology Data Exchange (ETDEWEB)

    Wang, R.F.; Tafani, J.A.M.; Frances, B.; Bergon, M.; Coulais, Y.; Zajac, J. M.; Guiraud, R

    1997-08-01

    A new iodinated diprenorphine analog, [{sup 125}I]7{alpha}-O-iodoallyl diprenorphine ([{sup 125}I]7{alpha}-O-IA-DPN), was prepared by iododestannylation and characterized. As an opioid antagonist, this agent showed very high affinity (K{sub i} = 0.4 {+-} 0.2 nM) and 63% of specific binding by in vitro and in vivo binding studies. Inhibition curves indicated that this tracer labeled with the same affinities to three opioid receptors ({mu} = {delta} = {kappa}). The findings demonstrate that this proposed compound appears to be a potential radioprobe for future study of opioid receptors by in vivo SPECT.

  14. Comparison of two procedures for labelling the surface of the hydatid disease organism, Echinococcus granulosus, with /sup 125/I

    Energy Technology Data Exchange (ETDEWEB)

    McManus, D.P.; McLaren, D.J.; Clark, N.W.T.; Parkhouse, R.M.E.

    1987-03-01

    Living, intact protoscoleces of the British horse and sheep strains of Echinococcus granulosus were subjected to surface radioiodination procedures using /sup 125/I and Iodogen and /sup 125/I-Bolton Hunter reagent. Subsequent combined electron microscopy and autoradiography revealed specific surface membrane labelling with the Iodogen procedure, but significant tegumental labelling with the Bolton-Hunter reagent. The two parasite strains yielded different profiles of electrophoretically separated labelled proteins; the Iodogen method, not surprisingly, resulted in a less complex pattern of labelled polypeptides than the Bolton and Hunter reagent.

  15. Subtraction radiography and computer assisted densitometric analyses of standardized radiographs. A comparison study with /sup 125/I absorptiometry

    Energy Technology Data Exchange (ETDEWEB)

    Ortmann, L.F.; Dunford, R.; McHenry, K.; Hausmann, E.

    1985-01-01

    A standardized radiographic series of incrementally increasing alveolar crestal defects in skulls were subjected to analyses by subtraction radiography and computer assisted quantitative densitometric analysis. Subjects were able to detect change using subtraction radiography in alveolar bone defects with bone loss in the range of 1-5 percent as measured by /sup 125/I absorptiometry. Quantitative densitometric analyses utilizing radiographic pairs adjusted for differences in contrast (gamma corrected) can be used to follow longitudinal changes at a particular alveolar bone site. Such measurements correlate with change observed by /sup 125/I absorptiometry (r=0.82-0.94). (author).

  16. Effects of hyperthermia on binding, internalization, and degradation of epidermal growth factor. [/sup 125/I

    Energy Technology Data Exchange (ETDEWEB)

    Magun, B.E.; Fennie, C.W.

    1981-04-01

    /sup 125/I-epidermal growth factor was used as a molecular probe to study the effects of hyperthermia and local anesthetics on cultured Rat-1 cells. Heating cells at 45/sup 0/C for times up to 1 h caused a continuous decrease in EGF binding. Scatchard analysis showed that the decreased binding resulted from a decrease in the affinity of the EGF receptors rather than from a decrease in receptor number. Exposure to 42/sup 0/C had no effect on degradation. We compared the effects of heat to those caused by the local anesthetics procaine the lidocaine, which have been shown to prevent EGF degradation. Because procaine and lidocaine have been shown by others to potentiate the killing effects of hyperthermia on tumors and in cultured cells, we suggest that hyperthermia and the local anesthetics may act at the same cellular site. By inhibiting the action of lysosomes, hyperthermia and local anesthetics may permit potentially toxic materials to enter the cell by endocytosis, where they would accumulate and induce lethal damage.

  17. Differential dose contributions on total dose distribution of (125)I brachytherapy source.

    Science.gov (United States)

    Camgöz, B; Yeğin, G; Kumru, M N

    2010-01-01

    This work provides an improvement of the approach using Monte Carlo simulation for the Amersham Model 6711 (125)I brachytherapy seed source, which is well known by many theoretical and experimental studies. The source which has simple geometry was researched with respect to criteria of AAPM Tg-43 Report. The approach offered by this study involves determination of differential dose contributions that come from virtual partitions of a massive radioactive element of the studied source to a total dose at analytical calculation point. Some brachytherapy seeds contain multi-radioactive elements so the dose at any point is a total of separate doses from each element. It is momentous to know well the angular and radial dose distributions around the source that is located in cancerous tissue for clinical treatments. Interior geometry of a source is effective on dose characteristics of a distribution. Dose information of inner geometrical structure of a brachytherapy source cannot be acquired by experimental methods because of limits of physical material and geometry in the healthy tissue, so Monte Carlo simulation is a required approach of the study. EGSnrc Monte Carlo simulation software was used. In the design of a simulation, the radioactive source was divided into 10 rings, partitioned but not separate from each other. All differential sources were simulated for dose calculation, and the shape of dose distribution was determined comparatively distribution of a single-complete source. In this work anisotropy function was examined also mathematically.

  18. Detection of antibodies to bacterial cell wall peptidoglycan in human sera. [/sup 125/I tracer technique

    Energy Technology Data Exchange (ETDEWEB)

    Heymer, B.; Schleifer, K.H.; Read, S.; Zabriskie, J.B.; Krause, R.M.

    1976-07-01

    A radioimmunoassay has been developed for the measurement of antibodies to peptidoglycan in human sera including patients with rheumatic feaver and juvenile rheumatoid arthritis. The assay is based on the percentage of binding of the hapten /sup 125/I-L-Ala-..gamma..-D-Glu-L-Lys-D-Ala-D-Ala, the major peptide determinant of peptidoglycan. Because of differences in the avidity of the antibodies in different sera, the amount of antibody was expressed as pentapeptide hapten-binding capacity (pentapeptide-HBC in ng/ml of serum). Fourteen out of 105 normal blood donors had a pentapeptide-HBC value greater than or equal to 75 ng/ml serum. Values in healthy children 5 to 18 years of age were less than or equal to 50 ng/ml. Sixty-eight percent of the individuals with rheumatic fever had values greater than or equal to 75 ng/ml, an indication that streptococcal infections can stimulate an immune response to peptidoglycan. Thirty-five percent of the patients with juvenile rheumatoid arthritis had values greater than or equal to 75 ng/ml. Such a finding points to a possible association between bacterial infections and juvenile rheumatoid arthritis.

  19. Synthesis and in vivo studies of a selective ligand for the dopamine transporter: 3{beta}-(4-[{sup 125}I]iodophenyl) tropan-2{beta}-carboxylic acid isopropyl ester ([{sup 125}I]RTI-121)

    Energy Technology Data Exchange (ETDEWEB)

    Lever, John R.; Scheffel, Ursula; Stathis, Marigo; Seltzman, Herbert H.; Wyrick, Christopher D.; Abraham, Philip; Parham, Karol; Thomas, Brian F.; Boja, John W.; Kuhar, Michael J.; Carroll, F. Ivy

    1996-04-01

    A selective ligand for the dopamine transporter 3{beta}-(4-iodophenyl)tropan-2{beta}-carboxylic acid isopropyl ester (RTI-121) has been labeled with iodine-125 by electrophilic radioiododestannylation. The [{sup 125}I]RTI-121 was obtained in good yield (86 {+-} 7%, n = 3) with high radiochemical purity (>99%) and specific radioactivity (1210-1950 mCi/{mu}mol). After i.v. administration of [{sup 125}I]RTI-121 to mice, the rank order of regional brain tissue radioactivity (striatum > olfactory tubercles >> cortex, hippocampus, thalamus, hypothalamus, cerebellum) was consistent with dopamine transporter labeling. Specific in vivo binding in striatum and olfactory tubercles was saturable, and was blocked by the dopamine transporter ligands GBR 12,909 and ({+-})-nomifensine. By contrast, binding was not reduced by paroxetine, a serotonin transporter inhibitor, or desipramine, a norepinephrine transporter inhibitor. A variety of additional drugs having high affinities for recognition sites other than the neuronal dopamine transporter also had no effect. The [{sup 125}I]RTI-121 binding in striatum and olfactory tubercles was inhibited by d-amphetamine in dose-dependent fashion. Nonmetabolized radioligand represents 85% of the signal observed in extracts of whole mouse brain. Thus, [{sup 125}I]RTI-121 is readily prepared, and is a useful tracer for dopamine transporter studies in vivo.

  20. Synthesis, in vitro pharmacologic characterization, and preclinical evaluation of N-[2-(1'-piperidinyl)ethyl]-3-[125I]iodo-4-methoxybenzamide (P[125I]MBA) for imaging breast cancer.

    Science.gov (United States)

    John, C S; Bowen, W D; Fisher, S J; Lim, B B; Geyer, B C; Vilner, B J; Wahl, R L

    1999-05-01

    The goal of this study was to investigate the potential use of a radioiodinated benzamide, N-[2-(1'-piperidinyl)ethyl]-3-iodo[125I]-4-methoxybenzamide (P[125I]MBA), a sigma receptor binding radioligand for imaging breast cancer. The chemical and radiochemical syntheses of PIMBA are described. The pharmacological evaluation of PIMBA was carried out for sigma-1 and sigma-2 receptor sites. The in vivo pharmacokinetics of the radioiodinated benzamide were determined in rats and comparison of P[125I]MBA with Tc-99m sestamibi were made in a rat mammary tumor model. Sigma-1 affinity (Ki) for PIMBA in guinea pig brain membranes using [3H](+)pentazocine was found to be 11.82 +/- 0.68 nM, whereas sigma-2 affinity in rat liver using [3H]DTG (1,3-o-di-tolylguanidine) was 206 +/- 11 nM. Sites in guinea pig brain membranes labeled by P[125I]MBA showed high affinity for haloperidol, (+)-pentazocine, BD1008, and PIMBA (Ki = 4.87 +/- 1.49, 8.81 +/- 1.97, 0.057 +/- 0.005, 46.9 +/- 1.8 nM, respectively). Competition binding studies were carried out in human ductal breast carcinoma cells (T47D). A dose-dependent inhibition of specific binding was observed with several sigma ligands. Ki values for the inhibition of P[125I]MBA binding in T47D cells for haloperidol, N-[2-(1'-piperidinyl)]ethyl]4-iodobenzamide (IPAB), N-(N-benzylpiperidin-4-yl)-4-iodobenzamide (4-IBP), and PIMBA were found to be 1.30 +/- 0.07, 13 +/- 1.5, 5.19 +/- 2.3, 1.06 +/- 0.5 nM, respectively. The in vitro binding data in guinea pig brain membranes and breast cancer cells confirmed binding to sigma sites. The saturation binding of P[125I]MBA in T47D cells as studied by Scatchard analysis showed saturable binding, with a Kd = 94 +/- 7 nM and a Bmax = 2035 +/- 305 fmol/mg of proteins. Biodistribution studies in Sprague-Dawley rats showed a rapid clearance of P[125I]MBA from the normal organs. The potential of PIMBA in imaging breast cancer was evaluated in Lewis rats bearing syngeneic RMT breast cancers, a cancer that

  1. Complications after cardiac implantable electronic device implantations

    DEFF Research Database (Denmark)

    Kirkfeldt, Rikke Esberg; Johansen, Jens Brock; Nohr, Ellen Aagaard;

    2014-01-01

    Complications after cardiac implantable electronic device (CIED) treatment, including permanent pacemakers (PMs), cardiac resynchronization therapy devices with defibrillators (CRT-Ds) or without (CRT-Ps), and implantable cardioverter defibrillators (ICDs), are associated with increased patient...

  2. Synthesis of Sulochrin-125I and Its Binding Affinity as α-Glucosidase Inhibitor using Radioligand Binding Assay (RBA Method

    Directory of Open Access Journals (Sweden)

    W. Lestari

    2014-04-01

    Full Text Available Most of diabetics patients have type 2 diabetes mellitus or non insulin dependent diabetes mellitus. Treatment type 2 diabetes mellitus can be done by inhibiting α-glucosidase enzyme which converts carbohydrates into glucose. Sulochrin is one of the potential compounds which can inhibit the function of α-glucosidase enzyme. This study was carried out to obtain data of sulochrin binding with α-glucosidase enzyme as α-glucosidase inhibitor using Radioligand Binding Assay (RBA method. Primary reagent required in RBA method is labeled radioactive ligand (radioligand. In this study, the radioligand was sulochrin-125I and prior to sulochrin-125I synthesis, the sulochrin-I was synthesized. Sulochrin-I and sulochrin-125I were synthesized and their bindings were studied using Radioligand Binding Assay method. Sulochrin-I was synthesized with molecular formula C17H15O7I and molecular weight 457.9940. Sulochrin-125I was synthesized from sulochrin-I by isotope exchange method. From the RBA method, dissociation constant (Kd and maximum binding (Bmax were obtained 26.316 nM and Bmax 9.302 nM respectively. This low Kd indicated that sulochrin was can bind to α-glucosidase

  3. Acute changes in intra-alveolar tooth position and local clearance of /sup 125/I from the periodontal ligament

    Energy Technology Data Exchange (ETDEWEB)

    Edwall, B.; Berg, J.O.; Gazelius, B.; Edwall L.; Aars, H.

    1987-01-01

    Changes in intra-alveolar tooth position and local /sup 125/I clearance from the periodontal ligament (PDL) were monitored simultaneously in cats. Axial tooth movements, reflecting periodontal ligament volume changes, were measured with an ultrasonic transit time technique. Local blood flow changes in the PDL were studied indirectly by measuring the local clearance of /sup 125/I. Stimulation of the cervical sympathetic trunk caused an intrusive movement of the tooth with a concomitant reduction of the /sup 125/I-clearance. Infusion of noradrenaline induced a similar respone. Stimulation of the inferior alveolar nerve during systemic treatment with phentolamine caused an extrusive movement of the tooth with a concomitant increase in the clearance of the tracer from the PDL. Intra-arterial infusion of the vasodilator substance P mimicked that response. Fization of the tooth to the jaw bone, thus preventing an intrusive movement, did not change the reductions in clearance seen on sympathetic stimulation, indicating that this blood flow reduction was not dependent on tooth movement. A qualitative relation between PDL blood flow (as measured by local /sup 125/I clearance) and PDL volume (as measured by tooth position) in shown. The two variables measured are suggested to reflect two aspects of blood flow in the PDL. 22 refs.

  4. Electroless Sliver-Plating Process in the Preparation of 103Pd-125I Hybrid Brachytherapy Seed Cores

    Directory of Open Access Journals (Sweden)

    LI Zhong-yong1,2;CHEN Bin-da1;Lv Xiao-zhou1;LU Jin-hui1;CUI Hai-ping1,2

    2014-02-01

    Full Text Available Electroless 103Pd plating and electroless Ag plating and chemical 125I depositing were took place on the surface of carbon rods in turn, which was a reliable method for the preparation of 103Pd-125I hybrid brachytherapy seed cores. 103Pd and 125I were deposited on the same substrate effectively through silver coating as a bridge. The process of electroless Ag plating was a novel and important step in the preparation of 103Pd-125I hybrid seed. In this work, the process of electroless Ag plating was studied using 0.5×3.0 mm carbon rods with palladium coating as substrate, silver-ammino complex as precursor, 110mAg as radioactive tracer, and hydrazine as reductant. The optimum conditions were AgNO3 2g/L,Na2EDTA 40 g/L,NH3•H2O 16.25%,H4N2•H2O 5‰,pH=10,t=60 min,and T=35 ℃. Sliver deposited on each carbon rod was uniform, and sliver-coating was white and smooth.

  5. Radiosynthesis and in vivo evaluation of the pseudopeptide {delta}-opioid antagonist [{sup 125}I]-ITIPP({psi})

    Energy Technology Data Exchange (ETDEWEB)

    Collier, T.L. E-mail: TC311@columbia.edu; Schiller, P.W.; Waterhouse, R.N

    2001-05-01

    The radioiodinated tetrapeptide {delta}-opioid antagonist [{sup 125}I]ITIPP({psi}) [H-Tyr(3'I)-Tic{psi}[CH{sub 2}NH]Phe-Phe-OH] (Ki({delta}) 2.08 nM; Ki({mu})/Ki({delta}) = 1280) has been synthesized and evaluated as a potential lung tumour imaging agent. [{sup 125}I]ITIPP({psi}) was obtained, via electrophilic iodination, in 46% yield (>44,000 MBq/{mu}mol) from the parent TIPP({psi}). The biodistribution of [{sup 125}I]ITIPP({psi}) in nu/nu mice bearing SCLC-SW210.5 xenographs revealed good uptake and prolonged retention of radioactivity in organs known to possess {delta}-opioid receptors. Metabolite analysis showed that [{sup 125}I]ITIPP({psi}) was largely unmetabolized at 25 min PI and blocking studies showed significant reduction of uptake of the tracer in the brain, liver, intestine and tumor indicating that the iodinated tetrapeptide binds to {delta} opioid receptors in vivo.

  6. Relationship between alveolar bone measured by /sup 125/I absorptiometry with analysis of standardized radiographs: 2. Bjorn technique

    Energy Technology Data Exchange (ETDEWEB)

    Ortman, L.F.; McHenry, K.; Hausmann, E.

    1982-05-01

    The Bjorn technique is widely used in periodontal studies as a standardized measure of alveolar bone. Recent studies have demonstrated the feasibility of using /sup 125/I absorptiometry to measure bone mass. The purpose of this study was to compare /sup 125/I absorptiometry with the Bjorn technique in detecting small sequential losses of alveolary bone. Four periodontal-like defects of incrementally increasing size were produced in alveolar bone in the posterior segment of the maxilla of a human skull. An attempt was made to sequentially reduce the amount of bone in 10% increments until no bone remained, a through and through defect. The bone remaining at each step was measured using /sup 125/I absorptiometry. At each site the /sup 125/I absorptiometry measurements were made at the same location by fixing the photon source to a prefabricated precision-made occlusal splint. This site was just beneath the crest and midway between the borders of two adjacent teeth. Bone loss was also determined by the Bjorn technique. Standardized intraoral films were taken using a custom-fitted acrylic clutch, and bone measurements were made from the root apex to coronal height of the lamina dura. A comparison of the data indicates that: (1) in early bone loss, less than 30%, the Bjorn technique underestimates the amount of loss, and (2) in advanced bone loss, more than 60% the Bjorn technique overestimates it.

  7. Binding of /sup 125/I-labeled reovirus to cell surface receptors

    Energy Technology Data Exchange (ETDEWEB)

    Epstein, R.L.; Powers, M.L.; Rogart, R.B.; Weiner, H.L.

    1984-02-01

    Quantitative studies of /sup 125/I-labeled reovirus binding at equilibrium to several cell types was studied, including (1) murine L cell fibroblasts; (2) murine splenic T lymphocytes; (3) YAC cells, a murine lymphoma cell line; and (4) R1.1 cells, a murine thymoma cell line. Competition and saturation studies demonstrated (1) specific, saturable, high-affinity binding of reovirus types 1 and 3 to nonidentical receptors on L cell fibroblasts; (2) high-affinity binding of type 3 reovirus to murine splenic lymphocytes and R1.1 cells; (3) low-affinity binding of reovirus type 1 to lymphocytes and R1.1 cells; and (4) no significant binding of either serotype to YAC cells. Differences in the binding characteristics of the two reovirus serotypes to L cell fibroblasts were found to be a property of the viral hemagglutinin, as demonstrated using a recombinant viral clone. The equilibrium dissociation constant (Kd) for viral binding was of extremely high affinity (Kd in the range of 0.5 nM), and was slowly reversible. Experiments demonstrated temperature and pH dependence of reovirus binding and receptor modification studies using pronase, neuraminidase, and various sugars confirmed previous studies that reovirus receptors are predominantly protein in structure. The reovirus receptor site density was in the range of 2-8 X 10(4) sites/cell. These studies demonstrate that the pseudo-first-order kinetic model for ligand-receptor interactions provides a useful model for studying interactions of viral particles with membrane viral receptors. They also suggest that one cell may have distinct receptor sites for two serotypes of the same virus, and that one viral serotype may bind with different kinetics depending on the cell type.

  8. Exposure to environmental tobacco smoke measured by cotinine sup 125 I-radioimmunoassay

    Energy Technology Data Exchange (ETDEWEB)

    Knight, G.J.; Palomaki, G.E.; Lea, D.H.; Haddow, J.E. (Foundation for Blood Research, Scarborough, ME (USA))

    1989-06-01

    We describe a polyclonal-antiserum-based {sup 125}I-radioimmunoassay for cotinine that is suitable for measuring nonsmokers' passive exposure to tobacco smoke in the environment. The standard curve ranged from 0.25 to 12.0 micrograms/L, with an estimated lower limit of sensitivity of 0.2 microgram/L (95% B/Bo = 0.2 microgram/L; 50% B/Bo = 4.0 micrograms/L). The median within-assay CVs for patients' samples with cotinine values from 0.4 to 1.3, 1.4 to 2.4, 2.5 to 4.6, and 4.7 to 15.6 micrograms/L were 13.9%, 7.2%, 5.1%, and 5.7%, respectively. Between-assay CVs for two quality-control sera with average values of 1.53 and 3.68 micrograms/L were 14.3% and 7.8%, respectively. Analytical recoveries of cotinine from smokers' sera diluted in zero calibrant ranged from 91% to 116%. Cotinine values determined on 79 paired sera and urines from nonsmokers showed significant correlation with self-reported exposure to environmental tobacco smoke (r = 0.49, P less than 0.001 for sera; r = 0.57, P less than 0.001 for urine). The log of the values for serum and urine cotinine were also significantly correlated (r = 0.85, P less than 0.001). Evidently, polyclonal antiserum can be used to develop a cotinine assay for measuring exposure to environmental tobacco smoke that compares well with that described for monoclonal-based assays.

  9. Assessment of compensatory renal function and [125I]iothalamate clearance in sheep.

    Science.gov (United States)

    Filippich, L J; English, P B; Ainscow, J

    1985-11-01

    Compensatory renal function and sodium [125I]iothalamate clearance were studied in 4 adult Merino ewes. Renal clearances of inulin (CIN), iothalamate (CIOT), and p-aminohippurate (CPAH) were used to measure renal function before and 7 and 170 days after 50% and 75% reductions in renal mass. Renal mass reduction to 50% of normal was achieved by ligation of the right renal artery, and to 25% of normal by ligating the right renal artery and branches of the left renal artery. Renal function (CIN and CPAH) after 50% renal mass reduction was 78% of normal on postligation day (PLD) 7 and 64% of normal on PLD 170. This decrease in renal function between PLD 7 and 170 was significant (P less than 0.05). Renal function (CIN and CPAH) after 75% renal mass reduction was 55% of normal on PLD 7 and 48% on PLD 170; however, this decrease in renal function between PLD 7 and 170 was not significant. Results indicated that, shortly after 50% renal mass reduction by renal arterial ligation, renal function in ewes was greater than that previously reported after unilateral nephrectomy and that a further decrease in renal function developed within 6 months after ligation. The mean CIOT in healthy ewes was 2.46 ml/min/kg of body weight. In healthy ewes and in ewes after renal mass reduction, regression of the simultaneous CIOT and CIN was CIOT = 0.276 + 1.05 CIN. The CIOT was higher than the corresponding CIN, and remained significantly (P less than 0.01) and consistently higher. Therefore, iothalamate can be used to estimate glomerular filtration rate in sheep, although a correction factor is required.

  10. Monte Carlo study of interseed attenuation and tissue composition effect for clinical cases of prostate permanent implants.

    Science.gov (United States)

    Carrier, Jean-Francois; Beaulieu, Luc

    2006-03-01

    Monte Carlo simulations were used to study the interseed attenuation and the effect of tissue composition on prostate implant dosimetry. Using computed tomography images of postimplant analysis, the precise anatomy of the patient was considered voxel by voxel. The physical density of each voxel was set according to the Hounsfield Unit and the specific elemental composition of each voxel was set depending on the radiation-oncologist organ contours and the local density. Mixes of different tissues were available: muscle, prostate tissue, rectum tissue, adipose tissue, bone and prostate calcification. Typically, more than 300 combinations of elemental composition and density were used for each patient. The Monte Carlo dosimetry results were compared to the clinically approved TG43-based calculations for 30 patients. The results show an interseed attenuation of about 4.5% for the D90 parameter (minimal dose received by 90% of the target volume). The effect of the tissue composition varies from one patient to the other. Globally, the difference between the TG43-based calculations and the Monte Carlo results can reach more than 10 Gy for the D90 values. From a clinical perspective, the difference level can be non-negligible for the target volume and for the surrounding organs at risk.

  11. Simple detection of hepatitis C virus using {sup 125}I-2'-deoxyuridine triphosphate and gamma counter

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Soo Jin; Ahn, S. H.; Chung, W. S.; Woo, K. S.; Lim, S. J.; Choi, C. W.; Lim, S. M. [Korea Cancer Center Hospital, Seoul (Korea, Republic of)

    2000-07-01

    Hepatitis C Virus (HCV) is the major cause of post transfusion and sporadic non A, non B hepatitis. Current infection of HCV can be detected by PCR method. Using PCR, it has been possible to detect HCV viremia prior to immunological sero-conversion and to detect fluctuation of viremia in antibody-positive chronic HCV patients undergoing therapy with interferon. In this study, we established the simple method to detect HCV DNA by incorporation of {sup 125}I-deoxyuridine triphosphate(dUTP) into DNA during the PCR, and counted the radioactivity of PCR product by gamma counter. {sup 125}I-2'-deoxyuridine 5'-triphosphate was prepared, and incorporated into DNA during PCR. dUTP was radiolabeled by the iododemercuration of 5-mercuri intermediate. Iododemercuration labeling was completed with 98% yield and the obtained product was incorporated into DNA without further purification. After incorporation, covalently bonded radioiodine substituent was remained stable during PCR procedure HCV positive standard and positive patient sera in immunological assay were centrifuged. HCV RNA is isolated from by GTC(Guanidine Thiocyanate) and phenol/chloroform extraction method and synthesized complementary DNA by using reverse transcriptase. The '1{sup 25}I-dUTP was incorporated into HCV C DNA during PCR. PCR product purified by fiber matrix column and counted by gamma counter. PCR products were electrophoresized, and autoradiography image obtained. Amplified HCV DNA by {sup 125}I-dUTP PCR obtained the band on the gel by electrophoresis and autoradiography at the same position. In patient sera, radioactivity of HCV positive sample was 8 times higher than HCV negative viremia sample. We established HCV detection method using {sup 125}I-dUTP. {sup 125}I-dUTP PCR detection of HCV is convenient and reporducible.

  12. 2-(/sup 125/I)iodomelatonin binding sites in hamster brain membranes: pharmacological characteristics and regional distribution

    Energy Technology Data Exchange (ETDEWEB)

    Duncan, M.J.; Takahashi, J.S.; Dubocovich, M.L.

    1988-05-01

    Studies in a variety of seasonally breeding mammals have shown that melatonin mediates photoperiodic effects on reproduction. Relatively little is known, however, about the site(s) or mechanisms of action of this hormone for inducing reproductive effects. Although binding sites for (3H)melatonin have been reported previously in bovine, rat, and hamster brain, the pharmacological selectivity of these sites was never demonstrated. In the present study, we have characterized binding sites for a new radioligand, 2-(125I)iodomelatonin, in brains from a photoperiodic species, the Syrian hamster. 2-(125I)Iodomelatonin labels a high affinity binding site in hamster brain membranes. Specific binding of 2-(125I)iodomelatonin is rapid, stable, saturable, and reversible. Saturation studies demonstrated that 2-(125I)iodomelatonin binds to a single class of sites with an affinity constant (Kd) of 3.3 +/- 0.5 nM and a total binding capacity (Bmax) of 110.2 +/- 13.4 fmol/mg protein (n = 4). The Kd value determined from kinetic analysis (3.1 +/- 0.9 nM; n = 5) was very similar to that obtained from saturation experiments. Competition experiments showed that the relative order of potency of a variety of indoles for inhibition of 2-(125I)iodomelatonin binding site to hamster brain membranes was as follows: 6-chloromelatonin greater than or equal to 2-iodomelatonin greater than N-acetylserotonin greater than or equal to 6-methoxymelatonin greater than or equal to melatonin greater than 6-hydroxymelatonin greater than or equal to 6,7-dichloro-2-methylmelatonin greater than 5-methoxytryptophol greater than 5-methoxytryptamine greater than or equal to 5-methoxy-N,N-dimethyltryptamine greater than N-acetyltryptamine greater than serotonin greater than 5-methoxyindole (inactive).

  13. Synthesis and characterization of [{sup 125}I]N-(2-aminoethyl)-4-iodobenzamide as a selective monoamine oxidase B inhibitor

    Energy Technology Data Exchange (ETDEWEB)

    Rafii, Hamid; Chalon, Sylvie; Ombetta, Jean-Edouard; Frangin, Yves; Garreau, Lucette; Dognon, Anne-Marie; Lena, Isabelle; Bodard, Sylvie; Vilar, Marie-Paule; Besnard, Jean-Claude; Guilloteau, Denis

    1995-07-01

    We described the radiosynthesis of an analog of Ro 16-6491, [{sup 125}I]N-(2-aminoethyl)-4-iodobenzamide, for SPECT exploration of the monoamine oxidase B (MAO-B) in human brain. The radiolabelling was carried out by nucleophilic exchange of the brominated precursor at solid-state phase in presence of ammonium sulphate. The radiochemical purity of radioiodinated product was higher than 95%. In comparison with Ro 16-6491, the in vitro studies showed a good selectivity of stable N-(2-aminoethyl)-4-iodobenzamide for MAO-B but a slightly lower affinity. Biodistribution studies in the rat showed a high and selective uptake of this compound in the pineal gland 1 h after i.v. injection. The cerebral uptake was low, but the coupling of [{sup 125}I]N-(2-aminoethyl)-4-iodobenzamide with a lipophilic radical to enhance the passage through the blood-brain barrier can be envisaged.

  14. /sup 125/I)-(d(CH2)5, Sar7)AVP: a selective radioligand for V1 vasopressin receptors

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, J.M.; Abrahams, J.M.; Phillips, P.A.; Mendelsohn, F.A.; Grzonka, Z.; Johnston, C.I.

    1989-01-01

    Arginine8-vasopressin (AVP) acts on vascular and hepatic V1 receptors to influence blood pressure and glycogenolysis respectively. We have radioiodinated the AVP V1 receptor antagonist, (1-(beta-mercapto-beta, beta-cyclopentamethylenepropionic-acid), 7-sarcosine, 8-arginine) vasopressin ((d(CH2)5, Sar7)AVP) and determined its receptor-binding properties in rat liver and kidney plasma membranes. The binding was of high affinity to single classes of receptors (liver: Kd = 3.0 nM and Bmax = 530 +/- 10 fmol/mg protein, kidney: Kd = 0.5 +/- 0.9 nM and Bmax = 11 +/- 8 fmol/mg protein). Competition of (125I)-(d(CH2)5, Sar7)AVP binding by unlabelled AVP analogues gave the following order of potency in both tissues, consistent with that expected for binding to a V1 receptor: (d(CH2)5, Tyr(Me)2)AVP greater than AVP greater than (d(CH2)5, D-Ile2, Ile4) AVP greater than DDAVP. No degradation of (125I)-(d(CH2)5, Sar7)AVP during incubation or storage was detected by HPLC analysis. We have used (125I)-(d(CH2)5, Sar7)AVP and in vitro autoradiography to demonstrate its use in localizing brain AVP receptors. These studies suggest that (125I)-(d(CH2)5, Sar7)AVP is a suitable selective radioligand for labelling V1 receptors and will provide a valuable tool for the study of the localization and regulation of AVP V1 receptors in tissues and in receptor isolation.

  15. Evaluation of new iodinated acridine derivatives for targeted radionuclide therapy of melanoma using 125I, an Auger electron emitter.

    Science.gov (United States)

    Gardette, Maryline; Papon, Janine; Bonnet, Mathilde; Desbois, Nicolas; Labarre, Pierre; Wu, Ting-Dee; Miot-Noirault, Elisabeth; Madelmont, Jean-Claude; Guerquin-Kern, Jean-Luc; Chezal, Jean-Michel; Moins, Nicole

    2011-12-01

    The increasing incidence of melanoma and the lack of effective therapy on the disseminated form have led to an urgent need for new specific therapies. Several iodobenzamides or analogs are known to possess specific affinity for melanoma tissue. New heteroaromatic derivatives have been designed with a cytotoxic moiety and termed DNA intercalating agents. These compounds could be applied in targeted radionuclide therapy using (125)I, which emits Auger electrons and gives high-energy, localized irradiation. Two iodinated acridine derivatives have been reported to present an in vivo kinetic profile conducive to application in targeted radionuclide therapy. The aim of the present study was to perform a preclinical evaluation of these compounds. The DNA intercalating property was confirmed for both compounds. After radiolabeling with (125)I, the two compounds induced in vitro a significant radiotoxicity to B16F0 melanoma cells. Nevertheless, the acridine compound appeared more radiotoxic than the acridone compound. While cellular uptake was similar for both compounds, SIMS analysis and in vitro protocol showed a stronger affinity for melanin with acridone derivative, which was able to induce a predominant scavenging process in the melanosome and restrict access to the nucleus. In conclusion, the acridine derivative with a higher nuclear localization appeared a better candidate for application in targeted radionuclide therapy using (125)I.

  16. {sup 125}I brachytherapy alone for recurrent or locally advanced adenoid cystic carcinoma of the oral and maxillofacial region

    Energy Technology Data Exchange (ETDEWEB)

    Huang, M.W.; Zheng, L.; Liu, S.M.; Shi, Y.; Zhang, J.; Yu, G.Y.; Zhang, J.G. [Peking Univ. School and Hospital of Stomatology, Beijing (China). Dept. of Oral and Maxillofacial Surgery

    2013-06-15

    Background and purpose: This retrospective study was to evaluate the local control and survival of {sup 125}I brachytherapy for recurrent and/or locally advanced adenoid cystic carcinoma (ACC) of the oral and maxillofacial region. Patients and methods: A total of 38 patients with recurrent and/or locally advanced ACC of the oral and maxillofacial region received {sup 125}I brachytherapy alone from 2001-2010. Twenty-nine were recurrent cases following previous surgery and radiation therapy. The other 9 cases involved primary tumors. Overall, 12 tumors were located in the major salivary glands, 12 in the minor salivary glands, and 14 in the paranasal region, the nasal cavity or the skull base. The prescribed dose was 100-160 Gy. Results: Patients were followed for 12-122 months (median 51 months). The 2-, 5-, and 10-year local tumor control rates were 86.3, 59, and 31.5 %, respectively. The 2-, 5-, and 10-year overall survival rates were 92.1, 65 and 34.1 %, respectively. Tumors > 6 cm had significantly lower local control and survival rates. No severe complications were observed during follow-up. Conclusion: {sup 125}I brachytherapy is a feasible and effective modality for the treatment of locally advanced unresectable or recurrent ACC. (orig.)

  17. Reoxygenation, but neither hypoxia nor intermittent ischemia, increases ( sup 125 I)endothelin-1 binding to rat cardiac membranes

    Energy Technology Data Exchange (ETDEWEB)

    Liu, J.J.; Gu, X.H.; Casley, D.J.; Nayler, W.G. (Univ. of Melbourne, Heidelberg, Victoria (Australia))

    1990-03-01

    Standard binding techniques were used to establish whether either hypoxia, reoxygenation, perfusion under acidotic conditions, or stunning of the myocardium resembles ischemia and postischemic reperfusion in increasing cardiac membrane ({sup 125}I)endothelin-1 (ET-1) binding site density (Bmax). Membranes from aerobically perfused rat hearts bound ({sup 125}I)ET-1 to a single population of sites, with an affinity (KD) of 0.093 +/- 0.004 nM and a Bmax of 98.8 +/- 5.2 fmol/mg of protein. Bmax was increased (p less than 0.01) after 30 min of global ischemia, and further increased upon reperfusion, without changes in KD or selectivity. Neither three 10 min episodes of ischemia separated by 15 min of perfusion, nor perfusion at pH 6.8 instead of 7.4, nor 60 min of hypoxia altered Bmax, KD, or selectivity. Reoxygenation after 60 min of hypoxia increased Bmax (p less than 0.01) and KD (p less than 0.01) without changing selectivity. These results are interpreted to mean that the ischemia-induced increase in Bmax for ({sup 125}I)ET-1 cannot be explained simply in terms of the ischemia-induced acidosis, or the accompanying reduction in tissue adenosine triphosphate and creatine phosphate.

  18. Low elastic modulus Ti–Ta alloys for load-bearing permanent implants: Enhancing the biodegradation resistance by electrochemical surface engineering

    Energy Technology Data Exchange (ETDEWEB)

    Kesteven, Jazmin [Biomaterials and Engineering Materials (BEM) Laboratory, School of Engineering and Physical Sciences, James Cook University, Townsville, Queensland 4811 (Australia); Kannan, M. Bobby, E-mail: bobby.mathan@jcu.edu.au [Biomaterials and Engineering Materials (BEM) Laboratory, School of Engineering and Physical Sciences, James Cook University, Townsville, Queensland 4811 (Australia); Walter, Rhys; Khakbaz, Hadis [Biomaterials and Engineering Materials (BEM) Laboratory, School of Engineering and Physical Sciences, James Cook University, Townsville, Queensland 4811 (Australia); Choe, Han-Choel [Department of Dental Materials, Chosun University, Gwangju 501-759 (Korea, Republic of)

    2015-01-01

    In this study, the in vitro degradation behaviour of titanium–tantalum (Ti–Ta) alloys (10–30 wt.% Ta) was investigated and compared with conventional implant materials, i.e., commercially pure titanium (Cp-Ti) and titanium–aluminium–vanadium (Ti6Al4V) alloy. Among the three Ti–Ta alloys studied, the Ti20Ta (6.3 × 10{sup −4} mm/y) exhibited the lowest degradation rate, followed by Ti30Ta (1.2 × 10{sup −3} mm/y) and Ti10Ta (1.4 × 10{sup −3} mm/y). All the Ti–Ta alloys exhibited lower degradation rate than that of Cp-Ti (1.8 × 10{sup −3} mm/y), which suggests that Ta addition to Ti is beneficial. As compared to Ti6Al4V alloy (8.1 × 10{sup −4} mm/y), the degradation rate of Ti20Ta alloy was lower by ∼ 22%. However, the Ti30Ta alloy, which has closer elastic modulus to that of natural bone, showed ∼ 48% higher degradation rate than that of Ti6Al4V alloy. Hence, to improve the degradation performance of Ti30Ta alloy, an intermediate thin porous layer was formed electrochemically on the alloy followed by calcium phosphate (CaP) electrodeposition. The coated Ti30Ta alloy (3.8 × 10{sup −3} mm/y) showed ∼ 53% lower degradation rate than that of Ti6Al4V alloy. Thus, the study suggests that CaP coated Ti30Ta alloy can be a viable material for load-bearing permanent implants. - Highlights: • In vitro degradation of titanium–tantalum (Ti–Ta) alloys was studied. • Ta addition to Ti is beneficial for better degradation resistance. • Ti–Ta alloys perform better than commercially pure Ti. • Calcium phosphate coated Ti–Ta alloy is superior to Ti6Al4V alloy.

  19. The initial experience of ~(125)I seeds brachytherapy for patients with oral carcinoma%~(125)I放射性粒子近距离放射治疗口腔癌的初步临床应用

    Institute of Scientific and Technical Information of China (English)

    于香红; 高飞; 李振家; 窦卫涛; 韩旭健; 武乐斌

    2009-01-01

    Objective To evaluate the efficacy of ~(125)I radioactive seeds implantation and ~(125)I plaque brachytherapy for oral carcinoma. Methods Eighteen patients with oral carcinoma confirmed by cytology or histopathology were included in this study, Twelve patients with tongue cancer and six patients with gingival carcinoma, there were 20 ulcerative lesions and 10 metastatic cervical lymph nodes. The mean diameter is (2.3±0.7)cm and(2.8±1.7)cm respectively. The patients were treated with both interstitial implantation of ~(125)I seeds and ~(125)I plaque brachytherapy or with ~(125)I plaque brachytherapy only according to patient's individual conditions.The metastatic cervical lymph nodes were treated with CT-guided interstitial implantation of ~(125)I seeds.The sizes of ulcerative lesions and lymph nodes were observed at 1,3,6 months following treatment,and statistical analysis of the sizes of ulcerative lesions were evaluated by paired t-test.Results After 1,3,6 months follow-up,The mean diameters of ulcerative lesions were(2.1±0.6)cm(t=3.559,P<0.01),(1.7±0.5)cm(t=7.609,P<0.01),(0.7±0.6)cm(t=11.508,P<0.01),the cervical lymph nodes showed reduced size. Furthermore, PET-CT images showed a significant decrease in the metabolic activity of treated tumor. After six months, the focus of infection were healing in 8 patients, the cervical lymph nodes of one patient relapsed after ~(125)I implantation again. Patients were followed for 7 to 28 months, all patients were still alive. Conclusion Interstitial ~(125)I radioactive seeds implantation and ~(125)I plaque brachytherapy provide an effective, safe treatment for oral cancer.%目的 探讨放射性~(125)I粒子组织间置入及粒子敷贴治疗口腔癌的操作方法和临床效果.方法 18例口腔癌患者,均经脱落细胞学或组织病理学证实,其中舌癌12例、牙龈癌6例,溃疡灶20个,平均直径(2.3±0.7)cm,颈部转移淋巴结10个,平均直径(2.8±1.7)cm.根据病变情况采用~(125)I

  20. Feasibility of MR Imaging/MR Spectroscopy-Planned Focal Partial Salvage Permanent Prostate Implant (PPI) for Localized Recurrence After Initial PPI for Prostate Cancer

    Energy Technology Data Exchange (ETDEWEB)

    Hsu, Charles C., E-mail: hsucc@radonc.ucsf.edu [Department of Radiation Oncology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Hsu, Howard [Department of Radiation Oncology, New York University, New York, New York (United States); Pickett, Barby [Department of Radiation Oncology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Crehange, Gilles [Department of Radiation Oncology, Dijon University, Dijon (France); Hsu, I-Chow Joe; Dea, Ryan [Department of Radiation Oncology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Weinberg, Vivian [Biostatistics and Computational Biology Core, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Gottschalk, Alexander R. [Department of Radiation Oncology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Kurhanewicz, John [Department of Radiology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Shinohara, Katsuto [Department of Urology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States); Roach, Mack [Department of Radiation Oncology, University of California, San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California (United States)

    2013-02-01

    Purpose: To assess the feasibility of magnetic resonance imaging (MRI)-planned partial salvage permanent prostate implant (psPPI) among patients with biopsy-proven local recurrence after initial PPI without evidence of distant disease. Methods and Materials: From 2003-2009, 15 patients underwent MRI/magnetic resonance spectroscopy (MRS) planning for salvage brachytherapy (psPPI, I-125 [n=14; 144 Gy]; Pd-103 [n=1; 125 Gy]) without hormone therapy. Full dose was prescribed to areas of recurrence and underdosage, without entire prostate implantation. Limiting urethral and rectal toxicity was prioritized. Follow-up was from salvage date to prostate-specific antigen (PSA) concentration failure (Phoenix criteria = nadir + 2.0; ASTRO = 3 consecutive rises), recurrence, distant metastases, or last follow-up PSA level. Progression-free survival (PFS) was defined as no PSA failure or biopsy-proven recurrence without all-cause mortality. Toxicity was scored using Common Terminology Criteria for Adverse Events version 4.0. Results: At salvage, median age was 68 years, and PSA concentration was 3.5 ng/mL (range, 0.9-5.6 ng/mL). Abnormal MRI/MRS findings were evident in 40% of patients. Biopsy-proven recurrences consisted of a single focus (80%) or 2 foci (20%). At recurrence, Gleason score was 6 (67%) or {>=}7 (27%). Median interval between initial and salvage implantation was 69 months (range, 28-132 months). psPPI planning characteristics limited doses to the rectum (mean V100 = 0.5% [0.07 cc]) and urethra (V100 = 12% [0.3 cc]). At median follow-up (23.3 months; range, 8-88 months), treatment failure (n=2) resulted only in localized recurrence; both patients underwent second psPPI with follow-up PSA tests at 12 and 26 months, resulting in 0.6 and 0.7 ng/mL, respectively. American Society for Radiation Oncology PFS rates at 1, 2, and 3 years were 86.7%, 78.4%, and 62.7%, respectively, with 5 patients for whom treatment failed (n=3 with negative transrectal ultrasound

  1. Study on preparation of 125I-RC-160 with NBS and its biodistribution in animals%125I-RC-160的NBS标记法研究及体内生物学分布特征

    Institute of Scientific and Technical Information of China (English)

    王喆; 汪静; 程时武; 李国权

    2004-01-01

    目的: 研究一种125I直接标记RC-160的简便高效的方法,并观察125I-RC-160在正常小鼠体内的生物学分布特征.方法: 采用N-溴代琥珀酸亚胺(NBS)作为氧化剂,在RC-160定量的反应体系中加入不同量的125I 与NBS,探索标记的最佳反应比例;纯化后产物进行正常小鼠体内生物学分布检测.结果: 反应体系最佳比例为RC-160 ∶125I ∶NBS=10 μg ∶7.4 MBq ∶30 μg,标记率可达到76.9﹪,经Sep-Pak C18反相色谱柱纯化,放化纯达到95.7﹪;标记产物在血液、心肌、肾脏中清除快,肺脏浓集度最高,肝、脾、胃肠浓集度较高.结论: 本方法步骤简便,标记率高,是一种比较理想的碘标方法,标记肽主要经消化系统代谢.

  2. Effects of different batches of /sup 125/iodine on properties of /sup 125/I-hFSH and characteristics of radioligand-receptor assays

    Energy Technology Data Exchange (ETDEWEB)

    Melson, B.E.; Sluss, P.M.; Reichert, L.E. Jr.

    1987-02-01

    Radioiodination of highly purified human follicle-stimulating hormone (hFSH) (4000 IU/mg) was performed every other week for 23 weeks using 2 mCI carrier free Na/sup 125/I (Amersham Corp., 15 mCi/micrograms I2) in the presence of lactoperoxidase. Incorporation of /sup 125/I into hFSH was determined by the method of R. C. Greenwood, W. M. Hunter, and J. S. Grover (1963) Biochem. J. 89, 114). Hormone binding was studied in vitro under steady-state conditions (16 h, 20 degrees C) using different calf testis membrane preparations having similar receptor characteristics. Each /sup 125/I-hFSH preparation was characterized for maximum bindability, specific activity of bindable radioligand as determined by self-displacement analysis, and by determination of Ka and Rt. Incorporation of /sup 125/I into FSH was relatively constant over the large number of experiments (62.4 +/- 6.4 microCi/micrograms; n = 23). By comparison, however, specific radioactivity of the receptor bindable fraction of /sup 125/I-hFSH was related to the lot of /sup 125/I utilized, and was significantly (P less than or equal to 0.01) lower and more variable (28.7 +/- 10.5 microCi/micrograms). Maximum bindability of /sup 125/I-hFSH was not correlated to specific activity (r = 0.06) but was negatively correlated to hFSH /sup 125/I incorporation (r = -0.47; P less than or equal to 0.05). These observations demonstrate the need to assess the quality of each batch of radioligand before undertaking radioligand-receptor assays and suggest that differences in Na/sup 125/I lots affect specific radioactivity of the radioligand and its receptor binding characteristics.

  3. Specific binding of /sup 125/I-salmon calcitonin to rat brain. Regional variation and calcitonin specificity

    Energy Technology Data Exchange (ETDEWEB)

    Nakamuta, H.; Furukawa, S.; Koida, M. (Nagasaki Univ. (Japan). Faculty of Pharmaceutical Sciences); Yajima, H.; Orlowski, R.C.

    1981-02-01

    Rat brain particulate fraction was found to contain binding sites for /sup 125/I-Salmon Calcitonin-I (/sup 125/I-SCT). Maximum binding occurred in the physiological pH range of 7.25 - 7.5. The binding reaction proceeded in a temperature-dependent manner. Binding sites were broadly distributed among the various rat brain regions and considerable regional differences existed in the affinity and density as detected by Scatchard analysis. The highest affinity was recorded in the case of the hypothalamus and the lowest in the case of the cerebellum. The KD (nM) and Bmax (pmole/mg protein) estimated for the binding to four regions were as follows: hypothalamus: 1.4 and 0.19, midbrain, hippocampus plus striatum: 1.5 and 0.08, pon plus medulla oblongata: 3.0 and 0.15 and cerebellum: 8.3 and 0.20. Using a particulate fraction of rat brain void of cerebellum and cortices, a binding assay for calcitonins was developed. Binding of /sup 125/I-SCT was inhibited by unlabeled salmon, (Asu sup(1,7))-eel and porcine calcitonins in a dose-dependent manner and the IC50s were 2.0, 8.0 and 30 nM, respectively. The IC50s were comparable to those estimated using a kidney particulate fraction. Human calcitonin, ..beta..-endorphin and substance P were weak inhibitors of the binding. Other peptides, drugs and putative neurotransmitters tested (totally 23 substances) failed to inhibit the binding at concentrations of 1.0 ..mu..M. The physiological significance of brain binding sites for calcitonin, with the possibility that the brain may possess endogenous ligands for these sites are discussed.

  4. Radiobiology for eye plaque brachytherapy and evaluation of implant duration and radionuclide choice using an objective function

    Energy Technology Data Exchange (ETDEWEB)

    Gagne, Nolan L.; Leonard, Kara L.; Rivard, Mark J. [Department of Radiation Oncology, Tufts University School of Medicine, Boston, Massachusetts 02111 (United States)

    2012-06-15

    Purpose: Clinical optimization of Collaborative Ocular Melanoma Study (COMS) eye plaque brachytherapy is currently limited to tumor coverage, consensus prescription dosage, and dose calculations to ocular structures. The biologically effective dose (BED) of temporary brachytherapy treatments is a function of both chosen radionuclide R and implant duration T. This study endeavored to evaluate BED delivered to the tumor volume and surrounding ocular structures as a function of plaque position P, prescription dose, R, and T. Methods: Plaque-heterogeneity-corrected dose distributions were generated with MCNP5 for the range of currently available COMS plaques loaded with sources using three available low-energy radionuclides. These physical dose distributions were imported into the PINNACLE{sup 3} treatment planning system using the TG-43 hybrid technique and used to generate dose volume histograms for a T = 7 day implant within a reference eye geometry including the ciliary body, cornea, eyelid, foveola, lacrimal gland, lens, optic disc, optic nerve, retina, and tumor at eight standard treatment positions. The equation of Dale and Jones was employed to create biologically effective dose volume histograms (BEDVHs), allowing for BED volumetric analysis of all ROIs. Isobiologically effective prescription doses were calculated for T = 5 days down to 0.01 days, with BEDVHs subsequently generated for all ROIs using correspondingly reduced prescription doses. Objective functions were created to evaluate the BEDVHs as a function of R and T. These objective functions are mathematically accessible and sufficiently general to be applied to temporary or permanent brachytherapy implants for a variety of disease sites. Results: Reducing T from 7 to 0.01 days for a 10 mm plaque produced an average BED benefit of 26%, 20%, and 17% for {sup 103}Pd, {sup 125}I, and {sup 131}Cs, respectively, for all P; 16 and 22 mm plaque results were more position-dependent. {sup 103}Pd produced a 16

  5. Novel /sup 125/I radioimmunoassay for the analysis of. delta. /sup 9/-tetrahydrocannabinol and its metabolites in human body fluids

    Energy Technology Data Exchange (ETDEWEB)

    Law, B.; Mason, P.A.; Moffat, A.C.; King, L.J.

    A cannabinoid radioimmunoassay (RIA) that detects some of the major ..delta../sup 9/-THC metabolites is developed and evaluated for use in forensic science. It incorporates a novel /sup 125/I radiotracer, is sensitive, reliable, relatively quick, and simple to use. The RIA uses a commercially available antiserum and detects a number of cannabinoid metabolites, including ..delta../sup 9/-THC-11-oic acid and its glucuronide conjugate in biological fluids. The method was successfully applied to the analysis of blood and urine samples submitted for forensic analysis.

  6. Determination of dosimetric characteristics of 125I-103Pd brachytherpy source with Monte-Carlo method%125I-103Pd复合近距离治疗源剂量参数的蒙特卡罗确定

    Institute of Scientific and Technical Information of China (English)

    曹振; 赵华立; 谢芹; 张文在; 冯跟胜; 王晓静; 张子健

    2013-01-01

    根据AAPM TG43U1推荐的种子源剂量参数计算公式,得到125I-103Pd复合种子源剂量参数计算公式,并且推广到n种放射性核素复合种子源剂量参数计算公式.使用蒙特卡罗方法计算125I-103Pd复合种子源的剂量率常数、径向剂量函数和各向异性函数的数值,对径向剂量函数和各向异性函数进行拟合,得到经验公式.使用单一源125I的参数计算结果和相关数据进行了比较.得到单一源125I的剂量率常数为0.959(cGy·h-1·U-1),与AAPM TG43U1中一种相类似的种子源6711 (AH)的推荐值相差0.6093%.

  7. Urinary and Rectal Toxicity Profiles After Permanent Iodine-125 Implant Brachytherapy in Japanese Men: Nationwide J-POPS Multi-institutional Prospective Cohort Study

    Energy Technology Data Exchange (ETDEWEB)

    Ohashi, Toshio, E-mail: ohashi@rad.med.keio.ac.jp [Keio University School of Medicine, Tokyo (Japan); Yorozu, Atsunori; Saito, Shiro [National Hospital Organization Tokyo Medical Center, Tokyo (Japan); Tanaka, Nobumichi [Nara Medical University School of Medicine, Nara (Japan); Katayama, Norihisa [Okayama University School of Medicine, Okayama (Japan); Kojima, Shinsuke; Maruo, Shinichiro; Kikuchi, Takashi [Translational Research Informatics Center, Hyogo (Japan); Dokiya, Takushi [Kyoundo Hospital, Tokyo (Japan); Fukushima, Masanori [Translational Research Informatics Center, Hyogo (Japan); Yamanaka, Hidetoshi [Institutes of Preventive Medicine, Kurosawa Hospital, Gunma (Japan)

    2015-09-01

    Purpose: To assess, in a nationwide multi-institutional cohort study begun in 2005 and in which 6927 subjects were enrolled by 2010, the urinary and rectal toxicity profiles of subjects who enrolled during the first 2 years, and evaluate the toxicity profiles for permanent seed implantation (PI) and a combination therapy with PI and external beam radiation therapy (EBRT). Methods and Materials: Baseline data for 2339 subjects out of 2354 patients were available for the analyses. Toxicities were evaluated using the National Cancer Institute's Common Terminology Criteria for Adverse Events, and the International Prostate Symptom Scores were recorded prospectively until 36 months after radiation therapy. Results: Grade 2+ acute urinary toxicities developed in 7.36% (172 of 2337) and grade 2+ acute rectal toxicities developed in 1.03% (24 of 2336) of the patients. Grade 2+ late urinary and rectal toxicities developed in 5.75% (133 of 2312) and 1.86% (43 of 2312) of the patients, respectively. A higher incidence of grade 2+ acute urinary toxicity occurred in the PI group than in the EBRT group (8.49% vs 3.66%; P<.01). Acute rectal toxicity outcomes were similar between the treatment groups. The 3-year cumulative incidence rates for grade 2+ late urinary toxicities were 6.04% versus 4.82% for the PI and the EBRT groups, respectively, with no significant differences between the treatment groups. The 3-year cumulative incidence rates for grade 2+ late rectal toxicities were 0.90% versus 5.01% (P<.01) for the PI and the EBRT groups, respectively. The mean of the postimplant International Prostate Symptom Score peaked at 3 months, but it decreased to a range that was within 2 points of the baseline score, which was observed in 1625 subjects (69.47%) at the 1-year follow-up assessment. Conclusions: The acute urinary toxicities observed were acceptable given the frequency and retention, and the late rectal toxicities were more favorable than those of other

  8. Biodistribution and fate of core-labeled (125)I polymeric nanocarriers prepared by Flash NanoPrecipitation (FNP).

    Science.gov (United States)

    Tang, Christina; Edelstein, Jasmine; Mikitsh, John L; Xiao, Edward; Hemphill, Aaron H; Pagels, Robert; Chacko, Ann-Marie; Prud'homme, Robert

    2016-04-14

    Non-invasive medical imaging techniques such as positron emission tomography (PET) imaging are powerful platforms to track the fate of radiolabeled materials for diagnostic or drug delivery applications. Polymer-based nanocarriers tagged with non-standard PET radionuclides with relatively long half-lives (e.g. (64)Cu: t1/2 = 12.7 h, (76)Br: t1/2 = 16.2h, (89)Zr: t1/2 = 3.3 d, (124)I: t1/2 = 4.2 d) may greatly expand applications of nanomedicines in molecular imaging and therapy. However, radiolabeling strategies that ensure stable in vivo association of the radiolabel with the nanocarrier remain a significant challenge. In this study, we covalently attach radioiodine to the core of pre-fabricated nanocarriers. First, we encapsulated polyvinyl phenol within a poly(ethylene glycol) coating using Flash NanoPrecipitation (FNP) to produce stable 75 nm and 120 nm nanocarriers. Following FNP, we radiolabeled the encapsulated polyvinyl phenol with (125)I via electrophilic aromatic substitution in high radiochemical yields (> 90%). Biodistribution studies reveal low radioactivity in the thyroid, indicating minimal leaching of the radiolabel in vivo. Further, PEGylated [(125)I]PVPh nanocarriers exhibited relatively long circulation half-lives (t1/2 α = 2.9 h, t1/2 β = 34.9 h) and gradual reticuloendothelial clearance, with 31% of injected dose in blood retained at 24 h post-injection.

  9. Ocular Brachytherapy Dosimetry for 103Pd and 125I in The Presence of Gold Nanoparticles: Monte Carlo Study

    CERN Document Server

    Asadi, S; Vahidian, M; Marghchouei, M; Masoudi, S Farhad

    2015-01-01

    The aim of the present Monte Carlo study is to evaluate the variation of energy deposition in healthy tissues in the human eye which is irradiated by brachytherapy sources in comparison with the resultant dose increase in the gold nanoparticle(GNP)-loaded choroidal melanoma. The effects of these nanoparticles on normal tissues are compared between 103Pd and 125I as two ophthalmic brachytherapy sources. Dose distribution in the tumor and healthy tissues have been taken into account for both mentioned brachytherapy sources. Also, in a certain point of the eye, the ratio of the absorbed dose by the normal tissue in the presence of GNPs to the absorbed dose by the same point in the absence of GNPs has been calculated. In addition, differences observed in the comparison of simple water phantom and actual simulated human eye in presence of GNPs are also a matter of interest that have been considered in the present work. The results show that the calculated dose enhancement factor in the tumor for 125I is higher tha...

  10. Serum prostate-specific acid phosphatase: development and validation of a specific radioimmunoassay. [/sup 125/I tracer technique

    Energy Technology Data Exchange (ETDEWEB)

    Vihko, P.; Sajanti, E.; Jaenne, O.; Peltonen, L.; Vihko, R.

    1978-11-01

    We describe radioimmunoassay for human prostatic acid phosphatase (orthophosphoric-monoester phosphohydrolase (acid optimum), EC 3.1.3.2) in serum, with use of monospecific antisera raised in rabbits against highly purified acid phosphatase from human prostates. The antiserum did not cross react with partly purified acid phosphatases from human spleen, erythrocytes, or synovial tissues. /sup 125/I-labeled acid phosphatase was prepared by a Chloramine T method, and the bound and free antigen was separated in the assay by use of anti-rabbit gamma-globulin raised in sheep. Uniform low nonspecific binding of the (/sup 125/I)acid phosphatase was achieved by using acid-phosphatase-free serum to prepare standard curves and diluted samples of serum with high acid phosphatase activities. Concentrations of immunoreactive acid phosphatase in the serum of healthy men ranged from <1 to 10 ..mu..g/liter and for 12 patients with advanced prostatic carcinoma between 100 and 500 ..mu..g/liter. The concentrations of the enzyme in sera of patients with benign prostatic hyperplasia were very similar to those in sera of the reference group.

  11. Topical disposition of two strengths of a 125I-rhEGF jelly in rat skin wounds.

    Science.gov (United States)

    Duconge, J; Prats, P A; Valenzuela, C; Aguilera, A; Rojas, I; Becquer, M A; Alvarez, D; Estrada, L; Alfonso-Ortíz, S; Hardy-Rando, E; García-Pulpeiro, O; Fernández-Sánchez, E

    2004-07-01

    Growth factors have proved to be an effective therapeutic strategy. However, some controversies have arisen concerning their efficacy in topical wound treatments. Stabilization of epidermal growth factors at the wound site and long-lasting receptor occupancy are important factors for wound repair. This study evaluated the cumulative profiles of two jellies containing 10 or 20 microg of 125I-rhEGF per gram of jelly, in a rat full-thickness skin lesion model. The prolonged time-courses at the wound sites for both strengths compared with saline solutions previously evaluated using a similar skin lesion model are reported. It seems that these two topical formulations that provide more sustained amounts of 125I-rhEGF over the period of sampling, would probably achieve the required wound healing response in terms of cell proliferation, collagen deposition and protein synthesis. Further studies need to be developed in order to elucidate whether such an in vivo disposition pattern is consistent with an earlier and stronger promotion of wound healing events.

  12. Synthesis and biological evaluation of {sup 125}I-erythropoietin as a potential radiopharmaceutical agent for tumours

    Energy Technology Data Exchange (ETDEWEB)

    Clemente, Goncalo dos Santos, E-mail: goncaloclemente@uc.pt [University of Coimbra (Portugal). Inst. of Nuclear Sciences Applied to Health; Duarte, Vera Lucia Serra [Polytechnical Institute of Lisbon (Portugal). Higher School of Health Technology

    2011-01-15

    Erythropoietin (EPO) is a glycoprotein hormone responsible for regulating erythropoiesis. Expression of EPO and EPO receptors (EPOr) has recently been demonstrated in some neoplastic cell lines and tumours, suggesting a potential new target for therapy. In this work, EPO was labeled with iodine-125 using the lactoperoxidase method, known to prevent damage to protein during radioiodination, and labeling conditions were optimized. In vitro stability studies have shown that {sup 125}I-EPO is radiochemically stable for 20 days after radiolabeling. In vitro cell binding studies have demonstrated very low binding (<2%) of EPO to normal and neoplastic cell lines tested. As expected, the biodistribution in healthy mice exhibited comparatively high rates of fixation in the organs of the excretory system. Thyroid also proved to be a critical organ which may indicate in vivo dissociation of {sup 125}I-EPO. In mice with induced melanoma, only a residual fixation in the tumour was evident. Further studies are warranted on other tumoral cell lines to better understand the binding process and internalization into cells. Studies on EPO labeled with carbon-11 could be valuable, since there is a greater chance of preserving the biological activity of the protein using this method. (author)

  13. A sup 125 I-radioimmunoassay for measuring androstenedione in serum and in blood-spot samples from neonates

    Energy Technology Data Exchange (ETDEWEB)

    Thomson, S.; Wallace, A.M.; Cook, B. (Stobhill Hospital, Glasgow (England))

    1989-08-01

    We developed a radioimmunoassay with a gamma-emitting radioligand to measure androstenedione in human serum and in dried blood-spot samples from newborns. Antisera were raised in rabbits against androstenedione linked to bovine serum albumin at positions 3, 6, or 11 on the steroid nucleus. Radioligands were prepared by linking ({sup 125}I)iodohistamine at positions 3, 6, or 11. Linkages were through either carboxymethyloxime or hemisuccinate bridges. All label and antibody combinations were examined, and the most sensitive and specific combination (antiserum raised against androstenedione-3-carboxymethyloxime-bovine serum albumin with an androstenedione-carboxymethyloxime-({sup 125}I)iodohistamine label) was selected for full evaluation. We report the performance of these selected reagents in an immunoassay for androstenedione in both serum and dried blood-spot samples from neonates. We measured concentrations of androstenedione in serum under normal and pathological conditions such as congenital adrenal hyperplasia and polycystic ovarian disease. Diurnal variation in normal men was observed. Androstenedione was measured in blood spots from neonates born at term or prematurely, with respiratory distress syndrome, or with congenital adrenal hyperplasia.

  14. ET-22CONVECTION-ENHANCED DELIVERY OF THE AUGER-ELECTRON-EMITTER 125I-UdR: A HIGHLY EFFICIENT THERAPY IN AN ORTHOTOPIC GLIOBLASTOMA XENOGRAFT MODEL

    OpenAIRE

    Halle, Bo; Thisgaard, Helge; Aaberg-Jessen, Charlotte; Olsen, Birgitte; Dam, Johan; Langkjær, Niels; Munthe, Sune; Någren, Kjell; Høilund-Carlsen, Poul Flemming; Kristensen, Bjarne

    2014-01-01

    BACKGROUND: Glioblastomas (GBMs), the most common and malignant primary brain tumors, always recur after standard treatment. In order to develop more efficient therapies, we tested a novel therapeutic approach using the radioactive Auger-electron-emitter (AEE) [125I]5-Iodo-2'-deoxyuridine (125I-UdR). This drug incorporates into DNA of dividing cells and upon decay emission of Auger-electrons causes clusters of double strand breaks leading to cell death. METHODS: In vitro, cells from two GBM s...

  15. Preparation of (125)I-ricin suitable as a probe for the autoradiographic localization of toxin binding sites

    Energy Technology Data Exchange (ETDEWEB)

    Doebler, J.A.; Mayer, T.W.; Traub, R.K.; Broomfield, C.A.; Calamaio, C.A.

    1993-05-13

    The long term objectives of this research are to identify cellular binding sites for ricin and examine its organ distribution in mice following aerosol inhalation exposure. Preliminary studies relating to the synthesis and evaluation of (125 I)-ricin as an autoradiographic probe have been conducted. Non-radioactive (I)-ricin prepared using the Iodogen method was found to be non-toxic both in vivo and in vitro. Lactose was then added to the Iodogen reaction medium to block galactose-binding site associated tyrosines in an attempt to retain toxicity. However, this did not prevent iodination-induced loss of biological potency. We then switched to the lactoperoxidase method of iodination, which yielded an (I)-ricin preparation with toxicity comparable to that of native toxin.

  16. p-( sup 125 I)iodoclonidine, a novel radiolabeled agonist for studying central alpha 2-adrenergic receptors

    Energy Technology Data Exchange (ETDEWEB)

    Baron, B.M.; Siegel, B.W. (Merrell Dow Research Institute, Cincinnati, OH (USA))

    1990-09-01

    Unlabeled p-iodoclonidine was efficacious in attenuating forskolin-stimulated cAMP accumulation in SK-N-SH neuroblastoma cells. Maximal attenuation was 76 +/- 3%, with an EC50 of 347 +/- 60 nM. Comparable values of epinephrine were 72 +/- 3% and 122 +/- 22 nM. Responses to both agonists were abolished by 10 microM phentolamine. Therefore, p-iodoclonidine is an agonist in a cell culture model system of the neuronal alpha 2-adrenergic receptor. p-(125I)Iodoclonidine binding to membranes were measured using various regions of the rat brain. The agonist labeled a single population of sites present on cerebral cortical membranes, which was saturable (Bmax = 230 fmol/mg of protein) and possessed high affinity for the ligand (Kd = 0.6 nM). Binding was largely specific (93% at 0.6 nM). A variety of alpha 2-adrenergic agonists and antagonists were shown to compete for the binding of the radioligand. The binding of p-(125I)iodoclonidine was much less sensitive to agents that interact with alpha 1-adrenergic, serotonergic, and dopaminergic receptors. Approximately 65% of the binding was sensitive to guanine nucleotides. Association kinetics using 0.4 nM radioligand were biphasic (37% associate rapidly, with kobs = 0.96 min-1, with the remainder binding more slowly, with kobs = 0.031 min-1) and reached a plateau by 90 min at 25 degrees. Dissociation kinetics were also biphasic, with 30% of the binding dissociating rapidly (k1 = 0.32 min-1) and the remainder dissociating 50-fold more slowly (k2 = 0.006 min-1). Agonist binding is, therefore, uniquely complex and probably reflects the conformational changes that accompany receptor activation.

  17. Comparative cost-effectiveness of focal and total salvage 125I brachytherapy for recurrent prostate cancer after primary radiotherapy

    Science.gov (United States)

    Piena, Marjanne A.; Steuten, Lotte M.G.; van der Voort van Zyp, Jochem R.N.; Moerland, Marinus A.; van Vulpen, Marco

    2016-01-01

    Purpose Focal salvage (FS) iodine 125 (125I) brachytherapy could be an effective treatment for locally radiorecurrent prostate cancer (PCa). Toxicity is often reduced compared to total salvage (TS) while cancer control can be maintained, which could increase cost-effectiveness. The current study estimates the incremental cost per quality-adjusted life year (QALY) of FS compared to TS. Material and methods A decision analytic Markov model was developed, which compares costs and QALYs associated with FS and TS. A 3-year time horizon was adopted with six month cycles, with a hospital perspective on costs. Probabilities for genitourinary (GU) and gastrointestinal (GI) toxicity and their impact on health-related quality of life (SF-36) were derived from clinical studies in the University Medical Center Utrecht (UMCU). Probabilistic sensitivity analysis, using 10,000 Monte Carlo simulations, was performed to quantify the joint decision uncertainty up to the recommended maximum willingness-to-pay threshold of €80,000/QALY. Results Focal salvage dominates TS as it results in less severe toxicity and lower treatment costs. Decision uncertainty is small, with a 97-100% probability for FS to be cost-effective compared to TS (€0-€80,000/QALY). Half of the difference in costs between FS and TS was explained by higher treatment costs of TS, the other half by higher incidence of severe toxicity. One-way sensitivity analyses show that model outcomes are most sensitive to utilities and probabilities for severe toxicity. Conclusions Focal salvage 125I brachytherapy dominates TS, as it has lower treatment costs and leads to less toxicity in our center. Larger comparative studies with longer follow-up are necessary to assess the exact influence on (biochemical disease free) survival and toxicity. PMID:28115953

  18. Preferential reduction of binding of sup 125 I-iodopindolol to beta-1 adrenoceptors in the amygdala of rat after antidepressant treatments

    Energy Technology Data Exchange (ETDEWEB)

    Ordway, G.A.; Gambarana, C.; Tejani-Butt, S.M.; Areso, P.; Hauptmann, M.; Frazer, A. (Veterans Affairs Medical Center, Philadelphia, PA (USA))

    1991-05-01

    This study utilized quantitative receptor autoradiography to examine the effects of repeated administration of antidepressants to rats on the binding of the beta adrenoceptor antagonist, {sup 125}I-iodopindolol ({sup 125}I-IPIN) to either beta-1 or beta-2 adrenoceptors in various regions of brain. Antidepressants were selected to represent various chemical and pharmacological classes including tricyclic compounds (desipramine and protriptyline), monoamine oxidase inhibitors (clorgyline, phenelzine and tranylcypromine), atypical antidepressants (mianserin and trazodone) and selective inhibitors of the uptake of serotonin (citalopram and sertraline). Additionally, rats were treated with various psychotropic drugs that lack antidepressant efficacy (cocaine, deprenyl, diazepam and haloperidol). Repeated treatment of rats with desipramine, protriptyline, clorgyline, phenelzine, tranylcypromine or mianserin reduced the binding of {sup 125}I-IPIN to beta-1 adrenoceptors in many brain areas. Only in the basolateral and lateral nuclei of the amygdala did all six of these antidepressants significantly reduce {sup 125}I-IPIN binding to beta-1 adrenoceptors. In these amygdaloid nuclei, the magnitude of the reduction in the binding of {sup 125}I-IPIN caused by each of these drugs was comparable to or greater than the reduction in binding produced in any other region of brain. Reductions of binding of {sup 125}I-IPIN after antidepressant treatments were not consistently observed in the cortex, the area of brain examined most often in homogenate binding studies. Only the monoamine oxidase inhibitors caused reductions in the binding of {sup 125}I-IPIN to beta-2 adrenoceptors, and this effect was generally localized to the amygdala and hypothalamus.

  19. Metabolic and kinetic considerations in the use of (/sup 125/I)HIPDM for quantitative measurement of regional cerebral blood flow

    Energy Technology Data Exchange (ETDEWEB)

    Lucignani, G.; Nehlig, A.; Blasberg, R.; Patlak, C.S.; Anderson, L.; Fieschi, C.; Fazio, F.; Sokoloff, L.

    1985-03-01

    The metabolic degradation and the kinetics of the cerebral uptake of N,N,N'-trimethyl-N'-(2-hydroxy-3-methyl-5-(/sup 125/I)iodobenzyl)-1, 3-propanediamine ((/sup 125/I)HIPDM) have been studied in conscious, adult male Sprague-Dawley rats to determine its suitability as a tracer for the quantitative measurement of regional CBF (rCBF). rCBF was calculated by the indicator fractionation and the tissue equilibration methods in experiments of different durations up to 1 h. The values of rCBF obtained with (/sup 125/I)HIPDM were compared with those obtained in concurrent measurements with (/sup 14/C)iodoantipyrine in the same animals. Results of the experiments demonstrate that (/sup 125/I)HIPDM is an inadequate tracer for use with the indicator fractionation method and that any method that employs (/sup 125/I)HIPDM for the determination of rCBF must take into account its metabolic degradation, diffusion limitations, and bidirectional flux across the blood-brain barrier. With the tissue equilibration method, consistent determinations of rCBF may be possible with (/sup 125/I)HIPDM by measurement of the time course of its concentration in arterial blood, corrected for the presence of /sup 125/I-labeled metabolic products, and its concentration in the brain at any time up to 1 h after its administration. The method may be adapted to measure rCBF in humans by means of single-photon emission tomography with (/sup 123/I)HIPDM.

  20. Monte Carlo calculation of dosimetric parameters of a {sup 125}I brachytherapy seed encapsulation with biocompatible polymer and a ceramic matrix as radiographic marker

    Energy Technology Data Exchange (ETDEWEB)

    Reis, Lucas P.; Santos, Adriano M.; Grynberg, Suely E., E-mail: lpr@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil). Lab. de Dosimetria e Simulacao Computacional; Facure, Alessandro, E-mail: facure@cnen.gov.b [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil)

    2011-07-01

    For prostate cancer treatments, there is an increasing interest in the permanent radioactive seeds implant technique. Currently, in Brazil, the seeds are imported at high prices, which prohibit their use in public hospitals. One of the seed models that have been developed at CDTN has a ceramic matrix as a radioisotope carrier and a radiographic marker; the seed is encapsulated with biocompatible polymer. In this work, Monte Carlo simulations were performed in order to assess the dose distributions generated by the prototype seed model. The obtained data was assessed as described in the TG-43U1 report by the AAPM. The dosimetric parameters dose rate constant, {Lambda}, radial dose function, g{sub L}(r), and anisotropy function, F(r,{theta}), were derived from simulations using the MCNP5 code. The function g(r) shows that the seed has a lower decrease in dose rate on its transverse axis when compared to the 6711 model (one of the most used seeds in permanent prostate implants). F(r,{theta}) shows that CDTN's seed anisotropy curves are smoother than the 6711 model curves for {theta}{<=}20 deg and 0.25{<=}r{<=}1 cm. As well, the {Lambda} value is 15% lower than the {Lambda} value of 6711. The results show that CDTN's seed model can deposit a more isotropic dose. Because of the model's characteristics, the seeds can be impregnated with iodine of lower specific activity which would help reducing costs. (author)

  1. Monitoring intervals for measurement of the radionuclides {sup 125} I and {sup 129I} in thyroid glands; Intervalos de monitoreo, para la medicion en la glandula tiroides de los radionucleidos {sup 125}I y {sup 1} {sup 29}I

    Energy Technology Data Exchange (ETDEWEB)

    Simanca, Yoan Yera; Bejerano, Gladys M. Lopez, E-mail: yoan@cphr.edu.cu, E-mail: gladys@cphr.edu.cu [Centro de Proteccion e Higiene de las Radiaciones (CPHR), Cuidad de la Habana (Cuba)

    2013-07-01

    This work shows the monitoring interval, which can be implemented in the Laboratorio de Contaminacion Interna del Centro de Proteccion e Higiene de las Radiaciones, for direct measurement in the thyroid gland of radionuclides {sup 125}I and {sup 129}I . Were used two measuring systems, one employing a scintillating detector and the other detector Phoswich. Both detectors were placed inside a depth camera, 2.5 x 2.5 x 2.5m of dimension covered with 15 cm of steel, 3 mm lead, 1.8 mm tin and 1.5 mm of copper. Was calculated for each system, the minimum detectable activity, and based on this, the monitoring interval is determined. Was obtained, for {sup 125}, all tested intervals, 120, 90,60,30 , 14, and 7 days may be implemented with both systems. In the case of the radionuclide {sup 129} I, with the installation of scintillating detector can only be implemented the intervals 120, 90, and 60 days , and for installation with Phoswich, all evaluated.

  2. Clinical study of hospital infections in patients after implantation of permanent cardiac pacemaker%心脏永久置入起搏器患者医院感染的临床研究

    Institute of Scientific and Technical Information of China (English)

    黄荫浩; 顾青青; 陆齐; 黄荣; 吴翔

    2015-01-01

    OBJECTIVE To investigate the hospital infection and pathogenic characteristics of patients undergoing implantation of permanent cardiac pacemaker so as to provide certain clinical guidance .METHODS Retrospective a‐nalysis was conducted on clinical data of 240 patients undergoing permanent pacemaker implantation from Jan . 2011 to Jun .2014 .T he infection incidence ,clinical manifestations ,pathogenic characteristics and treatment meth‐ods were statistically summarized ,and the single factor analysis of variance and the multiple logistic regression a‐nalysis were used to analyze risk factors of infections in patients with permanent cardiac pacemaker .RESULTS A‐mong the 240 patients with permanent cardiac pacemaker ,pacemaker pocket infection occurred in 6 cases ,the in‐fection rate was 2 .5% ,including 4 cases (66 .7% ) with infections occurring at the first time of implantation and 2 cases (33 .3% ) after the replacement of pacemaker .In the 6 patients ,4 cases had the secretion culture positive for Staphylococcus epidermidis infection and the sensitivity to vancomycin was 100 .0% .Advanced age ,operation time ≥ 2 h ,operation frequency ≥ 2 times ,and pocket hematoma were risk factors of infection in patients with permanent pacemaker .CONCLUSION The main pathogen for infection in patients with permanent cardiac pacemak‐er was S .epidermidis ,sensitive to vancomycin .It is recommended to conduct reasonable treatment according to the risk factors of the patients .%目的:探讨心脏永久置入起搏器患者的医院感染与病原学特征,旨在为临床提供一定的指导。方法回顾性分析2011年1月-2014年6月240例实施永久起搏器置入术患者的临床资料,统计其感染的发生、临床表现、病原学特征、治疗方法,并采用单因素方差分析和多因素 logistic回归分析,分析心脏永久置入起搏器装置患者感染的危险因素。结果240例心脏永久置

  3. Biodistribution of [sup 125]I labeled monoclonal antibody against gamma seminoprotein in the nude mice bearing human benign prostatic hyperplasia xenografts

    Energy Technology Data Exchange (ETDEWEB)

    Fujino, Awato (Kitasato Univ., Sagamihara, Kanagawa (Japan). School of Medicine)

    1993-07-01

    The biodistribution of [sup 125]I labeled monoclonal antibody against gamma seminoprotein ([gamma]-Sm) in the nude mice bearing human benign prostatic hyperplasia xenograft was evaluated by whole body autoradiography and by counting of radioactivity in organs. The monoclonal antibody (murine Ig G[sub 1], K) to [gamma]-Sm which was established in this institute and its F(ab')[sub 2] fragment were radioiodinated using Iodogen method. The autoradiograms demonstrated specific uptake of [sup 125]I-intact Ig G as well as [sup 125]I-F(ab')[sub 2] within the prostatic adenoma xenografts 4 days after intravenous administrations. Radioactivity in the xenograft was relatively higher than those in the liver, kidney or lung. These results suggest that radio-labeled monoclonal antibody against [gamma]-Sm might be applicable for radioimmunodetection of prostatic tumors which produce [gamma]-Sm. (author).

  4. Direct demonstration of insulin receptor internalization. A quantitative electron microscopic study of covalently bound /sup 125/I-photoreactive insulin incubated with isolated hepatocytes

    Energy Technology Data Exchange (ETDEWEB)

    Gorden, P.; Carpentier, J.L.; Moule, M.L.; Yip, C.C.; Orci, L.

    1982-07-01

    When /sup 125/I-insulin is incubated with isolated rodent hepatocytes at 37 degrees C, the ligand initially binds to the plasma membrane of the cell and is subsequently internalized by adsorptive endocytosis. To confirm directly that the insulin receptor is internalized with the ligand, we covalently linked photoreactive /sup 125/I-N sigma B29 (azidobenzoyl) insulin to its specific hepatocyte receptor and followed its fate by quantitative electron microscopic autoradiography. We found that the covalently linked photoreactive insulin is internalized by the cell in fashion analogous to the internalization of ordinary /sup 125/I-insulin, indicating that, at least under these conditions, the insulin receptor is internalized with the ligand.

  5. {sup 125}I-BMIPP and {sup 18}F-FDG uptake in a transgenic mouse model of stunned myocardium

    Energy Technology Data Exchange (ETDEWEB)

    Verberne, Hein J.; Sloof, Gerrit W.; Eck-Smit, Berthe L.F. van [Department of Nuclear Medicine, Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam (Netherlands); Beets, Arnold L.; Knapp, Furn (Russ) F. [Nuclear Medicine Program, Oak Ridge National Laboratory, Oak Ridge, Tennessee (United States); Murphy, Anne M. [Department of Pediatrics and Institute of Molecular Cardiobiology, Johns Hopkins University School of Medicine, Baltimore, Maryland (United States)

    2003-03-01

    Reported metabolic patterns in myocardial stunning are not uniform. We investigated relative myocardial perfusion, glucose and fatty acid uptake using a technetium-99 hexakis-2-methoxyisobutyl-isonitrile (MIBI), fluorine-18 2-fluoro-2-deoxyglucose (FDG) and iodine-125 15-(p-iodo-phenyl)-3(R,S)-methylpentadecanoic acid (BMIPP) mixture, in a recently developed transgenic (TR) mouse model which mimics stunned myocardium. Twenty-seven mice - 14 TR and 13 age-matched wild type controls (C) - were divided into four groups: TR-fed, TR-fasted, C-fed and C-fasted. Animals were sacrificed 2 h after injection, tissue samples counted and percent-injected dose/gram tissue (% id/g) calculated for each radioisotope. Tissues were also Folch extracted and {sup 125}I incorporation into the various lipid pools (TG, triglycerides; DG, diglycerides; FFA, free fatty acids; PL, phospholipids) was determined by thin-layer chromatography (TLC). The pooled data for each of the four groups (TR-fed vs C-fed and TR-fed vs C-fasted) showed no differences in myocardial blood flow (% MIBI id/g), glucose uptake (% FDG id/g) or fatty acid uptake (% BMIPP id/g). Only minor differences were observed in the incorporation of {sup 125}I-BMIPP into the myocardial TG, DG, FFA and PL lipid pools. However, significantly decreased myocardial FDG uptake was observed in a subset of fasted mice - four out of ten TR-fasted mice (3.4% vs 20.5% id/g) and three out of nine C-fasted mice (5.5% vs 30.6% id/g). The transgenic mouse model of stunned myocardium shows normal myocardial perfusion and overall intact myocardial glucose and myocardial fatty acid uptake as determined with clinically applicable radiolabelled analogues. These data are in line with the hypothesis that the contractile inefficiency in stunned myocardium is not linked to metabolic alterations but is associated with an insufficient chemical to mechanical energy coupling. (orig.)

  6. Synthesis of 125I Labeled Estradiol-17-Hemisuccinate and Its Binding Study to Estrogen Receptors Using Scintillation Proximity Assay Method

    Directory of Open Access Journals (Sweden)

    Y. Susilo

    2012-12-01

    Full Text Available Research was carried out to obtain a selective ligand which strongly bind to estrogen receptors through determination of binding affinity of estradiol-17β-hemisuccinate. Selectivity of these compounds for estrogen receptor was studied using Scintillation Proximity Assay (SPA method. Primary reagents required in the SPA method including radioligand and receptor, the former was obtained by labeling of estradiol-17β-hemisuccinate with 125I, while MCF7 was used as the receptor. The labeling process was performed by indirect method via two-stage reaction. In this procedure, first step was activation of estradiol-17β-hemisuccinate using isobutylchloroformate and tributylamine as a catalist, while labeling of histamine with 125I was carried out using chloramin-T method to produce 125I-histamine. The second stage was conjugation of activated estradiol-17β-hemisuccinate with 125I-histamine. The product of estradiol-17β-hemisuccinate labeled 125I was extracted using toluene. Furtherly, the organic layer was purified by TLC system. Characterization of estradiol-17β-hemisuccinate labeled 125I from this solvent extraction was carried out by determining its radiochemical purity and the result was obtained using paper electrophoresis and TLC were 79.8% and 84.4% respectively. Radiochemical purity could be increased when purification step was repeated using TLC system, the result showed up to 97.8%. Determination of binding affinity by the SPA method was carried out using MCF7 cell lines which express estrogen receptors showed the value of Kd at 7.192 x 10-3 nM and maximum binding at 336.1 nM. This low value of Kd indicated that binding affinity of estradiol-17β-hemisuccinate was high or strongly binds to estrogen recepto

  7. High affinity binding of /sup 125/I-labeled mouse interferon to a specific cell surface receptor. II. Analysis of binding properties

    Energy Technology Data Exchange (ETDEWEB)

    Aguet, M.; Blanchard, B.

    1981-12-01

    Direct ligand-binding studies with highly purified /sup 125/I-labeled virus-induced mouse interferon on mouse lymphoma L 1210 cells revealed a direct correlation of specific high-affinity binding with the biologic response to interferon. Neutralization of the antiviral effect by anti-interferon gamma globulin occurred at the same antibody concentration as the inhibition of specific binding. These results suggest that specific high-affinity binding of /sup 125/I-interferon occurred at a biologically functional interferon receptor. Competitive inhibition experiments using /sup 125/I- and /sup 127/I-labeled interferon provided strong evidence that the fraction of /sup 125/I-interferon inactivated upon labeling did not bind specifically. Scatchard analysis of the binding data yielded linear plots and thus suggested that interferon binds to homogeneous noncooperative receptor sites. In contrast to a characteristic property of several peptide hormone systems, binding of /sup 125/I-interferon to its specific receptor did not induce subsequent ligand degradation. At 37/sup o/ bound interferon was rapidly released in a biologically active form without evidence for molecular degradation. The expression of interferon receptors was not modified by treatment with interferon. Trypsin treatment of target cells and inhibition of protein synthesis abolished the specific binding of /sup 125/I-interferon. Three major molecular weight species of Newcastle disease virus-induced mouse C 243 cell interferon were isolated, separated, and identified as mouse ..cap alpha.. and ..beta.. interferons. These interferons were shown to inhibit competitively the specific binding of the highly purified labeled starting material thus providing evidence for a common receptor site for mouse interferon.

  8. Calculation of excitation functions of proton, alpha and deuteron induced reactions for production of medical radioisotopes {sup 122–125}I

    Energy Technology Data Exchange (ETDEWEB)

    Artun, Ozan, E-mail: ozanartun@yahoo.com; Aytekin, Hüseyin, E-mail: huseyinaytekin@gmail.com

    2015-02-15

    In this work, the excitation functions for production of medical radioisotopes {sup 122–125}I with proton, alpha, and deuteron induced reactions were calculated by two different level density models. For the nuclear model calculations, the Talys 1.6 code were used, which is the latest version of Talys code series. Calculations of excitation functions for production of the {sup 122–125}I isotopes were carried out by using the generalized superfluid model (GSM) and Fermi-gas model (FGM). The results have shown that generalized superfluid model is more successful than Fermi-gas model in explaining the experimental results.

  9. Y-configured metallic stent combined with (125)I seed strands cavity brachytherapy for a patient with type IV Klatskin tumor.

    Science.gov (United States)

    Dechao, Jiao; Han, Xinwei; Yanli, Wang; Zhen, Li

    2016-08-01

    We report a case in an inoperable patient with type IV Klatskin tumor treated by the use of a novel, two piece, Y-configured self-expandable metallic stent (SEMS) combined with two (125)I seed strands via bilateral approach. The placement of the Y-shaped SEMS was successful and resulted in adequate biliary drainage. After 2 months of intraluminal brachytherapy (ILBT), both (125)I seed strands and temporary drainage catheter were removed after patency of the expanded stents was confirmed by the cholangiogram. This technique was feasible and could be considered for the treatment of patients with Bismuth type IV Klatskin tumors.

  10. Y-configured metallic stent combined with 125I seed strands cavity brachytherapy for a patient with type IV Klatskin tumor

    Science.gov (United States)

    Dechao, Jiao; Yanli, Wang; Zhen, Li

    2016-01-01

    We report a case in an inoperable patient with type IV Klatskin tumor treated by the use of a novel, two piece, Y-configured self-expandable metallic stent (SEMS) combined with two 125I seed strands via bilateral approach. The placement of the Y-shaped SEMS was successful and resulted in adequate biliary drainage. After 2 months of intraluminal brachytherapy (ILBT), both 125I seed strands and temporary drainage catheter were removed after patency of the expanded stents was confirmed by the cholangiogram. This technique was feasible and could be considered for the treatment of patients with Bismuth type IV Klatskin tumors. PMID:27648091

  11. New technique using ( sup 125 I)labeled rose bengal for the quantification in blood samples of pipecuronium bromide, a muscle relaxant drug

    Energy Technology Data Exchange (ETDEWEB)

    Schopfer, C.; Benakis, A.; Pittet, J.-F.; Tassonyi, E. (Centre Medical Universitaire, Geneva (Switzerland))

    1991-05-01

    A new technique involving the use of ({sup 125}I)labeled rose bengal for the quantification of pipecuronium bromide (a muscle relaxant drug) is presented. This technique, which is based on the ability of rose bengal to react with pipecuronium and then form a complex which can be extracted into an organic solvent, involves two steps: the purification and labeling of rose bengal with {sup 125}I, and the quantification of pipecuronium. The specific activity of the compound (106 {mu}Ci/mg) allows for the quantification of pipecuronium in biological samples at concentrations as low as 5 ng/ml. (author).

  12. Autoradiographic study of dopamine transporter in rat Model of Parkinson' s disease with 125I-β-CIT

    Institute of Scientific and Technical Information of China (English)

    Liu Zhenguo; Chen Shengdi; Shum Wenshan

    2000-01-01

    Objective To evaluate the value of iaaging for dopamine transpter(DAT) wi th 125I- β-CIT. Methods The partial and complete lesioned rat models of hemiparkinsonism were rendered with 6- hydroxy-dopamine (6-OHDA). Each rat was injected intravenously with 1251-β-CIT containing 40 μ Ci. Coronal t issue sections were imaged by autoradiography. The levets of dopamine (DA)and its metabolites were measured by high performance 1iquid choromatography and electro-chemical detection (HPLC-ECD). The t yros i nc hydroxylase(Tll)-positive cells and fibres in substantia nigra and striatum of the rats were observed by immunohistochemieal staining. Results The radioactivities in the lesioned striatum of both partial and complete lesioned hemiparkinsonian rats were 2.67±0.25 and O. 98±0.29 respectively , and were singificantly decreased by.18% and 72% respectively, as compared with those of unlesioned side. The levels of DA in the lesioned striatum of partial and complete lesioned models were decreased by 39% and 98% respectively. The loss of TH-positive eells and fibres in the substantia nigra and striatum was found in the lesioned striatum of both partial and complete-lesioned models. Conclusion The imaging study of DAT may be helpful for the early diagnosis of Parkinson's disease and for the monitor of the progression of this discaose;.

  13. Concanavalin A-mediated cell agglutinability induced by Vaccinia virions. [Uv radiation, /sup 125/I tracer technique

    Energy Technology Data Exchange (ETDEWEB)

    Mbuy, G.; Bubel, H.C.

    1978-12-01

    The induction of enhanced concanavalin A (Con A)-mediated cellular agglutinability by purified vaccinia virus was examined quantitatively. Increased HEp-2 cell agglutinability by the lectin occurred within the first hour of infection and persisted without further change throughout the virus infectious cycle. Ultraviolet, but not heat-inactivated, virus was as effective as infectious virus in causing increased Con A agglutinability. Inhibition of viral and host cell protein synthesis by Streptovitacin A failed to alter the lectin response to vaccinia virus infection. Fluorescein-labeled Con A was observed to form clusters and large fluorescent patches on the infected cell surface during the earliest stage of infection. Studies with /sup 125/I-labeled Con A revealed an early but minimal increase in lectin binding to infected cells. After the first hour of infection, no further increase in Con A binding was observed. When cells were exposed to purified vaccinia virus surface tubules increased Con A agglutinability comparable to that obtained with native virus was demonstrated. Con A-mediated agglutinability of cells was temperature-dependent and displayed a higher temperature transition in infected cells. These data suggest that upon contact with the host cell, vaccinia virions or surface tubules induce alterations in the plasma membrane which are reflected in an enhanced agglutinability by Con A.

  14. A rapid radioimmunoassay using /sup 125/I-labeled staphylococcal protein A for antibody to varicella-zoster virus

    Energy Technology Data Exchange (ETDEWEB)

    Richman, D.D.; Cleveland, P.H.; Oxman, M.N.; Zaia, J.A.

    1981-05-01

    A sensitive radioimmunoassay for serum antibody to varicella-zoster virus is described; it uses 125I-labeled staphylococcal protein A and a specially designed immunofiltration apparatus. The assay accurately distinguishes between individuals who are susceptible and those who are immune to infection with varicella-zoster virus. In addition, it can detect passive antibody in recipients of varicella-zoster immune globulin. This radioimmunoassay also detects the heterologous antibody responses that occasionally occur in patients infected with herpes simplex virus, which also have been detected by other antibody assays. The particular advantages of this assay are the use of noninfectious reagents, the speed of execution (less than 3 hr), the requirement for only small quantities of serum (30 microliters), the objectivity of end-point determination, and the capability of screening large numbers of sera. Consequently, this radioimmunoassay is especially useful for the rapid identification of susceptible individuals, which is essential for the appropriate management of patients and hospital personnel after exposure to varicella.

  15. Erythropoietin messenger RNA levels in developing mice and transfer of /sup 125/I-erythropoietin by the placenta

    Energy Technology Data Exchange (ETDEWEB)

    Koury, M.J.; Bondurant, M.C.; Graber, S.E.; Sawyer, S.T.

    1988-07-01

    Erythropoietin (EP) mRNA was measured in normal and anemic mice during fetal and postnatal development. Normal fetal livers at 14 d of gestation contained a low level of EP mRNA. By day 19 of gestation, no EP mRNA was detected in normal or anemic fetal livers or normal fetal kidneys, but anemic fetal kidneys had low levels of EP mRNA. Newborn through adult stage mice responded to anemia by accumulating renal and hepatic EP mRNA. However, total liver EP mRNA was considerably less than that of the kidneys. Juvenile animals, 1-4 wk old, were hyperresponsive to anemia in that they produced more EP mRNA than adults. Moreover, nonanemic juveniles had readily measured renal EP mRNA, whereas the adult level was at the lower limit of detection. Because of the very low level of fetal EP mRNA, placental transfer of EP was evaluated. When administered to the pregnant mouse, /sup 125/I-EP was transferred in significant amounts to the fetuses. These results indicate that in mice the kidney is the main organ of EP production at all stages of postnatal development and that adult kidney may also play some role in providing EP for fetal erythropoiesis via placental transfer of maternal hormone.

  16. Feasibility and impact of the measurement of extracellular fluid volume simultaneous with GFR by 125I-iothalamate.

    Science.gov (United States)

    Visser, Folkert W; Muntinga, Jaap H J; Dierckx, Rudi A; Navis, Gerjan

    2008-09-01

    The feasibility, validity, and possible applications of the assessment of extracellular fluid volume (ECFV) simultaneous with glomerular filtration rate (GFR) were assessed in a series of validation studies using the constant infusion method of (125)I-iothalamate (IOT). In 48 subjects with a broad range of GFR, distribution volume (V(d)) of IOT corresponded well with V(d) bromide (16.71 +/- 3.0 and 16.73 +/- 3.2 l, respectively, not significant), with a strong correlation (r = 0.933, P IOT during strictly standardized (50 mmol Na(+)/d) sodium intake. An increase in dietary sodium intake (200 mmol Na(+)/d) induced a corresponding rise in V(d) IOT of 1.11 +/- 1.5 l (P IOT. After appropriate validation, also other GFR tracers could be used for such a simultaneous estimation, providing a valuable resource of data on ECFV in renal studies and, moreover, allowing GFR to be indexed to the body fluid compartment it clears: the ECFV.

  17. Relato de caso: implante transparietohepático de cateter de longa permanência para diálise Case report: transhepatic insertion of long-term dialysis catheter

    Directory of Open Access Journals (Sweden)

    Felipe Nasser

    2007-12-01

    Full Text Available O implante transhepático de cateteres de diálise de longa permanência é um procedimento de exceção, utilizado para obter um acesso em pacientes com oclusão de veias centrais de membros superiores e inferiores. O caso descrito relata um paciente jovem, com história de 15 anos de diálise, que foi submetido no passado a um transplante renal sem sucesso. Esse paciente encontrava-se em urgência dialítica e oclusão comprovada de veias centrais de membros superiores e de veias ilíacas. Foi realizado o implante do cateter de longa permanência pelo acesso transparietohepático sob anestesia geral. A ponta do cateter foi posicionada ao nível do átrio direito. A diálise foi realizada satisfatoriamente no mesmo dia.Transhepatic insertion of long-term dialysis catheter is an exception procedure used to obtain access in patients with central vein occlusion of lower and upper limbs. We report on a case of a young patient with history of dialysis for 15 years, who was submitted to an unsuccessful renal transplantation. This patient was in dialytic emergency and had confirmed occlusion of upper limb central veins and iliac veins. Transhepatic insertion of a long-term catheter was performed under general anesthesia. The catheter tip was placed at the level of the right atrium. Dialysis was satisfactorily performed on the same day.

  18. Internalization of the radioiodinated somatostatin analog [125I-Tyr3]octreotide by mouse and human pituitary tumor cells: increase by unlabeled octreotide

    NARCIS (Netherlands)

    L.J. Hofland (Leo); P.M. van Koetsveld (Peter); M. Waaijers (Marlijn); J. Zuyderwijk; W.A.P. Breeman (Wouter); S.W.J. Lamberts (Steven)

    1995-01-01

    textabstractRecently, we developed a technique that allows the in vivo visualization in man of somatostatin receptor-positive neuroendocrine tumors after i.v. injection of [125I-Tyr3]octreotide or [111In-DTPA-D-Phe1]octreotide. Radiotherapy of such tumors using somatost

  19. Evaluatie van de Coat-A-Count Neonatal T4 RIA en een vergelijking met de (125-I) Neonatal T4 RIA

    NARCIS (Netherlands)

    Elvers LH; Smit PJ; Loeber JG

    1984-01-01

    De Bijzondere Afd. Automatisering Serologisch Onderzoek maakt voor de screening op congenitale hypothyreoidie gebruik van de (125-I) Neonatal T4 RIA (LP) van Diagnostic Products Corporation (DPC). Vanaf maart 1984 zal deze kit echter niet meer geleverd worden. DPC heeft namelijk een nieuwe kit ge

  20. Tritiated-nicotine- and /sup 125/I-alpha-bungarotoxin-labeled nicotinic receptors in the interpeduncular nucleus of rats. II. Effects of habenular destruction

    Energy Technology Data Exchange (ETDEWEB)

    Clarke, P.B.; Hamill, G.S.; Nadi, N.S.; Jacobowitz, D.M.; Pert, A.

    1986-09-15

    The cholinergic innervation of the interpeduncular nucleus (IPN) is wholly extrinsic and is greatly attenuated by bilateral habenular destruction. We describe changes in the labeling of putative nicotinic receptors within this nucleus at 3, 5, or 11 days after bilateral habenular lesions. Adjacent tissue sections of the rat IPN were utilized for /sup 3/H-nicotine and /sup 125/I-alpha-bungarotoxin (/sup 125/I-BTX) receptor autoradiography. Compared to sham-operated controls, habenular destruction significantly reduced autoradiographic /sup 3/H-nicotine labeling in rostral (-25%), intermediate (-13%), and lateral subnuclei (-36%). Labeling in the central subnucleus was unchanged. Loss of labeling was maximal at the shortest survival time (3 days) and did not change thereafter. In order to establish whether this loss was due to a reduction in the number or the affinity of /sup 3/H-nicotine-binding sites, a membrane assay was performed on microdissected IPN tissue from rats that had received surgery 3 days previously. Bilateral habenular lesions produced a 35% reduction of high-affinity /sup 3/H-nicotine-binding sites, with no change in binding affinity. Bilateral habenular lesions reduced /sup 125/I-BTX labeling in the intermediate subnuclei, and a slight increase occurred in the rostral subnucleus. In the lateral subnuclei, /sup 125/I-BTX labeling was significantly reduced (27%) at 3 days but not at later survival times. In view of the known synaptic morphology of the habenulointerpeduncular tract, it is concluded that a subpopulation of /sup 3/H-nicotine binding sites within the IPN is located on afferent axons and/or terminals. This subpopulation, located within rostral, intermediate, and lateral subnuclei, may correspond to presynaptic nicotinic cholinergic receptors. Sites that bind /sup 125/I-BTX may include a presynaptic subpopulation located in the lateral and possibly the intermediate subnuclei.

  1. Long-term effects of permanent pacemaker implantation on tricuspid valve regurgitation%起搏器植入术后对三尖瓣反流的远期影响

    Institute of Scientific and Technical Information of China (English)

    任崇雷; 王瑶; 王嵘; 李伯君; 耿仁义; 高长青

    2012-01-01

    Objective To explore the long-term effects of permanent pacemaker implantation (PPI) on tricuspid valve regurgitation (TR) in Chinese patients so as to determine the incidence and related factors,evaluate its effects on heart structure and function and ascertain the exact mechanism of TR after PPI.Methods A total of 430 patients undergoing permanent pacemaker replacement at our hospital between January 2000 and June 2011 were recruited.The patients with isolated atrial lead implantation procedures,significant heart valve disease or chronic obstructive pulmonary disease were excluded. The data of 108 patients who had Doppler echocardiograms performed before the first pacemaker implantation procedure and this pacemaker replacement procedure were obtained and retrospectively analyzed. According to the post-implant grade of TR,the patients were divided into two groups:normal tricuspid ( n =79 ) and abnormal tricuspid(n =29 ). Their clinical characteristics and echocardiographic data between two groups were analyzed and compared.Results The mean follow-up time (from the first pacemaker implantation) was ( 13 ± 6) years( range:4 -34 ).Among 108 patients with initially normal tricuspid post-implant,29 patients (26.9% ) developed significant TR during the follow-up.In comparison to those in normal tricuspid group,the patients in abnormal tricuspid group had a longer time from the first pacemaker implantation ( ( 16 ± 7 )vs (12±5) years,P=0.003),more transtricuspid leads (1.31 ±0.66 vs 1.10 ±0.30,P=0.026),larger right atrial size ( (38 ±7) vs (35 ±4) mm,P =0.028) and higher prevalence of mild TR and mitral valve regurgitation (MR) pre-implantation(TR:21% vs 4%,P =0.015,MR:28% vs 5%,P=0.003).The size of right atrium,right ventricle and left atrium in abnormal tricuspid group were more than those in normal tricuspid group.The prevalence of significant MR post-implantation in abnormal tricuspid group was higher than that in normal tricuspid group.The ejection

  2. Current status of the gyro centrifugal blood pump--development of the permanently implantable centrifugal blood pump as a biventricular assist device (NEDO project).

    Science.gov (United States)

    Nosé, Yukihiko; Furukawa, Kojiro

    2004-10-01

    The New Energy and Industrial Technology Development Organization (NEDO) project was started in 1995. The goal is the development of a multipurpose, totally implantable biventricular assist device (BVAD) that can be used for any patient who suffers from severe heart failure. Our C1E3 (two-week pump) centrifugal pump, called the Gyro pump, has three design characteristics: a magnetic coupling and double pivot bearing system, an eccentric inlet port, and secondary vanes on the bottom of the impeller. The pump was miniaturized. The C1E3 evolved into the NEDO PI-601, a totally implantable centrifugal pump for BVAD. The current NEDO PI-710 pump (five-year pump) system includes a centrifugal pump with pivot bearings, a hydraulically-levitated impeller, an rpm-controlled miniaturized actuator (all-in-one actuator plus controller), an emergency clamp on the left outflow, and a Frank-Starling-type flow control. The final mass production model is now finalized, and the final animal study and two-year endurance studies are ongoing.

  3. Effect of improved TLD dosimetry on the determination of dose rate constants for {sup 125}I and {sup 103}Pd brachytherapy seeds

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, M., E-mail: manuel.rodriguez@rmp.uhn.ca [Carleton Laboratory for Radiotherapy Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada and Princess Margaret Hospital, Toronto, Ontario M5G 2M9 (Canada); Rogers, D. W. O. [Carleton Laboratory for Radiotherapy Physics, Carleton University, Ottawa, Ontario K1S 5B6 (Canada)

    2014-11-01

    Purpose: To more accurately account for the relative intrinsic energy dependence and relative absorbed-dose energy dependence of TLDs when used to measure dose rate constants (DRCs) for {sup 125}I and {sup 103}Pd brachytherapy seeds, to thereby establish revised “measured values” for all seeds and compare the revised values with Monte Carlo and consensus values. Methods: The relative absorbed-dose energy dependence, f{sup rel}, for TLDs and the phantom correction, P{sub phant}, are calculated for {sup 125}I and {sup 103}Pd seeds using the EGSnrc BrachyDose and DOSXYZnrc codes. The original energy dependence and phantom corrections applied to DRC measurements are replaced by calculated (f{sup rel}){sup −1} and P{sub phant} values for 24 different seed models. By comparing the modified measured DRCs to the MC values, an appropriate relative intrinsic energy dependence, k{sub bq}{sup rel}, is determined. The new P{sub phant} values and relative absorbed-dose sensitivities, S{sub AD}{sup rel}, calculated as the product of (f{sup rel}){sup −1} and (k{sub bq}{sup rel}){sup −1}, are used to individually revise the measured DRCs for comparison with Monte Carlo calculated values and TG-43U1 or TG-43U1S1 consensus values. Results: In general, f{sup rel} is sensitive to the energy spectra and models of the brachytherapy seeds. Values may vary up to 8.4% among {sup 125}I and {sup 103}Pd seed models and common TLD shapes. P{sub phant} values depend primarily on the isotope used. Deduced (k{sub bq}{sup rel}){sup −1} values are 1.074 ± 0.015 and 1.084 ± 0.026 for {sup 125}I and {sup 103}Pd seeds, respectively. For (1 mm){sup 3} chips, this implies an overall absorbed-dose sensitivity relative to {sup 60}Co or 6 MV calibrations of 1.51 ± 1% and 1.47 ± 2% for {sup 125}I and {sup 103}Pd seeds, respectively, as opposed to the widely used value of 1.41. Values of P{sub phant} calculated here have much lower statistical uncertainties than literature values, but

  4. Depression and its risk factors after implantation of permanent pacemaker%永久性人工心脏起搏器植入术后抑郁及危险因素分析

    Institute of Scientific and Technical Information of China (English)

    王丽娜; 马娜

    2015-01-01

    Objective To analyze the incidence and risk factors of depression after implantation of artificial permanent pacemaker.Methods The patients (n=40) with implantation of artificial permanent pacemaker were chosen from Sept. 2013 to June 2014. All patients were given 24-item questionnaire of Hamilton Depression Scale (HAMD) before and after implantation, and then divided into depression group (n=15) and non-depression group (n=25) after the implantation. The data of 2 groups were compared including age, sex, marriage, income, degree of education, hypertension, diabetes, arrhythmia, negative life events, 2 or more complications, smoking and implantation time. The risk factors of depression after implantation were analyzed.Results Of 40 patients, 15 had depression and incidence was 37.5%. The comparison in income, negative life events, arrhythmia and 2 or more complications showed statistical difference (allP<0.05) between 2 groups, and then these 4 possible risk factors were given Logistic regression analysis. The results showed that income (OR=62.58, 95%CI: 1.16~3.54), negative life events (OR=218.19, 95%CI: 2.13~4.25) and arrhythmia (OR=62.62, 95%CI: 1.13~2.78) were risk factors of depression after implantation.Conclusion The incidence of depression is 37.5% after implantation of artificial permanent pacemaker, and risk factors are income, negative life events and arrhythmia.%目的:永久性人工心脏起搏器术后抑郁的发生率及危险因素分析。方法入选2013年9月~2014年6月于甘肃省第二人民医院心内科行永久性人工心脏起搏器植入术的患者40例,所有患者术前及术后行汉密尔顿(HAMD)24项抑郁量表问卷调查。术后根据量表评估结果将患者分为抑郁组(n=15)和非抑郁组(n=25)。比较两组患者在年龄、性别、婚姻、经济收入、文化程度、高血压、糖尿病、心律失常、负性生活事件、合并两种或以上疾病、吸烟、植入时间方面的资料

  5. Postoperative [{sup 125}I] seed brachytherapy in the treatment of acinic cell carcinoma of the parotid gland. With associated risk factors

    Energy Technology Data Exchange (ETDEWEB)

    Mao, Ming-hui; Zhang, Jian-Guo; Zhang, Jie; Zheng, Lei; Liu, Shu-ming; Huang, Ming-wei; Shi, Yan [Peking Univ. School and Hospital of Stomatology, Beijing (China). Dept. of Oral and Maxillofacial Surgery

    2014-11-15

    This retrospective study was undertaken to analyze data from patients receiving iodine-125 ([{sup 125}I]) seed brachytherapy postoperatively for the treatment of acinic cell carcinoma (ACC) of the parotid gland along with the following risk factors: residual tumor, recurrent tumor, facial nerve invasion, positive resection margins, advanced tumor stage, or tumor spillage. Twenty-nine patients with ACC (17 females, 12 males; age range, 13-73 years; median age, 37.3 years) were included. Median follow-up was 58.2 months (range, 14-122 months). Patients received [{sup 125}I] seed brachytherapy (median actuarial D90, 177 Gy) 3-41 days (median, 14 days) following surgery. Radioactivity was 18.5-33.3 MBq per seed, and the prescription dose was 80-120 Gy. The 3-, 5-, and 10-year rates of local control were 93.1, 88.7, and 88.7 %, respectively; overall survival was 96.6, 92, and 92 %; disease-free survival was 93.1, 88.4, and 88.4 %; and freedom from distant metastasis was 96.6, 91.2, and 91.2 %. Lymph node metastases were absent in all patients, although two patients died with distant metastases. Facial nerve recovery was quick, and no severe radiotherapy-related complications were noted. Recurrence history, local recurrence, and distant metastasis significantly affected overall survival. Postoperative [{sup 125}I] seed brachytherapy is effective in treating ACC and has minor complications. Patients with a history of recurrence showed poor prognosis and were more likely to experience disease recurrence and develop metastases. (orig.) [German] Diese retrospektive Studie wurde durchgefuehrt, um die Daten von Patienten zu analysieren, die postoperativ eine Seed-Brachytherapie mit Iod-125 ([{sup 125}I]) zur Behandlung von Azinuszellkarzinomen der Ohrspeicheldruese mit begleitenden Risikofaktoren, wie Residualtumor, Rezidivtumor, Invasion in den N. facialis, positive (= nicht tumorfreie) Resektionsraender, fortgeschrittenes Tumorstadium oder lokale Verbreitung von Tumorzellen

  6. Experiência brasileira com uso de marcapasso cardíaco artificial: resultados atuais obtidos pelo Registro Brasileiro de Marcapassos - RBM Brazilian permanent cardiac pacemaker implantation experience: results obtained from the Brazilian Pacemaker Register's data

    Directory of Open Access Journals (Sweden)

    Roberto Costa

    1995-06-01

    Estimulação Cardíaca Artificial (DECA, com o apoio das empresas fornecedoras de marcapasso, e o respaldo do Ministério da Saúde permitiram que a implantação do RBM ocorresse da forma mais tranqüila possível. Hoje se dispõe de uma estatística nacional, volumosa e confiável, sobre a cirurgia de marcapasso no Brasil. As dificuldades enfrentadas estão relacionadas, principalmente, à estrutura individual de coleta de dados e a graus variados de familiaridade com o formulário, dificuldades estas que, com o tempo, tenderão a desaparecer.BACKGROUND: Brazilian Pacemaker Registry (RBM is a nationwide database to collect informations about all permanent pacemaker procedures performed in Brazil. It is a task force composed by Medical Society, Health Ministeryand Pacemaker Companies. OBJECTIVE: To report the data obtained from June to December, 1994. METHODS: From June 1 st to December 31,1994,4696 surgical procedures for permanent cardiac pacing were informed. These procedures were 3403 (72,5% initial implantations, 1053 (22.4% re-operations and in 240 cases this information was non-available. RESULTS: From 3403 initial implantations informed, 52.8% were males and 73.7% Caucasians. Preoperative dizziness or syncopes were refered in 76.4% and congestive heart failure in 85.0% of the patients. EKG evaluation showed 3rd degree atrioventricular (AV block in 57.7%, sick sinus syndrome in 13.9%, 2nd degree AV block in 13.8%, and high degree AV block and flutter or atrial fibrillation in 6.6% of patients. Chaga's disease was the prédominât ethiology (30.4%. Ventricular pacemakers were implanted in 83.6% of cases, atrioventricular in 16.1 % and atrial pacing in 0.3%. In the 1053 cases of re-operation, the interval between the initial implantation and the present procedure ranged from 1 month to 24 years (M=7.1 years. Pulse generator replacements were refered in 917 patients (87.0% of re-operation procedures, 65.7% of them at the end of life. Atrial lead replacement were

  7. AAPM recommendations on dose prescription and reporting methods for permanent interstitial brachytherapy for prostate cancer: report of Task Group 137.

    Science.gov (United States)

    Nath, Ravinder; Bice, William S; Butler, Wayne M; Chen, Zhe; Meigooni, Ali S; Narayana, Vrinda; Rivard, Mark J; Yu, Yan

    2009-11-01

    During the past decade, permanent radioactive source implantation of the prostate has become the standard of care for selected prostate cancer patients, and the techniques for implantation have evolved in many different forms. Although most implants use 125I or 103Pd sources, clinical use of 131Cs sources has also recently been introduced. These sources produce different dose distributions and irradiate the tumors at different dose rates. Ultrasound was used originally to guide the planning and implantation of sources in the tumor. More recently, CT and/or MR are used routinely in many clinics for dose evaluation and planning. Several investigators reported that the tumor volumes and target volumes delineated from ultrasound, CT, and MR can vary substantially because of the inherent differences in these imaging modalities. It has also been reported that these volumes depend critically on the time of imaging after the implant. Many clinics, in particular those using intraoperative implantation, perform imaging only on the day of the implant. Because the effects of edema caused by surgical trauma can vary from one patient to another and resolve at different rates, the timing of imaging for dosimetry evaluation can have a profound effect on the dose reported (to have been delivered), i.e., for the same implant (same dose delivered), CT at different timing can yield different doses reported. Also, many different loading patterns and margins around the tumor volumes have been used, and these may lead to variations in the dose delivered. In this report, the current literature on these issues is reviewed, and the impact of these issues on the radiobiological response is estimated. The radiobiological models for the biological equivalent dose (BED) are reviewed. Starting with the BED model for acute single doses, the models for fractionated doses, continuous low-dose-rate irradiation, and both homogeneous and inhomogeneous dose distributions, as well as tumor cure

  8. (99m) Tc-labelled human serum albumin cannot replace (125) I-labelled human serum albumin to determine plasma volume in patients with liver disease

    DEFF Research Database (Denmark)

    Henriksen, Ulrik Lütken; Henriksen, Jens H; Bendtsen, Flemming

    2013-01-01

    -labelled human serum albumin (99mTc-HSA) and iodine-labelled human serum albumin (125I-HSA), as the former may have advantages at repeated measurements and the latter is the classical gold standard. Study population and methods In 88 patients, (64 with liver disease, mainly cirrhosis, and 24 patients without......Summary Background and aims Determination of plasma volume (PV) is important in several clinical situations. Thus, patients with liver disease often have augmented PV as part of their sodium–water retention. This study was undertaken to compare PV determination by two indicators: technetium...... liver disease), simultaneous measurements of PV were taken with 99mTc-HSA and 125I-HSA after 1 h in the supine position. Blood samples were obtained before and 10 min after quantitative injection of the two indicators. In a subset of patients (n = 32), the measurements were repeated within 1 h. Results...

  9. Clinical Observation on the Effect of Xiaoyan Decoction plus 125I and Thermotherapy on the Lung Cancer of late stage%消岩汤联合125I粒子及热疗治疗中晚期肺癌疗效观察

    Institute of Scientific and Technical Information of China (English)

    贾英杰; 张蕴超; 李小江; 方文岩; 陈军; 赵成

    2011-01-01

    Objective To observe the effect of Xiaoyan Decoction (Herbal decoction for cancer) plus 125I particle implantation and high frequency thermotherapy on the lung cancer of late stage. Methods Thirty-nine cases of the late stage lung cancer were divided into 3 groups: Xiaoyan Decoction group, Xiaoyan Decoction plus 125I particle implantation group (oral taking Xiaoyan Decoction for 3 days and then 125I particle implantation), and Xiaoyan Decoction plus 125I particle implantation and high frequency thermotherapy group (oral taking Xiaoyan Decoction for 3 days and then 125I particle implantation, 7 days later high frequency thermotherapy in vitro). After treatment, all patients were re-examined by chest CT to compare the tumor size, and Karnofsky scores, changes of body weight, immune indices (NK cells, T cell subpopulation), and tumor markers (carcinoembryonic antigen, CEA), (cellular cutin fragment-19) were observed. Results In the aspect of tumor size, the comparison with before treatment showed that there was no statistical difference after treatment in all 3 groups (P>0.05). The Xiaoyan Decoction plus 125I particle implantation and high frequency thermotherapy group was effective in decreasing and stabilizing the tumor size.In the aspect of Karnofsky scores, changes of body weight, and immune indices, the comparison with before treatment showed that there was no statistical difference after treatment in all 3 groups (P>0. 05). The Xiaoyan Decoction group and Xiaoyan Decoction plus 125I particle implantation and high frequency thermotherapy group were showing tendency in improving the organism state of patients. Xiaoyan Decoction group presented effect in improving the tiredness, insomnia, and loss of appetite of the patients(P<0. 05). Conclusion Xiaoyan Decoction, 125I particle implantation, and high frequency thermotherapy in vitro used in combination is effective on the lung cancer of late stage and these three method have synergy effect.%目的

  10. Quantitative autoradiography of the binding sites for ( sup 125 I) iodoglyburide, a novel high-affinity ligand for ATP-sensitive potassium channels in rat brain

    Energy Technology Data Exchange (ETDEWEB)

    Gehlert, D.R.; Gackenheimer, S.L.; Mais, D.E.; Robertson, D.W. (Eli Lilly and Co., Indianapolis, IN (USA))

    1991-05-01

    We have developed a high specific activity ligand for localization of ATP-sensitive potassium channels in the brain. When brain sections were incubated with ({sup 125}I)iodoglyburide (N-(2-((((cyclohexylamino)carbonyl)amino)sulfonyl)ethyl)-5-{sup 125}I-2- methoxybenzamide), the ligand bound to a single site with a KD of 495 pM and a maximum binding site density of 176 fmol/mg of tissue. Glyburide was the most potent inhibitor of specific ({sup 125}I)iodoglyburide binding to rat forebrain sections whereas iodoglyburide and glipizide were slightly less potent. The binding was also sensitive to ATP which completely inhibited binding at concentrations of 10 mM. Autoradiographic localization of ({sup 125}I)iodoglyburide binding indicated a broad distribution of the ATP-sensitive potassium channel in the brain. The highest levels of binding were seen in the globus pallidus and ventral pallidum followed by the septohippocampal nucleus, anterior pituitary, the CA2 and CA3 region of the hippocampus, ventral pallidum, the molecular layer of the cerebellum and substantia nigra zona reticulata. The hilus and dorsal subiculum of the hippocampus, molecular layer of the dentate gyrus, cerebral cortex, lateral olfactory tract nucleus, olfactory tubercle and the zona incerta contained relatively high levels of binding. A lower level of binding (approximately 3- to 4-fold) was found throughout the remainder of the brain. These results indicate that the ATP-sensitive potassium channel has a broad presence in the rat brain and that a few select brain regions are enriched in this subtype of neuronal potassium channels.

  11. Receptor binding characterization of the benzodiazepine radioligand sup 125 I-Ro16-0154: Potential probe for SPECT (Single Photon Emission Computed Tomography) brain imaging

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, E.W.; Woods, S.W.; Zoghbi, S.; Baldwin, R.M.; Innis, R.B. (Yale Univ., West Haven, CT (USA)); McBride, B.J. (Medi-Physics, Inc., Emeryville, CA (USA))

    1990-01-01

    The binding of an iodinated benzodiazepine (BZ) radioligand has been characterized, particularly in regard to its potential use as a neuroreceptor brain imaging agent with SPECT (Single Photon Emission Computed Tomography). Ro16-0154 is an iodine-containing BZ antagonist and a close analog of Ro15-1788. In tissue homogenates prepared from human and monkey brain, the binding of {sup 125}I-labeled Ro16-0154 was saturable, of high affinity, and had high ratios of specific to non-specific binding. Physiological concentrations of NaCl enhanced specific binding approximately 15% compared to buffer without this salt. Kinetic studies of association and dissociation demonstrated a temperature dependent decrease in affinity with increasing temperature. Drug displacement studies confirmed that {sup 125}I-Ro16-0154 binds to the central type BZ receptor: binding is virtually identical to that of {sup 3}H-Ro15-1788 except that {sup 125}I-Ro16-0154 shows an almost 10 fold higher affinity at 37{degree}C. These in vitro results suggest that {sup 123}I-labeled Ro16-0154 shows promise as a selective, high affinity SPECT probe of the brain's BZ receptor.

  12. The Effect of Scattering from Leg Region on Organ Doses in Prostate Brachytherapy for 103Pd, 125I and 131Cs Seeds

    Directory of Open Access Journals (Sweden)

    Seyed Milad Vahabi

    2016-09-01

    Full Text Available Introduction Dose calculation of tumor and surrounding tissues is essential during prostate brachytherapy. Three radioisotopes, namely, 125I, 103Pd, and 131Cs, are extensively used in this method. In this study, we aimed to calculate the received doses by the prostate and critical organs using the aforementioned radioactive seeds and to investigate the effect of scattering contribution for the legs on dose calculations. Materials and Methods The doses to organs of interest were calculated using MCNPX code and ORNL (Oak Ridge National Laboratory phantom. Results Doses to the prostate as a source of radiation for 125I, 103Pd, and 131Cs were approximately 108.9, 97.7, and 81.5 Gy, respectively. Bladder, sigmoid colon, and testes received higher doses than other organs due to proximity to the prostate. Differences between the doses when tallying with the legs intact and with the legs voided were significant for testes, sigmoid colon contents, and sigmoid colon wall because of their proximity to the prostate. There was also a good consistency between our results and the data published by Montefiore Medical Center and Albert Einstein College of Medicine for the prostate. Conclusion Scattering from leg region had a significant effect on doses to testes, sigmoid colon contents, and sigmoid colon wall in the pelvic region, and prostate and the other organs were unaffected. Brachytherapy treatment plans using 131Cs seeds allow for better sparing of critical tissues, with a comparable number of, or fewer, seeds required, compared to 125I seeds.

  13. Relationship of changing delta 4-steroid 5 alpha-reductase activity to (125I)iododeoxyuridine uptake during regeneration of involuted rat prostates

    Energy Technology Data Exchange (ETDEWEB)

    Kitahara, S.; Higashi, Y.; Takeuchi, S.; Oshima, H. (Tokyo Medical and Dental Univ. (Japan))

    1989-04-01

    To elucidate the phenotypic expression of proliferating prostatic cells, rats were castrated, and the regenerating process of involuted ventral prostates during testosterone propionate (TP) administration was investigated by examining morphology, (5-{sup 125}I)iododeoxyuridine ({sup 125}I-UdR) uptake, DNA content, weight, acid phosphatase, and delta 4-steroid 5 alpha-reductase (5 alpha-reductase) activities. Morphologically, TP treatment initially increased the number of epithelial cells lining glandular lobules and subsequently restored the shape of epithelial cells. {sup 125}I-UdR uptake peaked on Day 3 of TP treatment and stayed at higher levels than for uncastrated controls until Day 14 of treatment. Prostatic weight, protein content, acid phosphatase, and DNA content returned to uncastrated control levels by Day 14 of TP treatment. TP administration markedly stimulated prostatic 5 alpha-reductase activity, which peaked on the Day 5 of treatment and decreased to uncastrated control levels by Day 14 of treatment. It is concluded that TP administration to castrated rats initially induced active mitotic division of the remaining stem cells, followed by formation of differentiated functional epithelial cells. Prostatic 5 alpha-reductase was highly active at the initial phase of active mitotic cell division. The major portion of the increased enzyme activity can be regarded as a phenotypic expression of stem or transient cells of prostatic epithelium.

  14. Production of specific antisera for radioimmunoassay of human luteinizing hormone (LH) in the presence of human chorionic gonadotropin (hCG). [/sup 125/I

    Energy Technology Data Exchange (ETDEWEB)

    Thorell, J.I.; Jeppsson, S.; Holmstrom, B.

    1976-09-01

    A specific radioimmunoassay for LH, which measures plasma LH in the presence of human chorionic gonadotropin (hCG) is described. Rabbits were immunized with highly purified native LH. One of the antisera with a difference in its reactivity against LH and hCG was further purified by affinity chromatography on a column with hCG coupled to Sepharose 4B. The adsorbed antiserum and /sup 125/I-LH was used in a double antibody assay. The LH standard (MRC/68/40) efficiently inhibited the binding of /sup 125/I-LH, and the standard curve showed a sensitivity of 0.5 ng/ml in the sample. hCG up to 10,000 ng/ml did not inhibit the binding of /sup 125/I-LH. The plasma level of LH in pregnant women in the first trimester was low (1.3 +- 0.1 ng/ml). When LH was measured in fertile or menopausal women with or without stimulation with LH/FSH releasing hormone (LH-RH)/sup x/ the results agreed to those found with our conventional LH-assay based on antiserum against hCG.

  15. Experimental studies for immunoscintigraphy of adenocarcinoma of the prostate with [sup 125]I-labeled monoclonal antibody to [gamma]-seminoprotein

    Energy Technology Data Exchange (ETDEWEB)

    Fujino, Awato; Suyama, Kazuho; Shidara, Toshiya; Ao, Teruaki; Ishibashi, Akira; Koshiba, Ken (Kitasato Univ., Sagamihara, Kanagawa (Japan). School of Medicine)

    1994-02-01

    We established LNCaP tumor in male nude mice after inoculation of LNCaP cells. The tumor produces the organ-specific glycoproteins in the human prostate, [gamma]-seminoprotein ([gamma]-Sm). The LNCaP tumor is composed of fluid and solid portions. The fluid portion contains much more [gamma]-Sm than the solid part. Monoclonal antibody against [gamma]-Sm (murine IgG[sub 1], K) was radiolabeled with iodine-125 by lactoperoxidase method followed by passage over column chromatography. Finally the conjugates with specific activity of 49.8-56.6 KBq/[mu]g were obtained. Biodistribution of [sup 125]I- labeled monoclonal antibody to [gamma]-Sm ([sup 125]I-[gamma]MAb) was evaluated by whole-body autoradiography (ARG) and by determination of label uptake (DLU) by the LNCaP tumor using the well type gamma counter. The ARG were obtained 1-9 days after intravenous administration of 32-38 [mu]g of [sup 125]I-[gamma]MAb to 12 nude mice bearing LNCaP tumor. The DLU were evaluated 3, 4 and 7 days after intravenous administration of 18-25 [mu]g of [sup 125]I- [gamma]MAb to 9 nude mice bearing LNCaP tumor. The DLU by organs (fluid portion, solid portion, liver, kidney, spleen, lung, etc.) were expressed as F-values (%) which were calculated by the following formula: F=radioactivity per gram of tissue (dpm/g) / injected dose per gram of animal (dpm/g)x100 and tissue-to-blood ratios (T/B). The specific uptake by the LNCaP tumors, especially in the fluid portion, was observed on ARG, with optimal images of the tumor evaluated 4-7 days after administration. The F-values and T/B of the LNCaP tumors were always higher than those of other organs. Especially T/B of fluid portion were of 6.7 and 6.3, evaluated 4 and 7 days after administration of [sup 125]I-[gamma]MAb respectively. These results suggest that the radiolabeled [gamma] MAb is applicable for immunoscintigraphy of adenocarcinoma of the prostate. (author).

  16. Utilização da veia ilíaca externa recanalizada para implante de cateter de longa permanência para hemodiálise Using recanalized external iliac vein for tunneled hemodialysis catheter insertion

    Directory of Open Access Journals (Sweden)

    Ricardo Wagner da Costa Moreira

    2008-06-01

    Full Text Available O uso de cateteres venosos cervicais para hemodiálise leva freqüentemente à oclusão dessas veias. Como alternativa, os acessos venosos femorais são válidos, porém o seu uso também está associado à oclusão dessas veias e a um maior índice de infecção. Vias alternativas são cada vez mais utilizadas na impossibilidade dos acessos previamente mencionados. Descrevemos neste relato de caso uma alternativa para o implante de cateter de longa permanência para hemodiálise usando a veia ilíaca externa recanalizada. Comentamos os detalhes da técnica utilizada, suas vantagens e desvantagens.The frequent insertion of cervical venous catheters for hemodialysis is closely related to venous stenosis or occlusion. As an alternative, femoral catheter insertions are helpful but are also associated with femoral vein occlusion and an even higher infection rate. Alternative venous accesses have been increasingly used when the aforementioned accesses are not feasible. We report a case in which a recanalized external iliac vein was used for hemodialysis tunneled catheter insertion. The technique approach is discussed, focusing on its advantages and disadvantages.

  17. 心脏起搏器围术期预防性应用抗生素现状调查%Current status of perioperative antibiotic prophylaxis for permanent pacemaker implantation

    Institute of Scientific and Technical Information of China (English)

    陈柯萍; 樊晓寒; 华伟; 张澍

    2013-01-01

    Objective The aim of this survey was to describe the current status of perioperative antibiotic prophylaxis for permanent pacemaker (PPM) implantation in our clinical practice.Methods From January to March in 2012,questionnaires were sent by e-mails to directors of PPM implanting hospitals,for clinical details with respect to use of antibiotics around implantation.Data would be verified via telephone,e-mail or follow-up if no response or some doubts existed.Results Available questionnaires were returned from135 hospitals.Before or during procedure,112 of the 135 centers (82.9%) gave prophylactic antibiotics to patients,while 14 hospitals (10.4%) used postoperative antibiotics and 9 (6.7%) with no prescription of antibiotics.The first/second generation cephalosporins or penicillins were used in significant proportion (79.2%) of hospitals.Other options included the third generation cephalosporins (6.7%) and quinolones (2.2%).As for the onset time,in 74.1% of the hospitals antibiotics were administered 0.5 to 2.0 hours prior to implantation,with 5.2% 3 to 6 hours before procedure,3.7% at implantation,10.3% post operation.The duration also showed great variation in different hospitals.Single dose of antibiotics prescription before or during procedure was given in 10 centers (7.9%).The duration was over 72 hours in seventeen hospitals and ranged from 24 to 72 hours in the rest hospitals.Intra-pocket antibiotic infusion at implantation was used in forty-eight centers (35.6%),and most (81.3%) were gentamicin.Conclusion There are no guidelines on the antibiotics prophylaxis in PPM implantation,such as indication,choice,timing and duration,resulting in wide variation in practice.In majority of the hospitals prophylactic antibiotics were used prior to implantation and β-lactam antibiotic for a board antibacterial spectrum was selected which covering staphylococcus aureus.However,further studies are required to determine the duration of antibiotics

  18. A prospective study: intraoperative 125|radioactive seed implant therapy in advanced esophageal squamous cell carcinoma

    Institute of Scientific and Technical Information of China (English)

    Jin Lü; Xiufeng Cao; Bin Zhu; Lü Ji

    2009-01-01

    Objective: To investigated the role of in traoperative iodine-125 (125I) brachytherapy as a treatment option for advanced thoracic esophageal squamous cell carcinoma (ESCC). Methods: Using preoperative computed tomography (CT)-based staging criteria, between 2000 and 2008, 298 patients with ESCC (stage II-III) were enrolled in this prospective study. With informed consent, patients were randomized into two groups: intraoperative 125I seed implantation and surgery alone (control group). Twenty to forty 125I seeds (0.5 mCi per seed), with a total activity in 10-30 mCi, and a matched peripheral dose (MPD) of 60~70 Gy, were implanted under direct visualization. The surgical procedure used in this study was either a radical resection, which involved an esophagectomy through a left thoracotomy with two-field lymphadenectomy, or palliative resection. The postoperative complications were observedand recorded. The location and quality assessment of 125I seeds were assessed using CT scans or X-ray imaging. The short-term efficacy was evaluated according to WHO criteria. The 1, 3, 5 and 7-year survival rates were determined on follow-up. Results: There was no displacement or loss of 125I seeds. The local recurrence rates in the intraoperative 125I seed implantation group and control group were 14.9% and 38.7%, respectively (P 0.05). The 1-year survival rate of the two groups were not significantly different (P > 0.05). However, the 3, 5 and 7-year survival rates in the united 125I group (64%, 55.3% and 8%, respectively) were statistically different from those in the control group (52%, 29.1% and 1.4%,respectively)(P < 0.05). Conclusion: Intraoperative 125I seed implantation is safe and effective for advanced ESCC. Seed implantation may reduce the local recurrence rate and improve survival in patients with ESCC. The MPD of 60~70 Gy, with single 125I seed activity of 0.5 mCi, is reasonable.

  19. Beta 1- and beta 2-adrenergic /sup 125/I-pindolol binding sites in the interpeduncular nucleus of the rat: Normal distribution and the effects of deafferentation

    Energy Technology Data Exchange (ETDEWEB)

    Battisti, W.P.; Artymyshyn, R.P.; Murray, M.

    1989-07-01

    The plasticity of the beta 1- and beta 2-adrenergic receptor subtypes was examined in the interpeduncular nucleus (IPN) of the adult rat. The beta-adrenergic receptor antagonist 125I-pindolol (125I-PIN) was used in conjunction with the selective subtype antagonists ICI 118,551 and ICI 89,406 to determine the subnuclear distribution of beta 1- and beta 2-adrenergic receptors in this nucleus and to correlate the receptor distribution with the distribution of both noradrenergic afferents from the locus coeruleus (LC) and non-noradrenergic afferents from the fasiculus retroflexus (FR). The density of these binding sites was examined following lesions that decreased (LC lesions) or increased (FR lesions) the density of the noradrenergic projection in the IPN. Quantitative radioautography indicated that beta 1-labeled binding sites account for the larger percentage of binding sites in the IPN. The beta 1-binding sites are densest in those subnuclei that receive a noradrenergic projection from the LC: the central, rostral, and intermediate subnuclei. beta 1-binding sites are algo homogeneously distributed throughout the lateral subnuclei, where there is no detectable noradrenergic innervation. beta 2-binding sites have a more restricted distribution. They are concentrated in the ventral half of the lateral subnuclei, where they account for 70% of total 125I-PIN binding sites. beta 2-binding sites are also present along the ventral border of the IPN. Some of this labeling extends into the central and intermediate subnuclei. Bilateral lesions of the LC, which selectively remove noradrenergic innervation to the IPN, result in an increase in the beta 1-binding sites. Bilateral lesions of the FR, which remove the major cholinergic and peptidergic input from the IPN, elicit an increase in noradrenergic projections and a decrease in beta 1-binding sites.

  20. Studies of the biogenic amine transporters. IV. Demonstration of a multiplicity of binding sites in rat caudate membranes for the cocaine analog [125I]RTI-55.

    Science.gov (United States)

    Rothman, R B; Cadet, J L; Akunne, H C; Silverthorn, M L; Baumann, M H; Carroll, F I; Rice, K C; de Costa, B R; Partilla, J S; Wang, J B

    1994-07-01

    The drug 3 beta-[4'-iodophenyl]tropan-2 beta-carboxylic acid methyl ester (RTI-55) is a cocaine congener with high affinity for the dopamine transporter (Kd < 1 nM). The present study characterized [125I]RTI-55 binding to membranes prepared from rat, monkey and human caudates and COS cells transiently expressing the cloned rat dopamine (DA) transporter. Using the method of binding surface analysis, two binding sites were resolved in rat caudate: a high-capacity binding site (site 1, Bmax = 11,900 fmol/mg of protein) and a low-capacity site (site 2, Bmax = 846 fmol/mg of protein). The Kd (or Ki) values of selected drugs at the two sites were as follows: (Ki for high-capacity site and Ki for low-capacity site, respectively): RTI-55 (0.76 and 0.21 nM), 1-[2-diphenyl-methoxy)ethyl]-4-(3-phenylpropyl)piperazine (0.79 and 358 nM), mazindol (37.6 and 631 nM), 2 beta-carbomethoxy-3 beta-(4-fluorophenyl)tropane (45.0 and 540 nM) and cocaine (341 and 129 nM). Nisoxetine, a selective noradrenergic uptake blocker, had low affinity for both sites. Serotonergic uptake blockers had a high degree of selectivity and high affinity for the low-capacity binding site (Ki of citalopram = 0.38 nM; Ki of paroxetine = 0.033 nM). The i.c.v. administration of 5,7-dihydroxytryptamine to rats pretreated with nomifensine (to protect dopaminergic and noradrenergic nerve terminals) selectively decreased the Bmax of site 2, strongly supporting the idea that site 2 is a binding site on the serotonin (5-HT) transporter. This serotonergic lesion also increased the affinity of [125I]RTI-55 for the DA transporter by 10-fold. The ligand selectivity of the caudate 5-HT transporter was different from the [I125]RTI-55 binding site on the 5-HT transporter present in membranes prepared from whole rat brain minus caudate. The [125I]RTI-55 binding to the DA transporter was further resolved into two components, termed sites 1a and 1b, by using human and monkey (Macaca mulatta) caudate membranes but not the

  1. Synthesis and evaluation of [{sup 125}I]I-TSA as a brain nicotinic acetylcholine receptor {alpha}{sub 7} subtype imaging agent

    Energy Technology Data Exchange (ETDEWEB)

    Ogawa, Mikako [Laboratory of Genome Bio-Photonics, Photon Medical Research Center, Hamamatsu Medical University, Hamamatsu 431-3192 (Japan); Tatsumi, Ryo [Pharmaceuticals Research Unit, Research and Development Division, Mitsubishi Pharma Corporation, Yokohama 227-0033 (Japan); Fujio, Masakazu [Pharmaceuticals Research Unit, Research and Development Division, Mitsubishi Pharma Corporation, Yokohama 227-0033 (Japan); Katayama, Jiro [Pharmaceuticals Research Unit, Research and Development Division, Mitsubishi Pharma Corporation, Yokohama 227-0033 (Japan); Magata, Yasuhiro [Laboratory of Genome Bio-Photonics, Photon Medical Research Center, Hamamatsu Medical University, Hamamatsu 431-3192 (Japan)]. E-mail: magata@hama-med.ac.jp

    2006-04-15

    Introduction: Some in vitro investigations have suggested that the nicotinic acetylcholine receptor (nAChR) {alpha}{sub 7} subtype is implicated in Alzheimer's disease, schizophrenia and others. Recently, we developed (R)-3'-(5-bromothiophen-2-yl)spiro[1-azabicyclo[2.2.2]octane-3,5'-[1',3'] oxazolidin]-2'-one (Br-TSA), which has a high affinity and selectivity for {alpha}{sub 7} nAChRs. Therefore we synthesized (R)-3'-(5-[{sup 125}I]iodothiophen-2-yl)spiro[1-azabicyclo[2.2.2]octane-3,5'- [1',3']oxazolidin]-2'-one ([{sup 125}I]I-TSA) and evaluated its potential for the in vivo detection of {alpha}{sub 7} nAChR in brain. Methods: In vitro binding affinity of I-TSA was measured in rat brain homogenates. Radioiodination was accomplished by a Br-I exchange reaction. Biodistribution studies were undertaken in mice by tail vein injection of [{sup 125}I]I-TSA. In vivo receptor blocking studies were carried out by treating mice with methyllycaconitine (MLA; 5 nmol/5 {mu}l, i.c.v.) or nonradioactive I-TSA (50 {mu}mol/kg, i.v.). Results: I-TSA exhibited a high affinity and selectivity for the {alpha}{sub 7} nAChR (K {sub i} for {alpha}{sub 7} nAChR=0.54 nM). Initial uptake in the brain was high (4.42 %dose/g at 5 min), and the clearance of radioactivity was relatively slow in the hippocampus ({alpha}{sub 7} nAChR-rich region) and was rather rapid in the cerebellum ({alpha}{sub 7} nAChR poor region). The hippocampus to cerebellum uptake ratio was 0.9 at 5 min postinjection, but it was increased to 1.8 at 60 min postinjection. Although the effect was not statistically significant, administration of I-TSA and MLA decreased the accumulation of radioactivity in hippocampus. Conclusion: Despite its high affinity and selectivity, [{sup 125}I]I-TSA does not appear to be a suitable tracer for in vivo {alpha}{sub 7} nAChR receptor imaging studies due to its high nonspecific binding. Further structural optimization is needed.

  2. Production of {sup 125}I from amorphous films of Si doped with {sup 124}Xe and evaluation of its potential use in brachytherapy

    Energy Technology Data Exchange (ETDEWEB)

    Leal, Alexandre S., E-mail: asleal@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Viana, Gustavo A., E-mail: gviana@eletronuclear.gov.br [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Instituto de Fisica Gleb Wataghin; Siqueira, Paulo T.D.; Saiki, Mitiko, E-mail: mitiko@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2015-07-01

    This work describes the simulation of a new material that can be used in the brachytherapy treatment. The material consists of xenon-incorporated amorphous silicon (Xe@a-Si). The irradiated {sup 124}Xe atoms of the samples are converted into {sup 125}Xe, according to the reaction: {sup 124}Xe (n,γ) {sup 125}Xe that, in turn, decays to the radioisotope {sup 125}I. A set of simulations performed using the MCNP5 code, shows that, in principle, the material proposed can be used in the seed of brachytherapy in the clinical treatment. (author)

  3. 高龄患者永久心脏起搏器植入术41例临床分析%Clinical analysis of permanent cardiac pacemaker implanted in 41 elderly patients

    Institute of Scientific and Technical Information of China (English)

    周缨; 谷惠敏; 陈宗建

    2011-01-01

    Objective To analyse the clinical characteristics of elderly patients with permanent cardiac pacemaker implanted. Methods To retrospectively analyze 41 elderly patients( ≥80 years) with permanent pacemakers implantation. Observing the clinical symptoms, bradyarrhythmia category, pacing mode, intraoperative pacing parameters,intraoperative and postoperative complications. Results All patients were operated successfully. Pacing modes were,VVI 29 cases,VVIR 2 cases,DDD 9 cases and DDDR 1 case. Ventricular electrode located in right ventricular apical pacing. Atrial electrode located right heart ear. During the operateing, severe complications did not happen such as heart perforation, malignant arrhythmia. One case of postoperative dislocation electrode and one case of pocket hematocele were observed. After treatment, they were cured, no infection and pacemaker syndrome happened. 6 patients died during follow-up, postoperative from two months to 6 years. Conclusion Pacing therapy in elderly patients is good. Surgical risk was not increased.%目的:分析高龄患者植入永久心脏起搏器的临床特点及并发症发生情况。方法对植入永久心脏起搏器的41例高龄(≥80岁)患者临床资料进行回顾性分析,观察临床症状、缓慢心律失常的类型、起搏模式、术中起搏参数、术中和术后并发症等。结果41例患者手术均成功完成。起搏模式:心室单腔起搏器VVI 29例、VVIR 2例、房室双腔起搏器DDD 9例,房室双腔频率适应性起搏器DDDRI例;心室电极位于右室心尖部,心房电极位于右心耳。术中无心脏穿孔、恶性心律失常等严重并发症发生;术后发生电极脱位1例、囊袋血肿1例,经治疗后治愈,无感染、起搏器综合征发生。随访中死亡6例,死于术后2月至6年。结论高龄患者植入心脏起搏器,手术风险并不增加,治疗效果较好。

  4. 永久性可植入式搏动流叶轮型人工心脏的探索与研究%A Permanent Implantable Pulsatile Impeller Heart with a Specially Devised Needle Bearing

    Institute of Scientific and Technical Information of China (English)

    钱坤喜; 曾培; 茹伟民; 袁海宇; 封志刚; 李岚

    2001-01-01

    我们研制的可植入式搏动流叶轮型人工心脏可辅助试验小牛 血液循环数个 月。试验终止大多由于机械轴承磨损,导致转子振动,直至血泵运行出现故障。若轴承不发 生故障,试验可一直进行下去。试验中动物状况良好,所有血液生化数据均处于正常范围。 为解决轴承磨损问题,我们研制了一种特殊的滚针轴承,其中滚针由超高分子量聚乙烯制成 ,磨损寿命在一年以上。这种新型的叶轮型人工心脏有望用于长期或永久性辅助循环。%The author's implantable pulsatile impeller pump can assist the circulation of the calves for several months. The termination of the experiments was related to wear of the mechanical bearing, which resulted in vibration of the rotor and pump failure. It seemedas if the experiments could have lasted inde finitelyif the bearing had not failed. To solve the problem of bearing wear, a specially devised rolling bearing was investigated and applied to the impellerp ump. Its service life is more than 10 years due to the wear-proof roller made of ultra-high-molecular weight polythene. This newly devised impeller heart promises to have long-term and permanent applications. Compared with the magnetic bearing, the rolling bearing has the advantages of simpler construction and control, no consumption of energy, and better reliability.

  5. 永久起搏器植入术后谵妄的危险因素研究%Incidence and risk factors of delirium in patients post permanent pacemaker implantation

    Institute of Scientific and Technical Information of China (English)

    朱孔博; 叶行舟; 陈龙; 智宏; 任利群; 马根山

    2016-01-01

    目的 探讨永久起搏器植入术后谵妄的危险因素.方法 入选2013年9月至2015年2月期间我院行永久起搏器植入术的患者,收集临床资料和实验室检查数据,术后当天及第1、2、3天用谵妄评定法进行谵妄评估.根据术后是否发生谵妄将患者分为术后谵妄组和对照组,通过单因素及多因素分析研究术后谵妄危险因素.结果 225例患者入选,术后谵妄组12例(5.3%),对照组213例(94.7%).与对照组比较,术后谵妄组年龄更高[(83±5)岁比(74±11)岁,P=0.002],术前血压显著异常者比例更高[58.3% (7/12)比4.7%(10/213),P<0.001],收缩压较高[(157±35)mmHg比(136±22) mmHg,1 mmHg=0.133 kPa,P=0.007],低钠血症发生率较高[25.0% (3/12)比5.2% (11/213),P=0.030],术前平均心率较慢[(47±18)次/min比(58±15)次/min,P=0.007].采用前进逐步法将年龄、术前血压显著异常、低钠血症、术前平均心率、陈旧性脑梗死作为自变量纳入logistic回归模型分析显示,高龄(OR=2.984,95%CI1.226 ~7.624,P=0.016)、术前血压显著异常(OR=27.393,95%CI6.735 ~ 111.417,P<0.001)与术后谵妄相关.结论 高龄和术前血压显著异常是永久起搏器植入术后谵妄的危险因素.%Objective To evaluate the incidence and risk factors of postoperative delirium in patients post permanent pacemaker implantation.Methods Patients underwent permanent pacemaker implantation in our department from September 2013 to February 2015 were included in this study.Delirium was measured by the confusion assessment method on the first three postoperative days.All the patients were divided into the postoperative delirium group and the non-delirium control group according to whether new onset delirium was diagnosed.Risk factors significantly associated with postoperative delirium detected by univariate analysis were entered into multivariable analysis to define the independent predictors of postoperative delirium.Results A total of

  6. Survival of patients with advanced pancreatic cancer after iodine125 seeds implantation brachytherapy

    Science.gov (United States)

    Han, Quanli; Deng, Muhong; Lv, Yao; Dai, Guanghai

    2017-01-01

    Abstract Background: Brachytherapy with iodine125-labeled seeds (125I-seeds) implantation is increasingly being used to treat tumors because of its positional precision, minimal invasion, least damage to noncancerous tissue due to slow and continuous release of radioactivity and facilitation with modern medical imaging technologies. This study evaluates the survival and pain relief outcomes of the 125I-seeds implantation brachytherapy in advanced pancreatic cancer patients. Methods: Literature search was carried out in multiple electronic databases (Google Scholar, Embase, Medline/PubMed, and Ovid SP) and studies reporting I125 seeds implantation brachytherapy in pancreatic cancer patients with unresectable tumor were selected by following predetermined eligibility criteria. Random effects meta-analysis was performed to achieve inverse variance weighted effect size of the overall survival rate after the intervention. Sensitivity and subgroups analyses were also carried out. Results: Twenty-three studies (824 patients’ data) were included in the meta-analysis. 125I-seeds implantation brachytherapy alone was associated with 8.98 [95% confidence interval (CI): 6.94, 11.03] months (P < 0.00001) overall survival with 1-year survival of 25.7 ± 9.3% (mean ± standard deviation; SD) and 2-year survival was 17.9 ± 8.6% (mean ± SD). In stage IV pancreatic cancer patients, overall survival was 7.13 [95% CI: 4.75, 9.51] months (P < 0.00001). In patients treated with 125I-seeds implantation along with 1 or more therapies, overall survival was 11.75 [95% CI: 9.84, 13.65] months (P < 0.00001) with 1-year survival of 47.4 ± 22.75% (mean ± SD) and 2-year survival was 16.97 ± 3.1% (mean ± SD). 125I-seeds brachytherapy was associated with relief of pain in 79.7 ± 9.9% (mean ± SD) of the patients. Conclusions: Survival of pancreatic cancer patients after 125I-seeds implantation brachytherapy is found to be 9 months

  7. Analysis on clinical materials in patients with post-operation infection after implantation of permanent pacemaker%永久性心脏起搏器植入术后感染患者的临床资料分析

    Institute of Scientific and Technical Information of China (English)

    谭琛; 崔俊玉; 任晓庆; 李学斌; 胡雪红; 刘建国; 徐威; 李俊峡

    2013-01-01

    Objective To analyze retrospectively the clinical characteristics of the patients with post-operation infection after implantation of permanent pacemaker, and review different therapies. Methods The patients (n=12) with infection after implanting pacemakers (dual-chamber and three-chamber pacemaker) were chosen from Aug. 2005 to Mar. 2013. The clinical characteristics of the patients were analyzed, and different anti-infection therapies were compared (including antibiotics+local dressing change, antibiotics+debridement and sterilization of original pouch+transposition implantation of original-side pacemaker, and remove of pacemaker and lead+antibiotics+oppsite implantation of pacemaker). Results Among 12 patients, there were 11 (91.6%) with dual-chamber pacemaker and 1 (8.3%) with three-chamber pacemaker. The median of infection occurrence time was 4.5 months and follow-up time was (33.0±19.0) months. There were 10 (83.3%) complicated one or more other diseases (including diabetes, cardiac insufficiency, chronic obstructive pulmonary disease and connective tissue diseases), and 4 (33.3%) with two or more electrode leads. There were 8 cases with infection and recurrence from 10 (with expectant treatment firstly:antibiotics+local dressing change or antibiotics+debridement and sterilization of original pouch+transposition implantation of original-side pacemaker), among them, 6 were cured through whole pacemaker system, 1 was cured through pacemaker reimplantation after sterilization, and 1 had sinus tract and continues dressing change. There were 2 cases cured as they selected firstly to remove pacemaker system. Conclusion The infection of pacemaker commonly occurs in the patients with risk factors. To remove pacemaker system totally is reasonable when the infection involving the whole system.%目的回顾性分析永久性心脏起搏器植入术后感染患者的临床特点,并对不同治疗方法进行评价。方法纳入2005年8月~2013年3月植入心脏

  8. Breast Implants

    Science.gov (United States)

    ... Medical Procedures Implants and Prosthetics Breast Implants Breast Implants Share Tweet Linkedin Pin it More sharing options Linkedin Pin it Email Print Breast implants are medical devices that are implanted under the ...

  9. Preparation and primary application of 125 I labeled triplex-forming oligonucleotide loaded nanoparticles%载125I 标记三螺旋形成寡核苷酸纳米粒的制备及初步应用

    Institute of Scientific and Technical Information of China (English)

    朱姝; 曹素娥; 杨婷; 邹琼; 焦举; 张勇

    2016-01-01

    目的:构建载125 I标记反雄激素受体(AR)基因三螺旋形成寡核苷酸(125 I-TFO)纳米粒,并初步探讨其在体外对前列腺癌细胞的抑制作用。方法应用 Bolton-Hunter 法对三螺旋形成寡核苷酸进行125 I 标记,通过复乳化溶剂挥发法制备包载125 I-TFO 的纳米粒(125 I-TFO-NP),测定其粒径、形态、包封率、载药量及体外释放特点。用γ计数器测定前列腺癌细胞 LNCaP 对125 I-TFO-NP 的摄取情况,CCK-8法检测纳米粒对前列腺癌细胞增殖的抑制作用、荧光定量 PCR 和蛋白免疫印迹法检测纳米粒中 AR mRNA 表达水平。结果所获125 I-TFO 的标记率和放射化学纯度分别为(86.87±0.45)%、(96.21%±0.97)%。125 I-TFO-NP 的平均粒径为(298.2±0.5)nm,包封率与载药量分别为(70.6±6.6)%和(1.89±0.13)μg/mg,缓释作用明显。前列腺癌细胞对125 I-TFO-NP 的摄取率高于未包裹125 I-TFO (P <0.01)。与空白对照组及 TFO-NP 组比较,125 I-TFO-NP 组中前列腺癌细胞的增殖抑制率升高(P <0.01),AR mRNA 及蛋白表达水平均下降(P <0.05)。结论制备的载125 I-TFO-NP性状良好,可通过下调 AR 的表达水平,抑制前列腺癌细胞的增殖。纳米粒可为反基因放射治疗提供理想的载体。%Objective Preparing the 1 25 I labeled anti-androgen receptor (AR)gene triplex-forming oligonucleotide loaded nanoparticles,To investigate the inhibitory effects on prostate cancer cells in vitro. Methods Synthesizing the 1 25 I labeled triplex-forming oligonucleotide by Bolton-Hunter Method,then prepar-ing the 1 25 I labeled triplex-forming oligonucleotide loaded nanoparticles (1 25 I-TFO-NP)by double emulsion sol-vent evaporation method.Its size,shape,embedding ratio and drug loading and release characteristics were i-dentified.The uptake of 1 25 I-TFO-NP by prostate cancer cells was measured by

  10. Studies of the biogenic amine transporters. V. Demonstration of two binding sites for the cocaine analog [125I]RTI-55 associated with the 5-HT transporter in rat brain membranes.

    Science.gov (United States)

    Silverthorn, M L; Dersch, C M; Baumann, M H; Cadet, J L; Partilla, J S; Rice, K C; Carroll, F I; Becketts, K M; Brockington, A; Rothman, R B

    1995-04-01

    Earlier work characterized the binding of the high-affinity cocaine analog 3 beta-(4-125iodophenyl)-tropane-2-carboxylic acid methyl ester ([125I]RTI-55) to membranes prepared from rat caudate. That investigation demonstrated that [125I]RTI-55-labeled serotonin (5-HT) transporters in addition to dopamine (DA) transporters and resolved [125I]RTI-55 binding to 5-HT transporters into two distinct components. In the present study, we characterized [125I]RTI-55 binding to membranes prepared from whole rat brain minus caudate. The first series of experiments established that [125I]RTI-55 labels both DA and 5-HT transporters and that 50 nM paroxetine and either 1000 nM 1-[2-(diphenylmethoxy)ethyl]-4-(3-phenylpropyl)homopiperazine (LR1111) or 500 nM (RTI-120) could be used to block [125I]RTI-55 binding to the 5-HT and DA transporters, thereby generating selective assay conditions for the DA and 5-HT transporters, respectively. Selective lesioning of dopaminergic and serotonergic neurons with intracerebroventricular 6-hydroxydopamine and 5,7-dihydroxytryptamine selectively decreased [125I]RTI-55 binding to DA and 5-HT transporters, respectively, thereby confirming the selectivity of the assay conditions. The ligand-selectivity pattern of the whole brain minus caudate 5-HT transporter correlated significantly with that of the caudate 5-HT transporter, although there were some striking differences for selected test agents. Additional experiments resolved [125I]RTI-55 binding to the 5-HT transporter into two components. A ligand-selectivity analysis of the two components failed to identify a highly selective test agent. In summary, the major findings of the present study are that [125I]RTI-55 labels both DA and 5-HT transporters in membranes prepared from whole brain minus caudate, that 50 nM paroxetine and either 1000 nM LR1111 or 500 nM RTI-120 can be used as a blocking agent to generate selective assay conditions for the DA and 5-HT transporters, respectively, and that [125

  11. Determination of {sup 125}I impurities in [{sup 123}I]labelled radiopharmaceuticals, by liquid scintillation counting: sensitivity of the method

    Energy Technology Data Exchange (ETDEWEB)

    Bonardi, M.L. E-mail: mauro.bonardi@mi.infn.itmauro.bonari@mi.infn.it; Birattari, C.; Groppi, F.; Gini, L.; Mainardi, C.H.S.; Menapace, E

    2004-01-01

    Iodine-125 is a radioisotopic impurity 'always' present in iodine-123, produced by nuclear reactions induced either on natural or 'highly' enriched targets. Liquid scintillation counting is a very sensitive tool to determine low level impurities of both low energy electrons and photons in aqueous and organic solutions of radiopharmaceutical compounds. With this technique it was possible to determine, on commercial samples, that the content of {sup 125}I was of the order of not less than 0.1% for {sup 123}I produced via {sup 127}I(p,5n) reactions and not less than 0.01% for {sup 123}I produced via 'highly' enriched {sup 124}Xe(p,X) nuclear reactions.

  12. Rapid agonist-induced loss of sup 125 I-. beta. -endorphin opioid receptor sites in NG108-15, but not SK-N-SH neuroblastoma cells

    Energy Technology Data Exchange (ETDEWEB)

    Cone, R.I.; Lameh, J.; Sadee, W. (Univ. of California, San Francisco (United States))

    1991-01-01

    The authors have measured {mu} and {delta} opioid receptor sites on intact SK-N-SH and NG108-15 neuroblastoma cells, respectively, in culture. Use of {sup 125}I-{beta}-endorphin ({beta}E) as a tracer, together with {beta}E(6-31) to block high-affinity non-opioid binding in both cell lines, permitted the measurement of cell surface {mu} and {delta} opioid receptor sites. Labeling was at {delta} sites in NG108-15 cells and predominantly at {mu} sites in SK-N-SH cells. Pretreatment with the {mu} and {delta} agonist, DADLE, caused a rapid loss of cell surface {delta} receptor sites in NG108-15 cells, but failed to reduce significantly {mu} receptor density in SK-N-SH cells.

  13. Peptide mapping of /sup 125/I-labelled membrane protein of influenza viruses by reverse-phase high-performance liquid chromatography

    Energy Technology Data Exchange (ETDEWEB)

    Darveau, A.; Lecomte, J. (Centre de Recherche en Virologie, Institut Armand-Frappier, Laval, Quebec (Canada)); Seidah, N.G.; Chretien, M. (Institut de Recherches Cliniques de Montreal, Montreal (Canada))

    1982-03-01

    The resolution potential of reverse-phase high-performance liquid chromatography (HPLC) for peptide analysis of hydrophobic viral membranes has been investigated, using as a model the membrane (M) protein of influenza virus. Proteolytic digests of /sup 125/I-labelled M protein CNBr fragments, extracted from radioiodinated whole virus, have been separated on a uBondapak C/sub 18/ column with an isopropanol or acetonitrile solvent system. Peptide mapping of trypsin digests of M protein from A/PR/8/34 (H1N1) and A/chicken/Germany/N/49 (H10N7) viruses was identical, whereas Staphylococcus aureus V8 protease digests showed minor differences in at least two peptides. The results also show that HPLC is a powerful tool for the separation of proteolytic digests of viral proteins, since the peptide maps are highly reproducible and recovery was always greater than 85%.

  14. Localization of [3H]nicotine, [3H]cytisine, [3H]epibatidine, and [125I]alpha-bungarotoxin binding sites in the brain of Macaca mulatta.

    Science.gov (United States)

    Han, Zhi-Yan; Zoli, Michele; Cardona, Ana; Bourgeois, Jean-Pierre; Changeux, Jean-Pierre; Le Novère, Nicolas

    2003-06-16

    We determined the localization of [(3)H]nicotine, [(3)H]cytisine, [(3)H]epibatidine, and [(125)I]alpha-bungarotoxin binding sites in the brain of rhesus monkey by means of receptor autoradiography. The labelings by [(3)H]nicotine, [(3)H]cytisine, and [(3)H]epibatidine were highly concordant, except for epibatidine. Layer IV of some cortical areas, most thalamic nuclei, and presubiculum displayed high levels of labeling for the three ligands. Moderate levels of binding were detected in the subiculum, the septum, and the mesencephalon. Low levels were present in layers I-II and VI of the cortex, the cornu Ammonis, the dentate gyrus, and the amygdala. In addition, the level of epibatidine labeling was very high in the epithalamic nuclei and the interpeduncular nucleus, whereas labeling by nicotine and cytisine was very weak in the same regions. The distribution of [(125)I]alpha-bungarotoxin binding differed from the binding of the three agonists. The labeling was dense in layer I of most cortical areas, dentate gyrus, stratum lacunosum-moleculare of CA1 field, several thalamic nuclei, and medial habenula. A moderate labeling was found in layers V and VI of the prefrontal and frontal cortices, layer IV of primary visual cortex, amygdala, septum, hypothalamus, and some mesencenphalic nuclei. A weak signal was also detected in subiculum, claustrum, stratum oriens, and stratum lucidum of cornu Ammonis and also in some mesencephalic nuclei. The distribution of nicotine, cytisine, and epibatidine bindings corresponds broadly to the patterns observed in rodents, with the marked exception of the epithalamus. However, in monkey, those distributions match the distribution of alpha2 messenger RNA, rather than that of alpha4 transcripts as it exists in rodent brains. The distribution of the binding sites for alpha-bungarotoxin is larger in the brain of rhesus monkeys than in rodent brain, suggesting a more important role of alpha7 receptors in primates.

  15. The interaction of /sup 125/I-insulin with cultured 3T3-L1 adipocytes: quantitative analysis by the hypothetical grain method

    Energy Technology Data Exchange (ETDEWEB)

    Fan, J.Y.; Carpentier, J.L.; Van Obberghen, E.; Blackett, N.M.; Grunfeld, C.; Gorden, P.; Orci, L.

    1983-07-01

    The murine 3T3-L1 fibroblast under appropriate incubation conditions differentiates into an adipocyte phenotype. This 3T3-L1 adipocyte exhibits many of the morphologic, biochemical, and insulin-responsive features of the normal rodent adipocyte. Using quantitative electron microscopic (EM) autoradiography we find that, when /sup 125/I-insulin is incubated with 3T3-L1 adipocytes, the ligand at early times of incubation localizes to the plasma membrane of the cell preferentially to microvilli and coated pits. When the incubation is continued at 37 degrees C, /sup 125/I-insulin is internalized by the cells and preferential binding to the villous surface is lost. With the internalization of the ligand, two intracellular structures become labeled, as determined by the method of hypothetical grain analysis. These include large clear, presumably endocytotic, vesicles and multivesicular bodies. Over the first hour of incubation the labeling of these structures increases in parallel, but in the second hour they diverge: the labeling of multivesicular bodies and other lysosomal forms continuing to increase and the labeling of large clear vesicles decreasing. At 3 hours limited but significant labeling occurs in small Golgi-related vesicles that have the typical distribution of GERL. The distinct morphologic features of this cell make it ideal for a quantitative morphologic analysis and allow for an unambiguous view of the sequence of events involved in receptor-mediated endocytosis of a polypeptide hormone. These events are likely to be representative of the processing of insulin by the mature rodent adipocyte.

  16. A modern Monte Carlo investigation of the TG-43 dosimetry parameters for an {sup 125}I seed already having AAPM consensus data

    Energy Technology Data Exchange (ETDEWEB)

    Aryal, Prakash; Molloy, Janelle A. [Department of Radiation Medicine, University of Kentucky, Lexington, Kentucky 40536 (United States); Rivard, Mark J., E-mail: mark.j.rivard@gmail.com [Department of Radiation Oncology, Tufts University School of Medicine, Boston, Massachusetts 02111 (United States)

    2014-02-15

    Purpose: To investigate potential causes for differences in TG-43 brachytherapy dosimetry parameters in the existent literature for the model IAI-125A{sup 125}I seed and to propose new standard dosimetry parameters. Methods: The MCNP5 code was used for Monte Carlo (MC) simulations. Sensitivity of dose distributions, and subsequently TG-43 dosimetry parameters, was explored to reproduce historical methods upon which American Association of Physicists in Medicine (AAPM) consensus data are based. Twelve simulation conditions varying{sup 125}I coating thickness, coating mass density, photon interaction cross-section library, and photon emission spectrum were examined. Results: Varying{sup 125}I coating thickness, coating mass density, photon cross-section library, and photon emission spectrum for the model IAI-125A seed changed the dose-rate constant by up to 0.9%, about 1%, about 3%, and 3%, respectively, in comparison to the proposed standard value of 0.922 cGy h{sup −1} U{sup −1}. The dose-rate constant values by Solberg et al. [“Dosimetric parameters of three new solid core {sup 125}I brachytherapy sources,” J. Appl. Clin. Med. Phys. 3, 119–134 (2002)], Meigooni et al. [“Experimental and theoretical determination of dosimetric characteristics of IsoAid ADVANTAGE™ {sup 125}I brachytherapy source,” Med. Phys. 29, 2152–2158 (2002)], and Taylor and Rogers [“An EGSnrc Monte Carlo-calculated database of TG-43 parameters,” Med. Phys. 35, 4228–4241 (2008)] for the model IAI-125A seed and Kennedy et al. [“Experimental and Monte Carlo determination of the TG-43 dosimetric parameters for the model 9011 THINSeed™ brachytherapy source,” Med. Phys. 37, 1681–1688 (2010)] for the model 6711 seed were +4.3% (0.962 cGy h{sup −1} U{sup −1}), +6.2% (0.98 cGy h{sup −1} U{sup −1}), +0.3% (0.925 cGy h{sup −1} U{sup −1}), and −0.2% (0.921 cGy h{sup −1} U{sup −1}), respectively, in comparison to the proposed standard

  17. The angiotensin hexapeptide 3-8 fragment potently inhibits [125I]angiotensin II binding to non-AT1 or -AT2 recognition sites in bovine adrenal cortex.

    Science.gov (United States)

    Jarvis, M F; Gessner, G W; Ly, C Q

    1992-08-25

    In the present studies, ligand competition experiments were conducted to examine the ability of angiotensin II peptide agonists and nonpeptide AT1- and AT2-selective receptor antagonists to inhibit the binding of [125I]angiotensin II to bovine adrenal cortical membranes. Angiotensin II, angiotensin III, the All-(3-8) hexapeptide fragment of angiotensin II, and the AT1-selective receptor antagonist L-158,809, inhibited [125I]angiotensin II binding in a biphasic fashion indicative of a ligand interaction at more than one recognition site. Approximately 20% of low affinity [125I]angiotensin II binding was inhibited only by high micromolar concentrations of L-158,809. RG 13647 (1(-1,4-benzodioxan-2-methyl)-5-diphenylacetyl-4,5,6,7-tetra hydro-1H-imidazo- [4,5,c]-pyridine-6-carboxylic acid) represents a potent and AT2-selective analog of PD 123177 and showed weak activity in competing for [125I]angiotensin II binding with an IC50 value of 100 microM. When subsequent competition studies were conducted in the presence of 1 microM L-158,809 to block [125I]angiotensin II to the AT1 receptor subtype, the angiotensin II agonists produced monophasic inhibition curves with AII-(3-8) showing the greatest activity (IC50 = 6 nM) followed by angiotensin III (IC50 = 15 nM) much greater than angiotensin II (IC50 = 110 nM). RG 13647 was not found to significantly inhibit this portion of [125I]angiotensin II binding. These data demonstrate that bovine adrenal cortex contains both the AT1 receptor subtype, as well as, a novel class of [125I]angiotensin II recognition sites which may be analogous to the recently described angiotensin IV (AT4) receptor.

  18. Pharmacokinetics of [125I]Huwentoxin-1 after epidural and intravenous administration to rhesus monkeys%猕猴硬膜外及静脉注射[125I]虎纹毒素-1的药代动力学

    Institute of Scientific and Technical Information of China (English)

    廖智; 戴舒佳; 刘秀文; 汤仲明; 梁宋平

    2003-01-01

    目的研究与比较猕猴硬膜外(ed)及静脉(iv)注射虎纹毒素-1后的药代动力学过程.方法 Iodogen法标记虎纹毒素-1,按0.388 MBq*kg-1的剂量向猕猴第3和第4腰椎之间硬膜外腔及静脉注射标记后虎纹毒素-1,用反相高效液相色谱检测猴血清中的药物放射性活度;γ-计数仪检测猴第3和第4腰椎硬膜外腔的药物放射性活度.结果制备了具有生物活性的[125I]虎纹毒素-1. 硬膜外给药10 min后,给药部位局部硬膜外腔的药物放射性占总给药量的0.38,说明硬膜外给药是成功的.硬膜外及静脉给药后,血药浓度分别在30 min和2 min达峰,分别为(0.70±0.04) MBq*L-1 和 (4.98±0.58) MBq*L-1.两种给药途径的药时曲线不同:猕猴硬膜外和静脉给药后,末端T(1)/(2)分别为(10.36±0.27) h和(11.03±1.16) h;ClS分别为(1.29 ± 0.07)L*h-1*kg-1和 (1.25±0.23) L*h-1*kg-1,硬膜外给予[125I]HWTX-1的绝对生物利用度(95±5)%.结论硬膜外和静脉两种给药方式下,[125I]虎纹毒素-1在猕猴体内的药代动力学过程具有差异性,两种给药方式下[125I]在猕猴体内的分布与吸收特点对于虎纹毒素-I的临床药效学和毒理学研究提供了参考数据.%AIM To study and compare pharmacokinetics (PK) after epidural or intravenous (iv) administration of [125I]labeled Huwentoxin-1 ([125I]HWTX-1) in rhesus monkeys. METHODS Huwentoxin-1 was labeled by iodogen method and was administered at a dose of 0.388 MBq*kg-1 by lumbar puncture at the third lumbar (L3) and the forth lumbar (L4) interspaces using a 12-gauge paracentetic needle into epidural space of rhesus monkeys or iv at the same dose. Reverse Phase High Performance Liquid Chromatography (RP-HPLC) determined serum [125I]Huwentoxin-1 with an automatic gamma counter. RESULTS The puriation of [125I]Huwentoxin-1>96% and with the same bio-activity as unlabeled Huwentoxin-1; Radioactivity detected in epidural space was 38% of injected radioactivity at 10 min after

  19. Analysis of Permanent Pacemaker Implantation in Patients with Emotional State Survey and the Effect of Psychological Intervention%永久性起搏器植入患者情绪状态调查与心理干预的效果分析

    Institute of Scientific and Technical Information of China (English)

    李瑶; 解涛

    2015-01-01

    目的:分析永久性起搏器植入患者情绪状态调查和心理干预的效果。方法回顾性分析我院2011年7月-2014年5月收治的47例永久性起搏器植入患者临床资料,调查其情绪状态,借助于焦虑自评量表和抑郁自评量表观察比较干预前后患者情绪状态。结果干预前后患者情绪状态所存差异明显,有统计学意义(P<0.05)。结论永久起搏器植入患者易出现焦虑和抑郁等不良情绪,合理的心理干预可有效缓解和消除患者所存不良情绪。%Objective To analyze the emotional state of patients with permanent pacemaker implantation of investigation and the effect of psychological intervention. Methods A retrospective analysis of our hospital in 2011 July -2014 year in May admitted 47 cases of permanent pacemaker implantation in patients with clinical data,to investigate their emotional state,with the help of the self rating Anxiety Scale and self rating Depression Scale were observed and compared before and after the intervention of the emotional state of patients. Results Before and after the intervention in patients with emotional state stored differences,with statistical significance (P<0.05). Conclusion The permanent pacemaker implantation in patients prone to anxiety and depression and other negative emotions,psychological intervention is reasonable can effectively al eviate and eliminate the bad mood of patients with deposit.

  20. Auger electron emitter against multiple myeloma - targeted endo-radio-therapy with {sup 125}I-labeled thymidine analogue 5-iodo-4'-thio-2'-deoxyuridine

    Energy Technology Data Exchange (ETDEWEB)

    Morgenroth, Agnieszka, E-mail: amorgenroth@ukaachen.de [Nuclear Medicine Clinic, University Ulm, Albert-Einstein-Allee 23, D-89081 Ulm (Germany); Nuclear Medicine Clinic, University Aachen, RWTH, Pauwelsstrasse 30, D-52074 Aachen (Germany); Dinger, Cornelia; Zlatopolskiy, Boris D.; Al-Momani, Ehab; Glatting, Gerhard [Nuclear Medicine Clinic, University Ulm, Albert-Einstein-Allee 23, D-89081 Ulm (Germany); Mottaghy, Felix M. [Nuclear Medicine Clinic, University Aachen, RWTH, Pauwelsstrasse 30, D-52074 Aachen (Germany); Reske, Sven N. [Nuclear Medicine Clinic, University Ulm, Albert-Einstein-Allee 23, D-89081 Ulm (Germany)

    2011-10-15

    Introduction: Multiple myeloma (MM) is a plasma cell malignancy characterized by accumulation of malignant, terminally differentiated B cells in the bone marrow. Despite advances in therapy, MM remains an incurable disease. Novel therapeutic approaches are, therefore, urgently needed. Auger electron-emitting radiopharmaceuticals are attractive for targeted nano-irradiation therapy, given that DNA of malignant cells is selectively addressed. Here we evaluated the antimyeloma potential of the Auger electron-emitting thymidine analogue {sup 125}I-labeled 5-iodo-4'-thio-2'-deoxyuridine ([{sup 125}I]ITdU). Methods: Cellular uptake and DNA incorporation of [{sup 125}I]ITdU were determined in fluorodeoxyuridine-pretreated KMS12BM, U266, dexamethasone-sensitive MM1.S and -resistant MM1.R cell lines. The effect of stimulation with interleukin 6 (IL6) or insulin-like growth factor 1 (IGF1) on the intracellular incorporation of [{sup 125}I]ITdU was investigated in cytokine-sensitive MM1.S and MM1.R cell lines. Apoptotic cells were identified using Annexin V. Cleavage of caspase 3 and PARP was visualized by Western blot. DNA fragmentation was investigated using laddering assay. Therapeutic efficiency of [{sup 125}I]ITdU was proven by clonogenic assay. Results: [{sup 125}I]ITdU was shown to be efficiently incorporated into DNA of malignant cells, providing a promising mechanism for delivering highly toxic Auger radiation emitters into tumor DNA. [{sup 125}I]ITdU had a potent antimyeloma effect in cell lines representing distinct disease stages and, importantly, in cell lines sensitive or resistant to the conventional therapeutic agent, but was not toxic for normal plasma and bone marrow stromal cells. Furthermore, [{sup 125}I]ITdU abrogated the protective actions of IL6 and IGF1 on MM cells. [{sup 125}I]ITdU induced massive damage in the DNA of malignant plasma cells, which resulted in efficient inhibition of clonogenic growth. Conclusion: These studies may provide a

  1. The clinical application of CT-guided argon-helium cryoablation combined with 125 I radioactive particle in treating liver cancer located under the diaphragm%CT 导引下氩氦冷冻消融联合125I 放射粒子植入治疗膈顶部肝癌的临床应用

    Institute of Scientific and Technical Information of China (English)

    左太阳; 杨卫国; 张忠涛; 咸利军; 张秀亮; 马群; 王松

    2015-01-01

    Objective To evaluate the method of CT‐guided argon‐helium cryoablation combined with 125 I radioactive particle in treating liver cancer located under the diaphragm and to discuss the efficacy of this technique .Methods We se‐lected 16 cases of liver cancer located under the diaphragm .All the cases had been diagnosed by 3‐stage CT scanning and confirmed pathologically .The cancer had been treated by argon‐helium cryoablation combined with 125 I radioactive parti‐cle .Results The rate of the decline in serum AFP level and the efficiency after 3‐ ,6‐ ,12‐ ,24‐month treatment were 100% (16/16) ,100% (16/16) ,93 .8% (15/16) ,87 .5% (14/16) and 100% (16/16) ,100% (16/16) ,87 .5% (14/16) , 87.5% (14/16) .The 3‐ ,6‐ ,12‐ ,24‐month survival rates were 100% (16/16) ,100% (16/16) ,100% (16/16) ,93 .8%(15/16) .Conclusion CT‐guided argon‐helium cryoablation combined with 125 I radioactive particle in treating liver cancer located under the diaphragm is an efficient method for increasing the part control and survival rate for liver cancer located under the diaphragm .%目的:探讨 CT 引导下氩氦冷冻消融联合125 I 放射粒子治疗膈顶部肝癌的方法、疗效。方法选择通过3期CT 增强扫描并经穿刺活检病理证实的膈顶部肝癌16例,行 CT 导引下氩氦冷冻消融联合125 I 放射粒子治疗。结果16例膈顶部肝癌患者治疗后3个月、6个月、12个月、24个月 AFP 下降率依次是100%(16/16),100%(16/16),93.8%(15/16),87.5%(14/16),肿瘤局部控制率依次是100%(16/16),100%(16/16),87.5%(14/16),87.5%(14/16)。结论 CT引导下氩氦冷冻消融联合125 I 放射粒子治疗膈顶部肝癌,疗效可靠,是提高治疗局部控制率和生存率的有效方法。

  2. Monte Carlo simulation of the dose distribution around the {sup 125}I model 6711 seed as function of radius of the silver cylinder using the Penelope code; Simulacion por el Metodo de Monte Carlo de la distribucion de dosis alrededor de la semilla de {sup 125}I modelo 6711 en funcion del radio del cilindro de plata usando el codigo Penelope

    Energy Technology Data Exchange (ETDEWEB)

    Nerio, U. [Universidad de Cordoba, Monteria (Colombia); Instituto Nacional de Cancerologia, Bogota (Colombia); Chica, L. [Universidad Nacional de Colombia, Bogota (Colombia); Paul, A. [Universite de la Mediterranee, Marseille (France)

    2004-07-01

    The Monte Carlo method is applied to find the dose rates distribution in tissue around {sup 125} I seeds model 6711 as a function of the silver cylinder radius, R{sub sc} (0.017, 0.021, 0.025, 0.029 and 0.033) cm are used as radius values. It is found here that the dose rate at any point within the tissue decreases as R{sub sc} increases. The relative difference of dose rate that produced by the standard R{sub sc} seed, is less than 5%, for seeds with Rsc between 0.017 and 0.033 cm. (author)

  3. Differential effects of acute and repeated electrically and chemically induced seizures on ( sup 3 H)Nimodipine and ( sup 125 I)omega-conotoxin GVIA binding in rat brain

    Energy Technology Data Exchange (ETDEWEB)

    Gleiter, C.H.; Cain, C.J.; Weiss, S.R.; Post, R.M.; Marangos, P.J. (National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD (USA))

    1989-07-01

    ({sup 3}H)Nimodipine and high-affinity ({sup 125}I)omega-conotoxin GVIA (CgTX) binding were investigated in membranes from rat cerebral cortex, cerebellum, and hippocampus after electrically and chemically induced seizures. Animals were decapitated 30 min after a single electroconvulsive shock (ECS) or lidocaine-induced seizure and 24 h after the last of 10 once-daily ECS or six once-daily lidocaine-induced seizures. After a single ECS, ({sup 3}H)nimodipine and ({sup 125}I)CgTX binding sites decreased in cerebral cortex (by 10% and 17%, respectively). A downregulation of ({sup 3}H)nimodipine binding sites in hippocampus occurred after single and repeated lidocaine-induced seizures (by 24% and 11%, respectively), whereas ({sup 125}I)CgTX binding remained unaltered. An earlier report on changes in ({sup 3}H)nitrendipine binding after chronic ECS in cortex and hippocampus was not confirmed.

  4. Penile Implants

    Science.gov (United States)

    ... the discussion with your doctor. Types of penile implants There are two main types of penile implants: ... might help reduce the risk of infection. Comparing implant types When choosing which type of penile implant ...

  5. The application of MR diffusion-weighted imaging in evaluating the efficacy of 125I seed interstitial brachytherapy for pancreatic carcinomas: an experimental study in vivo%磁共振弥散加权成像在125I粒子组织间植入治疗胰腺癌疗效评估中的应用

    Institute of Scientific and Technical Information of China (English)

    宋琦; 刘玉; 胡曙东; 黄蔚; 王忠敏; 陈克敏; 严福华; 田建明

    2012-01-01

    目的 探讨磁共振(MRI)弥散加权(DWI)成像对125I粒子组织间植入治疗人胰腺癌裸鼠移植瘤疗效的评估价值.方法 将人胰腺癌SW1990细胞株接种于BABL/C裸鼠右下肢旁腹股沟区偏背侧皮下,待瘤体长至8~10 mm进行干预,共有16只裸鼠的成瘤大小适用于实验,分为实验组8只,植入1q粒子,和对照组8只,植入空载粒子.粒子植入前及治疗后2周和2个月时分别行MRI常规扫描及DWI成像.取瘤体标本行组织病理学检查.结果 实验组肿瘤细胞坏死明显,而对照组肿瘤细胞无明显或有少许坏死.裸鼠心、肝、肺、肾及脾脏等组织无明显放射炎症表现.常规MRI成像评价125I粒子治疗胰腺癌疗效的价值有限.DWI显示实验组内整个肿瘤组织的表观弥散系数(ADC)值在治疗前为(0.001 15±0.000 13) mm%,治疗后2周为(0.001 29±0.000 038) mm2/s.治疗后2个月为(0.002 08±0.000 14 )mm2/s,与治疗前相比差异有统计学意义(P<0.05).实验组肿瘤实质区的ADC值亦较治疗前及对照组增高,但低于坏死区ADC值.结论 125I粒子组织间植入治疗人胰腺癌裸鼠移植瘤可导致肿瘤坏死,并对周围脏器是安全的.用常规MRI及DWI成像观察裸鼠皮下移植瘤可行.DWI对疗效评估有重要价值.%Objective To discuss the application of MR diffusion weighted imaging (DWI) in evaluating the efficacy of 125I seed interstitial brachytherapy for human pancreatic carcinoma xenografts in nude mice. Methods The human pancreatic cell line SW1990 was subcutaneously injected into the region that was slightly lateral to the right groin of the nude mice. When the tumor grew up to 8-10 mm in size, the intervention was begun. A total of 16 nude mice with suitable sized tumor were used in this study. Implantation of 125I seeds was used in the mice of study group (n = 8), while implantation of empty seeds was performed in the mice of control group (n = 8). Before seed implantation, as well as at 2

  6. Determination of the intrinsic energy dependence of LiF:Mg,Ti thermoluminescent dosimeters for {sup 125}I and {sup 103}Pd brachytherapy sources relative to {sup 60}Co

    Energy Technology Data Exchange (ETDEWEB)

    Reed, J. L., E-mail: jlreed2@wisc.edu; Micka, J. A.; Culberson, W. S.; DeWerd, L. A. [Department of Medical Physics, University of Wisconsin–Madison, Madison, Wisconsin 53705 (United States); Rasmussen, B. E. [Department of Radiation Oncology, UP Health System Marquette, 580 West College Avenue, Marquette, Michigan 49855 (United States); Davis, S. D. [Department of Medical Physics, McGill University Health Centre, Montreal General Hospital (L5-112), 1650 Cedar Avenue, Montreal, Quebec H3G 1A4 (Canada)

    2014-12-15

    Purpose: To determine the intrinsic energy dependence of LiF:Mg,Ti thermoluminescent dosimeters (TLD-100) for {sup 125}I and {sup 103}Pd brachytherapy sources relative to {sup 60}Co. Methods: LiF:Mg,Ti TLDs were irradiated with low-energy brachytherapy sources and with a {sup 60}Co teletherapy source. The brachytherapy sources measured were the Best 2301 {sup 125}I seed, the OncoSeed 6711 {sup 125}I seed, and the Best 2335 {sup 103}Pd seed. The TLD light output per measured air-kerma strength was determined for the brachytherapy source irradiations, and the TLD light output per air kerma was determined for the {sup 60}Co irradiations. Monte Carlo (MC) simulations were used to calculate the dose-to-TLD rate per air-kerma strength for the brachytherapy source irradiations and the dose to TLD per air kerma for the {sup 60}Co irradiations. The measured and MC-calculated results for all irradiations were used to determine the TLD intrinsic energy dependence for {sup 125}I and {sup 103}Pd relative to {sup 60}Co. Results: The relative TLD intrinsic energy dependences (relative to {sup 60}Co) and associated uncertainties (k = 1) were determined to be 0.883 ± 1.3%, 0.870 ± 1.4%, and 0.871 ± 1.5% for the Best 2301 seed, OncoSeed 6711 seed, and Best 2335 seed, respectively. Conclusions: The intrinsic energy dependence of TLD-100 is dependent on photon energy, exhibiting changes of 13%–15% for {sup 125}I and {sup 103}Pd sources relative to {sup 60}Co. TLD measurements of absolute dose around {sup 125}I and {sup 103}Pd brachytherapy sources should explicitly account for the relative TLD intrinsic energy dependence in order to improve dosimetric accuracy.

  7. Studies of the biogenic amine transporters. VI. Characterization of a novel cocaine binding site, identified with [125I]RTI-55, in membranes prepared from whole rat brain minus caudate.

    Science.gov (United States)

    Rothman, R B; Silverthorn, M L; Baumann, M H; Goodman, C B; Cadet, J L; Matecka, D; Rice, K C; Carroll, F I; Wang, J B; Uhl, G R

    1995-07-01

    Previous studies showed that the cocaine analog [125I]RTI-55 labels dopamine and serotonergic (5-HT) biogenic amine transporters (BATs) with high affinity. Here we characterized [125I]RTI-55 binding to membranes prepared from whole rat brain minus the caudate nuclei. Paroxetine (50 nM) was used to block [125I]RTI-55 binding to 5-HT transporter sites. Initial experiments identified drugs that displaced [125I]RTI-55 binding with moderately low slope factors. Binding surface analysis of the interaction of 3 beta-(4-chlorophenyl)tropan-2 beta-carboxylic acid phenyl ester hydrochloride (RTI-113) and 3 beta-(4-iodophenyl)tropan-2 beta-carboxylic acid phenyl ester hydrochloride (RTI-122) with [125I]RTI-55 binding sites readily resolved two binding sites for [125I]RTI-55 with Kd values of 0.44 nM and 17 nM and Bmax values of 31 and 245 fmol/mg protein. Potent 5-HT and noradrenergic uptake inhibitors had low affinity for both sites. Whereas cocaine, CFT and WIN35,065-2 were 6.0-, 25- and 14-fold selective for the first site, benztropine, PCP and the novel pyrrole, (+-)-(2RS,3aSR,8bRS)-1,2,3,3a,4,8b-hexahydro- 2-benzyl-1-methylindeno-[1,2-b]pyrrole resorcylate [(+-)-HBMP, formerly called (+-)-RTI-4793-14], were moderately selective for the second site. A single binding site with the characteristics of site 1 was resolved using COS cells transiently expressing the cloned rat dopamine transporter. Lesion studies with 6-hydroxydopamine and 5,7-dihydroxytryptamine were conducted to test the hypothesis that site 1 and site 2 are physically distinct. The data showed that these neurotoxins differentially decreased [125I]RTI-55 binding to sites 1 and 2. The differential distribution of sites 1 and 2 in rat brain provides further support for this hypothesis. Viewed collectively, these data show that [125I]RTI-55 labels a novel binding site in rat brain membranes, termed DATsite2, which is not associated with the classic dopamine, serotonin or norepinephrine transporters.

  8. Uptake of 3-[{sup 125}I]iodo-{alpha}-methyl-L-tyrosine into colon cancer DLD-1 cells: characterization and inhibitory effect of natural amino acids and amino acid-like drugs

    Energy Technology Data Exchange (ETDEWEB)

    Shikano, Naoto [Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan)], E-mail: sikano@ipu.ac.jp; Ogura, Masato [Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Okudaira, Hiroyuki [School of Health Sciences, Faculty of Medicine, Kanazawa University, Kanazawa 920-0942 (Japan); Nakajima, Syuichi; Kotani, Takashi [Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Kobayashi, Masato [School of Health Sciences, Faculty of Medicine, Kanazawa University, Kanazawa 920-0942 (Japan); Nakazawa, Shinya [Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Baba, Takeshi; Yamaguchi, Naoto [Center for Medical Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Kubota, Nobuo [Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Iwamura, Yukio [Center for Humanities and Sciences, Ibaraki Prefectural University of Health Sciences, Ami-machi, Inashiki-gun, Ibaraki 300-0394 (Japan); Kawai, Keiichi [School of Health Sciences, Faculty of Medicine, Kanazawa University, Kanazawa 920-0942 (Japan)

    2010-02-15

    Introduction: We examined 3-[{sup 123}I]iodo-{alpha}-methyl-L-tyrosine ([{sup 123}I]IMT) uptake and inhibition by amino acids and amino acid-like drugs in the human DLD-1 colon cancer cell line, to discuss correlation between the inhibition effect and structure. Methods: Expression of relevant neutral amino acid transporters was examined by real-time PCR with DLD-1 cells. The time course of [{sup 125}I]IMT uptake, contributions of transport systems, concentration dependence and inhibition effects by amino acids and amino acid-like drugs (1 mM) on [{sup 125}I]IMT uptake were examined. Results: Expression of system L (4F2hc, LAT1 and LAT2), system A (ATA1, ATA2) and system ASC (ASCT1) was strongly detected; system L (LAT3, LAT4) and MCT8 were weakly detected; and B{sup 0}AT was not detected. [{sup 125}I]IMT uptake in DLD-1 cells involved Na{sup +}-independent system L primarily and Na{sup +}-dependent system(s). Uptake of [{sup 125}I]IMT in Na{sup +}-free buffer followed Michaelis-Menten kinetics, with a K{sub m} of 78 {mu}M and V{sub max} of 333 pmol/10{sup 6} cells per minute. Neutral D- and L-amino acids with branched or aromatic large side chains inhibited [{sup 125}I]IMT uptake. Tyrosine analogues, tryptophan analogues, L-phenylalanine and p-halogeno-L-phenylalanines, and gamma amino acids [including 3,4-dihydroxy-L-phenylalanine (L-DOPA), DL-threo-{beta}-(3,4-dihydroxyphenyl)serine (DOPS), 4-[bis(2-chloroethyl)amino]-L-phenylalanine and 1-(aminomethyl)-cyclohexaneacetic acid] strongly inhibited [{sup 125}I]IMT uptake, but L-tyrosine methyl ester and R(+)/S(-)-baclofen weakly inhibited uptake. The substrates of system ASC and A did not inhibit [{sup 125}I]IMT uptake except L-serine and D/L-cysteine. Conclusions: [{sup 125}I]IMT uptake in DLD-1 cells involves mostly LAT1 and its substrates' (including amino acid-like drugs derived from tyrosine, tryptophan and phenylalanine) affinity to transport via LAT1. Whether transport of gamma amino acid analogues is

  9. In Vivo and In Vitro Binding of Vip3Aa to Spodoptera frugiperda Midgut and Characterization of Binding Sites by 125I Radiolabeling

    Science.gov (United States)

    Chakroun, Maissa

    2014-01-01

    Bacillus thuringiensis vegetative insecticidal proteins (Vip3A) have been recently introduced in important crops as a strategy to delay the emerging resistance to the existing Cry toxins. The mode of action of Vip3A proteins has been studied in Spodoptera frugiperda with the aim of characterizing their binding to the insect midgut. Immunofluorescence histological localization of Vip3Aa in the midgut of intoxicated larvae showed that Vip3Aa bound to the brush border membrane along the entire apical surface. The presence of fluorescence in the cytoplasm of epithelial cells seems to suggest internalization of Vip3Aa or a fragment of it. Successful radiolabeling and optimization of the binding protocol for the 125I-Vip3Aa to S. frugiperda brush border membrane vesicles (BBMV) allowed the determination of binding parameters of Vip3A proteins for the first time. Heterologous competition using Vip3Ad, Vip3Ae, and Vip3Af as competitor proteins showed that they share the same binding site with Vip3Aa. In contrast, when using Cry1Ab and Cry1Ac as competitors, no competitive binding was observed, which makes them appropriate candidates to be used in combination with Vip3A proteins in transgenic crops. PMID:25002420

  10. In vivo and in vitro binding of Vip3Aa to Spodoptera frugiperda midgut and characterization of binding sites by (125)I radiolabeling.

    Science.gov (United States)

    Chakroun, Maissa; Ferré, Juan

    2014-10-01

    Bacillus thuringiensis vegetative insecticidal proteins (Vip3A) have been recently introduced in important crops as a strategy to delay the emerging resistance to the existing Cry toxins. The mode of action of Vip3A proteins has been studied in Spodoptera frugiperda with the aim of characterizing their binding to the insect midgut. Immunofluorescence histological localization of Vip3Aa in the midgut of intoxicated larvae showed that Vip3Aa bound to the brush border membrane along the entire apical surface. The presence of fluorescence in the cytoplasm of epithelial cells seems to suggest internalization of Vip3Aa or a fragment of it. Successful radiolabeling and optimization of the binding protocol for the (125)I-Vip3Aa to S. frugiperda brush border membrane vesicles (BBMV) allowed the determination of binding parameters of Vip3A proteins for the first time. Heterologous competition using Vip3Ad, Vip3Ae, and Vip3Af as competitor proteins showed that they share the same binding site with Vip3Aa. In contrast, when using Cry1Ab and Cry1Ac as competitors, no competitive binding was observed, which makes them appropriate candidates to be used in combination with Vip3A proteins in transgenic crops.

  11. 125 I粒子植入治疗难治性体表恶性肿瘤的局部疗效及临床意义--附105例报告%Local Effects and Clinical Significance of Radioactive 125 I Seed Brachytherapy for Superficial Refractory Neoplasm:a Report of 105 Cases

    Institute of Scientific and Technical Information of China (English)

    雷光焰; 杨得振; 吕卫东; 付改发; 宋养荣; 张曦; 高巍; 刘佳; 刘志刚

    2014-01-01

    Objective To investigate the local efficacy as well as the complications of percutaneous radioactive 125 I seed implantation in the treatment of superficial refractory neoplasm. Methods A total of 105 patients ( 123 lesions ) diagnosed as having superficial refractory neoplasm from April 2003 to April 2013 was retrospectively collected. All patients were treated with percutaneous radioactive 125I seed implantation.Follow-up observations were conducted monthly or bi-monthly by CT scanning. Results The average number of implanted seed was 13.6 in the 105 patients.The local curative effects was as follows: CR 17.1%(21/123), PR 73.9%(91/123), NC 8.9%(11/123).The total effective rate (CR+PR) was 91.1% (112/123).The rate of relief from local pain was 88.8%(87/98).The rate of relief from pressure symptom was 85.7%(18/21).The complication rate was 16.2%(17/105), including bleeding of needle path in 9 cases, tumor rupture in 4 cases, radioactive dermatitis in 2 cases, nerve injury in 1 case, and seed displacement in 1 case. Conclusion Percutaneous radioactive 125 I seed implantation can significantly relieve the local symptoms, being a feasible, safe, and effective method for treating superficial refractory neoplasm.%目的:探讨经皮穿刺放射性125 I粒子植入治疗体表难治性恶性肿瘤的局部疗效和副作用。方法2003年4月~2013年4月对105例(共123个部位)因体表难治性恶性肿瘤出现疼痛及肿瘤压迫等症状行经皮穿刺放射性粒子植入治疗,每1~2个月 CT 复查1次。结果105例共123个部位平均每个部位植入粒子13.6颗。局部疗效:CR 17.1%(21/123),PR 73.9%(91/123),NC 8.9%(11/123),总有效率(CR+PR)91.1%(112/123)。局部疼痛缓解有效率88.8%(87/98),肿瘤压迫症状缓解率85.7%(18/21)。并发症发生率16.2%(17/105):穿刺针道出血9例,治疗后肿瘤破溃4例,放射性皮炎2

  12. Marxism as permanent revolution

    NARCIS (Netherlands)

    van Ree, E.

    2013-01-01

    This article argues that the 'permanent revolution' represented the dominant element in Karl Marx and Friedrich Engels' political discourse, and that it tended to overrule considerations encapsulated in 'historical materialism'. In Marx and Engels's understanding, permanent revolution did not repres

  13. Synthesis and purification of desmethylzopiclone-N-[l brace]3-(4-hydroxy-3-[[sup 125]I]-iodophenyl) proprionamide[r brace], a prosthetic derivative of zoplicone for use in immunoassay

    Energy Technology Data Exchange (ETDEWEB)

    Mannaert, E.; Daenens, P. (Louvain Univ. (Belgium))

    1994-03-01

    Condensation of [[sup 125]I]-Bolton/Hunter reagent with N-desmethylzopiclone lead to the title compound which was isolated and purified by normal phase HPLC, in combination with gamma counting detection. The introduction of the prosthetic group into the tracer precursor was proven by L-SIMS. (author).

  14. Staff dose of hospitalization in the treatment of patients in ophthalmic brachytherapy with 125 I; Dosis al personal de hospitalizacion en el tratamiento de pacientes de braquiterapia oftalmica con I-125

    Energy Technology Data Exchange (ETDEWEB)

    Terron Leon, J. A.; Gomez Palacios, M.; Moreno Reyes, J. C.; Perales Molina, A.

    2013-07-01

    The objective of this work, therefore, has been the evaluation of the dose levels which nursing staff can receive in care for ophthalmic brachytherapy patients treated with 125 I from measurements made on the same, evaluating, in an experimental way, job security following the PR rules laid down for these treatments. (Author)

  15. 125I标记重组人血小板生成素的小鼠体内分布和代谢特征%Study on Distribution and Metabolism of 125I-recombinant Human Thrombopoietin in Mice

    Institute of Scientific and Technical Information of China (English)

    梁婷; 侯桂华; 张超; 宋静

    2007-01-01

    建立了125I标记重组人血小板生成素(rhTPO)的标记方法,并研究其在小鼠体内分布及药物动力学特征,为临床应用提供参考.利用Iodogen法制备125I- rhTPO,纸层析法检测放化纯度,凝胶过滤层析法测定标记率.制备的125I- rhTPO放化纯度为95.85%,标记率为96.25%.尾静脉注射1 μg·kg-1 的125I- rhTPO,在小鼠体内可以二室模型拟合血药浓度的动态变化,T1/2α为0.30 h,T1/2β为6.20 h.125I- rhTPO在小鼠体内主要经肾脏排泄,部分可经肝胆系统代谢.在各骨组织中以富含骨髓细胞的胸骨放射性计数最高,股骨次之,而乏骨髓的胫骨放射性计数最低,提示骨髓是rhTPO作用的靶组织.

  16. (D-Pen2,4 prime -125I-Phe4,D-Pen5)enkephalin: A selective high affinity radioligand for delta opioid receptors with exceptional specific activity

    Energy Technology Data Exchange (ETDEWEB)

    Knapp, R.J.; Sharma, S.D.; Toth, G.; Duong, M.T.; Fang, L.; Bogert, C.L.; Weber, S.J.; Hunt, M.; Davis, T.P.; Wamsley, J.K. (Department of Pharmacology, University of Arizona, College of Medicine, Tucson (United States))

    1991-09-01

    (D-Pen2,4{prime}-125I-Phe4,D-Pen5)enkephalin ((125I)DPDPE) is a highly selective radioligand for the delta opioid receptor with a specific activity (2200 Ci/mmol) that is over 50-fold greater than that of tritium-labeled DPDPE analogs. (125I)DPDPE binds to a single site in rat brain membranes with an equilibrium dissociation constant (Kd) value of 421 {plus minus} 67 pM and a receptor density (Bmax) value of 36.4 {plus minus} 2.7 fmol/mg protein. The high affinity of this site for delta opioid receptor ligands and its low affinity for mu or kappa receptor-selective ligands are consistent with its being a delta opioid receptor. The distribution of these sites in rat brain, observed by receptor autoradiography, is also consistent with that of delta opioid receptors. Association and dissociation binding kinetics of 1.0 nM (125I) DPDPE are monophasic at 25 degrees C. The association rate (k + 1 = 5.80 {plus minus} 0.88 {times} 10(7) M-1 min-1) is about 20- and 7-fold greater than that measured for 1.0 nM (3H) DPDPE and 0.8 nM (3H) (D-Pen2,4{prime}-Cl-Phe4, D-Pen5)enkephalin, respectively. The dissociation rate of (125I)DPDPE (0.917 {plus minus} 0.117 {times} 10(-2) min-1) measured at 1.0 nM is about 3-fold faster than is observed for either of the other DPDPE analogs. The rapid binding kinetics of (125I)DPDPE is advantageous because binding equilibrium is achieved with much shorter incubation times than are required for other cyclic enkephalin analogs. This, in addition to its much higher specific activity, makes (125I)DPDPE a valuable new radioligand for studies of delta opioid receptors.

  17. 125I-β-CIT imaging study of striatal dopamine transporters in mice model of Parkinsonism%帕金森病小鼠模型纹状体多巴胺转运蛋白125I-β-CIT的放射自显影

    Institute of Scientific and Technical Information of China (English)

    刘振国; 翁中芳; 陈生弟; 孙文善; 朱承谟; 沈鸣华

    2001-01-01

    Objective To detect the activity of striatal dopamine transporters (DAT) in lesions of different order of severity of MPTP-induced mice model of parkinsonism by autoradiography with 125I-β-CIT and to evaluate the clinical use of the β-CIT imaging for DAT detection. Methods With regard to the different duration (days) of MPTP treatment, the C57BL mice were randomly divided into 5 groups, that is MPTP 1,3,5 and 7day groups and control group treated with normal saline instead of MPTP. Two hours after intravenous administration with 125I-β-CIT of 148 kBq, the brain tissue sections were imaged by autoradiography. The levels of dopamine (DA) and its metabolites were measured by high performance liquid chromatography and electrochemical detection (HPLC-ECD). The tyrosine hydroxylase (TH)-positive cells and fibres in the substantia nigra and striatum of the mice were observed by means of immunohistochemical technique. Results As compared with control group, the radioactivity ratios of striatum to cortex (ST/CX) in 4 MPTP-treated groups were significantly reduced,by 20%, 42%, 45% and 52%,respectively. The concentrations of DA in the striatum of 4 MPTP-treated groups were remarkably decreased,by 47%, 75%, 95% and 95%,respectively. The gradual loss of DA neurons and fibres in the substantia nigra and striatum in 4 MPTP-treated groups was observed under microscopy. Conclusions The functional abnormality of DAT paralleled the changes observed in neurochemistry and neuropathology studies in the lesions of different order of injury of the MPTP-treated mice. The β-CIT scanning for the activity of DAT may be useful for diagnosing PD at earlier phase and for monitoring the progression of the disease.%目的观察不同损毁程度帕金森病(PD)小鼠模型的纹状体多巴胺转运蛋白(DAT)功能变化,探讨125I-甲基3β-(4-碘苯基)托烷-2β-羧酸盐(β-CIT)DAT显像的价值。方法根据注射MPTP天数不同,分为1,3,5和7 d模型

  18. Excitation functions of 124Te(d,xn)124,125I reactions from threshold up to 14 MeV: comparative evaluation of nuclear routes for the production of 124I.

    Science.gov (United States)

    Bastian, T H; Coenen, H H; Qaim, S M

    2001-09-01

    Excitation functions of the nuclear reactions 124Te(d,xn)124-125I were measured from their respective thresholds up to 14.0 MeV via the stacked-foil technique. Thin samples were prepared by electrolytic deposition of 99.8% enriched 124Te on Ti-backing. The excitation function of the 124Te(d,n)125I reaction was measured for the first time. The present data for the 124Te(d,2n)124I reaction are by an order of magnitude higher than the literature experimental data but are in good agreement with the results of a hybrid model calculation. From the measured cross sections, integral yields of 124,125I were calculated. The energy range Ed = 14 --> 10 MeV appears to be the best compromise between 124I-yield and 1251-impurity. The calculated 124I-yield amounts to 17.5 MBq/microA h and the 125I-impurity to 1.7%. A critical evaluation of the three nuclear routes for the production of 124I, viz. 124Te(d,2n)-, 124Te(p,n)- and 125Te(p,2n)-processes, is given. The reaction studied in this work proved to be least suitable. The 124Te(p,n)-reaction gives 124I of the highest radionuclidic purity, and a small-sized cyclotron is adequate for production purposes. The 125Te(p,2n)-reaction is more suitable at a medium-sized cyclotron: the yield of 124I is four times higher than in the other two reactions but the level of 0.9% 125I-impurity is relatively high.

  19. FAU的碘化标记及其在小鼠体内的生物学分布%Radiolabeling FAU with 125I and its biodistribution in mice

    Institute of Scientific and Technical Information of China (English)

    王瑞华; 曹国祥; 兰晓莉; 何勇; 伍军; 安锐; 张永学

    2007-01-01

    目的 研究125I-氟-碘阿糖呋喃基尿嘧啶(FIAU)的性质及在小鼠体内的生物学分布.方法 利用Iodogen碘化标记法对氟脱氧呋喃糖尿嘧啶(FAU)进行标记,用Sep-Pak C18反相色谱柱进行纯化;观察125I-FIAU的标记率、放化纯、体外稳定性及其在小鼠体内的生物学分布.结果 以Iodogen固相氧化法标记FAU,得到125I-FIAU,标记率为(63.12±5.01)%;产物经Sep-Pak C18反相色谱柱纯化后放化纯为(98.60±O.52)%;125I-FIAU在PBS及人血清中37℃条件下稳定,24 h后放化纯>95.04%.生物学分布实验表明:标记物从小鼠血液中清除迅速,用每克组织百分注射剂量率(%ID/g)表示,O.5 h为(4.33±1.00)%ID/g,2 h下降为(0.77±0.06)%ID/g,至24 h时基本清除完毕;肾脏是其主要排泄器官.结论 Iodogen固相氧化法可以进行FAU碘化标记,得到标记率、放化纯及稳定性较好的125I-FIAU,该标记物主要经肾脏排泄.

  20. Infective endocarditis and risk of death after cardiac implantable electronic device implantation

    DEFF Research Database (Denmark)

    Özcan, Cengiz; Raunsø, Jakob; Lamberts, Morten;

    2017-01-01

    AIMS: To determine the incidence, risk factors, and mortality of infective endocarditis (IE) following implantation of a first-time, permanent, cardiac implantable electronic device (CIED). METHODS AND RESULTS: From Danish nationwide administrative registers (beginning in 1996), we identified all...... de-novo permanent pacemakers (PMs) and implantable cardioverter defibrillators (ICDs) together with the occurrence of post-implantation IE-events in the period from 2000-2012. Included were 43 048 first-time PM/ICD recipients. Total follow-up time was 168 343 person-years (PYs). The incidence rate...

  1. Application of clinical nursing pathway combined with individual case management model in permanent cardiac pacemaker implantation patients%临床护理路径结合个案管理模式在永久性起搏器植入患者中的应用

    Institute of Scientific and Technical Information of China (English)

    熊敏; 许少娜; 郭维英; 林宇洵

    2016-01-01

    Objective To investigate the effect of clinical nursing pathway combinied with individual case management model in permanent cardiac pacemaker implantation patients. Methods A total of 60 patients with perma-nent cardiac pacemaker implantation was selected and divided into an observation group and a control group, with 30 cases in each group. The observation group carried out clinical nursing pathway combined with individual case maneg-ment model, and the control group acceptted the traditional nursing model. The hospitalization days, cases of happening complications, score of disease knowledge questionnaire, patient s' satisfaction and anxiety level of the two groups were compared. Results Compared to the control group, the observation group had fewer hospitalization days and complica-tions, higher score of disease knowledge questionnaire and higher patient satisfaction level (P0. 05), but the anxiety level of observation group obviously lower than that of the control group when discharged from hospital (P0.05),出院时两组比较差异均有统计学意义(P<0.05)。结论在永久性起搏器植入患者中实施临床护理路径与个案管理相结合的模式,可以明显缩短住院天数,减少并发症,提高患者疾病知识掌握程度,提高患者满意度,减轻患者焦虑水平。

  2. Oscillating Permanent Magnets.

    Science.gov (United States)

    Michaelis, M. M.; Haines, C. M.

    1989-01-01

    Describes several ways to partially levitate permanent magnets. Computes field line geometries and oscillation frequencies. Provides several diagrams illustrating the mechanism of the oscillation. (YP)

  3. Serving Deaf Students Who Have Cochlear Implants. PEPNet Tipsheet

    Science.gov (United States)

    Searls, J. Matt, Comp.

    2010-01-01

    Cochlear implants (CIs) are complex electronic devices surgically implanted under the skin behind the ear. These devices utilize electrodes placed in the inner ear (the cochlea) to stimulate the auditory nerve of individuals with significant permanent hearing loss. Cochlear implants may not be suitable for everyone. They are designed to provide…

  4. 1251 seed calibration using afterloading equipment Seed Selectron. Practical solution to meet the recommendations of the AAPM; Calibracion de semillas de {sup 1}25I usando el equipo de carga difereida SeedSelectron. Solucion practica para cumplir las recomendaciones de la AAPM

    Energy Technology Data Exchange (ETDEWEB)

    Perez-Calatayud, J.; Richart, J.; Perez-Garcia, J.; Guirado, D.; Ballester, F.; Rodriguez, S.; Santos, M.; Depiaggio, M.; Carmona, V.; Lliso, F.; Camacho, C.; Pujades, M. C.

    2011-07-01

    Seed Selectron is a system used in the after loader permanent implant brachytherapy seeds 1-125 interstitial prostate. Two aspects are critical when you can meet the recommendations of the AAPM: a practical difficulty to check the quantity of seed required, and the great uncertainty of all measured diodes. The purpose of this paper is to present a practical solution that has been adopted to implement the recommendations of the AAPM.

  5. Synthesis of N,N,-didemethylzolpidem-N-{l_brace}2-{l_brace}3-(4-hydroxy-3-[{sup 125}I] iodophenyl){r_brace}methyl propionate{r_brace} for radioimmunoassay

    Energy Technology Data Exchange (ETDEWEB)

    De Clerck, I.; Daenens, P. [K.U. Leuven (Belgium). Laboratory of Toxicology

    1997-03-01

    The {sup 125}I-derivative of zolpidem was prepared by iodination of a L-tyrosine methyl ester conjugate of a zolpidem precursor. The iodinated compound has been used as a tracer molecule in the development of a radioimmunoassay for zolpidem. It was purified by normal phase HPLC, in combination with gamma counting detection. The structure was confirmed by high resolution L-SIMS. (UK).

  6. Dose Distribution of 125 I Source in Water by Means of Monte Carlo Simulation%125I粒子源在水中剂量分布的Monte Carlo模拟

    Institute of Scientific and Technical Information of China (English)

    梅雪松; 张慧; 马玉刚; 赵广义; 周巍; 庞杨; 关世荣; 王雪航

    2011-01-01

    The dose distribution of 125 I source in water was studied by means of Monte Carlo simulations and thermo luminescent dosemeter (TLD) method, and the results were compared. The results show that when I source activity was 1.37 x107 Bq, the radial distances of 125 I source were 0.5,1.0,1.5 and 2 cm, the dose rates of 125 I with MCNP method were 11.7,3. 3,1.5,0. 8 mGy/h, TLD measurements were 12.2,3. 1,1.3, 0.7 mGy/h;125 I source radial dose rate decreased rapidly with increasing distance.%采用Monte Carlo方法和热释光剂量计(TLD)法研究125I粒子源在水中的剂量分布,并对计算结果进行比较.结果表明:当粒子源活度为1.3 × 107 Bq,粒子源的径向距离分别为0.5,1.0,1.5,2 cm时,用蒙特卡洛方法(MCNP)软件包计算粒子源剂量率分别为11.7,3.3,1.5,0.8 mGy/h,TLD法测量结果分别为12.2,3.1,1.3,0.7 mGy/h; 125I粒子源的径向剂量率随距离增加迅速下降.

  7. Evaluation of the Coat-A-Count sup 125 I fentanyl RIA: Comparison of sup 12 5I RIA and GC/MS-SIM for quantification of fentanyl in case urine specimens

    Energy Technology Data Exchange (ETDEWEB)

    Watts, V.W.; Caplan, Y.H. (Mesa Police Crime Laboratory, AZ (USA))

    1990-09-01

    The Coat-A-Count solid phase {sup 125}I Fentanyl Radioimmunoassay was evaluated with respect to linearity and precision using equine urine fortified with fentanyl and then compared with a gas chromatographic/mass spectrometric method for quantification of fentanyl in urine. The RIA assay was found to be linear over the urine fentanyl concentration range of 0.25 to 7.5 ng/mL and precise with coefficients of variation (CV) ranging from 9.6 to 19.3%. The RIA calibrators, ranging in fentanyl concentrations from 0.25 to 7.5 ng/mL, and controls, at mean fentanyl concentrations of 0.46 and 1.32 ng/mL, were compared by both the RIA and GC/MS methods. The cross-reactivity with the {sup 125}I RIA test was determined for the fentanyl metabolites, norfentanyl and hydroxyfentanyl, and found to be 5% and 35%, respectively. The illicit fentanyl analogs were found to show significant cross-reactivity, ranging from 20 to 100%. The {sup 125}I RIA was compared to GC/MS quantifications of fentanyl in 35 positive and 20 negative case urine specimens.

  8. {sup 125}I-iomazenil binding shows stress- and/or diazepam-induced reductions in mouse brain. Supporting data for {sup 123}I-iomazenil SPECT study of anxiety disorders

    Energy Technology Data Exchange (ETDEWEB)

    Takahashi, Makoto; Odano, Ikuo [Niigata Univ. (Japan). School of Medicine; Fujita, Shozo; Ohkubo, Masaki

    1997-08-01

    Effects of repeated swim stress on the binding of {sup 125}I-iomazenil were examined in the brains of diazepam-treated and non-treated mice. The mice were orally administered diazepam or vehicle (0.5% ethylene glycol) and subjected to daily swim stress (at 20degC for 10 min) for seven consecutive days. The distribution and the amount of {sup 125}I-iomazenil binding were analyzed autoradiographically after in vivo and in vitro binding experiments. Repeated swim stress decreased the in vivo binding in the hippocampus (p<0.05) and cerebral cortex (p<0.05) of vehicle-treated mice but caused no significant changes in diazepam-treated mice. Subchronic treatment with diazepam decreased the in vivo binding approximately 50% in all brain regions examined (p<0.01). The in vitro experiment, however, revealed no significant changes except in the hippocampus, where a small but significant decrease in the binding was observed after subchronic treatment with diazepam (p<0.01). The stress- or diazepam-induced reductions seem to represent alterations in the in vivo environment related to {sup 125}I-iomazenil binding. These results suggest that we can investigate the pathophysiology of stress and anxiety with {sup 123}I-iomazenil SPECT. Care must be taken concerning the effects of benzodiazepines. (author)

  9. Dosimetry of (125)I and (103)Pd COMS eye plaques for intraocular tumors: report of Task Group 129 by the AAPM and ABS.

    Science.gov (United States)

    Chiu-Tsao, Sou-Tung; Astrahan, Melvin A; Finger, Paul T; Followill, David S; Meigooni, Ali S; Melhus, Christopher S; Mourtada, Firas; Napolitano, Mary E; Nath, Ravinder; Rivard, Mark J; Rogers, D W O; Thomson, Rowan M

    2012-10-01

    Dosimetry of eye plaques for ocular tumors presents unique challenges in brachytherapy. The challenges in accurate dosimetry are in part related to the steep dose gradient in the tumor and critical structures that are within millimeters of radioactive sources. In most clinical applications, calculations of dose distributions around eye plaques assume a homogenous water medium and full scatter conditions. Recent Monte Carlo (MC)-based eye-plaque dosimetry simulations have demonstrated that the perturbation effects of heterogeneous materials in eye plaques, including the gold-alloy backing and Silastic insert, can be calculated with reasonable accuracy. Even additional levels of complexity introduced through the use of gold foil "seed-guides" and custom-designed plaques can be calculated accurately using modern MC techniques. Simulations accounting for the aforementioned complexities indicate dose discrepancies exceeding a factor of ten to selected critical structures compared to conventional dose calculations. Task Group 129 was formed to review the literature; re-examine the current dosimetry calculation formalism; and make recommendations for eye-plaque dosimetry, including evaluation of brachytherapy source dosimetry parameters and heterogeneity correction factors. A literature review identified modern assessments of dose calculations for Collaborative Ocular Melanoma Study (COMS) design plaques, including MC analyses and an intercomparison of treatment planning systems (TPS) detailing differences between homogeneous and heterogeneous plaque calculations using the American Association of Physicists in Medicine (AAPM) TG-43U1 brachytherapy dosimetry formalism and MC techniques. This review identified that a commonly used prescription dose of 85 Gy at 5 mm depth in homogeneous medium delivers about 75 Gy and 69 Gy at the same 5 mm depth for specific (125)I and (103)Pd sources, respectively, when accounting for COMS plaque heterogeneities. Thus, the adoption of

  10. Treatment of portal vein tumor thrombus using ~(125)Iodine seed implantation brachytherapy

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    We reported two cases of liver metastasis with portal vein tumor thrombus that developed after liver transplantation for hepato cellular carcinoma (HCC). Both the patients were women aged 43 and 55 years, who had liver metastasis and portal vein tumor thrombus formation after liver transplantations for HCC. For the treatment of portal vein tumor thrombus, 125I seeds were implanted into the hepatic tissue under the guidance of preoperative computed tomography (CT) images with a total radiation dose of 130 Gy...

  11. Permanent pacemaker implantation and follow-up in 23 infants and children with perioperative complete atrioventricular block%23例先天性心脏病患儿围术期永久起博器的植入及随访

    Institute of Scientific and Technical Information of China (English)

    张惠丽; 李守军; 花中东; 杨克明; 胡盛寿; 张浩; 陈柯萍; 华伟

    2014-01-01

    preoperatively and underwent PM implanted during the surgical operation. Twenty patients (3 PECD and total endocardial cushion defect (TECD), 3 ventricular septal defect (VSD), 1Tetralogy of Fallot(TOF), 6 double outlet right ventricle(DORV), 2 transposition of the great arteries(TGA), 5 CTGA) had complete AVB after CHD repair and underwent ENDO or EPI PM implantation 11 to 48 days later. Follow-up data were obtained on the records made in out-patient (symptoms and signs, ECG, x ray, echocardiography and the param-eters of the permanent cardiac pacemakers). Results EPI pacing leads were implanted via midline thoracoectomy and the pulse generator were buried in a subcutaneous pocket on the left abdomen. ENDO pacing systems were implanted via the right (3 cases) or left (4 cases) subclavian vein and the pulse generator were buried in a subcutaneous pocket in the right(3 cases) and left (4 cases)precordial area. No lead fracture and infected wound happened in these patients. Rate-responsive ventricular demand pacing (VVIR) PM were implanted in 1 and VVI in 22 patients. All patients with PM implantation had the range of pacing rate 70~160 (111 ±25.5)bpm, pacing threshold 0.5~0.75 (0.74 ±0.30)V, sensitivity threshold 2.5~2.8 (2.78 ±0.11)mV and lead resistance 271~726 (445.5 ±148.9)Ω. Twenty-one patients were followed-up for 1 month to 5.5years (91.3%21/23) and the pacing threshold were slightly high early after PM implantation and then maintained steady. One patient with TGA had a sudden death 6 months after switch operation and EPI PM implantation without the known eti-ology. One patient with TECD had battery changed 4.5 years after EPI PM implantation. The sinus rhythm recovered in 1 patient with VSD. Cardiomegaly, myocardial dysfunction and left ventricular ejection fraction (LVEF)<50% occurred in 4 patients 6 months to 2 years later after PM implantation. Conclusion The results of this study show that perioperative permanent pacing therapy for complete AVB in infants and

  12. Permanences GAG-EPA

    CERN Multimedia

    GAC-EPA

    2015-01-01

    Le GAC organise chaque mois des permanences avec entretiens individuels. La prochaine permanence se tiendra le : Mardi 5 mai de 13 h 30 à 16 h 00 Salle de réunion de l’Association du personnel Les permanences suivantes auront lieu les mardis 2 juin, 1er septembre, 6 octobre, 3 novembre et 1er décembre 2015. Les permanences du Groupement des Anciens sont ouvertes aux bénéficiaires de la Caisse de pensions (y compris les conjoints survivants) et à tous ceux qui approchent de la retraite. Nous invitons vivement ces derniers à s’associer à notre groupement en se procurant, auprès de l’Association du personnel, les documents nécessaires.

  13. Clinical and dosimetric analysis of 469 prostate cancer patients treated in France in 2005 by permanent implant brachytherapy using the Iodine 125 seeds IsoSeed Bebig: report to the French Economic committee of health products (C.E.P.S.); Analyse clinique et dosimetrique de 469 patients traites en France en 2005 par implantation prostatique de grains d'iode 125 IsoSeed Bebig: rapport pour le Comite economique des produits de sante (CEPS)

    Energy Technology Data Exchange (ETDEWEB)

    Cosset, J.M.; Gomme, S.; Henni, M.; Rosenwald, J.C.; Pontvert, B.; Asselain, D.; Chauveinca, L. [Institut Curie, 75 - Paris (France); Chauveinca, L. [Clinique Hartmann, 92 - Neuilly-sur-Seine (France); Peiffert, D. [Centre Alexis-Vautrin, 54 - Nancy (France); Guerif, S. [CHU de Poitiers, 86 - Poitiers (France); Labib, A. [Centre Rene-Huguenin, 92 - Saint-Cloud (France); Hannoun-Levi, J.M. [Centre Antoine-Lacassagne, 06 - Nice (France); Martin, P. [Polyclinique de Bourgogne, 59 - Lille (France); Quetin, G. [Centre Paul-Strauss, 67 - Strasbourg (France); Nguyen, T.D. [Centre Jean-Godinot, 51 - Reims (France); Flam, T. [Hopital Cochin, 75 - Paris (France); Thiounn, N. [Hopital Necker, 75 - Paris (France); Housset, M. [Hopital Europeen Georges-Pompidou, 75 - Paris (France)

    2007-06-15

    A French decree of February 3. 2005, allowed the Iodine 125 seeds from several companies to be reimbursed after a permanent implantation brachytherapy for a prostate cancer. Within this frame, the French 'Comite economique des produits de sante' (C.E.P.S.; Economic committee for health products) made mandatory the annual writing and publication of a follow-up study with three main aims; make sure that the seeds were used for prostate cancer patients with criteria corresponding to the national recommendations, analyze the quality of the dosimetric data, and report all side effects, complications and possible accidents. We therefore report here a clinical and dosimetric analysis of 469 patient cases treated in France in nine centers in 2005 with the Iodine 125 IsoSeed Bebig. This analysis shows that: 1) The national recommendations for selecting patients for exclusive prostate brachytherapy have been taken into account in 97% of the cases; 2) The dosimetric quality criteria totally fulfilled the recommendations in a large majority of cases; the intra-operative D90 was found to be superior to 145 Gy in 98% of the patients, and the intra-operative V100 was superior to 95% in 96% of the cases; 3) The early toxicity (mainly urinary) was found to be at the lower range of what is reported in the literature, with in particular a retention rate of 2.4%. (autho0008.

  14. Cochlear Implants

    Science.gov (United States)

    A cochlear implant is a small, complex electronic device that can help to provide a sense of sound. People who are ... of-hearing can get help from them. The implant consists of two parts. One part sits on ...

  15. 移动电话对埋藏式永久起搏器干扰的临床研究%Interference of cellular phones on implanted permanent pacemaker

    Institute of Scientific and Technical Information of China (English)

    刘芳; 吕宝经; 陆尚彪; 徐惠芬; 舒红; 方祖祥

    2001-01-01

    目的:研究移动电话对埋藏式永久起搏器的干扰情况。方法:用自身对照法,将国内常用的2种移动电话分别放在3种不同位置及处于不同工作状态下,检测其对埋藏式起搏器的干扰情况。结果:对110例患者共进行1 857次测试,仅1例(0.9%)Biotronic Ergos-01 VVI型起搏器依赖型患者22次(1.2%)出现干扰。干扰只发生在移动电话处于起搏器上,且多出现于铃响阶段。数字机干扰大于模拟机。当移动电话处在正常耳旁位置时未见干扰。结论:目前的埋藏式心脏起搏器对移动电话具有一定的抗干扰能力;起搏器患者在通常耳旁位置使用移动电话是安全的;起搏器依赖型患者最好选用模拟式移动电话。%Objective:To investigate the interference of cellular phones on implanted permannet pacemaker.Mothod:By self-contrasted method,110 patients with implanted pacemakers were interfered by two types of cellular phones in vivo. Each phone was placed at three different position and was in different state of work.Result:Among 1 857 interference tests, which were determined in 110 patients, 22 (1.2%) episodes were demonstrated in only one pacemaker-dependent patient with Biotronic Ergos-01 VVI type. All interference occurred only when the cellular phone was positioned above the pacemaker pocket.The most interference was observed during and before the ringing. Both the digital and analog cellular phone can lead to interference, but the former predominated the latter. No interference was seen when the cellular phone was placed on the ear. Conclusion:It is suggested that the new-generated implanted pacemaker could protect interference from cellular phone, but few patient may be interfered. When they use the cellular phone on one ear in the normal position, patients would be considerably safe.It is better for pacemaker-dependent patients to select the analog cellular phone.

  16. Permanent cardiac pacing in pediatric patients.

    Science.gov (United States)

    Lotfy, Wael; Hegazy, Ranya; AbdElAziz, Osama; Sobhy, Rodina; Hasanein, Hossam; Shaltout, Fawzan

    2013-02-01

    Pediatric pacemaker (PM) implants comprise less than 1 % of all PM implants. This study aimed to investigate permanent cardiac pacing among the pediatric population, identifying different indications and complications of pediatric cardiac pacing, especially focusing on the effect of the pacing sites, the PM lead type, and the indications for pacing. The current work is a cross-sectional study of 103 procedures for permanent PM insertion in pediatric patients between January 2001 and December 2010. The patients were followed up 1, 3, and 6 months after implantation, then every 6 months or as needed. Evaluation included routine clinical examination, electrocardiography, chest X-ray, echocardiography, and a full analysis of the pacing system measurements. The ages of the patients ranged from 0.09 to 12 years (median, 2.3 years). The most common indication for pacing was postoperative complete heart bock, noted in 54 patients (52.4 %). Transvenous endocardial PM insertion was performed in 92 procedures (89.3 %), whereas transthoracic epicardial insertion was performed in 11 procedures (10.7 %). The most common site of pacing was the right ventricular apex (n = 64, 62 %), followed by the right ventricular outflow tract (n = 25, 24.3 %). Transthoracic epicardial PM insertion was associated with a significantly higher percentage and greater severity of complications. In this study, 65 % of the patients with left ventricle (LV) dilation before pacing showed a significant improvement in LV dimensions and function after pacing. This was noted only in those with endocardially inserted PM leads in both the congenital and the postoperative groups regardless of the pacing site. Endocardial PM insertion in children is a safe procedure with fewer complications and a lower ventricular threshold than the epicardial route. Permanent single-chamber right ventricle pacing is safe and can lead to significant improvement in LV function and dimensions. However, long-term follow

  17. Studies of the biogenic amine transporters. VII. Characterization of a novel cocaine binding site identified with [125I]RTI-55 in membranes prepared from human, monkey and guinea pig caudate.

    Science.gov (United States)

    Rothman, R B; Silverthorn, M L; Glowa, J R; Matecka, D; Rice, K C; Carroll, F I; Partilla, J S; Uhl, G R; Vandenbergh, D J; Dersch, C M

    1998-04-01

    [125I]RTI-55 is a cocaine analog with high affinity for dopamine (DA) and serotonin (5-HT) transporters. Quantitative ligand binding studies revealed a novel high affinity [125I]RTI-55 binding site assayed under 5-HT transporter (SERT) conditions which has low affinity for almost all classic biogenic amine transporter ligands, including high affinity 5-HT transporter inhibitors such as paroxetine, but which retains high affinity for cocaine analogs. This site, termed SERT(site2) for its detection under 5-HT transporter conditions (not for an association with the SERT) occurs in monkey caudate, human caudate, and guinea pig caudate membranes, but not in rat caudate membranes. SERT(site2) is distinguished from the DA transporter (DAT) and SERT by several criteria, including a distinct ligand-selectivity profile, the inability to detect SERT(site2) in cells stably expressing the cloned human DAT, and insensitivity to irreversible ligands which inhibit [125I]RTI-55 binding to the DAT and SERT. Perhaps the most striking finding about SERT(site2) is that a wide range of representative antidepressant agents have very low affinity for SERT(site2). The affinity of cocaine for this site is not very different from the concentration cocaine achieves in the brain at pharmacological doses. Viewed collectively with the observation that ligands with high affinity for SERT(site2) are mostly cocaine analogs, these data lead us to speculate that actions of cocaine which differ from those of classic biogenic amine uptake inhibitors may be mediated in part via SERT(site2).

  18. Radiation exposure to operating room staff during prostate brachytherapy using iodine-125 seeds; Exposition radiologique de l'equipe operatoire au cours de curietherapies de prostate par implants permanents d'iode-125

    Energy Technology Data Exchange (ETDEWEB)

    Gagna, G.; Amabile, J.C.; Laroche, P. [Service de protection radiologique des armees (SPRA), 1 bis rue du Lieutenant Raoul Batany, 92141 Clamart Cedex (France); Gauron, C. [Institut national de recherche et de securite (INRS), Departement Etudes et Assistance Medicales, 30 rue Olivier Noyer, 75680 Paris Cedex 14 (France)

    2011-04-15

    The French defense radiation protection service (SPRA) and the French national institute for research and safety (INRS) conducted a joint study to assess the radiation exposure to operating room staff during prostate brachytherapy using iodine-125 seeds at the Val-de-Grace military hospital. The purpose of the study was the assessment of the effective doses, the equivalent doses to the extremities and lens received by a novice team, the different ambient dose equivalent rates measurements and the delineation of areas. After six brachy-therapies, all the recorded doses with whole-body InLight{sup R} OSL and nanoDot{sup R} dosimeters remained below the detection limit for the whole staff. The dose rate measured at the end of implantation by an AT1123{sup R} survey meter is about 170 {mu}Sv/h at the perineum of the patient. The controlled area limit is estimated to be about 20 cm from the patient perineum. From these results, the authors propose recommendations for the categorization of workers, the delineation of areas and the dose monitoring procedures. This study demonstrates that real-time ultrasound-guided trans-perineal prostate brachytherapy delivers low dose to the operators because of the radioactive source characteristics and the instrumentation providing an effective radiation protection for the surgical team. (authors)

  19. Differential cytotoxicity of [123I]IUdR, [125I]IUdR and [131I]IUdR to human glioma cells in monolayer or spheroid culture: effect of proliferative heterogeneity and radiation cross-fire.

    OpenAIRE

    1998-01-01

    Radioiodinated iododeoxyuridine (IUdR) is a novel, cycle-specific agent that has potential for the treatment of residual malignant glioma after surgery. As only cells in S-phase incorporate IUdR into DNA, a major limitation to this therapy is likely to be proliferative heterogeneity of the tumour cell population. Using a clonogenic end point, we have compared the toxicities of three radioiodoanalogues of IUdR--[123I]IUdR, [125I]IUdR and [131I]IUdR--to the human glioma cell line UVW, cultured ...

  20. Effect of permanent pacemaker on mortality after transcatheter aortic valve replacement

    DEFF Research Database (Denmark)

    Engborg, Jonathan; Riechel-Sarup, Casper; Gerke, Oke;

    2017-01-01

    OBJECTIVES: Transcatheter aortic valve implantation (TAVI) is an established treatment for high-grade aortic valve stenosis in patients found unfit for open heart surgery. The method may cause cardiac conduction disorders requiring permanent pacemaker (PPM) implantation, and the long-term effect...

  1. Evaluation and metabolite studies of {sup 125}I- and {sup 123}I-labelled E-(R,R)-IQNP: potential radioligands for visualization of M{sub 1} muscarinic acetylcholine receptors in brain

    Energy Technology Data Exchange (ETDEWEB)

    Bergstroem, Kim A.; Halldin, Christer; Hiltunen, Jukka; Swahn, Carl-Gunnar; Ito, Hiroshi; Ginovart, Nathalie; Hall, Haakan; McPherson, Daniel W.; Knapp, F. F. (Russ); Larsson, Stig; Schnell, Per-Olof; Farde, Lars

    1998-04-01

    A new ligand for the M{sub 1} muscarinic receptor subtype, E-(R,R)-1-azabicyclo[2.2.2]oct-3-yl {alpha}-hydroxy-{alpha}-(1-iodo-1-propen-3-yl)-{alpha}-phenylacetate (E-IQNP), was labelled with {sup 125}I and {sup 123}I for autoradiographic studies on human whole-brain cryosections and SPET studies, respectively, in Cynomolgus monkey. Autoradiography demonstrated E-[{sup 125}I]IQNP binding in M{sub 1} receptor-rich regions such as the neocortex and the striatum. The binding was displaceable by the selective M{sub 1} antagonist biperiden. In vivo single photon emission tomography (SPET) studies with E-[{sup 123}I]IQNP demonstrated a high accumulation of radioactivity in the monkey neocortex. Rapid hydrolysis of the quinuclidinyl ester to the free acid was found to be a major biotransformation route for E-[{sup 123}I]IQNP. The free acid of E-[{sup 123}I]IQNP does not pass the blood-brain barrier, but the plasma concentration was high as compared to the total radioactivity in brain. It is thus necessary to correct for the high concentration of radioactive metabolites in parenchymal blood (CBV) to obtain accurate values for E-[{sup 123}I]IQNP binding in brain.

  2. Clinical effectiveness and safety of domestic 125I plaque irradiation for experimental choroidal melanoma%国产125I巩膜敷贴器治疗兔眼脉络膜黑色素瘤的有效性及安全性研究

    Institute of Scientific and Technical Information of China (English)

    周金琼; 魏文斌; 李彬; 杨文利; 高飞; 李辽青; 杨承勋; 蔡善钰

    2012-01-01

    Background Choroidal melanoma (CM)is the most common primary intraocular tumor,and brachytherapy is one of the most common therapeutic modality in the treatment of the tumor.However,this irradiation approach has not been evaluated in China. Objective The present study was to analyze the effectiveness and safety of domestic 125I plaque irradiation in the treatment of CM. Methods Forty New Zealand albino rabbits were randomized into 5 groups with 8 rabbits 8 eyes (right eyes) in each group.CM models were established in 16 of 40 New Zealand albino rabbits by implanting the rat B16F10 melanoma cell fragments into the suprachoroidal space of right eyes.After 3 weeks,domestic 125I plaque was fixed at the location of CM in the irradiation group 1,and 8 rabbits with CM served as model control group.The clinical effectiveness of 125I plaque for CM was evaluated based on the fundus examination with indirect ophthalmoscopy,B scan ultrasonography,fundus photographs and color Dopplerimaging.Regarding the safety study,domestic 125I plaque was fixed on the normal right cycs of normal rabbits,while the plaques without 125I seeds were used as the sham group.No intervene was performed in the rabbits of blank group.The number of CD4+,CD8+ T cells in peripheral blood was detected by flow cytometry before plaques implanted and on 3,7,15 and 30 days after the plaque was removed.The animals were sacrificed and the eyes were obtained for histology examination.The use of the experimental animals complied with Statement of ARVO. Results After implantation of B16F10 melanoma cell fragments,CM grew steadily and rapidly with the similar size between irradiation group 1 and model control group ( P =0.550).One week after administration of the treatment,tumor size was(0.31±0.07 )cm in irradiation group 1 and (0.85±0.18 )em in the model control group,with the significant difference between them( P=0.001 ).Two week after application of 125I plaque,the size of tumor was smaller than that before

  3. Estudo clínico e epidemiológico de pacientes submetidos a implante de marcapasso cardíaco artificial permanente: comparação dos portadores da doença de Chagas com os de doenças degenerativas do sistema de condução Clinical and epidemiological characteristics of patients with Chagas' disease submitted to permanent cardiac pacemaker implantation

    Directory of Open Access Journals (Sweden)

    Roberto Costa

    2004-06-01

    Full Text Available OBJETIVO: Estudar os pacientes portadores de marcapasso cardíaco artificial permanente, comparando as características clínicas e epidemiológicas dos portadores da doença de Chagas com a dos portadores de doenças degenerativas do sistema de condução. MÉTODO: Foram analisados 57.632 procedimentos cadastrados no Registro Brasileiro de Marcapassos, realizados no período de 1995 a 2003, sendo: 25.648 pacientes portadores da doença de Chagas e 31.984, de doenças degenerativas. A comparação das características dessas populações foi feita pelos testes do Qui-quadrado e t-Student com nível de significância de 5%. RESULTADOS: Houve predomínio da doença de Chagas na região Centro-Oeste, nos implantes iniciais. Nas reoperações, a população chagásica representou maioria também no Sudeste. A idade dos pacientes chagásicos foi 58,6 ± 15,3 e 59,3 ± 14,8 anos, respectivamente para implantes iniciais e reoperações, e, nos não chagásicos, 73,5 ± 12,6 e 73,7 ± 13,5. Não foi notada diferença na distribuição entre os dois sexos. Houve maior ocorrência de síncopes, pré-síncopes e bloqueio atrioventricular com QRS largo nos pacientes chagásicos e de tonturas, insuficiência cardíaca e QRS estreito nos não chagásicos. O modo de estimulação ventricular foi utilizado em 60% e 63% nos implantes iniciais e em 77% e 76% das reoperações, respectivamente para os pacientes chagásicos e não chagásicos. A depleção da bateria por desgaste normal foi o principal motivo para reoperação dos pacientes, tendo ocorrido em 76,1% e 79,6% das reoperações, respectivamente para chagásicos e não chagásicos. CONCLUSÕES: Os dados analisados demonstraram diferenças significativas nas características clínicas e demográficas das populações estudadas.OBJECTIVE: To study patients with permanent cardiac pacemakers, comparing the clinical and epidemiological characteristics of patients with Chagas' disease versus the ones with

  4. Magnesium as Biodegradable Implant Material

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Drawbacks associated with permanent metallic implants lead to the search for degradable metallic biomaterials. Magnesium alloys have been highly considered as Mg has a high biocorrosion potential and is essential to bodies. In this study, corrosion behaviour of pure magnesium and magnesium alloy AZ31 in both static and dynamic physiological conditions (Hank's solution) has been investigated. It is found that the materials degrade fast at beginning, then stabilize after 5 days of immersion. High purity in th...

  5. 治疗计划系统模拟125I粒子周边与中心分布剂量对比研究%Treatment planning system simulation of central and peripheral dose distribution of 125I seeds:a comparison study

    Institute of Scientific and Technical Information of China (English)

    隋爱霞; 于慧敏; 张宏涛; 吴娟; 任菊娜; 高贞; 王娟

    2015-01-01

    Objective To investigate the surrounding and central dosimetric distribution difference of the same activity, same number of 125I seeds. Methods 3D treatment planning system (3D-TPS) was used to separately sketch out 7 cubes with side length of 2 cm, 2.5 cm, 3 cm, 3.5 cm, 4 cm, 4.5 cm and 5 cm;simulations of different tumor sizes were established, into which 125I seeds with activity of 0.5 mCi were respectively loaded. All seeds were distributed at the periphery of the tumor (peripheral group) with the prescribed dose of 145 Gy. The dose volume histogram (DVH) was printed and the 90% of target volume absorbed dose (D90), 90% of prescription dose coverage target volume percentage (V90), the maximum dose and mean dose were determined. Then the seeds in every cube were distributed into the center (central group) and the above parameters were calculated by using the same method. Results The mean D90 of the peripheral and central group was (147.29 ±0.58) Gy and (106.08 ±9.40) Gy respectively, the difference between the two groups was statistically significant (t=-4.292, P=0.005). The mean V90 of the peripheral and central group was (95.46±0.44)% and (79.07±4.19)% respectively, the difference between the two groups was statistically significant (t=-3.831, P=0.009). The mean maximum dose of the peripheral and central group was (1 224.65 ±12.7) Gy and (1 532.48 ±48.54) Gy respectively, the difference between the two groups was statistically significant (t=6.823, P=0.000). The mean value of average dose of the peripheral and central group was (192.14 ±2.89) Gy and (179.81 ±5.40) Gy respectively, the difference between the two groups was statistically significant (t=-2.847, P=0.029). Conclusion The dose distribution is directly influenced by the distribution pattern of the 125I seeds. When the number and activity of the 125I seeds are the same, the peripheral seeds implantation has a better dose distribution.%目的:探讨同活度、同数量125I粒子周边分

  6. Reevaluation of the AAPM TG-43 brachytherapy dosimetry parameters for an 125I seed, and the influence of eye plaque design on dose distributions and dose-volume histograms

    Science.gov (United States)

    Aryal, Prakash

    The TG-43 dosimetry parameters of the Advantage(TM) 125I model IAI-125A brachytherapy seed were studied. An investigation using modern MCNP radiation transport code with updated cross-section libraries was performed. Twelve different simulation conditions were studied for a single seed by varying the coating thickness, mass density, photon energy spectrum and cross-section library. The dose rate was found to be 6.3% lower at 1 cm in comparison to published results. New TG-43 dosimetry parameters are proposed. The dose distribution for a brachytherapy eye plaque, model EP917, was investigated, including the effects of collimation from high-Z slots. Dose distributions for 26 slot designs were determined using Monte Carlo methods and compared between the published literature, a clinical treatment planning system, and physical measurements. The dosimetric effect of the composition and mass density of the gold backing was shown to be less than 3%. Slot depth, width, and length changed the central axis (CAX) dose distributions by < 1% per 0.1 mm in design variation. Seed shifts in the slot towards the eye and shifts of the 125I-laden silver rod within the seed had the greatest impact on the CAX dose distribution, changing it by 14%, 9%, 4.3%, and 2.7% at 1, 2, 5, and 10 mm, respectively, from the inner scleral surface. The measured, full plaque slot geometry delivered 2.4% +/- 1.1% higher dose along the plaque's CAX than the geometry provided by the manufacturer and 2.2%+/-2.3% higher than Plaque Simulator(TM) (PS) treatment planning software (version 5.7.6). The D10 for the simulated tumor, inner sclera, and outer sclera for the measured slot plaque to manufacturer provided slot design was 9%, 10%, and 19% higher, respectively. In comparison to the measured plaque design, a theoretical plaque having narrow and deep slots delivered 30%, 37%, and 62% lower D 10 doses to the tumor, inner sclera, and outer sclera, respectively. CAX doses at --1, 0, 1, and 2 mm were also

  7. Permanent magnet design methodology

    Science.gov (United States)

    Leupold, Herbert A.

    1991-01-01

    Design techniques developed for the exploitation of high energy magnetically rigid materials such as Sm-Co and Nd-Fe-B have resulted in a revolution in kind rather than in degree in the design of a variety of electron guidance structures for ballistic and aerospace applications. Salient examples are listed. Several prototype models were developed. These structures are discussed in some detail: permanent magnet solenoids, transverse field sources, periodic structures, and very high field structures.

  8. Lawful Permanent Residents - Annual Report

    Data.gov (United States)

    Department of Homeland Security — A lawful permanent resident (LPR) or 'green card' recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  9. Percutaneous implantation of (125)iodine seeds for treatment of portal vein tumor thrombosis in hepatocellular carcinoma.

    Science.gov (United States)

    Liu, Yan; Liu, Ruibao; Wang, Ping; Li, Shijie; Shen, Haiyang

    2015-08-01

    The aim of the study is to evaluate the practicability and therapeutic efficacy of (125)iodine seeds implantation percutaneously for portal vein tumor thrombosis (PVTT) in patients with hepatocellular carcinoma (HCC). Nineteen patients with HCC accompanied with PVTT received ultrasound-guided implantation of 8-30 (125)iodine seeds, 8 mm apart within the portal vein tumor thrombi. The patients were followed up postoperatively for a period of 3-22 months. The successful rates of the procedure, postoperative changes of liver and renal function, hemogram, complications and therapeutic response were monitored. (125)I seeds were successfully implanted in the portal veins in all patients without serious complications. During the follow-up period, the portal vein tumor thrombi all shrunk obviously. Percutaneous implantation of (125)iodine seeds into the portal vein is an effective and safe treatment for PVTT accompanying HCC.

  10. Permanent cardiac pacemaker in infants and children.

    Science.gov (United States)

    Dasmahapatra, H K; Jamieson, M P; Brewster, G M; Doig, B; Pollock, J C

    1986-08-01

    Between October 1970 and November 1984, 26 infants and children aged 11 days to 18 years (mean 5.7 years) received 42 permanent cardiac pacemakers (26 primary implants, 16 re-implants) for congenital or surgically acquired heart block, bradycardia and sinus node dysfunction. Twenty-two patients had unipolar pacing and 4 bipolar pacing. Of 26 primary implantations, 2 had fixed rate epicardial pacing, 16 ventricular demand pacing (13 epicardial, 3 endocardial), 3 epicardial VAT (P-synchronous) pacing and 5 DDD (universal) pacing (4 epicardial, one endocardial). Fourteen patients required a further 19 operations for change of generators (16), ventricular lead (1), generator site (1) and generator encasing (1). Thirty-day hospital mortality was 11.5% (3/26), of which one death was possibly related to pacing failure. Four patients died during the follow-up period (3 months to 10 years; mean 3.4 years). Sixteen of the 19 survivors achieved complete symptomatic relief, without any medical therapy. Our results indicate that modern cardiac pacemaker systems are safe and reliable, and are associated with major relief of symptoms in this age group.

  11. Pathophysiologic effects of stable iodine used as a thyroidal blocking agent to reduce thyroid radiation exposure. Progress report, November 1, 1975--October 31, 1976. [/sup 125/I tracer technique

    Energy Technology Data Exchange (ETDEWEB)

    Becker, D.V.; Hurley, J.R.

    1976-01-01

    In an effort to determine whether iodide administration in man can induce injury to thyroid follicular cells similar to that demonstrated in lower animals, this study measures thyroglobulin, thyroxine and triiodothyronine and thyroid autoantibodies in the serum before and after administration of iodine in a variety of patients. In the last eight months primary efforts have been devoted to the development of a high specificity and sensitivity radioimmunoassay of thyroglobulin and its preliminary clinical application. Human thyroglobulin obtained from operative specimens was purified and its identity and purity established. Rabbits were injected with thyroglobulin for 30 weeks with the appearance of significant titres of antibodies within 6 weeks. The antibody developed was examined for immunological purity and used in a radioimmunoassay system with thyroglobulin labeled in this Laboratory with /sup 125/I.

  12. Shielding property of different prosthetic materials to shield radiation of 125I seed%基托材料对125I粒子屏蔽效果的初步研究

    Institute of Scientific and Technical Information of China (English)

    白阳; 王燕一; 张蕾; 步荣发

    2011-01-01

    目的 探讨应用赝复体或修复体承载 125I粒子进行肿瘤治疗时,不同修复材料对 125I粒子辐射的屏蔽作用.方法 125I粒子为放射源,用热释光剂量元件进行测量,建立体外照射模型.载体选用纯钛板、钴铬合金板、聚甲基丙烯酸甲酯板,以铅板为对照,比较各种材料板的屏蔽效果.结果 在距离放射源10 mm处,经屏蔽后剂量分别为0.09 mm纯钛板2.805 mGy,0.48 mm钛板1.082 mGy,0.410、0.671 mm钴铬合金板为0.390、0.261 mGy,1.685 mm聚甲基丙烯酸甲酯板为2.885 mGy.结论 钴铬合金的屏蔽效果优于其他材料,聚甲基丙烯酸甲酯对 125I粒子具有一定屏蔽作用,与0.557 mm以上钛板共用可达到铅板防护效果.%Objective To investigation the shielding property to 125I of several different prosthetic materials used in clinical when prostheses are used as carriers of 125I seed in tumor treatment. Methods125I seeds were taken as the radiation sources to establish a model in vitro and the radiation doses were measured by thermoluminescent dosemeters(TLD). The shielding property of titanium plate, cochrome plate, and poly methyl methacrylate(PMMA) plate were detected, calculated and compared with that of plumbum plate in the control group. Results The radiation doses of the radiation source at 10 mm distance through the following materials were measured, and the results are 2.805 mGy (0.09 mm thick titanium plate), 1.082 mGy (0.48 thick titanium plate),0.390 mGy (0.41 mm thick cochrome plate), and 0.261 mGy (0.67 mm′s cochrome plate), and 2.885 mGy (1.685 mm thick PMMA plate). ConclusionsThe shield property of cochrome is optimal. The poly methyl methacrylate behaves to some extend as a shield to the 125I seed which can shield the radiation as the effects of plumbum when adopted together with the 0.557 mm′s(or more)titanium plate.

  13. 特异性溶瘤重组腺病毒KH901的碘标记方法及其生物学分布%Iodination Conditions of KH901, a Tumor-specific Oncolytic Recombinant Adenovirus, and Its ~(125)I-labeled Compounds Biodistribution in Animals

    Institute of Scientific and Technical Information of China (English)

    米彦霞; 李云春; 龙亚红; 解朋

    2009-01-01

    研究一种~(125)I直接标记特异性溶瘤重组腺病毒KH901的简便高效的方法,以及评价~(125)I-KH901的体内生物学行为.采用N-溴代琥珀酰亚胺(NBS)方法对KH901进行标记,确定最佳标记条件;用凝胶过滤层析法对标记物进行分离纯化,纸层析法测定放化纯度.对~(125)I-KH901进行正常小鼠体内生物学分布检测.结果显示,~(125)I-KH901的放化纯达到95%以上,标记率可达到78%;正常小鼠尾静脉注射~(125)I-KH901后体内分布显示肝脏中放射性浓集度最高,24 h检测肝脏仍有较多放射性滞留,可达13.34 %ID/g,标记物在肾脏的摄取也较高,为8.06% ID/g. 因此, N-溴代琥珀酰亚胺(NBS)方法是一种步骤简便、标记率高的比较理想的碘标记病毒方法,~(125)I-KH901主要分布在肝脏和肾脏.%In this research was developed high efficiency method using ~(125)I for directly labeling KH901,a tumor-specific oncolytic recombinant adenovirus,biodistribution of ~(125)I-labeled compound in normal mice was investigated. ~(125)I-KH901 was prepared by N-bromosuccinimide labeling method to find the optimal ratio of labeling response. The compounds were isolated and purified by Sephadex-G10 agarose and the radiochemical purity of compounds was analyzed by paper chromatography. The radioactivity biodistribution in mice was measured at different times after caudal vein injection with 0.1ml ~(125)I-KH901. The labeling yield of ~(125)I-KH901 was 78% and the radiochemical purity was 95% after purification by Sephadex-G10 agarose. Biodistribution revealed that the uptake of ~(125)I-KH901 in liver was higher than in other organs at all time points of the experiment. ~(125)I-KH901 was mainly concentrated in liver,kidneys,spleen and lung. It can be seen that N-bromosuccinimide labeling method is an optimal method with simple steps and high labeling yield in labeling KH901 with ~(125)I. ~(125)I-KH901 has a biodistribution trait which is an advantage to treating liver

  14. Diffusion of HTO, {sup 36}Cl{sup -}, {sup 125}I{sup -} and {sup 22}Na{sup +} in Opalinus Clay: Effect of Confining Pressure, Sample Orientation, Sample Depth and Temperature

    Energy Technology Data Exchange (ETDEWEB)

    Van Loon, L.R.; Soler, J.M

    2004-02-01

    Effective diffusion coefficients (D{sub e}), rock capacity factors ({alpha}) and diffusion-accessible porosities ({epsilon}) were measured using the through-diffusion technique. Transport (diffusion) was measured both perpendicular and parallel to the bedding. Special cells that allowed the application of an axial confining pressure were designed. The pressures applied ranged from 1 to 5 MPa for Mont Terri samples and between 4 and 15 MPa for Benken samples, the upper values representing the in-situ confining pressure at both locations. The test solutions used in the experiments were synthetic Opalinus Clay pore water, which has Na and Cl as main components (Mont Terri: I = 0.39 M; Benken: I = 0.20 M). Pressure only had a small effect on the value of the effective diffusion coefficients. In the case of Mont Terri samples, increasing the pressure from 1 to 5 MPa resulted in a decrease of the effective diffusion coefficient of 20% for HTO, 27% for {sup 36}Cl{sup -}, 29% for {sup 125}I{sup -} and 17 % for {sup 22}Na{sup +}. In the case of Benken samples, increasing the pressure from 4 to 15 MPa resulted in a decrease of D{sub e} of 17% for HTO, 22% for {sup 36}Cl{sup -}, 32% for {sup 125}I{sup -} and 17 % for {sup 22}Na{sup +}. Moreover, the effective diffusion coefficients for for {sup 36}Cl{sup -}are smaller than for HTO, which is consistent with an effect arising from anion exclusion. This ion exclusion effect is smaller in samples from Mont Terri than in samples from Benken, which can be explained by the higher ionic strength of the Mont Terri water used in the experiments. The diffusion of {sup 22}Na{sup +} is similar to that of HTO in the case of Mont Terri OPA. For Benken OPA, the D{sub e} value of {sup 22}Na{sup +} is a factor of 2 higher than that of HTO. This last observation cannot be explained so far but is comparable to experimental data from ANDRA (1999) on Callovo-Oxfordian claystones from the Meuse/Haute Same site. {sup 125}I{sup -} is retarded with

  15. Diffusion of HTO, {sup 36}Cl{sup -}, {sup 125}I{sup -} and {sup 22}Na{sup +} in Opalinus Clay: Effect of Confining Pressure, Sample Orientation, Sample Depth and Temperature

    Energy Technology Data Exchange (ETDEWEB)

    Van Loon, L.R.; Soler, J.M

    2004-02-01

    Effective diffusion coefficients (D{sub e}), rock capacity factors ({alpha}) and diffusion-accessible porosities ({epsilon}) were measured using the through-diffusion technique. Transport (diffusion) was measured both perpendicular and parallel to the bedding. Special cells that allowed the application of an axial confining pressure were designed. The pressures applied ranged from 1 to 5 MPa for Mont Terri samples and between 4 and 15 MPa for Benken samples, the upper values representing the in-situ confining pressure at both locations. The test solutions used in the experiments were synthetic Opalinus Clay pore water, which has Na and Cl as main components (Mont Terri: I = 0.39 M; Benken: I = 0.20 M). Pressure only had a small effect on the value of the effective diffusion coefficients. In the case of Mont Terri samples, increasing the pressure from 1 to 5 MPa resulted in a decrease of the effective diffusion coefficient of 20% for HTO, 27% for {sup 36}Cl{sup -}, 29% for {sup 125}I{sup -} and 17 % for {sup 22}Na{sup +}. In the case of Benken samples, increasing the pressure from 4 to 15 MPa resulted in a decrease of D{sub e} of 17% for HTO, 22% for {sup 36}Cl{sup -}, 32% for {sup 125}I{sup -} and 17 % for {sup 22}Na{sup +}. Moreover, the effective diffusion coefficients for for {sup 36}Cl{sup -}are smaller than for HTO, which is consistent with an effect arising from anion exclusion. This ion exclusion effect is smaller in samples from Mont Terri than in samples from Benken, which can be explained by the higher ionic strength of the Mont Terri water used in the experiments. The diffusion of {sup 22}Na{sup +} is similar to that of HTO in the case of Mont Terri OPA. For Benken OPA, the D{sub e} value of {sup 22}Na{sup +} is a factor of 2 higher than that of HTO. This last observation cannot be explained so far but is comparable to experimental data from ANDRA (1999) on Callovo-Oxfordian claystones from the Meuse/Haute Same site. {sup 125}I{sup -} is retarded with

  16. Computed tomographic-guided iodine-125 interstitial implants for malignant thoracic tumors

    Energy Technology Data Exchange (ETDEWEB)

    Huang, Qiming [The Department of Radiology, First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou 350005 (China); The Department of Radiology, Second Affiliated Hospital of Fujian Medical University, 34 Zhongshan Bei Road, Quanzhou 362000 (China); Chen, Jin; Chen, Qunlin [The Department of Radiology, First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou 350005 (China); Lai, Qingquan; Cai, Siqing [The Department of Radiology, Second Affiliated Hospital of Fujian Medical University, 34 Zhongshan Bei Road, Quanzhou 362000 (China); Luo, Kaidong [The Department of Radiology, Longyan Hosptial of Traditional Chinese Medical, 59 Longteng Middle Road, Longyan 364000 (China); Lin, Zhengyu, E-mail: linsinlan@yahoo.com.cn [The Department of Radiology, First Affiliated Hospital of Fujian Medical University, 20 Chazhong Road, Fuzhou 350005 (China)

    2013-11-01

    Purpose: To evaluate the feasibility and efficacy of percutaneous interstitial brachytherapy using iodine-125 ({sup 125}I) radioactive seeds under computed tomographic (CT) guidance for malignant thoracic tumors. Materials and methods: Forty-one patients (34 males, 7 females; 18–90 years; mean, 63.7 years) with 77 lesions (3 in the mediastinum, 7 in the chest wall, 67 in the lung) underwent percutaneous interstitial implantation of {sup 125}I radioactive seeds under CT guidance. A treatment planning system (TPS) was employed to calculate the number and distribution of seeds preoperatively. An 18-G needle was inserted into the lesions under CT guidance and send the seeds according to TPS. Two patients with mediastinal lesions undergoing seed implantation received an artificial pneumothorax. One patient with lung carcinoma adjacent to the anterior mediastinum underwent seed implantation through the sternum. Follow-up CT was done every 2 months postoperatively. Results: The procedure was successful in all patients. No major procedure-associated death occurred. The mean duration of follow-up was 19.4 ± 1.3 months (3–49 months). A complete response (CR) was seen in 49 lesions (63.6%), partial response (PR) in 9 lesions (11.7%), stable disease (SD) in 12 lesions (12.8%), and progressive disease (PD) in 7 lesions (7.4%). The overall response rate (CR + PR) was 75.3%; the local control rate (CR + PR + SD) was 90.9%. The 1-, 2- and 3-year progression-free rates for local tumors were 91%, 88% and 88%, respectively. The 1-, 2- and 3-year survival rates were 87%, 74% and 68%, respectively. Conclusion: Implantation of CT-guided {sup 125}I seeds is feasible and effective for patients with malignant thoracic tumors.

  17. 能谱CT早期评价125I粒子植入治疗胰腺癌效果实验研究%Application of spectral CT imaging in making early evaluation of the effect of 125I particle interstitial brachytherapy for pancreatic carcinoma: an experimental study

    Institute of Scientific and Technical Information of China (English)

    胡曙东; 谌业荣; 刘玉; 宋琦; 林晓珠; 王忠敏; 陈克敏

    2015-01-01

    Objective To discuss the application of spectral CT imaging in evaluating the early therapeutic response of 125I seed interstitial brachytherapy for pancreatic carcinoma in experimental nude mice.Methods BxPC-3 human pancreatic cancer cell xenografts were subcutaneously inoculated at the dorsal part of the limbs in 16 BABL/c nude mice. When the tumor developed to the size of 1-1.5 cm, the tumor-bearing mice were randomly divided into the study group (n=8,receiving implantation of 125I seeds of 1.0 mCi) and the control group (n=8,receiving implantation of ghost shell particles of 0 mCi). Two weeks after the procedure, plain spectral CT scan as well as enhanced multiphase (10 s, 25 s and 60 s) spectral CT scan were performed to obtain multi-phasic image series. The contrast-to-noise ratio (CNR) and iodine concentration (IC) inside the lesions were determined, and the normalized iodine concentrations (nIC) of tumor were thus obtained. Immunohistochemical staining of tumor was used to measure microvessel density (MVD) within the tumor;the correlation between nIC and MVD was analyzed. Results The lesion's nICs measured on each of three phases (10 s,25 s and 60 s) in the study group were lower than those in the control group, the differences were statistically significant (P<0.05). MVD count in the study group was lower than that in the control group, the difference was statistically significant (t=5.957,P<0.01). A parallel linear correlation existed between nIC obtained from each phase of three phases and MVD count (r=0.63,P<0.000 1;r=0.51,P=0.002;and r=0.48,P=0.001 7 for 10 s, 25 s and 60 s phases respectively). Conclusion Spectral CT imaging is an effective method for evaluating the therapeutic effect of 125I seed interstitial brachytherapy for pancreatic carcinoma of experimental mice.%目的 探讨能谱CT成像早期评价 125I粒子组织间植入治疗胰腺癌效果的应用价值.方法 人原位胰腺癌BxPC-3细胞株接种于16只BABL/c裸

  18. Pulsars: Cosmic Permanent 'Neutromagnets'?

    CERN Document Server

    Hansson, Johan

    2011-01-01

    We argue that pulsars may be spin-polarized neutron stars, i.e. cosmic permanent magnets. This would simply explain several observational facts about pulsars, including the 'beacon effect' itself i.e. the static/stable misalignment of rotational and magnetic axes, the extreme temporal stability of the pulses and the existence of an upper limit for the magnetic field strength - coinciding with the one observed in "magnetars". Although our model admittedly is speculative, this latter fact seems to us unlikely to be pure coincidence.

  19. Permanence can be Defended.

    Science.gov (United States)

    McGee, Andrew; Gardiner, Dale

    2017-03-01

    In donation after the circulatory-respiratory determination of death (DCDD), the dead donor rule requires that the donor be dead before organ procurement can proceed. Under the relevant limb of the Uniform Determination of Death Act 1981 (USA), a person is dead when the cessation of circulatory-respiratory function is 'irreversible'. Critics of current practice in DCDD have argued that the donor is not dead at the time organs are procured, and so the procurement of organs from these donors violates the dead donor rule. We offer a new argument here in defence of current DCDD practice, and, in particular, of the interpretation of the requirement of 'irreversibility' as permanence.

  20. Diagnostic Imaging for Dental Implant Therapy

    Directory of Open Access Journals (Sweden)

    Aishwarya Nagarajan

    2014-01-01

    Full Text Available Dental implant is a device made of alloplastic (foreign material implanted into the jaw bone beneath the mucosal layer to support a fixed or removable dental prosthesis. Dental implants are gaining immense popularity and wide acceptance because they not only replace lost teeth but also provide permanent restorations that do not interfere with oral function or speech or compromise the self-esteem of a patient. Appropriate treatment planning for replacement of lost teeth is required and imaging plays a pivotal role to ensure a satisfactory outcome. The development of pre-surgical imaging techniques and surgical templates helps the dentist place the implants with relative ease. This article focuses on various types of imaging modalities that have a pivotal role in implant therapy.

  1. Influences of temperature, incubation time and angiostatin concentration on internalization of its receptor in ECV304 cells%温度时间及125I-AS浓度对ECV304细胞AS受体内化的影响

    Institute of Scientific and Technical Information of China (English)

    张王峰; 徐海峰; 周润锁; 袁梦晖; 周飞华; 孙涛; 赵华栋

    2008-01-01

    目的 探讨温度、时间及125碘-血管抑素(125I-angiostatin,125I-AS)浓度等因素对人脐静脉内皮细胞系ECV304细胞血管抑素(angiostafin,AS)受体内化的影响.方法 利用弹性蛋白酶有限水解法制备AS,SDS-PAGE凝胶电泳鉴定,Ch-T法进行125I标记,纸层析法测标记率,Sephadex-G50柱纯化,将纯化产物分别加入牛血清白蛋白(BSA)、生理盐水及不同物质的量比的半胱氨酸,以观察其体外稳定性.利用放射性配基结合分析法,以125I-As为放射性配基,于4、24、37℃条件下,固定浓度125I.As与ECV304细胞共同保温不同时间后,分别检测细胞的受体内化率;37℃条件下,不同浓度125I-As与ECV304细胞共同保温不同时间后,分别检测细胞的受体内化率.结果 蛋白水解产物凝胶电泳相对分子质量为38×103,标记率可达85%,标记产物在体外较稳定.4℃时,受体内化率较低,24℃时,受体内化率有所增加,37℃时,受体内化率较高;37℃时,随125I-As浓度增大,受体内化率降低(P<0.01);不同温度、浓度时,受体内化率均随时间延长而增加(P<0.01,P<0.05).结论 ECV304细胞AS受体内化受温度、时间及125I-AS浓度等因素影响,呈温度-效应、时间-效应关系,与125I-AS浓度呈负相关.

  2. Nursing Care of a Case of Radioactive Skin Damage Nursing in Combination with Foam Dressings and Hydrocolloid Dressings in a Permanent Pacemaker Implantation%1例放射性皮肤损伤联合泡沫敷料、水胶体敷料治愈的报道

    Institute of Scientific and Technical Information of China (English)

    牛娟; 王雪; 徐美桃

    2016-01-01

    ABSTRACT:Objective To report a case of radioactive skin damage nursing in combination with foam dressings and hydrocolloid dressings in a permanent pacemaker implantation was. Method Two irregular radioactivity skin damages were appeared on the left shoulder after surgery, foam dressings and hydrocolloid dressings were chosen for speciifc nursing, at the same time strengthen the foundation care. Result After ten days intensive care, the radioactivity skin damage was cured. Conclusion Radioactive skin injury is not an individual case, which seriously affects the quality of life of patients, bring great pain to the patient, if the patient developed radiation-induced skin injury,it should give positive nursing measures, select the appropriate dressing ,give the skin nursing and mental nursing, body position nursing and discharge guidance, in order to promote early rehabilitation of patients.%目的:报告1例永久起搏器植入术后放射性皮肤损伤联合泡沫敷料、水胶体敷料的护理。方法患者术后出现左侧肩部两处不规整放射性皮肤损伤,为其选择泡沫敷料、水胶体敷料进行针对性护理,同时加强患者的基础护理。结果经过10天的精心护理,患者的放射性皮肤损伤得以治愈。结论放射性皮肤损伤并非个案,其严重影响了患者的生活质量,给患者带来了极大的痛苦,若病人发生了放射性皮肤损伤,应积极给予护理措施,选择合适的敷料,给予皮肤护理、心理护理、体位护理及出院指导等,以促进患者早日康复。

  3. Cochlear Implant

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    In this text, the authors recall the main principles and data ruling cochlear implants. Then, a first circle of technical equipment for assistance is presented. This circle includes: device setting (DS), Electrically evoked Auditory Brainstem Responses (EABR), Neural Response Telemetry (NRT), Stapedial Reflex (SR) and Electrodogram Acquisition (EA). This first cycle becomes more and more important as children are implanted younger and younger; the amount of data available with this assistance makes necessary the use of models (implicit or explicit) to handle this information. Consequently, this field is more open than ever.

  4. Effect of immunomodulation on the fate of tumor cells in the central nervous system and systemic organs of mice. Distribution of (/sup 125/I)5-iodo-2'-deoxyuridine-labeled KHT tumor cells after left intracardial injection

    Energy Technology Data Exchange (ETDEWEB)

    Conley, F.K.

    1982-08-01

    The effect of systemic immunomodulation on tumor cell arrest and retention in the central nervous system was studied by following radioactively labeled tumor cells. KHT mouse sarcoma tumor cells were labeled in vitro with (/sup 125/I)IdUrd, and 1x10/sup 5/ tumor cells were injected into the left side of the hearts of syngeneic C3H mice. Experimental groups consisted of untreated normal mice, mice pretreated iv with Corynebacterium parvum, and mice chronically infected with Toxoplasma gondii; in this model both groups of immunomodulated mice are protected from developing systemic metastatic tumor, but only Toxoplasma-infected mice have protection against metastatic brain tumor. At time intervals from 1 to 96 hours, groups of mice from each experimental group were killed, and the brain and other organs were monitored for radioactivity to determine the number of viable tumor cells that had been present at the time of death. Normal mice demonstrated significant retention of tumor cells in the brain and kidneys plus adrenals at 96 hours. By contrast, in both groups of immunomodulated mice tumor cells were rapidly eliminated from systemic organs, but tumor cells were significantly retained in the central nervous system even at 96 hours after tumor cell injections. The results indicated that generalized immunomodulation had more effect in elimination of tumor cells from systemic organs than from the brain and that the elimination of tumor cells from the brain in Toxoplasma-infected mice was a delayed phenomenon.

  5. Application study of vertebral column metastasis tumor with embedment of 125I by CT guide%CT引导下植入125I放射粒子治疗脊柱溶骨性转移瘤

    Institute of Scientific and Technical Information of China (English)

    王歧峰; 胡效坤; 李子祥

    2014-01-01

    目的 探讨CT引导下植入125I放射粒子治疗脊柱溶骨性转移瘤的方法、疗效、安全性.方法 回顾分析山东省平阴县人民医院放射科和青岛大学附属医院介入医学中心自2004年9月至2012年3月收治的31例脊柱溶骨性转移瘤患者,行CT引导下经皮穿刺植入125I放射粒子治疗.应用放射性粒子近距离治疗计划系统(BI-TPSTM)计划125I放射粒子的活度和用量,处方剂量PD为110 ~ 140 Gy,粒子活度为26.0 ~ 29.6 Mbq/颗,术后行CT扫描并进行质量验证,定期CT随访,分析疗效.31例脊柱溶骨性转移瘤患者,分别于术后2、4、6、12个月复查CT,观察肿瘤变化,统计肿瘤局部控制有效率(RR),评价疼痛缓解情况.结果 19例合并椎旁软组织肿块患者2、4、6、12个月肿瘤RR依次是:19/19、19/19、18/19、17/19例;31例患者治疗后2、4、6、12个月疼痛降低1~3级的缓解率依次是96.8% (30/31)、96.8% (30/31)、90.3% (28/31)、71.0% (22/31);3例(9.68%)在植入部位被破坏的骨质内出现了明显的骨化.12例治疗后1个月出现皮肤色素沉着,未见脊髓坏死和皮肤溃疡.结论 CT引导下植入125I放射粒子治疗脊柱溶骨性转移瘤,疗效可靠、安全性高.%Objective To discuss the method,safety and effect of embedding 125I to Brachytherapy vertebral column metastasis tumor by CT guided.Methods 31 cases of vertebral column metastasis tumor were treated with percutaneous embedding 125I by CT guided.They were observed the preoperative size and contour of lesions and were planed the activity and dosage of 125I,the PD (prescribed dose) was 110-140 Gy,and the particle activity was 26.0-29.6 Mbq.CT scanning and therapeutic effect analysis were immediately carried out after operations.We also made CT scanning regularly to analyze the effect.Results 31 cases of vertebral column metastasis tumor were respectively re-examed of CT in 2,4,6 and 12 months after operation.We surveyed the local rate

  6. Suppression of [sup 125]I-uptake in mouse thyroid by seaweed feeding; Possible preventative effect of dietary seaweed on internal radiation injury of the thyroid by radioactive iodine

    Energy Technology Data Exchange (ETDEWEB)

    Maruyama, Hiroko; Yamamoto, Ichiro (Kitasato Univ., Sagamihara, Kanagawa (Japan). School of Hygienic Sciences)

    1992-12-01

    We conducted an animal experiment to determine how dietary seaweeds rich in iodine and dietary fibers suppress radioactive iodine uptake by the thyroid, using mice and four kinds of experimental diets, three with 1% or 2% powdered fronds of the kelp Laminaria religiosa and 2% powdered laver Porphyra yezoensis, and one with cellulose. Iodine content of a hot-water extract of the kelp was 0.530[+-]0.001%, and its dietary fiber (DF) values were 52.8[+-]1.2%. Iodine in an extract of the laver was 0.008[+-]0.001%, and its DF values were 41.4%[+-]0.7%. A statistically significant reduction of [sup 125]I uptake by the thyroid, 3 hours after intragastric administration of the radionuclide at a dosage of 18.5 kBq or 185 kBq in 0.3 ml aqueous solution per mouse, was observed in mice previously fed the experimental diets containing 1% and 2% kelp during periods varying from 24 hours to 7 days. The degree of the suppression was observed to depend on the amount of iodine in the diet or in the injected sample, no matter whether organic or inorganic, judging from the results of an additional experiment. Thus, we conclude that previously fed iodine-rich material, especially dietary seaweeds rich in iodine and other minerals, vitamins, and [beta]-carotene, such as kelps or laver supplemented with inorganic iodine, may be effective in prevention of internal radiation injury of the thyroid. (author).

  7. An experimental research on monitoring the tumor response to125I seeds with18F-FDG%18F-FDG评价放射性125I治疗肿瘤疗效的实验研究

    Institute of Scientific and Technical Information of China (English)

    柳曦; 彭阳红; 张晓军; 刘健; 周乃康; 张锦明

    2016-01-01

    Objective This study aims to evaluate the efficacy of 18F-FDG PET/CT imaging in assessing the tumor response to iodine-125 brachytherapy, and to investigate the mechanism of 125I seeds effect on tumor. Methods A total of 20 A549 xenografts mice were treated with seeds, one groups(10)were treated with 125Iseeds, other groups(10)were control seeds. The volume of tumors were measured at 1, 2, 4, 8 weeks with calipers. The 18F-FDG Micro PET/CT imaging was performed at the same time. The tumor to muscle(T/NT) ratio was calculated according to the SUV max. All mice were sacrificed at 2 months, and the tumors were evaluated with HE stained. Results There was no obvious difference between the T/NT of treated group and the control group after 1-2 weeks in 18F-FDG images(t = 1.813, P = 0.0721), nor was there any difference found in the measured volume of tumor(t = 1.271, P = 0.111). The T/NT and the volume of tumor in the treated group, however, were significantly different from the control group at and after 4 weeks(P < 0.01). Large number of tumor cells were found toundergo apoptosis after treated with 125I seeds, while the tumor cells in the control group were intact. Both groups had a survival rate of 9/10 after 8 weeks. Conclusion The 125I seeds was found to induce apoptosis to tumor cells. 18F-FDG PET imaging can be used to monitor the tumor response after 125I seeds treated after 4 weeks.%目的:研究18F-FDG对放射性125I粒子治疗恶性肿瘤疗效评价,探索125I粒子对肿瘤细胞杀伤的机理。方法建立A549肿瘤的动物模型(n= 20),分成2组,治疗组(n= 10)肿瘤内植入放射性125I粒子,对照组肿瘤植入空白粒子;分别于1周、2周、4周和8周测量肿瘤的大小,同时注射18F-FDG后Micro PET/CT显像,根据最大标准摄取值(SUVmax)计算肿瘤/肌肉摄取比,2个月后处死小鼠,常规HE染色后观察肿瘤细胞形态。结果荷瘤鼠植入125I粒子后1 ~ 2周,18F-FDG PET

  8. Permanent-Magnet Meissner Bearing

    Science.gov (United States)

    Robertson, Glen A.

    1994-01-01

    Permanent-magnet meissner bearing features inherently stable, self-centering conical configuration. Bearing made stiffer or less stiff by selection of magnets, springs, and spring adjustments. Cylindrical permanent magnets with axial magnetization stacked coaxially on rotor with alternating polarity. Typically, rare-earth magnets used. Magnets machined and fitted together to form conical outer surface.

  9. Permanent deformation of asphalt mixes

    NARCIS (Netherlands)

    Muraya, P.M.

    2007-01-01

    This dissertation describes the results of a research that was conducted on the permanent deformation of asphalt mixtures. Central to this research was the separate characterization of the contribution of the aggregate skeleton and the bituminous mortar towards resistance to permanent deformation. T

  10. The "Permanent" Patient Problem.

    Science.gov (United States)

    Bruce, Courtenay R; Majumder, Mary A

    2014-01-01

    Patients who enter the health care system for acute care may become "permanent" patients of the hospital when a lack of resources precludes discharge to the next level of post-acute care. Legal, professional, and ethical norms prohibit physician and acute care hospital "dumping" of these patients. However, limitless use of hospital resources for indefinite stays is untenable. In the absence of hospital policy addressing this specific issue, the availability of financial support will be determined by health care professionals' willingness to advocate for the patient and negotiate with hospital administrators and the ability and willingness of administrators to authorize the use of hospital resources. We propose five mid-level ethical principles to guide advocacy and administrative decision-making about provision of financial support for post-acute care for those patients who cannot afford it. We use two actual, de-identified cases to illustrate how these principles can be used to make reasoned, consistent decisions about the provision of post-acute financial support.

  11. Surgical Removal of a Giant Vegetation on Permanent Endocavitary Pacemaker Wire and Lead

    Institute of Scientific and Technical Information of China (English)

    Guo-tao Ma; Qi Miao; Chao-ji Zhang; Li-hua Cao

    2011-01-01

    PACEMAKER lead infections are rare.There are only about 0.4%-1.1% of the patients who have been implanted permanent pacemakers suffering from serious infections which lead to endocarditis.1 Generally,removal of the infected pacemaker wire and lead,long-term anti-infection therapy,and implantation of a new pacemaker to another anatomic site are accepted approaches for these patients.

  12. Space maintainer for the loss of a permanent molar in the adolescent patient: report of case.

    Science.gov (United States)

    Lindemeyer, R G; Glavich, G G

    1996-01-01

    An adolescent patient who loses a permanent first molar presents a clinical challenge for the practitioner. The ideal space maintainer should not only maintain the edentulous space, but it should also maintain inter-arch integrity. An esthetic, inexpensive unilateral space maintainer has been designed for the replacement of a permanent first molar in an adolescent patient. The appliance has demonstrated high patient satisfaction, as well as, a good clinical result. This appliance is designed to remain in place until the patient is old enough to receive an implant or a more permanent prosthetic replacement.

  13. Characterization of a series of anabaseine-derived compounds reveals that the 3-(4)-dimethylaminocinnamylidine derivative is a selective agonist at neuronal nicotinic alpha 7/125I-alpha-bungarotoxin receptor subtypes.

    Science.gov (United States)

    de Fiebre, C M; Meyer, E M; Henry, J C; Muraskin, S I; Kem, W R; Papke, R L

    1995-01-01

    Investigation of the naturally occurring, nicotinic agonist anabaseine and novel derivatives has shown that these compounds have cytoprotective and memory-enhancing effects. The hypothesis that these arise at least in part through actions on brain nicotinic receptors was evaluated by examining the ability of these compounds to displace the binding of nicotinic ligands and to affect the function of the alpha 4 beta 2 and alpha 7 receptor subtypes expressed in Xenopus oocytes. The derivative 3-(4)-dimethylaminocinnamylidine anabaseine (DMAC) was found to be a selective alpha 7 receptor agonist; it was more potent than nicotine, acetylcholine, anabaseine, and other derivatives at activating the alpha 7 receptor subtype, while displaying little agonist activity at alpha 4 beta 2 and other receptor subtypes. Compared with anabaseine and the other derivatives, DMAC was the most potent at displacing 125I-alpha-bungarotoxin binding (putative alpha 7) and the least potent at displacing [3H]cytisine binding (putative alpha 4 beta 2) to brain membranes. Independently of agonist activities, all of the novel compounds displayed secondary inhibitory activity at both receptor subtypes. At the alpha 4 beta 2 receptor subtype, inhibition by the 3-(2,4)-dimethoxybenzylidene derivative was enhanced by coapplication of acetylcholine, suggesting a noncompetitive form of inhibition. Anabaseine and nicotine prolonged the time course of activation of alpha 4 beta 2 receptors, compared with acetylcholine, suggesting sequential channel-blocking activity. As selective agonists, anabaseine derivatives such as DMAC may be useful for elucidating the function of alpha 7 nicotinic receptors, including their potential role(s) in the cytoprotective and memory-enhancing effects of nicotinic agents.

  14. Molecular pharmacology of the calcium channel: evidence for subtypes, multiple drug-receptor sites, channel subunits, and the development of a radioiodinated 1,4-dihydropyridine calcium channel label, (/sup 125/I)iodipine

    Energy Technology Data Exchange (ETDEWEB)

    Glossmann, H.; Ferry, D.R.; Goll, A.; Rombusch, M.

    1984-01-01

    Radiolabeled Ca2+ antagonists (1,4-dihydropyridines, verapamil, and D-cis-diltiazem) were used to study voltage-operated Ca2+ channels in different excitable tissues. The concept of three subtypes of Ca2+ channels, represented by brain, heart, and skeletal-muscle isoreceptors for 1,4-dihydropyridines, is developed. The three subtypes are characterized by a variety of criteria. Despite the biochemical differences between the subtypes, they have the same Mr in situ by target-size analysis (Mr approximately equal to 180,000, when evaluated by (/sub 3/H)nimodipine). The concept of the metalloprotein nature of the channel and the interaction of channel drugs with the Me2+ binding sites of the ionic pore is demonstrated. Distinct but interacting drug-receptor sites of the Ca2+ channel are found by direct labeling as well as indirectly by drug competition studies. The authors distinguish between the 1,4-dihydropyridine site, the verapamil site, and the D-cis-diltiazem site. Each receptor site can exist in high and low-affinity state; the distribution of receptor sites in these states is regulated by temperature, ions, and drugs. The concept of intrinsic activity of drugs to stabilize the high-affinity state is exemplified for the 1,4-dihydropyridines. A change in the channel architecture is induced by binding of D-cis-diltiazem to its drug receptor site. This is proven by target-size analysis of the channel in situ. Partially purified t-tubule membranes from skeletal muscle are an extremely rich source of Ca2+ channel drug-receptor sites. The stoichiometry was determined in this preparation and found to be four verapamil:two 1,4-dihydropyridine:one D-cis-diltiazem site. A novel Ca2+ channel probe, (/sup 125/I)iodipine (2,200 Ci/mmol), was synthetized, and the properties of this ligand are presented.

  15. Biological safety evaluation of 125I-filled carbon nanotubes covered with metallic esophageal stent%125I碳纳米管覆膜金属支架生物安全性的实验研究

    Institute of Scientific and Technical Information of China (English)

    董生; 袁正; 李文新; 吴胜伟

    2011-01-01

    Objective To evaluate the biological safety of 125I-filled carbon nanotubes covered with metallic esophageal stent with regard to the normal esophagus before clinical application.Methods 125I-filled carbon nanotubes covered with metallic esophageal stent was prepared.Eighteen of New Zealand rabbits were randomly divided into three groups with 6 rabbits in each group.Three groups of stents,non-radioactive,low radio-activity ( 3.7 - 5.6 MBq),and high activity ( 11.1 - 13.0 MBq ) were placed in the midpiece of esophagus of rabbits.Esophagus opacification and three-diamensions DSA were performed at 0.5 h,7,14 and 30 d after insertion of the stents,respectively.The rabbits were killed at 30d after insertion of the stents,and histologic examinations of the esophageal walls were performed.Results In non-radioactive and low activity groups,1 of 6 rabbits died of wound infection at 1 and 3 d after surgery due to pulmonary infection,respectively.All specimens were obtained from 16 rabbits.Microscopically,in all rabbits of low activity and high activity groups,there were membrana mucosa necrotic and swell and breakage of the muscle fiber in esophageal submucosa and muscularis,submucosal inflammation,which were more severe in high activity group.In low activity group,one esophagus ectal membrane was involved,however,esophageal perforation did not develop.In high activity group,3 of 6rabbits esophageal perforation had developed,in which one esophagus mediastinum fistula developed,without inflammation.In non-radioactive group,it was almost normal in mucosa layer,a small amount of inflammatory cells were found in submucosal layer,and part of muscle fibers was fractured and no pathological changes of necrosis was found.Conclusions Radioactive 125I carbon nanotubes covered metallic stent with low activity(3.7 -5.6 MBq) can be used as intraluminal palliative brachytherapy,which is safe and effective.%目的 探讨125I碳纳米管覆膜金属支架对兔正常

  16. Epidural fibrosis after permanent catheter insertion and infusion.

    Science.gov (United States)

    Aldrete, J A

    1995-11-01

    Forty-six permanent epidural catheters and life-port units were implanted in 43 patients with severe, recurrent low back pain who had been considered not to be candidates for surgical intervention and in whom other therapeutic modalities had failed. Eight cases developed epidural fibrosis (EF). For analgesia, patients received either infusions with preservative-free solutions of fentanyl and bupivacaine or daily boluses of morphine and bupivacaine. Catheters remained from 75 days to 433 days. Signs of EF appeared from 21 days to 320 days after implantation. Pain at injection or resistance to injection were initial manifestations of EF, followed by poor, and eventually, nil analgesic effect. The epidural catheters were made of either polyamide, silicone, or polyurethane. Epidurograms revealed encapsulation, narrowing, and loculation of epidural space with gradually reduced spread of the contrast material. The occurrence of EF limits the permanency of implanted epidural catheters. The infusate does not cause this complication, which appears to be a foreign body reaction due to the presence of the catheter in the epidural space.

  17. Short Implants: New Horizon in Implant Dentistry.

    Science.gov (United States)

    Jain, Neha; Gulati, Manisha; Garg, Meenu; Pathak, Chetan

    2016-09-01

    The choice of implant length is an essential factor in deciding the survival rates of these implants and the overall success of the prosthesis. Placing an implant in the posterior part of the maxilla and mandible has always been very critical due to poor bone quality and quantity. Long implants can be placed in association with complex surgical procedures such as sinus lift and bone augmentation. These techniques are associated with higher cost, increased treatment time and greater morbidity. Hence, there is need for a less invasive treatment option in areas of poor bone quantity and quality. Data related to survival rates of short implants, their design and prosthetic considerations has been compiled and structured in this manuscript with emphasis on the indications, advantages of short implants and critical biomechanical factors to be taken into consideration when choosing to place them. Studies have shown that comparable success rates can be achieved with short implants as those with long implants by decreasing the lateral forces to the prosthesis, eliminating cantilevers, increasing implant surface area and improving implant to abutment connection. Short implants can be considered as an effective treatment alternative in resorbed ridges. Short implants can be considered as a viable treatment option in atrophic ridge cases in order to avoid complex surgical procedures required to place long implants. With improvement in the implant surface geometry and surface texture, there is an increase in the bone implant contact area which provides a good primary stability during osseo-integration.

  18. Nursing care guide to the establishment of a subcutaneous permanent reservoir

    Directory of Open Access Journals (Sweden)

    Encarnación Molina Navarrete

    2009-03-01

    Full Text Available The subcutaneous permanent reservoir are catheters that are going to be implanted for a long time, and which theoretically present less incidences of trombotic complications and lesions of the vascular wall. Our hospital is the only regional of the zone, without Unit of Vascular Surgery, where there are carried out the establishment of this kind of devices.

  19. Radiation physics, quality control, and quality assurance of lung cancer brachytherapy with 125I particles%肺癌125I粒子近距离治疗放射剂量学质量控制与保证的策略研究

    Institute of Scientific and Technical Information of China (English)

    李小东; 张遵城; 郑广钧; 郭永涛; 常津; 王平

    2014-01-01

    Objective:To improve the therapeutic gain ratio from 125I seed implants by investigating the QA/QC strategies used in brachytherapy treatment of lung cancer. Methods:A total of 287 lung cancer and pulmonary metastases cases were studied. Among which, 184 are male and 103 are female with a mean age of 61.9 years. The NOA-NSCLC subgroup and pulmonary metastases were targeted on conventional CT positioning. Considering that COA-NSCL subgroup on the tumor target area is difficult to determine with CT, the coincidence circuit SPECT was used to assist in positioning. A dose-volume histogram was constructed to evaluate the quality of the TPS and optimization. Corrections on real-time positioning are necessary when using an image-guided implantation. The C-LC should be aligned with the FFB for CT-guided percutaneous puncture implantation. After implantation, dosimetry verification was con-ducted. Results:The NOA-NSCLC subgroup, comprising the risk organs such as heart, lung, and spinal column, received an average dose of 137, which was significantly lower than that of normal tissue dose tolerance. The NOA-NSCLC subgroup and lung metastases have matched peripheral dosages of 92.1 and 106.2 Gy with local-control efficiency rates of 91.97% (126/137) and 96.0% (48/50), 1-year survival rates of 91.24%and 83.4%(42/50), and 2-year survival rates of 50.36%(69/137) and 52.3%(26/50), respectively. The 35 COA-NSCL subgroup and 65 lung cancer group have local control efficiency rates of 91.43%(32/35) and 92.3%(60/65) and 1-year survival rates of 88.57%(31/35) and 80.30%(53/66), respectively. Conclusion:Proper radiation dosimetry as a QA/QC strategy was found to improve particle-implantation therapy gain and greatly reduce the risks of radiation pneumonia and pulmonary fibrosis.%目的:探讨能提高125I粒子植入治疗肺癌增益比的放射物理质量控制和保证(QA/QC)的策略。方法:确诊的肺癌和肺转移瘤患者287例,男184例,女103

  20. Cochlear Implant

    Directory of Open Access Journals (Sweden)

    Mehrnaz Karimi

    1992-04-01

    Full Text Available People with profound hearing loss are not able to use some kinds of conventional amplifiers due to the nature of their loss . In these people, hearing sense is stimulated only when the auditory nerve is activated via electrical stimulation. This stimulation is possible through cochlear implant. In fact, for the deaf people who have good mental health and can not use surgical and medical treatment and also can not benefit from air and bone conduction hearing aids, this device is used if they have normal central auditory system. The basic parts of the device included: Microphone, speech processor, transmitter, stimulator and receiver, and electrode array.

  1. Hernia Surgical Mesh Implants

    Science.gov (United States)

    ... Prosthetics Hernia Surgical Mesh Implants Hernia Surgical Mesh Implants Share Tweet Linkedin Pin it More sharing options ... majority of tissue used to produce these mesh implants are from a pig (porcine) or cow (bovine) ...

  2. Urogynecologic Surgical Mesh Implants

    Science.gov (United States)

    ... Prosthetics Urogynecologic Surgical Mesh Implants Urogynecologic Surgical Mesh Implants Share Tweet Linkedin Pin it More sharing options ... majority of tissue used to produce these mesh implants are from a pig (porcine) or cow (bovine). ...

  3. 6711型125I种子源剂量学参量的蒙特卡罗模拟研究%Monte Carlo determination of dosimetry parameters for model 6711 125I seed

    Institute of Scientific and Technical Information of China (English)

    孙吉宁; 樊铁栓; 杨元第; 温松明; 胡家成; 苏以翔; 杨鸿栋; 温琛琳

    2008-01-01

    Objective To calculate the brachytherapy dosimetry parameters for Model 6711 125I seeds.Methods Brachytherapy dosimetry parameters are determined in accordance with the AAPM Task Group No.43 TG43-U1 dosimetry protocol.The anisotropy funetion,radial dose function,dose rate constant and dose distributions in different medium are calculated using EGSnrc code with the updated XCOM cross section libraries.Results The anisotropy function and the radial dose function are in good agreement with the data reported lately.The calculated dose rate constant is 0.951 cGy·h-1·U-1,in a 1.45% agreement with the consensus data recommended by AAPM TG43-U1 report.Conclusions The dose field around the seed source shows the characteristics of very low dose rate and very high dose gradient.A small structure iS found in the small polar angle range and the small distances of the anisotropy function.%目的 计算6711型125I种子源的剂量特性.方法 使用EGSnrc蒙特卡罗模拟程序对种子源的各向异性函数、径向剂量函数和剂量率常数进行计算,并给出了不同介质中的空间剂量率分布,将计算结果与美国医学物理师协会(AAPM)TG43-U1号报告中的推荐值和其他已发表的相关数据进行了比较.结果 各向异性函数与其他最新发表的数据符合较好;径向剂量函数与TG43-U1推荐值符合较好;剂量率常数为0.951 cGy·h-1·U-1,与TG43-U1推荐值在1.45%内吻合.结论 6711型125I种子源剂量场具有低剂量率,高梯度的特点;各向异性函数在近距离小角度处存在小突起的结构.

  4. Animal experiment study of silica nanoparticles labeled peptides with 125 I%包裹125 I标记多肽的二氧化硅纳米颗粒的动物实验研究

    Institute of Scientific and Technical Information of China (English)

    王风秀; 王加芬; 陆小伟

    2014-01-01

    目的:探讨纳米二氧化硅是否可作为生物大分子药物口服载体。方法研究钙离子的量对二氧化硅纳米颗粒形态的影响、不同钙离子存在下二氧化硅纳米颗粒对蛋白或多肽的包裹率、蛋白或多肽从二氧化硅纳米颗粒中释放情况、二氧化硅包裹蛋白酶解情况、以及二氧化硅纳米颗粒包裹125 I标记多肽在小鼠体内释放情况。结果实验表明合成的二氧化硅纳米颗粒包裹多肽在小白鼠体内可以顺利通过胃酸到达小肠,有作为生物活性大分子口服药物载体的潜力。结论蛋白或多肽比较容易在碱性条件下释放,在pH 2的酸性条件下释放极少(胃酸的pH值),制备的二氧化硅纳米颗粒有作为口服药物载体的潜力。%Objective To study whether the silica nanoparticles can be used as a biomacromolecular carrier of oral drugs.Methods Studyed the influence of the amount of calcium ions on nano silica nanoparticles morphology,the encapsulation rate of silica nanoparticles on proteins or peptides in the presence of different calcium ions,the situation of proteins or peptides released from silica nanoparticles,enzymolysis of protein packaged by silica, silica nanoparticles labeled peptides with 125 I released in mice.Results Experiments showed that the synthetic silica nanoparticles packaged with peptides could smoothly reach the small intestine through the gastric acid in mice, it had potential to be biomacromolecular carrier of oral drug. Conclusion Proteins or peptides is easy to release in alkaline condition,but release few in acidic condition of pH2 (PH of gastric acid).The silica nanoparticles prepared have the potential to be oral drug carrier.

  5. Qualitative permanence of Lotka-Volterra equations.

    Science.gov (United States)

    Hofbauer, Josef; Kon, Ryusuke; Saito, Yasuhisa

    2008-12-01

    In this paper, we consider permanence of Lotka-Volterra equations. We investigate the sign structure of the interaction matrix that guarantees the permanence of a Lotka-Volterra equation whenever it has a positive equilibrium point. An interaction matrix with this property is said to be qualitatively permanent. Our results provide both necessary and sufficient conditions for qualitative permanence.

  6. Lodestone: Nature's own permanent magnet

    Science.gov (United States)

    Wasilewski, P.

    1976-01-01

    Magnetic hysteresis and microstructural details are presented which explain why the class of magnetic iron ores defined as proto-lodestones, can behave as permanent magnets, i.e. lodestones. Certain of these proto-lodestones which are not permanent magnets can be made into permanent magnets by charging in a field greater than 1000 oersted. This fact, other experimental observations, and field evidence from antiquity and the middle ages, which seems to indicate that lodestones are found as localized patches within massive ore bodies, suggests that lightning might be responsible for the charging of lodestones. The large remanent magnetization, high values of coercive force, and good time stability for the remanent magnetization are all characteristics of proto-lodestone iron ores which behave magnetically as fine scale ( 10 micrometer) intergrowths when subjected to magnetic hysteresis analysis. The magnetic results are easily understood by analysis of the complex proto lodestone microstructural patterns observable at the micrometer scale and less.

  7. Topology optimized permanent magnet systems

    CERN Document Server

    Bjørk, R; Insinga, A R

    2016-01-01

    Topology optimization of permanent magnet systems consisting of permanent magnets, high permeability iron and air is presented. An implementation of topology optimization for magnetostatics is discussed and three examples are considered. First, the Halbach cylinder is topology optimized with iron and an increase of 15% in magnetic efficiency is shown, albeit with an increase of 3.8 pp. in field inhomogeneity - a value compared to the inhomogeneity in a 16 segmented Halbach cylinder. Following this a topology optimized structure to concentrate a homogeneous field is shown to increase the magnitude of the field by 111% for the chosen dimensions. Finally, a permanent magnet with alternating high and low field regions is considered. Here a $\\Lambda_\\mathrm{cool}$ figure of merit of 0.472 is reached, which is an increase of 100% compared to a previous optimized design.

  8. Transient or permanent fisheye views

    DEFF Research Database (Denmark)

    Jakobsen, Mikkel Rønne; Hornbæk, Kasper

    2012-01-01

    , about the benefits and limitations of transient visualizations. We describe an experiment that compares the usability of a fisheye view that participants could call up temporarily, a permanent fisheye view, and a linear view: all interfaces gave access to source code in the editor of a widespread......Transient use of information visualization may support specific tasks without permanently changing the user interface. Transient visualizations provide immediate and transient use of information visualization close to and in the context of the user’s focus of attention. Little is known, however...... programming environment. Fourteen participants performed varied tasks involving navigation and understanding of source code. Participants used the three interfaces for between four and six hours in all. Time and accuracy measures were inconclusive, but subjective data showed a preference for the permanent...

  9. Electromagnetic acceleration of permanent magnets

    CERN Document Server

    Dolya, S N

    2015-01-01

    We consider the acceleration of the permanent magnets, consisting of neodymium iron boron by means of the running magnetic field gradient. It is shown that the specific magnetic moment per nucleon in neodymium iron boron is determined by the remained magnetization of the substance. The maximum accessable gradient of the magnetic field accelerating the permanent magnets is determined by the coercive force thirty kilogauss. For the neodymium iron boron magnets this gradient is equal to twenty kilogauss divided by one centimeter. The finite velocity of the magnets six kilometers per second, the length of acceleration is six hundred thirty-seven meters.

  10. Early eruption of permanent canines

    Directory of Open Access Journals (Sweden)

    S Madhu

    2012-01-01

    Full Text Available Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  11. The impact of prostate edema on cell survival and tumor control after permanent interstitial brachytherapy for early stage prostate cancers

    Science.gov (United States)

    (Jay Chen, Zhe; Roberts, Kenneth; Decker, Roy; Pathare, Pradip; Rockwell, Sara; Nath, Ravinder

    2011-08-01

    Previous studies have shown that procedure-induced prostate edema during permanent interstitial brachytherapy (PIB) can cause significant variations in the dose delivered to the prostate gland. Because the clinical impact of edema-induced dose variations strongly depends on the magnitude of the edema, the temporal pattern of its resolution and its interplay with the decay of radioactivity and the underlying biological processes of tumor cells (such as tumor potential doubling time), we investigated the impact of edema-induced dose variations on the tumor cell survival and tumor control probability after PIB with the 131Cs, 125I and 103Pd sources used in current clinical practice. The exponential edema resolution model reported by Waterman et al (1998 Int. J. Radiat. Oncol. Biol. Phys. 41 1069-77) was used to characterize the edema evolutions previously observed during clinical PIB for prostate cancer. The concept of biologically effective dose, taking into account tumor cell proliferation and sublethal damage repair during dose delivery, was used to characterize the effects of prostate edema on cell survival and tumor control probability. Our calculation indicated that prostate edema, if not appropriately taken into account, can increase the cell survival and decrease the probability of local control of PIB. The magnitude of an edema-induced increase in cell survival increased with increasing edema severity, decreasing half-life of radioactive decay and decreasing photon energy emitted by the source. At the doses currently prescribed for PIB and for prostate cancer cells characterized by nominal radiobiology parameters recommended by AAPM TG-137, PIB using 125I sources was less affected by edema than PIB using 131Cs or 103Pd sources due to the long radioactive decay half-life of 125I. The effect of edema on PIB using 131Cs or 103Pd was similar. The effect of edema on 103Pd PIB was slightly greater, even though the decay half-life of 103Pd (17 days) is longer than

  12. Pacemaker implantation complication rates in elderly and young patients

    Directory of Open Access Journals (Sweden)

    Özcan KS

    2013-08-01

    Full Text Available Kazim Serhan Özcan, Damirbek Osmonov, Servet Altay, Cevdet Dönmez, Ersin Yildirim, Ceyhan Türkkan, Baris Güngör, Ahmet Ekmekçi, Ahmet Taha Alper, Kadir Gürkan, İzzet ErdinlerDepartment of Cardiology, Siyami Ersek Cardiovascular and Thoracic Surgery Center, Istanbul, TurkeyAims: To evaluate the complication rate differences between elderly and younger patients who receive a permanent pacemaker implantation.Methods: We reviewed all cases admitted to our institution between January 2008 and June 2009 with symptomatic bradyarrhythmia for whom a permanent pacemaker was implanted. Beginning in June 2009, we prospectively collected data from all patients with the same diagnosis and procedure. The frequency of complications due to the pacemaker implantation procedure was evaluated and compared between young (<70 years old and elderly (≥70 years old patients.Results: Among 574 patients with a permanent pacemaker, 259 patients (45.1% were below and 315 patients (54.9% were above or at 70 years of age. There were 240 (92.7% and 19 (7.3% dual-chamber pacemaker (DDD and single-chamber pacemaker (VVI implanted patients in the younger group, and 291 (76.8% and 73 (23.2% DDD and VVI pacemaker implanted patients in the elderly group, respectively. The complication rate was 39 (15.1% out of 259 young patients and 24 (7.6% out of 315 elderly patients. Postprocedural complications were statistically lower in the elderly patients than in younger patients (P = 0.005.Conclusion: A pacemaker implantation performed by an experienced operator is a safe procedure for patients of advanced age. The patients who are above 70 years old may have less complication rates than the younger patients.Keywords: complications of pacemaker implantation, elderly patients, permanent pacemaker

  13. Overview on permanent magnetic actuator

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Permanent magnetic actuator (PMA), as a new electronic actuator of vacuum circuit breakers, certainly will be used to replace the traditional mechanical actuator. It has such advantages as simple structure, high reliability, free maintenance, and so on. This paper summarizes the development, structure, magnetic analysis, character analysis, and control strategy of PMA, and also predicts the future trend of PMA development

  14. Magnetic Fields: Visible and Permanent.

    Science.gov (United States)

    Winkeljohn, Dorothy R.; Earl, Robert D.

    1983-01-01

    Children will be able to see the concept of a magnetic field translated into a visible reality using the simple method outlined. Standard shelf paper, magnets, iron filings, and paint in a spray can are used to prepare a permanent and well-detailed picture of the magnetic field. (Author/JN)

  15. The cycloid Permanent Magnetic Gear

    DEFF Research Database (Denmark)

    Rasmussen, Peter Omand; Andersen, Torben Ole; Jørgensen, Frank T.

    2008-01-01

    This paper presents a new permanent-magnet gear based on the cycloid gearing principle. which normally is characterized by an extreme torque density and a very high gearing ratio. An initial design of the proposed magnetic gear was designed, analyzed, and optimized with an analytical model regard...

  16. Study of the Dose Distribution of 192Ir、 125I Seed in Different Tissue in Brachytherapy%不同人体组织中192Ir、125I粒子源的剂量分布研究

    Institute of Scientific and Technical Information of China (English)

    汤晓斌; 陈飞达; 谢芹; 刘云鹏; 耿长冉; 陈达

    2011-01-01

    目的:计算分析近距离放疗中不同粒子源、不同插植部位的剂量分布.方法:利用蒙特卡罗粒子输运工具包Geant4,计算近距离放疗中192Ir、125I两种粒子源在不同介质中剂量分布的差异,并根据美国医学物理学会43号工作组报告推荐的近距离放疗剂量计算公式(AAPM TG-43)对其重要参数进行修正.结果:计算得到192Ir源、125I源在三种不同组织等效材料中的径向剂量函数、各项异性函数.结论:(1)径向剂量函数决定于介质对光子的线能量衰减系数.衰减系数越大,径向剂量函数下降越快,反之越平缓;125I粒子源的径向剂量函数随距源距离增大而衰减的趋势远大于192Ir粒子源.(2)随着距源距离增大,骨、水等效组织中各向异性函数曲线趋于平坦,肺等效组织则没有变化.%Objective: The dose distribution is one of the most essential questions in brachytherapy. The dose varies largely between different seed and different phantom materials so accurate simulation is needed. Methods: In this paper, a Monte Carlo simulation program toolkits-Geant4 has been used to calculate the dose distribution in different phantom materials around two kinds of brachytherapy source: 192Ir and 125I, respectively. Results: The radial dose function and anisotropy function has been calculated and analyzed detailedly based on the formula recommended by the American Association of Physics in Medicine Report of the Working Group 43(AAPM TG-43). Conclusions: (1) The radial dose function depends on p, en of photon in materials and the radial dose function of I25I fall down much more sharply than 192Ir. (2) The curves of the anisotropy function in water and bone phantom materials become more plain than in lung phantom while the radial distance increases. This phenomenon reflects a law that more attenuation and scatter in materials, the curve of anisotropy function is more plain.

  17. [Bilateral cochlear implantation].

    Science.gov (United States)

    Kronenberg, Jona; Migirov, Lela; Taitelbaum-Swead, Rikey; Hildesheimer, Minka

    2010-06-01

    Cochlear implant surgery became the standard of care in hearing rehabilitation of patients with severe to profound sensorineural hearing loss. This procedure may alter the lives of children and adults enabling them to integrate with the hearing population. In the past, implantation was performed only in one ear, despite the fact that binaural hearing is superior to unilateral, especially in noisy conditions. Cochlear implantation may be performed sequentially or simultaneously. The "sensitive period" of time between hearing loss and implantation and between the two implantations, when performed sequentially, significantly influences the results. Shorter time spans between implantations improve the hearing results after implantation. Hearing success after implantation is highly dependent on the rehabilitation process which includes mapping, implant adjustments and hearing training. Bilateral cochlear implantation in children is recommended as the proposed procedure in spite of the additional financial burden.

  18. Implant survivorship analysis after minimally invasive sacroiliac joint fusion using the iFuse Implant System®

    Directory of Open Access Journals (Sweden)

    Cher DJ

    2015-11-01

    Full Text Available Daniel J Cher,1 W Carlton Reckling,2 Robyn A Capobianco1 1Department of Clinical Affairs, SI-BONE, Inc., 2Department of Medical Affairs, SI-BONE, Inc., San Jose, CA, USA Introduction: Surgical revision rate is a key outcome with all permanent implants. The iFuse Implant System® is a permanent implant used to perform minimally invasive sacroiliac joint fusion. The purpose of this study is to determine the surgical revision rate after sacroiliac joint fusion surgery with this system. Methods: Using two internal sources of information, revision surgeries were identified and linked to index surgeries. The likelihood of revision surgery was calculated using the Kaplan–Meier life table approach. Predictors of revision were explored. Results: Four-year survivorship free from implant revision was 96.46%. Revision rate did not differ by sex and was lower for age >65. In all, 24% of revisions occurred within the first 30 days after surgery; 63.5% occurred within year 1. Implant survivorship has improved annually since the device was introduced in 2009. Conclusion: The survivorship rate with this implant is high and improving; the rate is somewhat higher than total hip replacement but lower than that of lumbar spine procedures. Keywords: safety, sacroiliac joint fusion, iFuse Implant System, revision

  19. PERMANENT-MAGNET INDUCTION GENERATORS: AN OVERVIEW

    Directory of Open Access Journals (Sweden)

    K. S. S. RAMAKRISHNAN

    2011-06-01

    Full Text Available The advantage of using a permanent-magnet induction generator (PMIG instead of a conventional induction generator is its ability to suppress inrush current during system linking when synchronous input is performed. Induction machines excited with permanent-magnet (PM are called permanent-magnet induction generators. This paper presents an exhaustive survey of the literature discussing the classification of permanent-magnet machines, process of permanent-magnet excitation and voltage build-up, modelling, steady-state and performance analysis of the permanent-magnet induction generators.

  20. 磁感应热疗联合125I籽源近距离放疗研究%Feasibility of the Magnetic Induction Hyperthermia Combined with 125I Brachytherapy

    Institute of Scientific and Technical Information of China (English)

    蔡东阳; 李立; 孔维超; 赵凌云; 唐劲天

    2013-01-01

    Both alloy thermo-seed and radiation seed implanted by magnetic induction hyperthermia are at the same level with the scale. When the thermo-seed and radiation seed implant into the tumor tissue at the same time, thermal field and radiation will act together on the tumor cells, enhancing the destruction effect of tumor cell. The electromagnetic theory is applied to calculate the heat production power by thermo-seed and radiation seed in the RF magnetic Geld; and the thermo-seed and radiation seed are placed with different distributions into the RF magnetic field of the magnetic induction equipment in order to examine the temperature rise curve under various conditions by adjusting the magnetic field parameters. The heating effect of radiation seed in the RF magnetic field are studied in order to verify the safety of the radiation seed; with alloy thermo-seed and radiation seed are in a mixed configuration, the heating effect is studied in order to verify the effectiveness of the combined therapy. The theoretical calculations indicate lhat the magneto-caloric effect of radiation seed source in the RF magnetic'field of magnetic induction therapy (50~500kHz) is insignificant, and the safety of hyperthermia and radiotherapy has been verified. When radiation seed mixing with thermo-seed are implanted into the agar model and the muscle tissue in vitro, the temperature in the media implanted area is far above 43℃, realizing the sensibilization that hyperthermia has on radiotherapy in the implanted-area.%磁感应热疗植入合金热籽与放射籽源在尺度上处于同一水平,当热籽和放射籽源同时植入肿瘤组织,热场和辐射将共同作用于肿瘤细胞,提高肿瘤细胞的杀灭作用.本文应用电磁学理论计算射频磁场中热籽和放射籽源的产热功率.并将不同分布的热籽和放射籽源置于磁感应设备射频磁场中,调节磁场参数,观察不同条件下的温升曲线.同时研究了放射籽源在磁感

  1. Manganese-based Permanent Magnets

    Directory of Open Access Journals (Sweden)

    Ian Baker

    2015-08-01

    Full Text Available There is a significant gap between the energy product, BH, where B is the magnetic flux density and H is the magnetic field strength, of both the traditional ferrite and AlNiCo permanent magnets of less than 10 MGOe and that of the rare earth magnets of greater than 30 MGOe. This is a gap that Mn-based magnets could potentially, inexpensively, fill. This Special Issue presents work on the development of both types of manganese permanent magnets. Some of the challenges involved in the development of these magnets include improving the compounds’ energy product, increasing the thermal stability of these metastable compounds, and producing them in quantity as a bulk material.[...

  2. Trans-permanent magnetic actuation

    Science.gov (United States)

    Farmer, Daniel Jay

    The demands for an actuator to deploy, position and shape large spaced-based structures form a unique set of design criteria. In many applications it is desirable to hold displacements or forces between two points to within specified requirements (the regulation problem) and to periodically to change position (the tracking problem). Furthermore, the interest generally lies in satisfying the dynamic performance requirements while expending minimal power, while meeting tight tolerances and while experiencing little wear and fatigue. The actuator must also be able to withstand a variety of operational conditions such as impacts and thermal changes over an extended period of time. Current trends in large-scale structures have addressed the demands by using conventional actuators and motors, along with elaborate linkages or mechanisms to shape, position, protect and deploy. The developed designs use unique characteristics of permanent magnets to create simple direct-acting actuators and motors very suitable for space based structures. The developed trans-permanent magnetic (T-PM) actuators and motors are systems consisting of one or more permanent magnets, some of whose magnetic strengths can be switched on-board by surrounding pulse-coils. The T-PM actuator and motors expend no power during regulation. The T-PM can periodically change or remove the strength of its own magnets thereby enabling both fine-tune adjustments (microsteps) and large-scale adjustments (rotation). The fine (microstep) adjustments are particularly helpful in thermally varying space environments. The large-scale adjustments (rotation) are particularly helpful in deployment where the structure or antenna must experience large-angle rotations and/or large displacements. T-PM concepts are illustrated in direct acting actuators and built into stepper motor and permanent magnet motor applications. Several examples of design, analysis and testing are developed to verify the technology and supporting

  3. Permanent magnets including undulators and wigglers

    OpenAIRE

    Bahrdt, J.

    2011-01-01

    After a few historic remarks on magnetic materials we introduce the basic definitions related to permanent magnets. The magnetic properties of the most common materials are reviewed and the production processes are described. Measurement techniques for the characterization of macroscopic and microscopic properties of permanent magnets are presented. Field simulation techniques for permanent magnet devices are discussed. Today, permanent magnets are used in many fields. This article concentrat...

  4. 21 CFR 886.4445 - Permanent magnet.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Permanent magnet. 886.4445 Section 886.4445 Food... DEVICES OPHTHALMIC DEVICES Surgical Devices § 886.4445 Permanent magnet. (a) Identification. A permanent magnet is a nonelectric device that generates a magnetic field intended to find and remove...

  5. Implant success!!!.....simplified

    Directory of Open Access Journals (Sweden)

    Luthra Kaushal

    2009-01-01

    Full Text Available The endeavor towards life-like restoration has helped nurture new vistas in the art and science of implant dentistry. The protocol of "restoration-driven implant placement" ensures that the implant is an apical extension of the ideal future restoration and not the opposite. Meticulous pre-implant evaluation of soft and hard tissues, diagnostic cast and use of aesthetic wax-up and radiographic template combined with surgical template can simplify the intricate roadmap for appropriate implant treatment. By applying the harmony of artistic skill, scientific knowledge and clinical expertise, we can simply master the outstanding implant success in requisites of aesthetics, phonetics and function.

  6. Technique of after-loading interstitial implants.

    Science.gov (United States)

    Syed, A M; Feder, B H

    1977-01-01

    Interstitial implants are either removable or permanent (and occasionally a combination of both). Permanent implants are generally utilized where tumors are not accessible enough to permit easy removal of sources or where accurate source distribution is less critical. They are useful for cancers of the lung, pancreas, prostate, bladder, lymph nodes, etc. Radon and gold-198 have been largely replaced by iodine-125. Our major interests are in the removable after-loading iridium-192 implant techniques. Template (steel guide) and non-template (plastic tube) techniques are utilized. Templates are preferred where the tumor volume can only be approached from one side and where accurate positioning of sources would otherwise be difficult. They are useful for cancers of the cervix, vagina, urethra, and rectum. Non-template (plastic tube) techniques are preferred where the tumor volume can be approached from at least two sides and where templates are either not feasible or not essential for accurate positioning of sources. The single needle non-template approach is useful for cancers of lip, nodes, and breast (plastic button) and for cancers of the oral cavity and oropharynx (gold button). The paired needle non-template approach is useful for cancers of the gum, retromolar trigone, and base of tongue (loop technique) and for cancers of the palate (arch technique). Procedures for each technique are described in detail.

  7. Permanent-File-Validation Utility Computer Program

    Science.gov (United States)

    Derry, Stephen D.

    1988-01-01

    Errors in files detected and corrected during operation. Permanent File Validation (PFVAL) utility computer program provides CDC CYBER NOS sites with mechanism to verify integrity of permanent file base. Locates and identifies permanent file errors in Mass Storage Table (MST) and Track Reservation Table (TRT), in permanent file catalog entries (PFC's) in permit sectors, and in disk sector linkage. All detected errors written to listing file and system and job day files. Program operates by reading system tables , catalog track, permit sectors, and disk linkage bytes to vaidate expected and actual file linkages. Used extensively to identify and locate errors in permanent files and enable online correction, reducing computer-system downtime.

  8. Breast Implants: Saline vs. Silicone

    Science.gov (United States)

    ... differ in material and consistency, however. Saline breast implants Saline implants are filled with sterile salt water. ... of any age for breast reconstruction. Silicone breast implants Silicone implants are pre-filled with silicone gel — ...

  9. Implantable Medical Devices

    Science.gov (United States)

    ... Artery Disease Venous Thromboembolism Aortic Aneurysm More Implantable Medical Devices Updated:Sep 16,2016 For Rhythm Control ... a Heart Attack Introduction Medications Surgical Procedures Implantable Medical Devices • Life After a Heart Attack • Heart Attack ...

  10. Urinary incontinence - collagen implants

    Science.gov (United States)

    ... gov/ency/article/007373.htm Urinary incontinence - injectable implant To use the sharing features on this page, please enable JavaScript. Injectable implants are injections of material into the urethra to ...

  11. CERN Permanent exhibitions short version

    CERN Multimedia

    2016-01-01

    Visits Explore by yourself the issues CERN's physicists are trying to solve: given that the entire universe is made of particles, where do they come from? Why do they behave in the way they do? Discover the massive apparatus used by physicists at CERN, like the LHC, and see how each part works. CERN invites the public to discover the mysteries of the Universe and the work of the world's biggest physics laboratory through free of charge guided tours and permanent exhibitions. As a group, with friends, individually, on foot, on your bike, come and discover CERN or explore it virtually. Welcome!

  12. Preferred tools and techniques for implantation of cardiac electronic devices in Europe: results of the European Heart Rhythm Association survey.

    Science.gov (United States)

    Bongiorni, Maria Grazia; Proclemer, Alessandro; Dobreanu, Dan; Marinskis, Germanas; Pison, Laurent; Blomstrom-Lundqvist, Carina

    2013-11-01

    The aim of this European Heart Rhythm Association (EHRA) survey was to assess clinical practice in relation to the tools and techniques used for cardiac implantable electronic devices procedures in the European countries. Responses to the questionnaire were received from 62 members of the EHRA research network. The survey involved high-, medium-, and low-volume implanting centres, performing, respectively, more than 200, 100-199 and under 100 implants per year. The following topics were explored: the side approach for implantation, surgical techniques for pocket incision, first venous access for lead implantation, preference of lead fixation, preferred coil number for implantable cardioverter-defibrillator (ICD) leads, right ventricular pacing site, generator placement site, subcutaneous ICD implantation, specific tools and techniques for cardiac resynchronization therapy (CRT), lead implantation sequence in CRT, coronary sinus cannulation technique, target site for left ventricular lead placement, strategy in left ventricular lead implant failure, mean CRT implantation time, optimization of the atrioventricular (AV) and ventriculo-ventricular intervals, CRT implants in patients with permanent atrial fibrillation, AV node ablation in patients with permanent AF. This panoramic view allows us to find out the operator preferences regarding the techniques and tools for device implantation in Europe. The results showed different practices in all the fields we investigated, nevertheless the survey also outlines a good adherence to the common standards and recommendations.

  13. Implantable electronic medical devices

    CERN Document Server

    Fitzpatrick, Dennis

    2014-01-01

    Implantable Electronic Medical Devices provides a thorough review of the application of implantable devices, illustrating the techniques currently being used together with overviews of the latest commercially available medical devices. This book provides an overview of the design of medical devices and is a reference on existing medical devices. The book groups devices with similar functionality into distinct chapters, looking at the latest design ideas and techniques in each area, including retinal implants, glucose biosensors, cochlear implants, pacemakers, electrical stimulation t

  14. CT guided 125iodine seed implantation for portal vein tumor thrombus in primary hepatocellular carcinoma

    Institute of Scientific and Technical Information of China (English)

    ZHANG Fu-jun; LI Chuan-xing; JIAO De-chao; ZHANG Nian-hua; WU Pei-hong; DUAN Guang-feng; WU Yue-xia

    2008-01-01

    Background This study evaluated the clinical application of CT guided 125iodine implantation in patients with portal vein tumor thrombus in primary hepatocellular carcinoma.Methods The ten patients (9 males and 1 female,aged from 36 to 72 years) with portal vein tumor thrombus accompanying hepatocellular carcinoma had been treated with comprehensive therapy including surgery,transcatheter arterial chemoembolization,radiotherapy ablation,microwave ablation or percutaneous ethanol injection.The average diameter of each tumor thrombus was 21.5 mm×30.5 mm.Seeds of 30 MBq 125I were implanted 5 mm apart within the portal vein tumor thrombus.The follow-up after 4 months included enhanced spiral CT.Results CT screening of the tumours indicated that 4 out of 10 patients showed complete response to the therapy,5 partial response and 1 stable disease.Adverse effects included aggravated abdominal dropsy and temporarily increased transaminase,which were controlled by medical management.Severe complications such as haemorrhage,biliary fistula,hepatic abscess,pancreatic fistula and hepatic function failure were not observed.Implanted seeds migrated to lung and left hepatic lobe in 1 case.Conclusion CT guided implantation of 125iodine seeds,can effectively treat portal vein tumor thrombus accompanying hepatocellular carcinoma with minimal damage and few complications.

  15. COCHLEAR IMPLANTATION: MY EXPERIENCE

    Directory of Open Access Journals (Sweden)

    Shankar

    2015-12-01

    Full Text Available Cochlear implant is a small, surgically implanted complex electronic device that can help to provide a sense of sound to a person with severe to profound sensorineural hearing loss. This type of hearing loss, typically involves damage to hair cells in the cochlea, as a result sound cannot reach the auditory nerve which usually receives information from hair cells. A cochlear implant skips the damaged hair cells and to stimulate the auditory nerve directly. An implant does not restore normal hearing, instead it can give a deaf person a useful representation of sounds in the environment and help him or her to understand speech. I am here presenting this article in relation to the indications, intraoperative and postoperative complications of cochlear implantation in our institute since January 2013. Children who receive implants at earlier age, outperform their peers who are implanted at a later age. This is reflected in all the areas of speech and language development.

  16. A comparative study of zirconium and titanium implants in rat: osseointegration and bone material quality.

    Science.gov (United States)

    Hoerth, Rebecca M; Katunar, María R; Gomez Sanchez, Andrea; Orellano, Juan C; Ceré, Silvia M; Wagermaier, Wolfgang; Ballarre, Josefina

    2014-02-01

    Permanent metal implants are widely used in human medical treatments and orthopedics, for example as hip joint replacements. They are commonly made of titanium alloys and beyond the optimization of this established material, it is also essential to explore alternative implant materials in view of improved osseointegration. The aim of our study was to characterize the implant performance of zirconium in comparison to titanium implants. Zirconium implants have been characterized in a previous study concerning material properties and surface characteristics in vitro, such as oxide layer thickness and surface roughness. In the present study, we compare bone material quality around zirconium and titanium implants in terms of osseointegration and therefore characterized bone material properties in a rat model using a multi-method approach. We used light and electron microscopy, micro Raman spectroscopy, micro X-ray fluorescence and X-ray scattering techniques to investigate the osseointegration in terms of compositional and structural properties of the newly formed bone. Regarding the mineralization level, the mineral composition, and the alignment and order of the mineral particles, our results show that the maturity of the newly formed bone after 8 weeks of implantation is already very high. In conclusion, the bone material quality obtained for zirconium implants is at least as good as for titanium. It seems that the zirconium implants can be a good candidate for using as permanent metal prosthesis for orthopedic treatments.

  17. Commande numérique de moteurs synchrones à aimants permanents de faible puissance

    Science.gov (United States)

    Robyns, B.; Fu, Y.; Labrique, F.; Buyse, H.

    1995-08-01

    High performance motion control with permanent magnet synchronous actuators needs complex control strategies. These control strategies lead frequently to algorithms requiring powerful microprocessors for their digital implementation. In this paper, we consider an approach of the control of small power permanent magnets synchronous actuators which allows to design and to implement control algorithms requiring only a reduced computation power, while maintaining satisfactory static and dynamic performance and a good insensitivity to perturbations and parameter uncertainties. L'actionnement électrique à hautes performances par moteurs synchrones à aimants permanents impose des stratégies de commande évoluées liées au comportement dynamique complexe de ces machines. Ces stratégies de commande conduisent fréquemment à des algorithmes dont l'implantation numérique exige des microprocesseurs ayant une puissance de calcul élevée. Dans cet article, nous développons une approche du problème de la commande des moteurs synchrones à aimants permanents de faible puissance qui permet de concevoir et d'implanter des algorithmes de commande ne nécessitant qu'une puissance de calcul réduite, tout en garantissant des performances statiques et dynamiques satisfaisantes ainsi qu'une bonne insensibilité aux perturbations agissant sur le système et aux incertitudes sur les paramètres.

  18. New permanent magnets; manganese compounds.

    Science.gov (United States)

    Coey, J M D

    2014-02-12

    The exponential growth of maximum energy product that prevailed in the 20th century has stalled, leaving a market dominated by two permanent magnet materials, Nd2Fe14B and Ba(Sr)Fe12O19, for which the maximum theoretical energy products differ by an order of magnitude (515 kJ m(-3) and 45 kJ m(-3), respectively). Rather than seeking to improve on optimized Nd-Fe-B, it is suggested that some research efforts should be devoted to developing appropriately priced alternatives with energy products in the range 100-300 kJ m(-3). The prospects for Mn-based hard magnetic materials are discussed, based on known Mn-based compounds with the tetragonal L10 or D022 structure or the hexagonal B81 structure.

  19. CHALLENGES OF PERMANENT TEACHER TRAINING

    Directory of Open Access Journals (Sweden)

    María Manuela Valles-Ornelas

    2015-07-01

    Full Text Available The new challenges for teachers and managers require to assume permanent formation as a tool for responding effectively and efficiently to them, different perspective to strengthen from the initial teacher education programs. The research was done in a primary school in the state of Chihuahua. The method used was research action, the question was: How can we encourage the lifelong learning and training of the staff of this school, with the purpose to assist them in these processes to improve the service that the school provides to students. The school group is the center of the process, the cooperative and collaborative work accompanied by educational leadership and persuasive provide better results, and all accompanied by the professional selfinvitation.

  20. Intrusive luxation of 60 permanent incisors

    DEFF Research Database (Denmark)

    Tsilingaridis, Georgios; Malmgren, Barbro; Andreasen, Jens O;

    2012-01-01

      Intrusive luxation in the permanent dentition is an uncommon injury but it is considered one of the most severe types of dental trauma because of the risk for damage to the periodontal ligament, pulp and alveolar bone. Management of intrusive luxation in the permanent dentition is controversial....... The purpose of this study was to evaluate pulp survival and periodontal healing in intrusive luxated permanent teeth in relation to treatment alternatives, degree of intrusion and root development....

  1. Dental Interventions on First Permanent Molars

    OpenAIRE

    2016-01-01

    The first permanent molars have the biggest dental morbidity and mortality of all permanent teeth. The main aim was to evaluate of the most common dental problems and procedures that are performed on the first permanent molars. Material and method: examination was performed in three private dental offices, two from urban and one from rural region, over a period of 2 years. The data was obtained by using dental charts from the patients and by the ambulatory register for performe...

  2. Experimental research on distribution of 125 I labeled recombinant fusion protein dTMP-GH in mice%125 I标记重组融合蛋白dTMP-GH在小鼠体内分布的实验研究

    Institute of Scientific and Technical Information of China (English)

    申明强; 陈默; 王崧; 粟永萍; 王军平

    2014-01-01

    Objective To assess the distribution of recombinant fusion protein dTMP-GH in mice and to determine whether it is of tar-geted distribution characteristics. Methods A laboratory scale preparation of dTMP-GH recombinant fusion protein was obtained. Protein dT-MP-GH was labeled with radioactive 125 I,then mice were sacrificed at 5 min,15 min,30 min,1 h,2 h,4 h,8 h,12 h,24 h after tail vein injec-tion of 125 I-dTMP-GH at a dose of 100 μg/kg,and the organs and tissues ( heart,liver,spleen,kidney,bone and thyroid) were collected for radioactive counting. Results Preparation of purified ( >98%) dTMP-G was obtained. 125 I labeling rate was 71. 53%,radiochemical purity was 96. 53%,and specific activity was 0. 22 MBq/μl. 30 min after tail vein injection of 125 I labeled dTMP-GH,radioactivity accounted for 10% of the total injected in femoral,and metabolism was carried via liver and kidney over time. Conclusion Fusion protein mainly distribu-ted in bone marrow via tail vein injection in mice,which expressed that dTMP-GH has the characteristics of selective distribution in bone mar-row tissue.%目的:研究重组融合蛋白dTMP-GH在小鼠体内的分布情况,明确其是否具有靶向分布特点。方法实验室制备dTMP-GH重组融合蛋白;用放射性125 I标记融合蛋白dTMP-GH后,按100μg/kg的标准小鼠尾静脉注射125 I-dTMP-GH,分别于给药后5 min、15 min、30 min、1 h、2 h、4 h、8 h、12 h、24 h取心、肝、脾、肾、股骨、甲状腺等进行放射性计数。结果制备得到纯度大于98%的重组融合蛋白dTMP-GH;125 I标记率为71.53%,放化纯度为96.53%,比活度为0.22 MBq/μl;尾静脉注射125 I标记的dTMP-GH后30 min股骨的放射性计数占到注射总量的10%,并随时间推移经肝脏和肾脏代谢。结论融合蛋白dTMP-GH经尾静脉注射后在小鼠体内主要分布于骨髓,具有骨髓组织偏向分布特点。

  3. Implantes transcigomáticos Traszygomatic implants

    Directory of Open Access Journals (Sweden)

    B. Fernández Ateca

    2004-12-01

    Full Text Available Los implantes cigomáticos, originariamente diseñados por Branemark en 1989, son implantes de cabeza en 45 grados, de 4'5 milímetros de diámetro en su parte más ancha, y que pueden medir entre 30 y 50 milímetros de longitud. Se insertan desde la parte palatina del proceso alveolar, siguiendo la cresta cigomática-alveolar hasta anclarse en el cuerpo del malar, y en el caso de pacientes maxilectomizados, entrando directamente en el cuerpo del malar. Estos implantes ofrecen una alternativa más al cirujano en el momento de planificar un tratamiento protésico-rehabilitador implantosoportado. Sobretodo, en aquellos pacientes con un maxilar superior atrófico en el que no se pueden realizar injertos óseos o estos han fracasado. El objetivo de este artículo es proponer el protocolo quirúrgico de colocación de los implantes trascigomáticos y revisar la literatura actual sobre la evolución clínica de estos implantes.The zygomatic implants, originally designed by Branemark in 1989, are implants with a 45 degree inclined head, 4'5 millimetre diameter at their widest part and measuring between 30 and 50 millimetres in length. They are inserted from the palatine side of the alveolar process, following the zygomatic-alveolar edge and anchor in the body of the zygomatic bone. In the case of maxillectomized patients, they are inserted directly in the body of the malar bone. These implants offer an additional alternative to the surgeon when planning an implant supported rehabilitation treatment; specially in those patients with an atrophic maxilla in which osseous grafts cannot be realized or these grafts have failed. The objective of this article is to propose the surgical,protocol of placement of traszygomatic implants and to check the current literature on the clinical evolution of these implants.

  4. Nickel-induced systemic contact dermatitis and intratubal implants: the baboon syndrome revisited.

    Science.gov (United States)

    Bibas, Nathalie; Lassere, Jacques; Paul, Carle; Aquilina, Christian; Giordano-Labadie, Françoise

    2013-01-01

    Permanent sterilization using intratubal implants is becoming increasingly popular worldwide. We report the first case of a 40-year-old woman presenting a systemic contact dermatitis due to nickel-containing intratubal implants: the Essure system. The diagnosis was confirmed with positive patch test result for nickel and total clearance of dermatitis after removing the implants that contain a metallic spiral of nitinol (alloy of 55% nickel and 45% titanium). Systemic contact dermatitis to the intratubal implants could be explained by the corrosion of nitinol after implantation resulting in the release of nickel. In the literature, no similar case has been reported despite the introduction of intratubal implants since 2002. Dermatologists and gynecologists need to be aware of this type of complication. In practice, a thorough assessment for possible nickel contact dermatitis in a woman undergoing sterilization with Essure is recommended. Preoperative patch testing must be carried out if there is any doubt.

  5. Surface modification of traditional and bioresorbable metallic implant materials for improved biocompatibility

    OpenAIRE

    Walker, Emily Kristine

    2015-01-01

    Due to their strength, elasticity, and durability, a variety of metal alloys are commonly used in medical implants. Traditionally, corrosion-resistant metals have been preferred. These permanent materials can cause negative systemic and local tissue effects in the long-term. Permanent stenting can lead to late-stent thrombosis and in-stent restenosis. Metallic pins and screws for fracture fixation can corrode and fail, cause loss of bone mass, and contribute to inflammation and pain at the im...

  6. Replacement of hopeless retained primary teeth by immediate dental implants: a case report.

    Science.gov (United States)

    de Oliveira, Rafael R; Macedo, Guilherme O; Muglia, Valdir A; Souza, Sérgio L S; Novaes, Arthur B; Taba, Mário

    2009-01-01

    Hopeless retained primary teeth without permanent successors represent a restorative challenge for clinicians, along with esthetic and functional problems for patients. While various treatment approaches for congenitally missing teeth have been proposed, the replacement of a missing tooth with a dental implant offers specific advantages, such as preservation of the alveolar crest and elimination of the need to restore the adjacent teeth, over other options for tooth replacement. The aim of this article was to illustrate the surgical and prosthetic treatment with implants of a patient with primary teeth without permanent successors.

  7. Implant treatment planning considerations.

    Science.gov (United States)

    Kao, Richard T

    2008-04-01

    As dental implants become a more accepted treatment modality, there is a need for all parties involved with implant dentistry to be familiar with various treatment planning issues. Though the success can be highly rewarding, failure to forecast treatment planning issues can result in an increase of surgical needs, surgical cost, and even case failure. In this issue, the focus is on implant treatment planning considerations.

  8. Implants in adolescents.

    Science.gov (United States)

    Shah, Rohit A; Mitra, Dipika K; Rodrigues, Silvia V; Pathare, Pragalbha N; Podar, Rajesh S; Vijayakar, Harshad N

    2013-07-01

    Implants have gained tremendous popularity as a treatment modality for replacement of missing teeth in adults. There is extensive research present on the use of implants in adults, but there is a dearth of data available on the same in adolescents. The treatment planning and execution of implant placement in adolescents is still in its infancy. This review article is an attempt to bring together available literature.

  9. Implants in adolescents

    Directory of Open Access Journals (Sweden)

    Rohit A Shah

    2013-01-01

    Full Text Available Implants have gained tremendous popularity as a treatment modality for replacement of missing teeth in adults. There is extensive research present on the use of implants in adults, but there is a dearth of data available on the same in adolescents. The treatment planning and execution of implant placement in adolescents is still in its infancy. This review article is an attempt to bring together available literature.

  10. Magnetic guns with cylindrical permanent magnets

    DEFF Research Database (Denmark)

    Vokoun, David; Beleggia, Marco; Heller, Luděk

    2012-01-01

    The motion of a cylindrical permanent magnet (projectile) inside a tubular permanent magnet, with both magnets magnetized axially, illustrates nicely the physical principles behind the operation of magnetic guns. The force acting upon the projectile is expressed semi-analytically as derivative...

  11. Comparison of adjustable permanent magnetic field sources

    DEFF Research Database (Denmark)

    Bjørk, Rasmus; Bahl, Christian Robert Haffenden; Smith, Anders;

    2010-01-01

    A permanent magnet assembly in which the flux density can be altered by a mechanical operation is often significantly smaller than comparable electromagnets and also requires no electrical power to operate. In this paper five permanent magnet designs in which the magnetic flux density can be alte...

  12. 22 CFR 401.3 - Permanent offices.

    Science.gov (United States)

    2010-04-01

    ... Relations INTERNATIONAL JOINT COMMISSION, UNITED STATES AND CANADA RULES OF PROCEDURE General § 401.3 Permanent offices. The permanent offices of the Commission shall be at Washington, in the District of... of the Commission shall have full charge and control of said offices, respectively....

  13. Ion implantation technology

    CERN Document Server

    Downey, DF; Jones, KS; Ryding, G

    1993-01-01

    Ion implantation technology has made a major contribution to the dramatic advances in integrated circuit technology since the early 1970's. The ever-present need for accurate models in ion implanted species will become absolutely vital in the future due to shrinking feature sizes. Successful wide application of ion implantation, as well as exploitation of newly identified opportunities, will require the development of comprehensive implant models. The 141 papers (including 24 invited papers) in this volume address the most recent developments in this field. New structures and possible approach

  14. HA-Coated Implant

    DEFF Research Database (Denmark)

    Daugaard, Henrik; Søballe, Kjeld; Bechtold, Joan E

    2014-01-01

    The goal of osseointegration of orthopedic and dental implants is the rapid achievement of a mechanically stable and long lasting fixation between living bone and the implant surface. In total joint replacements of cementless designs, coatings of calcium phosphates were introduced as a means...... of improving the fixation of implants. Of these, hydroxyapatite (HA) is the most widely used and most extensively investigated. HA is highly osseoconductive, and the positive effect is well documented in both basic and long-term clinical research [1–6]. This chapter describes experimental and clinical studies...... evaluating bone-implant fixation with HA coatings....

  15. Finite element modeling of permanent magnet devices

    Science.gov (United States)

    Brauer, J. R.; Larkin, L. A.; Overbye, V. D.

    1984-03-01

    New techniques are presented for finite element modeling of permanent magnets in magnetic devices such as motors and generators. These techniques extend a previous sheet-current permanent magnet model that applies only for straight line B-H loops and rectangular-shaped magnets. Here Maxwell's equations are used to derive the model of a permanent magnet having a general curved B-H loop and any geometric shape. The model enables a nonlinear magnetic finite element program to use Newton-Raphson iteration to solve for saturable magnetic fields in a wide variety of devices containing permanent magnets and steels. The techniques are applied to a brushless dc motor with irregular-shaped permanent magnets. The calculated motor torque agrees well with measured torque.

  16. Gating of Permanent Molds for ALuminum Casting

    Energy Technology Data Exchange (ETDEWEB)

    David Schwam; John F. Wallace; Tom Engle; Qingming Chang

    2004-03-30

    This report summarizes a two-year project, DE-FC07-01ID13983 that concerns the gating of aluminum castings in permanent molds. The main goal of the project is to improve the quality of aluminum castings produced in permanent molds. The approach taken was determine how the vertical type gating systems used for permanent mold castings can be designed to fill the mold cavity with a minimum of damage to the quality of the resulting casting. It is evident that somewhat different systems are preferred for different shapes and sizes of aluminum castings. The main problems caused by improper gating are entrained aluminum oxide films and entrapped gas. The project highlights the characteristic features of gating systems used in permanent mold aluminum foundries and recommends gating procedures designed to avoid common defects. The study also provides direct evidence on the filling pattern and heat flow behavior in permanent mold castings.

  17. Leadership in a (permanent) crisis.

    Science.gov (United States)

    Heifetz, Ronald; Grashow, Alexander; Linsky, Marty

    2009-01-01

    The current economic crisis is not just another rough spell. Today's mix of urgency, high stakes, and uncertainty will continue even after the recession ends. The immediate crisis--which we will get through with policy makers' expert technical adjustments--sets the stage for a sustained, or even permanent, crisis, a relentless series of challenges no one has encountered before. Instead of hunkering down and relying on their familiar expertise to deal with the sustained crisis, people in positions of authority--whether they are CEOs or managers heading up a company initiative--must practice what the authors call adaptive leadership. They must, of course, tackle the underlying causes of the crisis, but they must also simultaneously make the changes that will allow their organizations to thrive in turbulent environments. Adaptive leadership is an improvisational and experimental art, requiring some new practices. Like Julie Gilbert, who overcame internal resistance to reorient Best Buy toward female purchasers, adaptive leaders get things done to meet today's challenges and then modify those things to thrive in tomorrow's world. They also embrace disequilibrium, using turbulence as an opportunity to build crucial new capacities, as Paul Levy did to rescue Beth Israel Deaconess Medical Center from a profound financial crisis. Finally, adaptive leaders, such as Egon Zehnder, the founder of an executive search firm, draw out the leadership skills that reside deep in the organization, recognizing the interdependence of all employees and mobilizing everyone to generate solutions.

  18. Comparison of the binding of [(3)H]nociceptin/orphaninFQ(1-13)NH(2), [(3)H]nociceptin/orphaninFQ(1-17)OH and [(125)I]Tyr(14)nociceptin/orphaninFQ(1-17)OH to recombinant human and native rat cerebrocortical nociceptin/orphanin FQ receptors.

    Science.gov (United States)

    Hashiba, E; Lambert, D G; Farkas, J; Toth, G; Smith, G

    2002-08-01

    Nociceptin/orphanin FQ (N/OFQ) is a 17-amino acid endogenous neuropeptide ligand for the nociceptin receptor (NOP). We have prepared a [(3)H]-labelled truncated N/OFQ peptide, [(3)H]N/OFQ(1-13)NH(2) and compared its binding characteristics with [(3)H]N/OFQ(1-17)OH and [(125)I]Y(14)N/OFQ(1-17)OH in membranes prepared from Chinese hamster ovary cells expressing the recombinant human NOP (CHO(hNOP)) and the rat cerebrocortex. [(3)H]N/OFQ(1-13)NH(2), [(3)H]N/OFQ(1-17)OH and [(125)I]Y(14)N/OFQ(1-17)OH binding to CHO(hNOP) was concentration dependent and saturable with receptor density (B(max)) and radioligand equilibrium dissociation constant (pK(d)) values (mean +/- SEM) of 1043 +/- 58 fmol/mg protein and 10.35 +/- 0.03, 1348 +/- 44 fmol/mg protein and 10.06 +/- 0.04, and 1169 +/- 76 fmol/mg protein and 10.45 +/- 0.06, respectively. In the rat, B(max) and pK(d) values for [(3)H]N/OFQ(1-13)NH(2) and [(3)H]N/OFQ(1-17)OH were 130 +/- 1 fmol/mg protein and 10.70 +/- 0.03, and 157 +/- 4 fmol/mg protein and 10.34 +/- 0.02, respectively. The binding of all radioligands was displaced by a range of peptide and non-peptide ligands. There was a strong correlation (r(2) = 0.92, P = 0.002) between pK(i) values estimated with [(3)H]N/OFQ(1-13)NH(2) and [(3)H]N/OFQ(1-17)OH. No such correlation was observed in comparison with the [(125)I]-labelled peptide (poor agreement with low affinity N/OFQ(1-9)NH(2), Dynorphin-A and Naloxone benzoylhydrazone). We suggest that [(3)H]N/OFQ(1-13)NH(2) may be a useful alternative to [(3)H]N/OFQ(1-17)OH.

  19. Management of peri-implantitis

    OpenAIRE

    Jayachandran Prathapachandran; Neethu Suresh

    2012-01-01

    Peri-implantitis is a site-specific infectious disease that causes an inflammatory process in soft tissues, and bone loss around an osseointegrated implant in function. The etiology of the implant infection is conditioned by the status of the tissue surrounding the implant, implant design, degree of roughness, external morphology, and excessive mechanical load. The microorganisms most commonly associated with implant failure are spirochetes and mobile forms of Gram-negative anaerobes, unless ...

  20. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2012-01-01

    We evaluated the association between radiation therapy and severe capsular contracture or reoperation after 717 delayed breast implant reconstruction procedures (288 1- and 429 2-stage procedures) identified in the prospective database of the Danish Registry for Plastic Surgery of the Breast during...... reconstruction approaches other than implants should be seriously considered among women who have received radiation therapy....

  1. Ion Implantation of Polymers

    DEFF Research Database (Denmark)

    Popok, Vladimir

    2012-01-01

    are discussed. Related to that, the effects of radiothermolysis, degassing and carbonisation are considered. Specificity of depth distributions of implanted into polymers impurities is analysed and the case of high-fluence implantation is emphasised. Within rather broad topic of ion bombardment, the focus...

  2. The Killing Effect on EJ Bladder Cancer Cells by Combination of Radiation-responsive Promoter Conjoined CD Gene and Ionizing Radiation of 125 I%辐射敏感性启动子调控CD基因表达联合125I照射对膀肤癌EJ细胞的杀伤作用

    Institute of Scientific and Technical Information of China (English)

    李玲; 张春丽; 李囡; 康磊; 卢霞; 张丽; 闫平; 王荣福

    2011-01-01

    以脂质体介导的辐射敏感性基因联合胞嘧啶脱氨酶(cytosine deantinase,CD)基因转染膀胱癌EJ细胞,研究放射性核素125 I照射后5-氟胞嘧啶(5-fluorocytosine,5-FC)对转染膀胧癌EJ细胞的杀伤作用.人工合成辐射敏感性启动子E8,将启动子克隆至质粒pCD2的CD基因上游,构建以E8为启动子、CD基因为目的基因的新质粒,并采用DNA测序法测定E8和CD基因的序列;脂质体Lipofectamine2000介导pE8-CD转染膀胧癌EJ细胞,用[3]I照射(吸收剂量为2舜)后,蛋白质免疫印迹分析(Western blot)测定CD蛋白表达;在转染EJ细胞中分别加人不同剂量125 I勺和5-FC,四哇盐比色法(MTT法)测定各组细胞存活率,并以未经125 I勺照射组、未加5-FC组和5-氟尿啼吮(5-FU)组(阳性对照组)进行对照.DNA测序显示构建的pE8-CD质粒含E8启动子及CD基因序列;Westem blot可检测到CD基因表达;125 I加5-FC组细胞存活率明显低于未经125 I照射组及未加5-FC组,与5-FU组相近.这表明放射性核素与基因治疗联合对肿瘤细胞具有协同杀伤作用.%To investigate the killing effect on EJ human bladder cancer cells by combination of radiation-responsive gene promoter conjoined CD/S-FC system and ionizing radiation with radionuclide 125 I, plasmid vector containing synthetic gene promoter E8 responsive to ionizing radiation(IR)and CD gene in downstream was constructed, analyzed by DNA sequencing, and transiently transfected into EJ bladder cancer cells by liposome-mediated method. Expression of downstream CD gene was detected via ionizing radiation of radionuclide 1311 at 2Gy by Western Blot. The killing effect induced by different doses of 125I and 5-FC in plasmid-transfected EJ cells was investigated by MTT colorimetric assay. DNA sequencing demonstrated that the plasmid vector contained E8 promoter and CD gene sequences , Western Blot detected the protein CD, and MTT colorimetric assay showed that the death rate of plasmid

  3. Risk Factors Associated With Complication Rates of Becker-Type Expander Implants in Relation to Implant Survival: Review of 314 Implants in 237 Patients.

    Science.gov (United States)

    Taboada-Suarez, Antonio; Brea-García, Beatriz; Magán-Muñoz, Fernando; Couto-González, Iván; González-Álvarez, Eduardo

    2015-12-01

    Although autologous tissue reconstruction is the best option for breast reconstruction, using implants is still a reliable and simple method, offering acceptable aesthetic results. Becker-type implants are permanent implants that offer a 1-stage reconstructive option. A retrospective study was carried out in our center reviewing the clinical reports of 237 patients, in whom a total of 314 Becker-type prostheses were implanted. Overall survival was calculated using a Kaplan-Meier estimate. Cox proportional hazard models were used to calculate adjusted hazard ratios. At the end of the study, 214 expanders (68.15%) presented no complications, 40 (12.47%) developed significant capsular contracture, in 27 (8.60%) infection occurred, 24 (7.64%) suffered minor complications, and 9 (2.87%) ruptured. The mean survival time of the expanders was 120.41 months (95% CI: 109.62, 131.19). Radiotherapy, chemotherapy, high Molecular Immunology Borstel, age, mastectomy performed previously to the implant, ductal carcinoma, advanced tumoral stage, experience of the surgeon, and Becker 35-type implants were significantly related to a high number of complications in relation to the survival of the implants. Cox regression analysis revealed that the main risk factors for the survival of expander implants included radiotherapy and surgeon experience. The complication hazard ratio or relative risk caused by these 2 factors was 1.976 and 1.680, respectively. One-stage reconstruction using Becker-type expanders is an appropriate, simple, and reliable option in delayed breast reconstruction in patients who have not received radiotherapy and as long as the procedure is carried out by surgeons skilled in the technique.

  4. 起搏器置入后新出现起搏器依赖及右室起搏相关心室不同步研究%Study on new onset of pacemaker dependency and right ventricular pacing-induced ventricular dyssynchrony after permanent pacemaker implantation

    Institute of Scientific and Technical Information of China (English)

    丁军; 吴尚勤; 孙姗; 程爱娟; 李鹏

    2011-01-01

    Objective: The aim of this study is to examine the incidence of new onset of pacemaker dependency and right ventricular pacing-induced ventricular dyssynchrony 5 years after pacing system implantation. Method:The study included 272 patients who showed intrinsic rhythms at the time of implantation. Measure intrinsic rhythms and record the proportion of ventricular pacing for the cases; Pacemaker dependency was defined as the absence of an intrinsic rhythm for 30 seconds when pacemakers were gradually slowed down to 30 beats/min.Right ventricular pacing-induced ventricular dyssynchrony was defined as <50 beats/min of heart rate and ventricular pacing in proportion of 90 %. The patients of pacemaker dependency and right ventricular pacing-induced ventricular dyssynchrony would be given an individual follow-up and advice of pacemaker replacement. Result: New onset of pacemaker dependency was observed in 15(5.5%) of all 272 patients. 4(2.9%) of 136 patients with sick sinus syndrome (SSS) also showed the dependent syndrom and 10 cases were also the dependents among 116 caseswith atrioventricular block (AV block). The patients with <50 beats/min of heart rate and right ventricular pacing in proportion of 90% were 43 (15. 8%) of the 272 cases. Conclusion: The patients with AV block are more likely to become pacemaker dependents than the cases with SSS. The incidence of new onset of pacemaker dependency was about 5. 5 % after 5-year follow-up. During this period, almost 15. 8 % cases represented right ventricular pacing induced ventricular dyssynchrony.%目的:研究置入起搏器5年以上患者新出现起搏器依赖及右室起搏相关心室不同步的情况.方法:选取置入时为非起搏器依赖且置入起搏器已超过5年患者272例进行随访,测量自身心率,记录心室起搏比例;将起搏器心室频率逐渐降至30次/min,观察30 s,无患者自身心律出现,判定为起搏器依赖;将自身心率<50

  5. MUSIC AND COCHLEAR IMPLANTS

    Institute of Scientific and Technical Information of China (English)

    Mao Yitao; Xu Li

    2013-01-01

    Currently, most people with modern multichannel cochlear implant systems can understand speech in qui-et environment very well. However, studies in recent decades reported a lack of satisfaction in music percep-tion with cochlear implants. This article reviews the literature on music ability of cochlear implant users by presenting a systematic outline of the capabilities and limitations of cochlear implant recipients with regard to their music perception as well as production. The review also evaluates the similarities and differences be-tween electric hearing and acoustic hearing regarding music perception. We summarize the research results in terms of the individual components of music (e.g., rhythm, pitch, and timbre). Finally, we briefly intro-duce the vocal singing of prelingually-deafened children with cochlear implants as evaluated by acoustic measures.

  6. Macroscopic simulation of isotropic permanent magnets

    Science.gov (United States)

    Bruckner, Florian; Abert, Claas; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2016-03-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the hysteresis of the magnetic material. Strayfield measurements of an isotropic permanent magnet and simulation results are in good agreement and highlight the importance of a proper description of the isotropic material.

  7. Macroscopic Simulation of Isotropic Permanent Magnets

    CERN Document Server

    Bruckner, Florian; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2015-01-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the hysteresis of the magnetic material. Strayfield measurements of an isotropic permanent magnet and simulation results are in good agreement and highlight the importance of a proper description of the isotropic material.

  8. Benefits and Risks of Cochlear Implants

    Science.gov (United States)

    ... Prosthetics Cochlear Implants Benefits and Risks of Cochlear Implants Share Tweet Linkedin Pin it More sharing options ... Cochlear Implants What are the Benefits of Cochlear Implants? For people with implants: Hearing ranges from near ...

  9. Computing matrix permanent with collective boson operators

    CERN Document Server

    Huh, Joonsuk

    2016-01-01

    Computing permanents of matrices are known to be a classically hard problem that the computational cost grows exponentially with the size of the matrix increases. So far, there exist a few classical algorithms to compute the matrix permanents in deterministic and in randomized ways. By exploiting the series expansion of products of boson operators regarding collective boson operators, a generalized algorithm for computing permanents is developed that the algorithm can handle the arbitrary matrices with repeated columns and rows. In a particular case, the formula is reduced to Glynn's form. Not only the algorithm can be used for a deterministic direct calculation of the matrix permanent but also can be expressed as a sampling problem like Gurvits's randomized algorithm.

  10. Novel Switched Flux Permanent Magnet Machine Topologies

    Institute of Scientific and Technical Information of China (English)

    诸自强

    2012-01-01

    This paper overviews various switched flux permanent magnet machines and their design and performance features,with particular emphasis on machine topologies with reduced magnet usage or without using magnet,as well as with variable flux capability.

  11. Practical considerations for permanent total enclosures

    Energy Technology Data Exchange (ETDEWEB)

    Worrall, M. [Amcec Adsorption Systems, Schaumburg, IL (United States)

    1997-12-31

    This paper considers some of the practical consideration of Permanent Total Enclosures (PTEs) for gravure printing facilities. In particular the dispersion of fugitive losses from the presses by thermal air currents generated by heat from the press dryers.

  12. Permanent Magnet Boosted Modular Switched Reluctance Motor

    Directory of Open Access Journals (Sweden)

    SZABÓ Loránd

    2016-10-01

    Full Text Available This paper deals with the analyses of a novel motor structure obtained by boosting with permanent magnets a formerly studied modular switched reluctance motor. Upon dynamic simulation results the improvements of the proposed motor are emphasized.

  13. Micromachined permanent magnets and their MEMS applications

    Science.gov (United States)

    Cho, Hyoung Jin

    2002-01-01

    In this research, new micromachined permanent magnets have been proposed, developed and characterized for MEMS applications. In realizing micromachined permanent magnets, a new electroplating technique using external magnetic field and a bumper filling technique using a photolithographically defined mold with resin bonded magnetic particles have been developed. The newly developed micromachining techniques allow thick film-type permanent magnet components to be integrated to magnetic MEMS devices with dimensional control and alignment. Permanent magnet arrays with the dimensions ranging from 30 mum to 200 mum have been developed with an energy density up to 2.7 kJ/m3 in precisely defined forms in the micro scale. For the applications of the permanent magnets developed in this work, three novel magnetic MEMS devices such as a bi-directional magnetic actuator, a magnetically driven optical scanner, and a magnetic cell separator have been successfully realized. After design and modeling, each device has been fabricated and fully characterized. The bi-directional actuator with the electroplated permanent magnet array has achieved bi-directional motion clearly and shown good agreement with the analytical and simulated models. The optical scanner has shown linear bi-directional response under static actuation and stable bi-directional scanning performance under dynamic actuation. As a potential BioMEMS application of the developed permanent magnet, the prototype magnetic cell separator using the electroplated permanent magnet strip array has been proposed and demonstrated for magnetic bead patterning. In conclusion, new thick film-type, electroplated CoNiMnP and epoxy resin bonded Sr-ferrite permanent magnets have been developed and characterized, and then, three new magnetic MEMS devices using the permanent magnets such as a bi-directional magnetic actuator, an optical scanner and a magnetic cell separator have been realized in this research. The new micromachined

  14. 磁感应热疗热籽植入用于浅表实体瘤的临床应用初探%Primary Discussion of Clinical Application of Magnetic Induction Thermotherapy with Permanent Particle Implantation in Superficial Solid Tumors

    Institute of Scientific and Technical Information of China (English)

    师颖瑞; 张琳; 席许平; 刘珈; 王晖; 韩亚骞; 金和坤; 周菊梅; 谢冠慧; 谭蕾; 赵江洪; 罗乐

    2013-01-01

    [Objective]To explore the feasibility of magnetic induction thermotherapy in clinical superficial sol-id tumors .[Methods] Three tumors of two patients with breast cancer in our hospital were chosen to receive mag-netic induction thermotherapy .Each tumor received 2 times of thermo seed implantation and 4~8 times of heat therapy .The planned aim temperature was 48 ~ 50℃ ,and the duration was 30mins .[Results] After the first treatment ,the survival time of patients was over 6 months after the first treatment .When the temperature of the target area was higher than 48℃ and the time was longer than 20mins ,the tumors were well controlled .When the temperature was about 45℃ ,the tumors were controlled shortly .But when the temperature was lower than 41℃ , the tumors were out of control .The main side effects were local pain ,edema and skin burn .After expectant inter-vention ,the burned skin got recovered .[Conclusion]Magnetic induction thermotherapy in superficial solid tumors is feasible .Skin involvement is not the contraindication .%[目的]探讨磁感应热疗技术在临床浅表实体肿瘤中的应用可行性。[方法]以本院2例乳腺癌3个肿瘤作为研究对象,进行磁感应加热治疗。每个肿瘤均接受了2次磁热籽植入和4~8次不等的加热治疗,计划治疗目标温度为48~50℃、维持时间30 min。[结果]首次疗程后患者存活时间均超过6个月。当肿瘤靶区内获得≥48℃、20 min时肿瘤控制较好;治疗温度处于45℃左右时肿瘤可短期被控制;低于41℃肿瘤无法控制且有增大。主要毒副作用为局部疼痛、水肿和皮肤灼伤。灼伤经保守治疗后痊愈。[结论]磁感应热疗用于浅表实体瘤初步认为安全有效,具有一定的可行性,皮肤受累不应视为禁忌证。

  15. Sporadic hemiplegic migraine with permanent neurological deficits.

    Science.gov (United States)

    Schwedt, Todd J; Zhou, Jiying; Dodick, David W

    2014-01-01

    By definition, the neurologic impairments of hemiplegic migraine are reversible. However, a few cases of permanent neurologic deficits associated with hemiplegic migraine have been reported. Herein, we present the case of a patient with permanent impairments because of hemiplegic migraine despite normalization of associated brain magnetic resonance imaging abnormalities. Cases like these suggest the need to consider aggressive prophylactic therapy for patients with recurrent hemiplegic migraine attacks.

  16. Macroscopic Simulation of Isotropic Permanent Magnets

    OpenAIRE

    Bruckner, Florian; Abert, Claas; Vogler, Christoph; Heinrichs, Frank; Satz, Armin; Ausserlechner, Udo; Binder, Gernot; Koeck, Helmut; Suess, Dieter

    2015-01-01

    Accurate simulations of isotropic permanent magnets require to take the magnetization process into account and consider the anisotropic, nonlinear, and hysteretic material behaviour near the saturation configuration. An efficient method for the solution of the magnetostatic Maxwell equations including the description of isotropic permanent magnets is presented. The algorithm can easily be implemented on top of existing finite element methods and does not require a full characterization of the...

  17. Quantum Permanents and Hafnians via Pfaffians

    Science.gov (United States)

    Jing, Naihuan; Zhang, Jian

    2016-10-01

    Quantum determinants and Pfaffians or permanents and Hafnians are introduced on the two-parameter quantum general linear group. Fundamental identities among quantum Pf, Hf, and det are proved in the general setting. We show that there are two special quantum algebras among the quantum groups, where the quantum Pfaffians have integral Laurent polynomials as coefficients. As a consequence, the quantum Hafnian is computed by a closely related quantum permanent and identical to the quantum Pfaffian on this special quantum algebra.

  18. Dental Implant Systems

    Directory of Open Access Journals (Sweden)

    Yoshiki Oshida

    2010-04-01

    Full Text Available Among various dental materials and their successful applications, a dental implant is a good example of the integrated system of science and technology involved in multiple disciplines including surface chemistry and physics, biomechanics, from macro-scale to nano-scale manufacturing technologies and surface engineering. As many other dental materials and devices, there are crucial requirements taken upon on dental implants systems, since surface of dental implants is directly in contact with vital hard/soft tissue and is subjected to chemical as well as mechanical bio-environments. Such requirements should, at least, include biological compatibility, mechanical compatibility, and morphological compatibility to surrounding vital tissues. In this review, based on carefully selected about 500 published articles, these requirements plus MRI compatibility are firstly reviewed, followed by surface texturing methods in details. Normally dental implants are placed to lost tooth/teeth location(s in adult patients whose skeleton and bony growth have already completed. However, there are some controversial issues for placing dental implants in growing patients. This point has been, in most of dental articles, overlooked. This review, therefore, throws a deliberate sight on this point. Concluding this review, we are proposing a novel implant system that integrates materials science and up-dated surface technology to improve dental implant systems exhibiting bio- and mechano-functionalities.

  19. Nanotechnology for dental implants.

    Science.gov (United States)

    Tomsia, Antoni P; Lee, Janice S; Wegst, Ulrike G K; Saiz, Eduardo

    2013-01-01

    With the advent of nanotechnology, an opportunity exists for the engineering of new dental implant materials. Metallic dental implants have been successfully used for decades, but they have shortcomings related to osseointegration and mechanical properties that do not match those of bone. Absent the development of an entirely new class of materials, faster osseointegration of currently available dental implants can be accomplished by various surface modifications. To date, there is no consensus regarding the preferred method(s) of implant surface modification, and further development will be required before the ideal implant surface can be created, let alone become available for clinical use. Current approaches can generally be categorized into three areas: ceramic coatings, surface functionalization, and patterning on the micro- to nanoscale. The distinctions among these are imprecise, as some or all of these approaches can be combined to improve in vivo implant performance. These surface improvements have resulted in durable implants with a high percentage of success and long-term function. Nanotechnology has provided another set of opportunities for the manipulation of implant surfaces in its capacity to mimic the surface topography formed by extracellular matrix components of natural tissue. The possibilities introduced by nanotechnology now permit the tailoring of implant chemistry and structure with an unprecedented degree of control. For the first time, tools are available that can be used to manipulate the physicochemical environment and monitor key cellular events at the molecular level. These new tools and capabilities will result in faster bone formation, reduced healing time, and rapid recovery to function.

  20. Permanent magnet system of alpha magnetic spectrometer

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Alpha magnetic spectrometer (AMS) is the first large magnetic spectrometer in space. Its precursor flight was completed successfully in June 1998. The key part of AMS is the permanent magnet system, which was built by the Institute of Electric Engineering, the Institute of High Energy Physics and the Chinese Academy of Launch Vehicle Technology. This system includes a permanent magnet made of high grade NdFeB and a support structure. The unique design of the permanent magnet based on the magic ring fulfills the severe requirements on the magnetic field leakage and the dipole moment for space experiments. The permanent magnet weighs about 2 tons, and provides a geometric acceptance of 0.6 m2 ·sr and an analyzing power BL2 of 0.135 T·m2. It works up to 40℃ without demagnetization. The main structure is a thin double shell, which undergoes the strong magnetic force and torque of the permanent magnet, as well as the large load during launching and landing. The permanent magnet system fulfills the requirements from AMS, and satisfies the strict safety standards of NASA.

  1. Permanent magnet system of alpha magnetic spectrometer

    Institute of Scientific and Technical Information of China (English)

    陈和生

    2000-01-01

    Alpha magnetic spectrometer (AMS) is the first large magnetic spectrometer in space. Its precursor flight was completed successfully in June 1998. The key part of AMS is the permanent magnet system, which was built by the Institute of Electric Engineering, the Institute of High Energy Physics and the Chinese Academy of Launch Vehicle Technology. This system includes a permanent magnet made of high grade NdFeB and a support structure. The unique design of the permanent magnet based on the magic ring fulfills the severe requirements on the magnetic field leakage and the dipole moment for space experiments. The permanent magnet weighs about 2 tons, and provides a geometric acceptance of 0.6 m2·sr and an analyzing power BL2 of 0.135 T·m2. It works up to 40℃ without demagnetization. The main structure is a thin double shell, which undergoes the strong magnetic force and torque of the permanent magnet, as well as the large load during launching and landing. The permanent magnet system fulfills the requirem

  2. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2011-01-01

    the period 1999 to 2006; 239 one-stage procedures and 353 two-stage procedures. The postoperative course through November 2009 was evaluated by cumulative incidence adjusting for competing risks for the selected outcomes; hematoma, infection, seroma, implant rupture, severe capsular contracture (modified.......7% for severe capsular contracture, 32.3% for displacement/asymmetry of the implant and 38.6% for reoperation. When comparing one- and two-stage procedures, we observed significantly higher risk estimates for infection, seroma and extrusion of the implant following two-stage procedures, whereas the risk...

  3. Bioceramics for implant coatings

    Directory of Open Access Journals (Sweden)

    Allison A Campbell

    2003-11-01

    Early research in this field focused on understanding the biomechanical properties of metal implants, but recent work has turned toward improving the biological properties of these devices. This has led to the introduction of calcium phosphate (CaP bioceramics as a bioactive interface between the bulk metal impart and the surrounding tissue. The first CaP coatings were produced via vapor phase processes, but more recently solution-based and biomimetic methods have emerged. While each approach has its own intrinsic materials and biological properties, in general CaP coatings promise to improve implant biocompatibility and ultimately implant longevity.

  4. Biomedical implantable microelectronics.

    Science.gov (United States)

    Meindl, J D

    1980-10-17

    Innovative applications of microelectronics in new biomedical implantable instruments offer a singular opportunity for advances in medical research and practice because of two salient factors: (i) beyond all other types of biomedical instruments, implants exploit fully the inherent technical advantages--complex functional capability, high reliability, lower power drain, small size and weight-of microelectronics, and (ii) implants bring microelectronics into intimate association with biological systems. The combination of these two factors enables otherwise impossible new experiments to be conducted and new paostheses developed that will improve the quality of human life.

  5. EDITORIAL: Permanent revolution - or evolution?

    Science.gov (United States)

    Dobson, Ken

    1998-03-01

    Honorary Editor It was that temporary Bolshevik Leon Trotsky who developed the principle of `permanent revolution', a principle that perhaps characterizes the recent history of education in (south) Britain more than does, say, principles traditionally associated with the Conservative or Labour parties. As this editorial is being written, changes are being made to primary school education, and the long-awaited details of the post-Dearing reorganizing of post-16 education are yet to hit the overful bookshelves and filing cabinets of school heads and examination board officials. But something unique has happened recently which might have surprised even Trotsky. The Secretary of State for Education has set up targets for primary school pupils' attainment and threatened (or promised) to resign if they are not met within the lifetime of our newly elected parliament. Of course, if Mr Blunkett is still in a position to resign at that stage he will have been the longest serving Secretary of State since time immemorial. But we should not carp: this is truly a revolutionary idea. Not the promise to resign - although this idea is not so fashionable now as it once was. The revolutionary idea is that a major change to an educational process is actually being made that carries with it a predicted and testable outcome. By contrast, when school physics was refreshed a generation ago by the introduction of Nuffield courses at both pre- and post-16 stages, no `targets' were set. I and many other physics teachers certainly preferred teaching these to teaching their predecessor syllabuses, and might even dare to assert that the pupils liked them too. But we still don't really know whether or not they learned more - or even better - physics. Very little happened as far as the outside world was concerned: the usual fraction of students gave up physics at the usual ages, and those who were examined didn't really get a better reward for their more up-to-date and more enjoyably learned

  6. Implant-Retained Overdentures for Young Children With Severe Oligodontia : A Series of Four Cases

    NARCIS (Netherlands)

    Filius, Marieke A. P.; Vissink, Arjan; Raghoebar, Gerry M.; Visser, Anita

    2014-01-01

    Purpose: The treatment need is high in children with severe oligodontia and anodontia, because they often have functional and esthetic problems owing to missing teeth. Because the intraforaminal region barely grows after eruption of the permanent mandibular incisors, dental implant treatment should

  7. Dealing with dental implant failures

    Directory of Open Access Journals (Sweden)

    Liran Levin

    2008-06-01

    Full Text Available An implant-supported restoration offers a predictable treatment for tooth replacement. Reported success rates for dental implants are high. Nevertheless, failures that mandate immediate implant removal do occur. The consequences of implant removal jeopardize the clinician's efforts to accomplish satisfactory function and esthetics. For the patient, this usually involves further cost and additional procedures. The aim of this paper is to describe different methods and treatment modalities to deal with dental implant failure. The main topics for discussion include identifying the failing implant, implants replacing failed implants at the exact site, and the use of other restorative options.When an implant fails, a tailor made treatment plan should be provided to each patient according to all relevant variables. Patients should be informed regarding all possible treatment modalities following implant failure and give their consent to the most appropriate treatment option for them.

  8. Combined treatments of laparoscopic microwave ablation and 125I seeds implantation for unresectable hepatocellular carcinoma%腹腔镜下微波消融联合125I粒子植入治疗不可切除肝细胞癌

    Institute of Scientific and Technical Information of China (English)

    李凯; 向国安; 陈开运; 王汉宁; 萧金锋; 贺轲; 段小鹏

    2011-01-01

    目的 对比单纯微波消融,探讨腹腔镜辅助下微波消融联合125I粒子植入治疗不可切除肝细胞癌的安全性及有效性.方法 对我院2005年3月至2010年5月收治的65例不能手术切除的肝细胞癌患者,随机分为单纯微波消融治疗组(30例)和微波消融治疗联合125I粒子植入治疗组(35例),所有患者均行CT增强扫描,并按病灶大小分为A组(最大直径≤5 cm)和B 组(最大直径5.0~9.8 cm).以生存率、局部复发率及治疗相关并发症发生率作为评价标准,比较两种治疗方法的临床治疗效果.结果 65例患者未发生治疗相关死亡.单纯微波消融治疗及联合治疗患者的12、18、24个月生存率分别为87.1%、77.8%、70.2%及89.1%、84.1%、77.9%,差异无统计学意义(P=0.6171).根据肿瘤大小分组分层分析,A组和B组分别单纯微波治疗和联合治疗患者生存率差异无统计学意义.单纯微波消融治疗患者12、18、24个月肿瘤局部复发率分别为9.6%、19.3%、33.0%,联合治疗患者分别为5.7%、11.4%、17.1%,差异无统计学意义(P=0.2530).根据肿瘤大小分组分层分析,B组联合治疗患者局部复发率低于单纯微波消融治疗患者,差异有统计学意义(P=0.0441).单纯微波治疗和联合治疗患者总体治疗相关并发症发生率无统计学差异(36.7%vs.34.3%,P<0.05).结论 腹腔镜辅助下微波消融联合125I粒子植入治疗晚期不可切除肝癌安全有效,特别是对于肿瘤最大直径>5 cm的单发病灶,能有效降低术后局部复发率.

  9. MEMS biomedical implants

    Institute of Scientific and Technical Information of China (English)

    Tai Yuchong

    2012-01-01

    The field of micro-electro-mechanical systems (MEMS) has advanced tremendously for the last 20 years. Most commercially noticeably, the field has successfully advanced from pressure sensors to micro physical sensors, such as accelerometers and gyros, for handheld electronics application. In parallel, MEMS has also advanced into micro total analysis system(TAS) and/or lab-on-a-chip applications. This article would discuss a relatively new but promising future direction towards MEMS biomedical implants. Specifically, Parylene C has been explored to be used as a good MEMS implant material and will be discussed in detail. Demonstrated implant devices, such as retinal and spinal cord implants, are presented in this article.

  10. Superelastic Orthopedic Implant Coatings

    Science.gov (United States)

    Fournier, Eric; Devaney, Robert; Palmer, Matthew; Kramer, Joshua; El Khaja, Ragheb; Fonte, Matthew

    2014-07-01

    The demand for hip and knee replacement surgery is substantial and growing. Unfortunately, most joint replacement surgeries will fail within 10-25 years, thereby requiring an arduous, painful, and expensive revision surgery. To address this issue, a novel orthopedic implant coating material ("eXalt") has been developed. eXalt is comprised of super elastic nitinol wire that is knit into a three-dimensional spacer fabric structure. eXalt expands in vivo to conform to the implantation site and is porous to allow for bone ingrowth. The safety and efficacy of eXalt were evaluated through structural analysis, mechanical testing, and a rabbit implantation model. The results demonstrate that eXalt meets or exceeds the performance of current coating technologies with reduced micromotion, improved osseointegration, and stronger implant fixation in vivo.

  11. Risks of Breast Implants

    Science.gov (United States)

    ... an infection or injury. Demonstrated by redness, swelling, warmth, pain and or/loss of function. Lymphedema or ... Overfilling or underfilling of saline-filled breast implants Physical stresses such as trauma or intense physical pressure ...

  12. Ion implantation induced nanotopography on titanium and bone cell adhesion

    Energy Technology Data Exchange (ETDEWEB)

    Braceras, Iñigo, E-mail: inigo.braceras@tecnalia.com [Tecnalia, Mikeletegi Pasealekua 2, 20009 Donostia-San Sebastian (Spain); CIBER de Bioingeniería, Biomateriales y Nanomedicina (Ciber-BBN) (Spain); Vera, Carolina; Ayerdi-Izquierdo, Ana [Tecnalia, Mikeletegi Pasealekua 2, 20009 Donostia-San Sebastian (Spain); CIBER de Bioingeniería, Biomateriales y Nanomedicina (Ciber-BBN) (Spain); Muñoz, Roberto [Tecnalia, Mikeletegi Pasealekua 2, 20009 Donostia-San Sebastian (Spain); Lorenzo, Jaione; Alvarez, Noelia [Tecnalia, Mikeletegi Pasealekua 2, 20009 Donostia-San Sebastian (Spain); CIBER de Bioingeniería, Biomateriales y Nanomedicina (Ciber-BBN) (Spain); Maeztu, Miguel Ángel de [Private Practice, P° San Francisco, 43 A-1°, 20400 Tolosa (Spain)

    2014-08-15

    Graphical abstract: Titanium surfaces modified by inert ion implantation affect cell adhesion through modification of the nanotopography in the same dimensional range of that of human bone inorganic phases. - Highlights: • Inert ion implantation on Ti modifies surface nanotopography and bone cell adhesion. • Ion implantation can produce nanostructured surfaces on titanium in the very same range as of those of the mineral phase of the human bone. • Appropriate tool for studying the relevance of nanostructured surfaces on bone mineralization and implant osseointegration. • Ion implantation induced nanotopography have a statistically significant influence on bone cell adhesion. - Abstract: Permanent endo-osseous implants require a fast, reliable and consistent osseointegration, i.e. intimate bonding between bone and implant, so biomechanical loads can be safely transferred. Among the parameters that affect this process, it is widely admitted that implant surface topography, surface energy and composition play an important role. Most surface treatments to improve osseointegration focus on micro-scale features, as few can effectively control the effects of the treatment at nanoscale. On the other hand, ion implantation allows controlling such nanofeatures. This study has investigated the nanotopography of titanium, as induced by different ion implantation surface treatments, its similarity with human bone tissue structure and its effect on human bone cell adhesion, as a first step in the process of osseointegration. The effect of ion implantation treatment parameters such as energy (40–80 keV), fluence (1–2 e17 ion/cm{sup 2}) and ion species (Kr, Ar, Ne and Xe) on the nanotopography of medical grade titanium has been measured and assessed by AFM and contact angle. Then, in vitro tests have been performed to assess the effect of these nanotopographies on osteoblast adhesion. The results have shown that the nanostructure of bone and the studied ion implanted

  13. [Improved design of permanent maglev impeller assist heart].

    Science.gov (United States)

    Qian, Kunxi; Zeng, Pei; Ru, Weimin; Yuan, Haiyu

    2002-12-01

    Magnetic bearing has no mechanical contact between the rotor and stator. And a rotary pump with magnetic bearing has therefore no mechanical wear and thrombosis due to bearing. The available magnetic bearings, however, are devised with electric magnets, need complicated control and remarkable energy consumption. Resultantly, it is difficult to apply an electric magnetic bearing to rotary pump without disturbing its simplicity, implantability and reliability. The authors have developed a levitated impeller pump merely with permanent magnets. The rotor is supported by permanent magnetic forces radially. On one side of the rotor, the impeller is fixed; and on the other side of the rotor, the driven magnets are mounted. Opposite to this driven magnets, a driving motor coil with iron corn magnets is fastened to the motor axis. Thereafter, the motor drives the rotor via a rotating magnetic field. By laboratory tests with saline, if the rotor stands still or rotates under 4,000 rpm, the rotor has one-point contact axially with the driving motor coil. The contacting point is located in the center of the rotor. As the rotating speed increases gradually to more than 4,000 rpm, the rotor will detache from the stator axially. Then the rotor will be fully levitated. Since the axial levitation is produced by hydraulic force and the driven magnets have a gyro-effect, the rotor rotates very steadly during levitation. As a left ventricular assist device, the pump works in a rotating speed range of 5,000-8,000 rpm, the levitation of the impeller hence is ensured by practical use of the pump.

  14. 经皮椎体后凸骨水泥成形联合125I放射粒子植入治疗脊柱转移瘤%Percutaneous kyphoplasty combined with 125I for treatment of metastatic spinal tumors

    Institute of Scientific and Technical Information of China (English)

    张纬; 施建党; 牛宁奎; 张峻山; 耿广起

    2014-01-01

    BACKGROUND:Radiotherapy alone is not suitable for tumor-caused vertebral fractures and neurological dysfunction. In recent years, 125I radiation particles have been widely used in a variety of primary or secondary tumors and achieved good results. Percutaneous kyphoplasty can restore vertebral height efficiently, remodel spinal stability, and relieve pain. OBJECTIVE:To evaluate safety and effectiveness of percutaneous kyphoplasty combined with 125I in patients with metastatic spinal tumors. METHODS:A retrospective study was conducted to review 30 cases of metastatic spinal tumors undergoing percutaneous kyphoplasty combined with 125I from March 2011 to July 2012. Symptoms, signs, and imaging findings were col ected and analyzed. Al the patients had a refractoriness back pain. CT scan showed osteolytic changes in the vertebrae. The visual analogue scales, WHO standards for pain relief and Owestry disability index were recorded to analyze the clinical symptoms outcome and recovery of neurological function, and the change of height in abnormal vertebrae was measured. The fol ow-up time was 1 day, 1 month and 6 months postoperatively. RESULTS AND CONCLUSION:Operations in al the 30 patients were done successful y. Al patients got a conspicuous pain relief in 24 hours after operation, and nospinal injury or compression was found. There were significant differences in scores of visual analogue scales, pain levels, Owestry disability index, and the height of vertebral bodies before and after operation (P0.05). Bone cement leakage occurred in the anterior longitudinal ligament (n=2) and intervertebral space (n=2), and no serious complications occurred. Percutaneous kyphoplasty combined with 125I is a safe and effective way to treat metastatic spinal tumors, which can quickly ease the pain caused by spinal tumor, recover the abnormal vertebral height, reduce complications and improve life quality of patients.%背景:针对肿瘤破坏导致的椎体骨折,进而引起

  15. Cochlear Implant in Adults

    Directory of Open Access Journals (Sweden)

    Jaleh Samadi

    2003-09-01

    Full Text Available Cochlear implant is the result of a great combination and collaboration of engineering and medicine. It is mainly because it has the most conflict with the human nervous system among all prosthesis. Cochlear implant helps a child with profound hearing loss to understand and articulate speech and let an adult person with hearing loss communicate with people by phone. Although these wonderful results could not be seen in all patients, will let us know about the great scientific findings.

  16. Contraceptive implants: current perspectives

    Directory of Open Access Journals (Sweden)

    Rowlands S

    2014-09-01

    Full Text Available Sam Rowlands,1,2 Stephen Searle3 1Centre of Postgraduate Medical Research and Education, School of Health and Social Care, Bournemouth University, Bournemouth, United Kingdom; 2Dorset HealthCare, Bournemouth, United Kingdom; 3Sexual Health Services, Chesterfield, United KingdomAbstract: Progestin-only contraceptive implants are a highly cost-effective form of long-acting reversible contraception. They are the most effective reversible contraceptives and are of a similar effectiveness to sterilization. Pregnancies are rare in women using this method of contraception, and those that do occur must be fully investigated, with an ultrasound scan of the arm and serum etonogestrel level if the implant cannot be located. There are very few contraindications to use of implants, and they have an excellent safety profile. Both acceptability and continuation with the method are high. Noncontraceptive benefits include improvements in dysmenorrhea, ovulatory pain, and endometriosis. Problematic bleeding is a relatively common adverse effect that must be covered in preinsertion information-giving and supported adequately if it occurs. Recognized training for both insertion and removal should be undertaken. Care needs to be taken at both insertion and removal to avoid neurovascular injury. Implants should always be palpable; if they are not, noninsertion should be assumed until disproven. Etonogestrel implants are now radiopaque, which aids localization. Anticipated difficult removals should be performed by specially trained experts. Keywords: contraceptive, subdermal implant, etonogestrel, levonorgestrel, progestin-only, long-acting reversible contraception

  17. Biomaterials in cochlear implants

    Directory of Open Access Journals (Sweden)

    Lenarz, Thomas

    2009-01-01

    Full Text Available The cochlear implant (CI represents, for almost 25 years now, the gold standard in the treatment of children born deaf and for postlingually deafened adults. These devices thus constitute the greatest success story in the field of ‘neurobionic’ prostheses. Their (now routine fitting in adults, and especially in young children and even babies, places exacting demands on these implants, particularly with regard to the biocompatibility of a CI’s surface components. Furthermore, certain parts of the implant face considerable mechanical challenges, such as the need for the electrode array to be flexible and resistant to breakage, and for the implant casing to be able to withstand external forces. As these implants are in the immediate vicinity of the middle-ear mucosa and of the junction to the perilymph of the cochlea, the risk exists – at least in principle – that bacteria may spread along the electrode array into the cochlea. The wide-ranging requirements made of the CI in terms of biocompatibility and the electrode mechanism mean that there is still further scope – despite the fact that CIs are already technically highly sophisticated – for ongoing improvements to the properties of these implants and their constituent materials, thus enhancing the effectiveness of these devices. This paper will therefore discuss fundamental material aspects of CIs as well as the potential for their future development.

  18. Biocompatible implant surface treatments.

    Science.gov (United States)

    Pattanaik, Bikash; Pawar, Sudhir; Pattanaik, Seema

    2012-01-01

    Surface plays a crucial role in biological interactions. Surface treatments have been applied to metallic biomaterials in order to improve their wear properties, corrosion resistance, and biocompatibility. A systematic review was performed on studies investigating the effects of implant surface treatments on biocompatibility. We searched the literature using PubMed, electronic databases from 1990 to 2009. Key words such as implant surface topography, surface roughness, surface treatment, surface characteristics, and surface coatings were used. The search was restricted to English language articles published from 1990 to December 2009. Additionally, a manual search in the major dental implant journals was performed. When considering studies, clinical studies were preferred followed by histological human studies, animal studies, and in vitro studies. A total of 115 articles were selected after elimination: clinical studies, 24; human histomorphometric studies, 11; animal histomorphometric studies, 46; in vitro studies, 34. The following observations were made in this review: · The focus has shifted from surface roughness to surface chemistry and a combination of chemical manipulations on the porous structure. More investigations are done regarding surface coatings. · Bone response to almost all the surface treatments was favorable. · Future trend is focused on the development of osteogenic implant surfaces. Limitation of this study is that we tried to give a broader overview related to implant surface treatments. It does not give any conclusion regarding the best biocompatible implant surface treatment investigated till date. Unfortunately, the eventually selected studies were too heterogeneous for inference of data.

  19. MRI induced torque and demagnetization in retention magnets for a bone conduction implant.

    Science.gov (United States)

    Jansson, Karl-Johan Fredén; Håkansson, Bo; Reinfeldt, Sabine; Taghavi, Hamidreza; Eeg-Olofsson, Måns

    2014-06-01

    Performing magnetic resonance imaging (MRI) examinations in patients who use implantable medical devices involve safety risks both for the patient and the implant. Hearing implants often use two permanent magnets, one implanted and one external, for the retention of the external transmitter coil to the implanted receiver coil to achieve an optimal signal transmission. The implanted magnet is subjected to both demagnetization and torque, magnetically induced by the MRI scanner. In this paper, demagnetization and a comparison between measured and simulated induced torque is studied for the retention magnet used in a bone conduction implant (BCI) system. The torque was measured and simulated in a uniform static magnetic field of 1.5 T. The magnetic field was generated by a dipole electromagnet and permanent magnets with two different types of coercive fields were tested. Demagnetization and maximum torque for the high coercive field magnets was 7.7% ± 2.5% and 0.20 ± 0.01 Nm, respectively and 71.4% ± 19.1% and 0.18 ± 0.01 Nm for the low coercive field magnets, respectively. The simulated maximum torque was 0.34 Nm, deviating from the measured torque in terms of amplitude, mainly related to an insufficient magnet model. The BCI implant with high coercive field magnets is believed to be magnetic resonance (MR) conditional up to 1.5 T if a compression band is used around the skull to fix the implant. This is not approved and requires further investigations, and if removal of the implant is needed, the surgical operation is expected to be simple.

  20. A randomized, open-label clinical trial using optical coherence tomography to compare two sirolimus-eluting stents, one with a biodegradable polymer and the other with a permanent polymer.

    Science.gov (United States)

    Tian, Feng; Chen, Yundai; Liu, Changfu; Jin, Qinhua; Chen, Lian; Sun, Zhijun; Liu, Hongbin; Guo, Jun; Gai, Luyue

    2013-04-01

    Intimal hyperplasia appears to differ after implanting a drug-eluting stent (DES) with a biodegradable or a permanent polymer. The aim of the present study was to compare biodegradable with permanent polymer DES, since the available data are limited. One hundred patients with de novo coronary artery stenosis were included in this study. The patients were classified into 2 groups: DES with a biodegradable polymer (n=50) and DES with a permanent polymer (n=50). Optical coherence tomography (OCT) examination was performed before and after stent implantation. A follow‑up OCT, performed 1 year after stent implantation, compared the morphologies of intimal hyperplasia in the 2 groups. The frequencies of uncovered stent struts (2.27 vs. 1.87%, P=0.145) and stent strut malapposition (1.9 vs. 2.02%, P=0.655) upon the first-year follow-up were not significantly different. Average neointimal thickness was lower in the biodegradable compared with the permanent polymer group (106.12±80.65 vs. 181.20±146.96 µm, Pbiodegradable compared with the permanent polymer group (62.1 vs. 35.9%, Pbiodegradable compared with the permanent polymer group (57.7±24.6 vs. 67.6±22.4 µm, Pbiodegradable polymer DES resulted in significantly lower intimal hyperplasia and had well-proportioned intimal coverage compared with permanent polymer DES.

  1. Study on 125I Labeled OxLDL Monoclonal Antibody

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    <正>Atherosclerosis is a common disease, which is a severe threat to human health and life. However, as it has been notoriously difficult to detected early and treat timely. The aim of this study focuses on the

  2. Tricuspid valve repair for torrential tricuspid regurgitation after permanent pacemaker lead extraction.

    Science.gov (United States)

    Mehrotra, Deepak; Kejriwal, Nand K

    2011-01-01

    Tricuspid regurgitation secondary to percutaneous lead extraction is uncommon, and it rarely requires surgical intervention. Most tricuspid regurgitation occurs during the implantation of tined leads, which can be entrapped in the tricuspid valve apparatus and may require immediate withdrawal. Severe tricuspid regurgitation as a sequela of extracting chronically implanted leads has rarely been reported. Herein, we report a case of torrential tricuspid regurgitation in a 67-year-old woman after the extraction of a permanent pacemaker lead. The regurgitation was confirmed on transesophageal echocardiography during lead extraction, and the tricuspid valve was successfully repaired with suture bicuspidization of the valve and the support of ring annuloplasty. A short review of the relevant literature follows the case report.

  3. Permanence and global attractivity for Lotka-Volterra difference systems.

    Science.gov (United States)

    Lu, Z; Wang, W

    1999-09-01

    The permanence and global attractivity for two-species difference systems of Lotka-Volterra type are considered. It is proved that a cooperative system cannot be permanent. For a permanent competitive system, the explicit expression of the permanent set E is obtained and sufficient conditions are given to guarantee the global attractivity of the positive equilibrium of the system.

  4. 31 CFR 515.335 - Permanent resident alien.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 3 2010-07-01 2010-07-01 false Permanent resident alien. 515.335... Definitions § 515.335 Permanent resident alien. As used in § 515.208, the term permanent resident alien means an alien lawfully admitted for permanent residence into the United States....

  5. Implant interactions with orthodontics.

    Science.gov (United States)

    Celenza, Frank

    2012-09-01

    Many situations arise in which orthodontic therapy in conjunction with implant modalities is beneficial, relevant or necessary. These situations might entail orthodontic treatment preparatory to the placement of an implant, such as in the site preparation for implant placement. Traditionally, this has been somewhat well understood, but there are certain guidelines that must be adhered to as well as diagnostic steps that must be followed. Provision of adequate space for implant placement is of paramount importance, but there is also the consideration of tissue manipulation and remodeling which orthodontic therapy can achieve very predictably and orthodontists should be well versed in harnessing and employing this modality of site preparation. In this way, hopeless teeth that are slated for extraction can still be utilized by orthodontic extraction to augment tissues, both hard and soft, thereby facilitating site development. On the corollary, and representing a significant shift in treatment sequencing, there are many situations in which orthodontic mechanotherapy can be simplified, expedited, and facilitated by the placement of an implant and utilization as an integral part of the mechanotherapy. Implants have proven to provide excellent anchorage, and have resulted in a new class of anchorage known as "absolute anchorage". Implants can be harnessed as anchors both in a direct and indirect sense, depending upon the dictates of the case. Further, this has led to the development of orthodontic miniscrew systems and techniques, which can have added features such as flexibility in location and placement, as well as ease of use and removal. As orthodontic appliances evolve, the advent of aligner therapy has become mainstream and well accepted, and many of the aforementioned combined treatment modalities can and should be incorporated into this relatively new treatment modality as well.

  6. Iatrogenic Tumor Implantation

    Institute of Scientific and Technical Information of China (English)

    Ying Ma; Ping Bai

    2008-01-01

    Iatrogenic tumor implantation is a condition that results from various medical procedures used during diagnosis or treatment of a malignancy. It involves desquamation and dissemination of tumor cells that develop into a local recurrence or distant metastasis from the tumor under treatment. The main clinical feature of the condition is nodules at the operation's porous channel or incision, which is easily diagnosed in accordance with the case history. Final diagnosis can be made based on pathological examination. Tumor implantation may occur in various puncturing porous channels, including a laparoscopic port, abdominal wall incision, and perineal incision, etc. Besides a malignant tumor,implantation potential exists with diseases, such as a borderline tumor and endometriosis etc. Once a tumor implantation is diagnosed, or suspected, surgical resection is usually conducted.During the diagnosis and treatment of diseases, avoiding and reducing iatrogenic implantation and dissemination has been regarded as an important principle for surgical treatment of tumors. In a clinical practice setting, if possible, excisional biopsy should be employed, if a biopsy is needed. Repeated puncturing should be avoided during a paracentesis. In a laparoscopic procedure, the tissue is first put into a sample bag and then is taken out from the point of incision. After a laparoscopic procedure, the peritoneum, abdominal muscular fasciae, and skin should be carefully closed, and/or the punctured porous channel be excised. In addition, the sample/tissue should be rinsed with distilled water before surgical closure of the abdominal cavity,allowing the exfoliated tumor cells to swell and rupture in the hypo-osmolar solution. Then surgical closure can be conducted following a change of gloves and equipment. The extent of hysteromyomectomy should as far as possible be away from the uterine cavity. The purpose of this study is to make clinicians aware of the possibility of tumor implantation

  7. A novel graded bioactive high adhesion implant coating

    Energy Technology Data Exchange (ETDEWEB)

    Brohede, Ulrika [Division for Nanotechnology and Functional Materials, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden); Zhao, Shuxi [Division for Solid State Physics, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden); Lindberg, Fredrik [Division for Materials Science, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden); Mihranyan, Albert; Forsgren, Johan [Division for Nanotechnology and Functional Materials, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden); Stromme, Maria, E-mail: maria.stromme@angstrom.uu.se [Division for Nanotechnology and Functional Materials, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden); Engqvist, Hakan, E-mail: hakan.engqvist@angstrom.uu.se [Division for Materials Science, Department of Engineering Sciences, Angstroem Laboratory, Uppsala University, Box 534, 751 21, Uppsala (Sweden)

    2009-06-15

    One method to increase the clinical success rate of metal implants is to increase their bone bonding properties, i.e. to develop a bone bioactive surface leading to reduced risks of interfacial problems. Much research has been devoted to modifying the surface of metals to make them become bioactive. Many of the proposed methods include depositing a coating on the implant. However, there is a risk of coating failure due to low substrate adhesion. This paper describes a method to obtain bioactivity combined with a high coating adhesion via a gradient structure of the coating. Gradient coatings were deposited on Ti (grade 5) using reactive magnetron sputtering with increasing oxygen content. To increase the grain size in the coating, all coatings were post annealed at 385 deg. C. The obtained coating exhibited a gradual transition over 70 nm from crystalline titanium oxide (anatase) at the surface to metallic Ti in the substrate, as shown using cross-section transmission electron microscopy and X-ray photoelectron spectroscopy depth profiling. Using scratch testing, it could be shown that the adhesion to the substrate was well above 1 GPa. The bioactivity of the coating was verified in vitro by the spontaneous formation of hydroxylapatite upon storage in phosphate buffer solution at 37 deg. C for one week. The described process can be applied to implants irrespective of bulk metal in the base and should introduce the possibility to create safer permanent implants like reconstructive devices, dental, or spinal implants.

  8. A novel graded bioactive high adhesion implant coating

    Science.gov (United States)

    Brohede, Ulrika; Zhao, Shuxi; Lindberg, Fredrik; Mihranyan, Albert; Forsgren, Johan; Strømme, Maria; Engqvist, Håkan

    2009-06-01

    One method to increase the clinical success rate of metal implants is to increase their bone bonding properties, i.e. to develop a bone bioactive surface leading to reduced risks of interfacial problems. Much research has been devoted to modifying the surface of metals to make them become bioactive. Many of the proposed methods include depositing a coating on the implant. However, there is a risk of coating failure due to low substrate adhesion. This paper describes a method to obtain bioactivity combined with a high coating adhesion via a gradient structure of the coating. Gradient coatings were deposited on Ti (grade 5) using reactive magnetron sputtering with increasing oxygen content. To increase the grain size in the coating, all coatings were post annealed at 385 °C. The obtained coating exhibited a gradual transition over 70 nm from crystalline titanium oxide (anatase) at the surface to metallic Ti in the substrate, as shown using cross-section transmission electron microscopy and X-ray photoelectron spectroscopy depth profiling. Using scratch testing, it could be shown that the adhesion to the substrate was well above 1 GPa. The bioactivity of the coating was verified in vitro by the spontaneous formation of hydroxylapatite upon storage in phosphate buffer solution at 37 °C for one week. The described process can be applied to implants irrespective of bulk metal in the base and should introduce the possibility to create safer permanent implants like reconstructive devices, dental, or spinal implants.

  9. Design and construction of permanent magnetic gears

    OpenAIRE

    Jørgensen, Frank Thorleif

    2010-01-01

    This thesis deals with design and development of permanent magnetic gears. The goal of this thesis is to develop knowledge and calculation software for magnetic gears. They use strong NdFeB permanent magnets and a new magnetic gear technology, which will be a serious alternative to classical mechanical gears. The new magnetic gear will have a high torque density1 relationship –high efficiency and are maintenance free. In this project was manufactured two test gears which is tested and verifie...

  10. Permanent isolation surface barrier: Functional performance

    Energy Technology Data Exchange (ETDEWEB)

    Wing, N.R.

    1993-10-01

    This document presents the functional performance parameters for permanent isolation surface barriers. Permanent isolation surface barriers have been proposed for use at the Hanford Site (and elsewhere) to isolate and dispose of certain types of waste in place. Much of the waste that would be disposed of using in-place isolation techniques is located in subsurface structures, such as solid waste burial grounds, tanks, vaults, and cribs. Unless protected in some way, the wastes could be transported to the accessible environment via transport pathways, such as water infiltration, biointrusion, wind and water erosion, human interference, and/or gaseous release.

  11. Treatment of ectopic first permanent molar teeth.

    LENUS (Irish Health Repository)

    Hennessy, Joe

    2012-11-01

    Ectopic eruption of the first permanent molar is a relatively common occurence in the developing dentition. A range of treatment options are available to the clinician provided that diagnosis is made early. Non-treatment can result in premature exfoliation of the second primary molar, space loss and impaction of the second premolar. This paper will describe the management of ectopic first permanent molars, using clinical examples to illustrate the available treatment options. CLINICAL RELEVANCE: This paper is relevant to every general dental practitioner who treats patients in mixed dentition.

  12. Identification of Transient and Permanent Faults

    Institute of Scientific and Technical Information of China (English)

    李幼仪; 董新洲; 孙元章

    2003-01-01

    A new algorithm was developed for arcing fault detection based on high-frequency current transients analyzed with wavelet transforms to avoid automatic reclosing on permanent faults. The characteristics of arc currents during transient faults were investigated. The current curves of transient and permanent faults are quite similar since current variation from the fault arc is much less than the voltage variation. However, the fault current details are quite different because of the arc extinguishing and reigniting. Dyadic wavelet transforms were used to identify the current variation since wavelet transform has time-frequency localization ability. Many electric magnetic transient program (EMTP) simulations have verified the feasibility of the algorithm.

  13. Dental Implant Complications.

    Science.gov (United States)

    Liaw, Kevin; Delfini, Ronald H; Abrahams, James J

    2015-10-01

    Dental implants have increased in the last few decades thus increasing the number of complications. Since many of these complications are easily diagnosed on postsurgical images, it is important for radiologists to be familiar with them and to be able to recognize and diagnose them. Radiologists should also have a basic understanding of their treatment. In a pictorial fashion, this article will present the basic complications of dental implants which we have divided into three general categories: biomechanical overload, infection or inflammation, and other causes. Examples of implant fracture, loosening, infection, inflammation from subgingival cement, failure of bone and soft tissue preservation, injury to surround structures, and other complications will be discussed as well as their common imaging appearances and treatment. Lastly, we will review pertinent dental anatomy and important structures that are vital for radiologists to evaluate in postoperative oral cavity imaging.

  14. PROCEDURE FOR ESTIMATING PERMANENT TOTAL ENCLOSURE COSTS

    Science.gov (United States)

    The paper discusses a procedure for estimating permanent total enclosure (PTE) costs. (NOTE: Industries that use add-on control devices must adequately capture emissions before delivering them to the control device. One way to capture emissions is to use PTEs, enclosures t