WorldWideScience

Sample records for charter national mammography

  1. National Transuranic Program Charter

    International Nuclear Information System (INIS)

    The National Transuranic Program Plan and Charter describes the functional elements of the National TRU Program, organizational relationships, programmatic responsibilities, division of work scope among the various DOE organizations that comprise the program, and program baselines against which overall progress will be measured. The charter defines the authorities and responsibilities of various organizations involved in the management of TRU waste throughout the DOE complex

  2. On the Charter Question: Black Marxism and Black Nationalism

    Science.gov (United States)

    Stern, Mark; Hussain, Khuram

    2015-01-01

    This article brings two black intellectual traditions to bear on the question of charter schools: black Marxism and black nationalism. The authors examine the theoretical and rhetorical devices used to talk about charters schools by focusing on how notions of "black liberation" are deployed by the charter movement, and to what end. The…

  3. The United Nations Charter as Constitution of the International Community

    OpenAIRE

    Fassbender, Bardo

    1998-01-01

    The Charter of the United Nations was brought into existence in the form of an international treaty. In the course of the last fifty years, however, the "constitutional predisposition" of the Charter has been confirmed and strengthened in such a way that today the Instrument must be referred to as the constitution of the international community. In this article, the author suggests that the Charter is the constitution of the international community in ist entirety, i.e., for all subjects of i...

  4. Mammography

    Science.gov (United States)

    ... Human Services (HHS) and the American College of Radiology (ACR) recommend screening mammography every year for women, ... a physician specifically trained to supervise and interpret radiology examinations, will analyze the images and send a ...

  5. Charter of the United Nations and statute of the International Court of Justice

    CERN Document Server

    United Nations. New York. Department of Public Information

    1993-01-01

    The Charter of the United Nations was signed on 26 June 1945, in San Francisco, at the conclusion of the United Nations Conference on International Organization, and came into force on 24 October 1945. The Statute of the International Court of Justice is an integral part of the Charter.

  6. 75 FR 29533 - National Advisory Council for Environmental Policy and Technology Notice of Charter Renewal

    Science.gov (United States)

    2010-05-26

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY National Advisory Council for Environmental Policy and Technology Notice of Charter Renewal AGENCY... to the ] Administrator of EPA on a broad range of environmental policy, technology and...

  7. 77 FR 39705 - National Advisory Council for Environmental Policy and Technology; Charter Renewal

    Science.gov (United States)

    2012-07-05

    ... AGENCY National Advisory Council for Environmental Policy and Technology; Charter Renewal AGENCY... (FACA), 5 U.S.C. App. 2, the National Advisory Council for Environmental Policy and Technology (NACEPT... Administrator of EPA on a broad range of environmental policy, technology and management issues. Inquiries...

  8. 76 FR 60848 - National Mammography Quality Assurance Advisory Committee; Notice of Meeting

    Science.gov (United States)

    2011-09-30

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration National Mammography Quality Assurance Advisory Committee; Notice of Meeting AGENCY: Food and Drug Administration, HHS. ACTION: Notice. This notice announces a forthcoming meeting of a public...

  9. 77 FR 15997 - National Medal of Technology and Innovation Nomination Evaluation Committee Charter Renewal

    Science.gov (United States)

    2012-03-19

    ... Technology and Innovation Nomination Evaluation Committee on March 1, 2012. DATES: The Charter for the National Medal of Technology and Innovation Nomination Evaluation Committee was renewed on March 1, 2012... Nomination Evaluation Committee (NMTI Committee) on March 1, 2012. This Notice is published in...

  10. Charter of the United Nations and Statute of the International Court of Justice.

    Science.gov (United States)

    United Nations, New York, NY. Office of Public Information.

    The Charter of the United Nations is divided into 19 chapters. Following a preamble, Chapter I outlines the purposes and principles of the organization; Chapter II, the membership; and Chapter III, organization. Chapter IV describes the composition, functions, powers, and voting procedure of the General Assembly. Chapter V outlines the functioning…

  11. A virtual repository approach to clinical and utilization studies: application in mammography as alternative to a national database.

    OpenAIRE

    Ohno-Machado, L.; Boxwala, A. A.; Ehresman, J.; Smith, D N; Greenes, R. A.

    1997-01-01

    A national mammography database was proposed, based on a centralized architecture for collecting, monitoring, and auditing mammography data. We have developed an alternative architecture relying on Internet-based distributed queries to heterogeneous databases. This architecture creates a "virtual repository", or a federated database which is constructed dynamically, for each query and makes use of data available in legacy systems. It allows the construction of custom-tailored databases at ind...

  12. Results of a 2011 national questionnaire for investigation of mean glandular dose from mammography in Japan

    International Nuclear Information System (INIS)

    Diagnostic reference levels (DRLs) for mammography have yet to be created in Japan. A national questionnaire investigation into radiographic conditions in Japan was carried out for the purpose of creating DRLs. Items investigated included the following: tube voltage; tube current; current–time product; source–image distance; craniocaudal view; automatic exposure control (AEC) settings; name of mammography unit; image receptor system (computed radiography (CR), flat panel detector (FPD), or film/screen (F/S)); and supported or unsupported monitor diagnosis (including monitor resolution). Estimation of the mean glandular dose (MGD) for mammography was performed and compared with previous investigations. The MGD was 1.58(0.48) mGy, which did not significantly differ from a 2007 investigation. In relation to image receptors, although no difference in average MGD values was observed between CR and FPD systems, F/S systems had a significantly decreased value compared to both CR and FPDs. Concerning digital systems (FPDs), the MGD value of the direct conversion system was significantly higher than the indirect conversion system. No significant difference in MGD value was evident concerning type of monitor diagnosis for either the CR or the FPD digital systems; however, hard copies were used more often in CR. No significant difference in the MGD value was found in relation to monitor resolution. This report suggests ways to lower the doses patients undergoing mammography receive in Japan, and serves as reference data for 4.2 cm compressed breast tissue of 50% composition DRLs. Furthermore, our findings suggest that further optimisation of FPD settings can promote a reduction in the MGD value. (paper)

  13. A virtual repository approach to clinical and utilization studies: application in mammography as alternative to a national database.

    Science.gov (United States)

    Ohno-Machado, L; Boxwala, A A; Ehresman, J; Smith, D N; Greenes, R A

    1997-01-01

    A national mammography database was proposed, based on a centralized architecture for collecting, monitoring, and auditing mammography data. We have developed an alternative architecture relying on Internet-based distributed queries to heterogeneous databases. This architecture creates a "virtual repository", or a federated database which is constructed dynamically, for each query and makes use of data available in legacy systems. It allows the construction of custom-tailored databases at individual sites that can serve the dual purposes of providing data (a) to researchers through a common mammography repository and (b) to clinicians and administrators at participating institutions. We implemented this architecture in a prototype system at the Brigham and Women's Hospital to show its feasibility. Common queries are translated dynamically into database-specific queries, and the results are aggregated for immediate display or download by the user. Data reside in two different databases and consist of structured mammography reports, coded per BIRADS Standardized Mammography Lexicon, as well as pathology results. We prospectively collected data on 213 patients, and showed that our system can perform distributed queries effectively. We also implemented graphical exploratory analysis tools to allow visualization of results. Our findings indicate that the architecture is not only feasible, but also flexible and scaleable, constituting a good alternative to a national mammography database. PMID:9357650

  14. Transition from film to digital mammography: Impact for breast cancer screening through the national breast and cervical cancer early detection program

    NARCIS (Netherlands)

    N.T. van Ravesteyn (Nicolien); L. Van Lier (Lisanne); C.B. Schechter (Clyde); D.U. Ekwueme (Donatus U.); J. Royalty (Janet); J.W. Miller (Jacqueline W.); A.M. Near (Aimee); K.A. Cronin (Kathleen); E.A.M. Heijnsdijk (Eveline); J.S. Mandelblatt (Jeanne); H.J. de Koning (Harry)

    2015-01-01

    textabstractIntroduction The National Breast and Cervical Cancer Early Detection Program (NBCCEDP) provides mammograms and diagnostic services for low-income, uninsured women aged 40-64 years. Mammography facilities within the NBCCEDP gradually shifted from plain-film to digital mammography. The pur

  15. More Middle-Class Families Choose Charters

    Science.gov (United States)

    Whitmire, Richard

    2015-01-01

    The rise in middle-class students attending charter schools is largely masked by the overall growth of charter schools: over the last five years, the number of charter schools has grown nationally from 4,690 to just over 6,000. There are now 43 communities where at least 20 percent of the students attend charters, reports the National Alliance for…

  16. Inconsistent self-reported mammography history: Findings from the National Population Health Survey longitudinal cohort

    Directory of Open Access Journals (Sweden)

    Snider Judy

    2004-11-01

    Full Text Available Abstract Background Self-reported information has commonly been used to monitor mammography utilization across populations and time periods. However, longitudinal investigations regarding the prevalence and determinants of inconsistent responses over time and the impact of such responses on population screening estimates are lacking. Methods Based on longitudinal panel data for a representative cohort of Canadian women aged 40+ years (n = 3,537 assessed in the 1994–95 (baseline and 1996–97 (follow-up National Population Health Survey (NPHS, we examined the prevalence of inconsistent self-reports of mammography utilization. Logistic regression models were used to estimate the associations between women's baseline sociodemographic and health characteristics and 2 types of inconsistent responses: (i baseline reports of ever use which were subsequently contradicted by follow-up reports of never use; and (ii baseline reports of never use which were contradicted by follow-up reports of use prior to 1994–95. Results Among women who reported having a mammogram at baseline, 5.9% (95% confidence interval (CI: 4.6–7.3% reported at follow-up that they had never had one. Multivariate logistic regression analyses showed that women with such inconsistent responses were more often outside target age groups, from low income households and less likely to report hormone replacement therapy and Pap smear use. Among women reporting never use at baseline and ever use at follow-up, 17.4% (95%CI: 11.7–23.1% reported their most recent mammogram as occurring prior to 1994–95 (baseline and such responses were more common among women aged 70+ years and those in poorer health. Conclusions Women with inconsistent responses of type (i, i.e., ever users at baseline but never users at follow-up, appeared to exhibit characteristics typical of never users of mammography screening. Although limited by sample size, our preliminary analyses suggest that type (ii

  17. Charter School Contracts. Policy Guide

    Science.gov (United States)

    Cass, Rebecca

    2009-01-01

    The charter school concept was first introduced in 1991 when the Minnesota Legislature passed the nation's first charter school law. As of this writing in 2009, 40 states and the District of Columbia have charter school legislation. While the specific characteristics and nuances of these laws vary from state to state, almost every state law…

  18. Charter Schools as Nation Builders: Democracy Prep and Civic Education. Policy Brief 4

    Science.gov (United States)

    Lautzenheiser, Daniel; Kelly, Andrew P.

    2013-01-01

    This policy brief is the first in a series of in-depth case studies exploring how top-performing charter schools have incorporated civic learning in their school curriculum and school culture. This paper introduces Democracy Prep, a network of seven public charter schools with a civic mission at its core. Democracy Prep's founder and…

  19. MedlinePlus: Mammography

    Science.gov (United States)

    ... you have a lump or other sign of breast cancer. Screening mammography is the type of mammogram that checks ... Have Increased Risk of Death (National Cancer Institute) Breast Cancer Screening Rates (Centers for Disease Control and Prevention) Experimental ...

  20. Integrated Forest Management Charter

    Energy Technology Data Exchange (ETDEWEB)

    Hansen, Leslie A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-08-24

    The purpose of this charter is to establish, maintain, and implement programs for the protection, preservation, and enhancement of the land and water resources of Los Alamos National Laboratory in a changing climate.

  1. The National Digital Stewardship Alliance Charter: Enabling Collaboration to Achieve National Digital Preservation

    OpenAIRE

    Anderson, Martha; Gallinger, Michelle; Potter, Abigail

    2009-01-01

    The Library of Congress proposes extending the success of the NDIIPP (National Digital Information Infrastructure and Preservation Program) network by forming a national stewardship alliance of committed digital preservation partners.

  2. Pelagic Charter Boat Patrons (1999-2001)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This study describes several aspects of the charter fishing experience, including patrons' motivations for coming to Hawaii and going charter fishing, their related...

  3. Digital mammography

    International Nuclear Information System (INIS)

    This state-of-the-art reference book provides in-depth coverage of all aspects of digital mammography, including detector technology, image processing, computer-aided diagnosis, soft-copy reading, digital workflow, and PACS. Specific advantages and disadvantages of digital mammography in comparison to screen-film mammography are thoroughly discussed. By including authors from both North America and Europe, the book is able to outline variations in the use, acceptance, and quality assurance of digital mammography between the different countries and screening programs. Advanced imaging techniques and future developments such as contrast mammography and digital breast tomosynthesis are also covered in detail. All of the chapters are written by internationally recognized experts and contain numerous high-quality illustrations. This book will be of great interest both to clinicians who already use or are transitioning to digital mammography and to basic scientists working in the field. (orig.)

  4. Screening mammography. A missed clinical opportunity? Results of the NCI [National Cancer Institute] Breast Cancer Screening Consortium and national health interview survey studies

    International Nuclear Information System (INIS)

    Data from seven studies sponsored by the National Cancer Institute (NCI) were used to determine current rates of breast cancer screening and to identify the characteristics of and reasons for women not being screened. All seven studies were population-based surveys of women aged 50 to 74 years without breast cancer. While over 90% of non-Hispanic white respondents had regular sources of medical care, 46% to 76% had a clinical breast examination within the previous year, and only 25% to 41% had a mammogram. Less educated and poorer women had fewer mammograms. The two most common reasons women gave for never having had a mammogram were that they did not known they needed it and that their physician had not recommended it. Many physicians may have overlooked the opportunity to recommend mammography for older women when performing a clinical breast examination and to educate their patients about the benefit of screening mammography

  5. Heterogeneity in mammography use across the nation: separating evidence of disparities from the disproportionate effects of geography

    Directory of Open Access Journals (Sweden)

    Clayton Laurel

    2008-06-01

    Full Text Available Abstract Background Mammography is essential for early detection of breast cancer and both reduced morbidity and increased survival among breast cancer victims. Utilization is lower than national guidelines, and evidence of a recent decline in mammography use has sparked concern. We demonstrate that regression models estimated over pooled samples of heterogeneous states may provide misleading information regarding predictors of health care utilization and that comprehensive cancer control efforts should focus on understanding these differences and underlying causal factors. Our study population includes all women over age 64 with breast cancer in the Surveillance Epidemiology and End Results (SEER cancer registries, linked to a nationally representative 5% reference sample of Medicare-eligible women located in 11 states that span all census regions and are heterogeneous in racial and ethnic mix. Combining women with and without cancer in the sample allows assessment of previous cancer diagnosis on propensity to use mammography. Our conceptual model recognizes the interplay between individual, social, cultural, and physical environments along the pathways to health care utilization, while delineating local and more distant levels of influence among contextual variables. In regression modeling, we assess individual-level effects, direct effects of contextual factors, and interaction effects between individual and contextual factors. Results Pooling all women across states leads to quite different conclusions than state-specific models. Commuter intensity, community acculturation, and community elderly impoverishment have significant direct impacts on mammography use which vary across states. Minorities living in isolated enclaves with others of the same race/ethnicity may be either advantaged or disadvantaged, depending upon the place studied. Conclusion Careful analysis of place-specific context is essential for understanding differences across

  6. Ultrasonic mammography

    International Nuclear Information System (INIS)

    608 women are examined by means of ultrasonic mammography during the period of 1 year. 432 patients were examined with the compound method with the U.I. Octoson, a water tank scanner, and 176 patients with the real time method with a directly connected linear-array-scanner. The following results were obtained at the end of the examination period: In the ultrasonic and also in the X-ray mammogram tumour diameters can be determined with an error rate of +- 30%. In the diagnosing of carcinomas, a significant dependence of the exactness on the sice of the tumour is found for the combination of the five methods tested (clinical examination, X-ray mammography, ultrasonic mammography, thermography, cytology). Classifying the individual methods with regard to their exactness, X-ray mammography ranks in front of ultrasonic mammography. Mastopathic changes in the breast can be screened by means of ultrasonic mammography. The structure of the changes can be determined more exactly than with an X-ray picture which is due to the possibility of differentiating solid and cystic structures. In diagnosing fibro-adenomas and establishing diagnoses on young women with dense gland bodies, ultrasonic mammography is superior to radiology both in the ability of screening a finding of a fibro-adenoma (US=88%, X-ray=75%) and in the possibility of classifying it as ''more benign than malignant''. (orig./MG)

  7. Charter Schools and Race: A Lost Opportunity for Integrated Education

    OpenAIRE

    Erica Frankenberg; Chungmei Lee

    2003-01-01

    Segregation patterns in the nation's charter schools are studied. After reviewing state charter legislation that directly addresses issues of racial and ethnic balance of student enrollment, we briefly examine the racial composition and segregation of the charter school population nationally. School-level analyses, aggregated by state constitute the primary method of studying segregation in charter schools. First, we look at racial composition and segregation of charter schools by state. Then...

  8. Details from the Dashboard: Charter Schools by Geographic Region

    Science.gov (United States)

    National Alliance for Public Charter Schools, 2012

    2012-01-01

    While a majority of charter schools nationwide operate in urban and suburban areas, charter schools exist in all corners of the nation, and are expanding into all types of communities. This "Details from the Dashboard" report presents statistics on the number of charter schools and students enrolled in charter schools by the four geographic…

  9. Mammography Facilities

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Mammography Facility Database is updated periodically based on information received from the four FDA-approved accreditation bodies: the American College of...

  10. Charter Halibut Limited Access Program

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This limited access system limits the number of charter vessels that may participate in the guided sport fishery for halibut in area 2C and 3A. NMFS issues a...

  11. An Analysis of the Charter School Facility Landscape in New Jersey

    Science.gov (United States)

    National Alliance for Public Charter Schools, 2013

    2013-01-01

    In spring of 2012, the New Jersey Charter Schools Association, the Colorado League of Charter Schools, and the National Alliance for Public Charter Schools worked to collect evidence that would accurately portray both the adequacy of charter school facilities and the average spending for facilities out of charter schools' operating budgets in New…

  12. An Analysis of the Charter School Facility Landscape in Rhode Island

    Science.gov (United States)

    National Alliance for Public Charter Schools, 2013

    2013-01-01

    In winter of 2013, the Rhode Island League of Charter Schools, the Colorado League of Charter Schools, and the National Alliance for Public Charter Schools worked to collect evidence that would accurately portray both the adequacy of charter school facilities and the average amount of operating funds spent by charter schools on facilities.…

  13. 75 FR 43492 - Federal Advisory Committee; National Security Education Board; Charter Renewal

    Science.gov (United States)

    2010-07-26

    ... emphasized in other United States study abroad programs, such as countries in which few United States students are studying and countries which are of importance to the national security interests of...

  14. 3 CFR 8372 - Proclamation 8372 of May 4, 2009. National Charter Schools Week, 2009

    Science.gov (United States)

    2010-01-01

    ... high-quality education that delivers the knowledge and skills needed to succeed, and that young men and... dedication and commitment to achievement in education. They are models of excellence and are promoting the interests of our children, our economy, and our Nation as a whole. NOW, THEREFORE, I, BARACK...

  15. Charter Schools and Race: A Lost Opportunity for Integrated Education

    Directory of Open Access Journals (Sweden)

    Erica Frankenberg

    2003-09-01

    Full Text Available Segregation patterns in the nation's charter schools are studied. After reviewing state charter legislation that directly addresses issues of racial and ethnic balance of student enrollment, we briefly examine the racial composition and segregation of the charter school population nationally. School-level analyses, aggregated by state constitute the primary method of studying segregation in charter schools. First, we look at racial composition and segregation of charter schools by state. Then, we consider the differences in segregation between non-charter public schools (or simply "public schools" for convenience and charter schools, as well as segregation within the charter school sector. We conclude with a discussion of the article's findings and recommendations to promote further racial equity in this growing sector of public schools.

  16. Charter School Parents and Their Perceptions of Independent Schools

    Science.gov (United States)

    Torres, Amada

    2014-01-01

    Given that independent schools have started to face competition from charter schools, the National Association of Independent Schools (NAIS) commissioned a study with current and prospective charter school parents to determine their perceptions of charter vs. independent schools, assess the relative impact of the variables that affect their school…

  17. Charter Schools, Civil Rights and School Discipline: A Comprehensive Review

    Science.gov (United States)

    Losen, Daniel J.; Keith, Michael A., II; Hodson, Cheri L.; Martinez, Tia E.

    2016-01-01

    This report, along with the companion spreadsheet, provides the first comprehensive description ever compiled of charter school discipline. In 2011-12, every one of the nation's 95,000 public schools was required to report its school discipline data, including charter schools. This analysis, which includes more than 5,250 charter schools, focuses…

  18. Academic Achievement of Students in a Charter Homeschool

    Science.gov (United States)

    Leeds, Mary A.

    2009-01-01

    A recent development in education is the public charter school as a homeschool model. In several states across the nation, a child may enroll in an independent study program of a public charter school and base his or her studies in the home. This model in the realm of education is called charter homeschool. The state of California has over 120…

  19. Mammography quality assurance in Morocco

    International Nuclear Information System (INIS)

    The 'Centre National de l'Energie, des Sciences et des Techniques Nucleaires' (CNESTEN) realised, from February 1999 to March 2000, a quality control of 41 mammography facilities in Morocco. The protocol and standards adopted for achieving the control of elements constituting the mammography chain are those elaborated by GIM and Qualix association. Statistics and conformities results are presented. The program was performed in order to demonstrate to the practitioners in mammography field, the utility and necessity to have a national quality assurance policy. The main objective of CNESTEN is to be accredited by the Moroccan government as a reference laboratory in quality control and dose evaluation in medical imaging and radiotherapy. To achieve this goal the CNESTEN has set up Medical Physic Unit well trained and equipped with the necessary instruments. (author)

  20. Hawaii Charter Fishing Cost Earnings Survey 2012

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data represent a cost-earnings study of the main Hawaiian Island Charter fishing fleet in 2012. Data collected include fisher classification, vessel...

  1. 29 CFR 1912a.12 - Charter.

    Science.gov (United States)

    2010-07-01

    ... Relating to Labor (Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR (CONTINUED) NATIONAL ADVISORY COMMITTEE ON OCCUPATIONAL SAFETY AND HEALTH § 1912a.12 Charter. The Committee shall... enactment of the Occupational Safety and Health Act....

  2. FDA Certified Mammography Facilities

    Science.gov (United States)

    ... Products Radiation-Emitting Products Home Radiation-Emitting Products Mammography Quality Standards Act and Program Consumer Information (MQSA) ... it Email Print This list of FDA Certified Mammography Facilities is updated weekly. If you click on ...

  3. 75 FR 1595 - Pacific Halibut Fisheries; Limited Access for Guided Sport Charter Vessels in Alaska

    Science.gov (United States)

    2010-01-12

    ... FR 554). Under this rule, NMFS will issue a charter halibut permit to the owner of a licensed charter..., 2009 (74 FR 18178) and in the final rule published on January 5, 2010 (75 FR 554). This 60-day... Guided Sport Charter Vessels in Alaska AGENCY: National Marine Fisheries Service (NMFS), National...

  4. Experience with digital mammography

    Directory of Open Access Journals (Sweden)

    G. P. Korzhenkova

    2011-01-01

    Full Text Available The use of digital techniques in mammography has become a last step for completing the process of digitization in diagnostic imaging. It is assumed that such a spatial decision will be required for digital mammography, as well as for high-resolution intensifying screen-film systems used in conventional mammography and that the digital techniques will be limited by the digitizer pixel size on detecting minor structures, such as microcalcifications. The introduction of digital technologies in mammography involves a tight control over an image and assures its high quality.

  5. Comparison of standard reading and computer aided detection (CAD) on a national proficiency test of screening mammography

    International Nuclear Information System (INIS)

    Objective: To evaluate the role of computer aided detection (CAD) in improving the interpretation of screening mammograms Material and methods: Ten radiologists underwent a proficiency test of screening mammography first by conventional reading and then with the help of CAD. Radiologists were blinded to test results for the whole study duration. Results of conventional and CAD reading were compared in terms of sensitivity and recall rate. Double reading was simulated combining conventional readings of four expert radiologists and compared with CAD reading. Results: Considering all ten readings, cancer was identified in 146 or 153 of 170 cases (85.8 vs. 90.0%; χ2=0.99, df=1, P=0.31) and recalls were 106 or 152 of 1330 cases (7.9 vs. 11.4%; χ2=8.69, df=1, P=0.003) at conventional or CAD reading, respectively. CAD reading was essentially the same (sensitivity 97.0 vs. 96.0%; χ2=7.1, df=1, P=0.93; recall rate 10.7 vs. 10.6%; χ2=1.5, df=1, P=0.96) as compared with simulated conventional double reading. Conclusion: CAD reading seems to improve the sensitivity of conventional reading while reducing specificity, both effects being of limited size. CAD reading had almost the same performance of simulated conventional double reading, suggesting a possible use of CAD which needs to be confirmed by further studies inclusive of cost-effective analysis

  6. Quality Assurance Programme for Digital Mammography

    International Nuclear Information System (INIS)

    The application of radiation for the diagnosis and treatment of disease is an important component of the work of the IAEA. In the area of diagnostic radiology, this work is focused on quality assurance (QA) methods to promote the effective use of radiation for diagnostic outcome through achieving and maintaining appropriate image quality, and on dose determination to allow the monitoring and reduction of dose to the patient. The role of mammography in the timely detection of breast cancer is well established. Recent technological developments have seen extensive application of digital techniques to mammography in many Member States. This technology allows remote diagnosis, thus improving patient outcomes in remote or under-resourced settings. The need for QA of and technical information on digital mammography is critical, as many of the implications of a transition to digital technology are not well understood. Currently there is a small number of QA protocols in digital mammography that apply to limited national and regional settings. Many Member States, therefore, have requested guidance in this area. In responding to these requests, the current publication was written with the aim of presenting an internationally harmonized approach to QA in the field. This approach will allow Member States to implement QA of mammography in a standardized way. This is needed to improve the effectiveness of national programmes that underpin population screening in the fight against breast cancer. This publication on QA of digital mammography was developed as a companion to the recently published Quality Assurance Programme for Screen Film Mammography (IAEA Human Health Series No. 2) and follows the same format and style. Since 2007, the IAEA has convened three consultants meetings to prepare the present publication. Additional work undertaken by this group includes the field testing of a number of new phantoms and test equipment developed for the digital environment, and the

  7. Teacher Turnover in Charter Schools. Research Brief

    Science.gov (United States)

    Stuit, David; Smith, Thomas M.

    2010-01-01

    The current study aimed to contribute to a deeper understanding of the organizational conditions of charter schools by examining teacher turnover. Using data from the National Center for Education Statistics (NCES) 2003-04 Schools and Staffing Survey (SASS) and the Teacher Follow-Up Survey (TFS), researchers from the National Center on School…

  8. Charter Schools and the Risk of Increased Segregation

    Science.gov (United States)

    Rotberg, Iris C.

    2014-01-01

    This article examines a wide array of research on the link between school choice programs and student segregation and draws implications for the Obama Administration's policy promoting the national expansion of charter schools. The research demonstrates how the proliferation of charter schools risks increasing current levels of segregation…

  9. 78 FR 57903 - Aerospace Safety Advisory Panel; Charter Renewal

    Science.gov (United States)

    2013-09-20

    ... SPACE ADMINISTRATION Aerospace Safety Advisory Panel; Charter Renewal AGENCY: National Aeronautics and Space Administration (NASA). ACTION: Notice of renewal and amendment of the charter of the Aerospace... the Aerospace Safety Advisory Panel is in the public interest in connection with the performance...

  10. Charter School Path Paved with Choice, Compromise, Common Sense

    Science.gov (United States)

    Junge, Ember Reichgott

    2014-01-01

    A state legislator who played a key role in enacting the nation's first charter school law in Minnesota tells the story of shaping the ideas and the bill. She now looks for ways that charter schools can coexist with traditional public schools to deliver a better education for all children.

  11. Frequently Asked Questions about Digital Mammography

    Science.gov (United States)

    ... Consumer Information (MQSA) Frequently Asked Questions About Digital Mammography Share Tweet Linkedin Pin it More sharing options ... mammography exams, such as DBT? What is digital mammography? Full field digital mammography (FFDM, also known simply ...

  12. Quality assurance in mammography

    International Nuclear Information System (INIS)

    Guidelines in mammography are given, including competence of staff, performance of equipment and quality control procedures. The purpose of the guidelines is to ensure optimum diagnostic quality. 5 refs

  13. Mammography and radiation dose

    International Nuclear Information System (INIS)

    The physical aspects of mammography have been investigated by a commissioned group of physicists at six centers in the United States. Continuous monitoring of the various centers has established sound reproducible data. The 1976 evaluation of 63 systems used in 29 screening centers indicated an average dose to the skin of 2.2 rads per exposure. With high resolution mammography in 2000 asymptomatic women over 35 years of age in a screening program at Emory University, 19 cancers were demonstrated; only one was palpable after localization by mammography, the only one with an axillary lymph node metastasis. Each study required an average of less than 1.5 rads to the fibroglandular tissue of the breasts. Mammography is most useful in the 35 to 50 year age group but should not be denied to younger symptomatic or asymptomatic women

  14. Screening for breast cancer with mammography

    DEFF Research Database (Denmark)

    Gøtzsche, Peter C; Nielsen, Margrethe

    2009-01-01

    BACKGROUND: A variety of estimates of the benefits and harms of mammographic screening for breast cancer have been published and national policies vary. OBJECTIVES: To assess the effect of screening for breast cancer with mammography on mortality and morbidity. SEARCH STRATEGY: We searched Pub...

  15. Survey of mammography practices

    International Nuclear Information System (INIS)

    Of the 319 radiologists who responded to a survey concerning mammography practices, 50% were employed in a private hospital and 26% in a private office. Film-screen mammography was used most often (54%) followed by xeromammography (30%) and a combination of film-screen and xeromammography (16%). Of the respondents, 62% had changed their method of performing mammography in the last 10 years. Of these, 50% had switched from xeromammography to film-screen, 23% from direct film to film-screen, 15% from direct film to xeromammography, and 6% from film-screen to xeromammography. Mammographic equipment had been purchased by 71% of respondents after 1983. Most respondents (71%) monitored mammography equipment doses, usually at 6- to 12-month intervals. Manual breast examinations were done at the time of mammography at 42% of the facilities, and breast self-examination was taught at 32%. For screening, 87.4% used a two-view examination, 92% required the name of a referring physician to whom the report could be sent, 28% accepted self-referred patients, and only 12% charged a reduced fee for screening. Breast sonography was performed by 53% (93% hand-held vs 7% automated), but none used sonography for screening. Only one respondent reported using thermography; three used light scanning. A need for postgraduate mammography courses for radiologists was indicated by 81%, while 69% recommended technologist courses and 64% recommended 1-week fellowships for radiologists

  16. Studies Spotlight Charter Schools Aimed at Diversity

    Science.gov (United States)

    Zubrzycki, Jaclyn

    2012-01-01

    Nearly six decades after "Brown" v. "Board of Education," the landmark U.S. Supreme Court decision that ushered in an era of efforts to integrate public schools, charter school advocates and researchers are shining a light on a number of those independent public schools that are integrated by design. Two new reports--one from the National Alliance…

  17. AFSC/REFM: Alaska Saltwater Sport Fishing Charter Business Survey

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The purpose of this project was to collect cost, earning, and employment information from the Alaska saltwater sport fishing charter business sector during the...

  18. Implementation of Quality Control Protocol in Mammography: A Serbian Experience

    International Nuclear Information System (INIS)

    Mammography is method of choice for early detection of breast cancer. In Serbia, mammography is performed only clinically, although there is a long term plan to introduce mammography as screening method. Currently there are 60 mammography units in practice in Serbia, resulting with 70 000 mammographies annually. The purpose of this paper is preliminary evaluation of the mammography practice in Serbia, having in mind the annual number of examinations and fact that part of examination is performed on women without any clinical signs. For pilot implementation of Quality Control (QC) protocol in mammography, five hospitals with highest workload have been selected, representing the typical mammography practice in Serbia. Developed QC protocol, based on European guidelines for quality assurance in breast cancer screening and diagnosis, actual practice and resources, includes equipment testing and maintenance, staff training and QC management and allocation of responsibilities. Subsequently, it should be applied on the national scale. The survey demonstrated considerable variations in technical parameters that affect image quality and patients doses. Mean glandular doses ranged from 0.12 to 2.8 mGy, while reference optical density ranged from 1.2 to 2.8. Main problems were associated with film processing, viewing conditions and optical density control. The preliminary survey of mammography practice highlighted the need for optimization of radiation protection and training of operating staff, although the survey itself was very valuable learning process for all participants. Furthermore, systematic implementation of QC protocol should provide reliable performance of mammography units and maintain satisfactory image quality and keep patient doses as low as reasonably practical.(author)

  19. Performance Management in Portfolio School Districts. A Report from the Doing School Choice Right Project and the National Charter School Research Project

    Science.gov (United States)

    Lake, Robin J.; Hill, Paul T.

    2009-01-01

    The search continues for effective ways to educate disadvantaged children in big cities. Different cities have tried varied approaches--intensive work on the professional skills of teachers and administrators in Boston, standardized approaches to instruction in San Diego, and extensive use of vouchers and chartering in Washington, D.C., and…

  20. Mammography and radiation risk

    International Nuclear Information System (INIS)

    Breast cancer is the most frequent malignant neoplasia among women in Germany. The use of mammography as the most relevant diagnostic procedure has increased rapidly over the last decade. Radiation risks associated with mammography may be estimated from the results of numerous epidemiological studies providing risk coefficients for breast cancer in relation to age at exposure. Various calculations can be performed using the risk coefficients. For instance, a single mammography examination (bilateral, two views of each breast) of a women aged 45 may enhance the risk of developing breast cancer during her lifetime numerically from about 12% of 12.0036%. This increase in risk is lower by a factor of 3,300 as compared to the risk of developing breast cancer in the absence of radiation exposure. At the age of 40 or more, the benefit of mammography exceeds the radiation risk by a factor of about 100. At higher ages this factor increases further. Finally, the dualism of individual risk and collective risk is considered. It is shown that the individual risk of a patient, even after multiple mammography examinations, is vanishingly small. Nevertheless, the basic principle of minimising radiation exposure must be followed to keep the collective risk in the total population as low as reasonably achievable. (orig.)

  1. Practical digital mammography

    Energy Technology Data Exchange (ETDEWEB)

    Hashimoto, Beverly E. [Washington Univ., Seattle, WA (United States)]|[Virginia Mason Medical Center, VA (United States)

    2008-07-01

    This book is meant for the radiologist who is facing the challenge of organizing a digital mammographic imaging center. This text is meant to be a practical book that provides information about digital mammographic physics and equipment which will allow one to intelligently compare technologies and systems. Some of the major challenges include: large expense; rapidly changing technology, and inconsistent connectivity; and finally, need for strong information technology support. The initial conversion cost to digital mammographic imaging is relatively expensive due to the cost of digital mammography hardware, software, and storage. Virtually all other imaging modalities are being converted to purely digital storage and transfer, and the digital trend in mammography is inevitable. Technical advantages of digital mammography are described. However, the improved flexibility in image display and transfer are some of its strongest features. In conclusion, although there are increasing imaging modalities that may be used to evaluate breast disease, mammography will continue to play a key role in detecting breast cancer. To be an effective imager, the radiologist should become familiar with digital mammography and understand its role within the increasing complex structure of breast imaging techniques.

  2. Charter Schools and Market Segmentation

    Science.gov (United States)

    Batie, Michael

    2009-01-01

    This dissertation was undertaken to examine the effect(s) of charter school marketing on the Los Angeles Unified School District (LAUSD) education landscape with respect to the stratification of charter schools. Information from four sources: school websites, a survey of charter school parents, existing online statistics and data, and various…

  3. Quality assurance programme at Slovak mammography departments

    International Nuclear Information System (INIS)

    A co-ordinated research program (CRP) for optimisation of image quality in mammography in some Eastern European countries has been initiated by IAEA between 1999 and 2001 and the Slovak Republic took part in this program. The aim of this program was to implement the European QA/QC protocol in a sample of mammography departments and to achieve improvement of the image quality and patient dose reduction. On the national level 28 mammography units were chosen in accordance with equipment performance for quality control programme at this departments, for the first part of the mammography audit in the years 2002-2004. Realisation of CRP project contains: 1) Collection and evaluation of clinical images in agreement with EC criteria; 2) Evaluation of the image quality using mammography test phantom; 3) Measurements of the ESD at patients using TLD; 4) Intercomparison of TLD system calibration with IAEA laboratory; 5) Film reject analysis; 6) Implementation of QC program to the mammography units. The measurements of ESD on patients were performed with TLD (LiF 700 Harshaw). In the 6 month period were collected the results of measurements of: 1) object thickness compensation (measured weekly); 2) long time reproducibility (measured daily); 3) phantom image quality on the standard RMI 156 phantom (measured weekly); 4) ESD on phantom with TLD (once during the audit). Automatic Exposure Control compensation for the object thickness variation was measured by exposing different PMMA plates of thickness ranging from 20 to 60 mm, using the clinical settings. The long term reproducibility has been assessed from the measurements of the optical density and mAs product resulted from the exposure on the PMMA plates. In order to estimate the quality of the images the RMI 156 mammography accreditation phantom was chosen. The accreditation phantom contains test objects which simulate small structures seen in the breast (microcalcifications, fibrils, and tumor like masses). Results of

  4. Teaching atlas of mammography

    International Nuclear Information System (INIS)

    The illustrated case reports in this teaching atlas cover practically the entire range of possible pathological changes and are based on in-patient case material and 80,000 screening documents. The two basic approaches, - detection and analysis of changes -, are taught comprehensively and in great detail. A systematic procedure for analysing the mammographies, in order to detect even the very least changes, and its practical application is explained using mammographies showing unclear findings at first sight. A system of coordinates is presented which allows precise localisation of the changes. Exercises for practising the technique of identifying the pathological changes round up the methodolical chapters. Additional imaging technical enhancements and detail enlargements are of great help in interpreting the findings. The specific approach adopted for this teaching atlas is a 'reverse procedure', which leaves the beaten track and starts with analysing the mammographies and evaluating the radiographic findings, in order to finally derive the diagnosis. (orig./CB)

  5. Mammography - misunderstood and underutilized

    International Nuclear Information System (INIS)

    A mammography screening program for breast cancer carried out in Sacramento by the University of California Davis School of Medicine, Davis, was canceled because of negative public reaction to sensationalized reports in the lay press on the potential carcinogenic risks of the radiation exposure, along with passivity on the part of the medical community in defending the procedure and the program. Disappointment in this occurrence spurred us to explore physician's knowledge of and attitudes toward breast cancer and mammography. The results confirmed our suspicions that a significant number of physicians lack accurate knowledge of breast cancer and of the extremely high benefit-to-risk ratio of mammography as a means of early detection

  6. Controversies in Screening Mammography.

    Science.gov (United States)

    Swain, Monique; Jeudy, Myrlene; Pearlman, Mark D

    2016-06-01

    The utility and effectiveness of screening mammography in diagnosing breast cancer at earlier stages and reducing disease-specific mortality remain controversial especially as to when to start and stop routine mammographic screening, and whether mammograms should be performed annually or biennially in average-risk women. This manuscript will analyze the available moderate and high-quality data to analyze both the benefits (lives saved and life-years saved) and inconveniences/harms (additional views, extra biopsies/overdiagnosis, and overtreatment of ductal carcinoma in situ) of different mammography screening guidelines to assist the practitioner in counseling their patients in clinical practice. PMID:27101240

  7. CJS debate: Is mammography useful in average-risk screening for breast cancer?

    Science.gov (United States)

    Brackstone, Muriel; Latosinsky, Steven; Saettler, Elizabeth; George, Ralph

    2016-01-01

    Summary Given the recent debate over breast cancer screening that was reignited by the 25-year follow-up data from the Canadian National Breast Screening Study, the Canadian Journal of Surgery commissioned a group of Canadian experts to debate the value of screening mammography. We discuss the Canadian study and summarize the arguments in favour of and against screening mammography for average-risk patients. We also provide summary recommendations for the use of mammography. PMID:26574707

  8. Mammography screening in denmark

    DEFF Research Database (Denmark)

    Vejborg, Ilse Merete Munk; Mikkelsen, Ellen Margrethe; Garne, Jens Peter;

    2011-01-01

    Mammography screening is offered healthy women, and a high standard on professional and organizational level is mandatory not only in the screening programme but even in the diagnostic work-up and treatment. The main goal is to achieve a substantial reduction in disease specific mortality...

  9. Mammography screening in Denmark

    DEFF Research Database (Denmark)

    Vejborg, Ilse; Mikkelsen, Ellen Margrethe; Garne, Jens Peter;

    2011-01-01

    Mammography screening is offered healthy women, and a high standard on professional and organizational level is mandatory not only in the screening programme but even in the diagnostic work-up and treatment. The main goal is to achieve a substantial reduction in disease specific mortality...

  10. Mammography: What You Need to Know

    Science.gov (United States)

    ... Products For Consumers Home For Consumers Consumer Updates Mammography: What You Need to Know Share Tweet Linkedin ... Lerner, FDA medical officer in the Division of Mammography Quality Standards, discusses the importance of mammography and ...

  11. Positron emission mammography imaging

    Energy Technology Data Exchange (ETDEWEB)

    Moses, William W.

    2003-10-02

    This paper examines current trends in Positron Emission Mammography (PEM) instrumentation and the performance tradeoffs inherent in them. The most common geometry is a pair of parallel planes of detector modules. They subtend a larger solid angle around the breast than conventional PET cameras, and so have both higher efficiency and lower cost. Extensions to this geometry include encircling the breast, measuring the depth of interaction (DOI), and dual-modality imaging (PEM and x-ray mammography, as well as PEM and x-ray guided biopsy). The ultimate utility of PEM may not be decided by instrument performance, but by biological and medical factors, such as the patient to patient variation in radiotracer uptake or the as yet undetermined role of PEM in breast cancer diagnosis and treatment.

  12. Mammography accreditation program

    Energy Technology Data Exchange (ETDEWEB)

    Wilcox, P.

    1993-12-31

    In the mid-1980`s, the movement toward the use of dedicated mammography equipment provided significant improvement in breast cancer detection. However, several studies demonstrated that this change was not sufficient to ensure optimal image quality at a low radiation dose. In particular, the 1985 Nationwide Evaluation of X-ray Trends identified the wide variations in image quality and radiation dose, even from dedicated units. During this time period, the American Cancer Society (ACS) launched its Breast Cancer Awareness Screening Campaign. However, there were concerns about the ability of radiology to respond to the increased demand for optimal screening examinations that would result from the ACS program. To respond to these concerns, the ACS and the American College of Radiology (ACR) established a joint committee on mammography screening in 1986. After much discussion, it was decided to use the ACR Diagnostic Practice Accreditation Program as a model for the development of a mammography accreditation program. However, some constraints were required in order to make the program meet the needs of the ACS. This voluntary, peer review program had to be timely and cost effective. It was determined that the best way to address these needs would be to conduct the program by mail. Finally, by placing emphasis on the educational nature of the program, it would provide an even greater opportunity for improving mammographic quality. The result of this effort was that, almost six years ago, in May 1987, the pilot study for the ACR Mammography Accreditation Program (MAP) began, and in August of that year, the first applications were received. In November 1987, the first 3-year accreditation certificates were awarded.

  13. Mammography accreditation program

    International Nuclear Information System (INIS)

    In the mid-1980's, the movement toward the use of dedicated mammography equipment provided significant improvement in breast cancer detection. However, several studies demonstrated that this change was not sufficient to ensure optimal image quality at a low radiation dose. In particular, the 1985 Nationwide Evaluation of X-ray Trends identified the wide variations in image quality and radiation dose, even from dedicated units. During this time period, the American Cancer Society (ACS) launched its Breast Cancer Awareness Screening Campaign. However, there were concerns about the ability of radiology to respond to the increased demand for optimal screening examinations that would result from the ACS program. To respond to these concerns, the ACS and the American College of Radiology (ACR) established a joint committee on mammography screening in 1986. After much discussion, it was decided to use the ACR Diagnostic Practice Accreditation Program as a model for the development of a mammography accreditation program. However, some constraints were required in order to make the program meet the needs of the ACS. This voluntary, peer review program had to be timely and cost effective. It was determined that the best way to address these needs would be to conduct the program by mail. Finally, by placing emphasis on the educational nature of the program, it would provide an even greater opportunity for improving mammographic quality. The result of this effort was that, almost six years ago, in May 1987, the pilot study for the ACR Mammography Accreditation Program (MAP) began, and in August of that year, the first applications were received. In November 1987, the first 3-year accreditation certificates were awarded

  14. Does Distance Matter? Distance to Mammography Facilities and Stage at Diagnosis of Breast Cancer in Kentucky

    Science.gov (United States)

    Huang, Bin; Dignan, Mark; Han, Daikwon; Johnson, Owen

    2009-01-01

    Background: National and regional data indicate that breast cancer early detection is low in Kentucky, especially rural regions, perhaps because access to mammography services can be problematic. Objective: This study examined the distance between residences of women diagnosed with breast cancer and the nearest mammography facility, as a risk…

  15. Quality assurance programme for screen film mammography

    International Nuclear Information System (INIS)

    The application of radiation in human health, for both the diagnosis and treatment of disease, is an important component of the work of the IAEA. In the area of diagnostic radiology, this work is focused on quality assurance methods to both the promotion of the effective use of radiation for diagnostic outcome, through achieving and maintaining appropriate image quality, and also on dose determination to allow the monitoring and reduction of dose to the patient. In response to heightened awareness of the importance of patient dose contributed by radiology procedures, the IAEA published Dosimetry in Diagnostic Radiology: An International Code of Practice (Technical Reports Series No. 457) in 2007, to form a basis for patient dose determination for the Member States. Further to this, it is recognized that for complex diagnostic procedures, such as mammography, a detailed guidance document is required to give the professionals in the clinical centre the knowledge necessary to assess the patient dose, as well as to ensure that the procedure gives the maximal patient benefit possible. It is well documented that without the implementation of a quality culture and a systematic quality assurance programme with appropriate education, the detection of breast cancer cannot be made at an early enough stage to allow effective curative treatment to be undertaken. Currently there are a number of established quality assurance protocols in mammography from national and regional institutions, however, many of these protocols are distinctive and so a harmonized approach is required. This will allow the Member States to facilitate quality assurance in mammography in a standardized way which will also facilitate the introduction of national quality assurance programmes that are needed to underpin effective population screening programmes for breast cancer. Development of a quality assurance document for screen film mammography was started in 2005 with the appointment of a drafting

  16. Dangers Facing the Earth Charter

    Science.gov (United States)

    Ruiz, Javier Reyes

    2010-01-01

    The article explores social and educational processes that could undermine the Earth Charter's promise. It points out that the meaning of the Charter would be affected if it is used in a doctrinaire manner, if individuals or groups assume the role of its legitimate and expert emissaries, if it takes on a messianic tone in its central ideas, if it…

  17. Boot Camps for Charter Boards

    Science.gov (United States)

    Kronholz, June

    2015-01-01

    This article addresses the question of who owns the responsibility when a charter school gets into trouble--when its students aren't learning, or it misses its enrollment targets, or money runs short, or it closes. Upon presenting this question to a director of a charter school, a board member, and a Massachusetts-based education consultant and…

  18. Charter Schooling and Democratic Justice

    Science.gov (United States)

    Abowitz, Kathleen Knight; Karaba, Robert

    2010-01-01

    As the mixed achievements of charter schools come under more intense political inspection, the conceptual underpinnings of current charter school reform remain largely unexamined. This article focuses on one moral-political concept centrally related to school reform and policy, the concept of justice. Using examples from the state of Ohio, the…

  19. Charter School Replication. Policy Guide

    Science.gov (United States)

    Rhim, Lauren Morando

    2009-01-01

    "Replication" is the practice of a single charter school board or management organization opening several more schools that are each based on the same school model. The most rapid strategy to increase the number of new high-quality charter schools available to children is to encourage the replication of existing quality schools. This policy guide…

  20. 76 FR 64122 - NASA Advisory Committee; Renewal of NASA's International Space Station Advisory Committee Charter

    Science.gov (United States)

    2011-10-17

    ... SPACE ADMINISTRATION NASA Advisory Committee; Renewal of NASA's International Space Station Advisory Committee Charter AGENCY: National Aeronautics and Space Administration (NASA). ACTION: Notice of renewal... imposed on NASA by law. The renewed Charter is for a one-year period ending September 30, 2012. It...

  1. From Policy to Practice: Implementation of the Legislative Objectives of Charter Schools

    Science.gov (United States)

    Barghaus, Katherine M.; Boe, Erling E.

    2011-01-01

    Key legislative objectives of charter schools are to provide more school and classroom options, increase teacher influence over decision making, and increase school autonomy from state and district policy. Using national data from the 2003-4 School and Staffing Survey, we found that charter schools attained these legislative objectives when…

  2. MR mammography (MRM)

    International Nuclear Information System (INIS)

    The book deals with MRI for the diagnostic evaluation of malignant breast lesions. A survey of methods available for breast examination, magnetic resonance mammography (MRM) is briefly explained in terms of development and technical problems encountered in the various examinations. The clinical aspects from a central part of the book, giving information relating to the various neoplasms and a comprehensive review of cases. The book concludes with a chapter discussing the interpretation of data and images, presenting examples of normal findings and of manifestations of carcinoma, fibroadenoma, cysts, mastopathies, scars due to plastic surgery, and the lactating breast. (UWA). 648 figs., 25 tabs

  3. Mammography screening in Denmark

    DEFF Research Database (Denmark)

    Vejborg, Ilse; Mikkelsen, Ellen Margrethe; Garne, Jens Peter;

    2011-01-01

    Mammography screening is offered healthy women, and a high standard on professional and organizational level is mandatory not only in the screening programme but even in the diagnostic work-up and treatment. The main goal is to achieve a substantial reduction in disease specific mortality, but it...... is not possible to evaluate the effect on mortality until several years later, and continuously monitoring of the quality of all aspects of a screening programme is necessary. Based on other European guidelines, 11 quality indicators have been defined, and guidelines concerning organizational...... requirements for a Danish screening programme as well as recommendations for the radiographic and radiological work have been drawn up....

  4. Direct digital mammography image acquisition

    International Nuclear Information System (INIS)

    Mammography is a branch of radiology which could benefit greatly from the assimilation of digital imaging technologies. Computerized enhancement techniques could be used to ensure optimum presentation of all clinical images. Beyond this it will facilitate powerful new clinical resources such as computer-assisted diagnosis, tele-mammography, plus digital image management and archiving. An essential precursor to all these advances is the availability of appropriate direct digital mammography (DDM) image-acquisition system(s) to capture high-quality breast X-ray image data at the outset. The only practical DDM image-acquisition system currently available is (photo-stimulable phosphor) computed radiography. Modern computed mammography (CM) uses similar radiation doses to the patient and produces equivalent, albeit different, image quality to screen-film mammography. Computed mammography offers superior rendition of the skin edge and sub-cutaneous tissue and dense parenchyma, while ensuring equivalent micro-calcification detectability. Meanwhile, a variety of new technical approaches to DDM are under active investigation and/or development which promise to supercede film-based mammography. These new (second generation) DDM technologies promise the radiologist superior image quality combined with significant dose savings compared with contemporary imaging systems. In this review we describe and compare the physical and clinical characteristics of CM and the various emerging DDM image-acquisition technologies. (orig.). With 7 figs., 1 tab

  5. Patient's rights charter in Iran.

    Directory of Open Access Journals (Sweden)

    Alireza Parsapoor

    2014-01-01

    Full Text Available Given the importance of patient's rights in healthcare, special attention has been given to the concept of patient's rights by the Ministry of Health and Medical Education in Iran. Iranian patient's rights charter has been compiled with a novel and comprehensive approach. This charter aims to elucidate rights of recipients of health services as well as observing ethical standards in medicine. This paper presents the Iranian patient's rights charter. Based on a study done from 2007 to 2009, the charter has been finalized through an extensive consultation involving all stakeholders, patients, physicians, nurses, lawyers, patient associations and health policy makers. The developed charter was adopted by the Ministry of Health in December 2009. Iranian patient's rights charter has been formulated in the framework of 5 chapters and 37 articles including vision and an explanatory note. The five chapters concern right to receiving appropriate services, right to access desired and enough information, right to choose and decide freely about receiving healthcare, right to privacy and confidentiality, and finally right to access an efficient system of dealing with complaints which have been explained in 14, 9, 7, 4 and 3 articles, respectively.  The paper concludes that, adopting the patient's rights charter is a valuable measure to meet patient's rights; however, a serious challenge is how to implement and acculturate observing patient's rights in practice in our healthcare system in Iran.

  6. Digital mammography and their developments

    International Nuclear Information System (INIS)

    At the present time digital mammography is a satisfactory breast diagnostic imaging in clinical as well as screening mammography in defined age groups. Nevertheless it shows beside the application of ionizing radiation in women with dense breasts limitations in the detection of non calcification breast cancers. Tomosynthesis, digital contrast-enhanced mammography and breast-CT with or without contrast media lead to better results. Especially the application of contrast media for the visualisation of the tumor angiogenesis is invariably superior to all other non-contrast imaging modalities. However, the excellent results of breast MRI will be probably accessible with none of the new procedures.

  7. Pain and discomfort during mammography

    DEFF Research Database (Denmark)

    Aro, A R; Absetz-Ylöstalo, P; Eerola, T;

    1996-01-01

    The aim of this prospective study was to investigate associations of mammography pain and discomfort with sociodemographics, personal history and psychological and situational factors. Subjects were women with a negative screening finding (n = 883) from a random sample of 50-year-old Finnish women...... was the most powerful factor explaining pain and discomfort among women with earlier mammography. However, it had no effect among women without earlier mammography, for whom screening-related nervousness and perceptions of staff were crucial. Suggested interventions include better information before screening...

  8. Analyzing factors associated with women's attitudes and behaviors toward screening mammography using design-based logistic regression.

    Science.gov (United States)

    Madadi, Mahboubeh; Zhang, Shengfan; Yeary, Karen H Kim; Henderson, Louise M

    2014-02-01

    We examined the factors associated with screening mammography adherence behaviors and influencing factors on women's attitudes toward mammography in non-adherent women. Design-based logistic regression models were developed to characterize the influencing factors, including socio-demographic, health related, behavioral characteristics, and knowledge of breast cancer/mammography, on women's compliance with and attitudes toward mammography using the 2003 Health Information National Trends Survey data. Findings indicate significant associations among adherence to mammography and marital status, income, health coverage, being advised by a doctor to have a mammogram, having had Pap smear before, perception of chance of getting breast cancer, and knowledge of mammography (frequency of doing mammogram) in both women younger than 65 and women aged 65 and older. However, number of visits to a healthcare provider per year and lifetime number of smoked cigarettes are only significant for women younger than 65. Factors significantly associated with attitudes toward mammography in non-adherent women are age, being advised by a doctor to have a mammogram, and seeking cancer information. To enhance adherence to mammography programs, physicians need to continue to advise their patients to obtain mammograms. In addition, increasing women's knowledge about the frequency and starting age for screening mammography may improve women's adherence. Financially related factors such as income and insurance are also shown to be significant factors. Hence, healthcare policies aimed at providing breast cancer screening services to underserved women will likely enhance mammography participation. PMID:24510010

  9. Mobility Charters and Manifestos

    DEFF Research Database (Denmark)

    Jensen, Ole B.

    2010-01-01

    This paper explore a number of different cases of articulating notions of ‘correct’ mobility behavior and practice by looking into charters, manifestos and codes of mobility regulation. Within such discourses of ‘correct mobility’ more or less subtle expressions of power as well as normative and...... ethical positions on mobility prevail. Such ‘imagined correct mobility behavior’ are drawing on larger issues of societal change that need to be brought out in a critical analysis and discussion reflecting the attempts to control, design and orchestrate mobility patterns. The paper therefore argues within...... 2007, the English ‘Highway Code Booklets’ from the 1930’s, 40’s and 50’s, the ‘City Slow Charter’, the ‘New Urbanism Charter’ as attempts to codify and order mobility and mobile practices....

  10. Response costs of mammography adherence: Iranian women’s perceptions

    Science.gov (United States)

    Khodayarian, Mahsa; Mazloomi-Mahmoodabad, Seyed Saied; Lamyian, Minoor; Morowatisharifabad, Mohammad Ali; Tavangar, Hossein

    2016-01-01

    Background: Mammography as the most common secondary prevention method has known to be helpful in detecting breast cancer at the early stages. Low level of participation among women toward mammography uptake due to cultural beliefs is a great concern. This study aimed at exploring the perceptions of women about response costs of mammography adherence (MA) in Yazd, Iran. Methods: A qualitative study using semi-structured interviews was performed. Fourteen women,one oncology nurse, and a breast cancer survivor were purposefully interviewed. Interviews were transcribed verbatim and analyzed by directed content analysis method based on protection motivation theory (PMT). Results: One main theme was emerged from the analysis namely called "response costs".Two main categories were also emerged from the data; (1) psychological barriers with six subcategories including "embarrassment," "worry about being diagnosed with cancer," "preoccupation with underlying disease," "misconception about mammography," "need for an accompanying person," and "internalizing the experiences of the others," and (2) maladaptive coping modes which encompassed three subcategories: "religious faith," "fatalism," and"avoidance and denial." Conclusion: Useful information was provided about the response costs of mammography utilization based on the perceptions of women. Cognitive barriers may be decreased by conducting modifications in women’s awareness and attitude toward MA as well as changing the national health system infrastructures. Incorporating religious and cultural belief systems into MA educational programs through motivational messages is recommended. PMID:27386423

  11. Earth Charter and nuclear energy

    International Nuclear Information System (INIS)

    The chapter presents Earth Charter, where are listed the principles in 4 sections: 1) respect and take care of the life community; 2) environmental integrity; social and economic welfare; 4) democracy, no-violence and peace

  12. New Jersey Primer on Special Education & Charter Schools

    Science.gov (United States)

    New Jersey Department of Education, 2013

    2013-01-01

    This document has been developed by the New Jersey Department of Education with the assistance of the TA Customizer Project funded by the U.S. Department of Education Charter Schools Program (CSP) and conducted by the National Association of State Directors of Special Education (NASDSE). Its focus is on providing information and technical…

  13. 76 FR 65750 - Aerospace Safety Advisory Panel; Charter Renewal

    Science.gov (United States)

    2011-10-24

    ... SPACE ADMINISTRATION Aerospace Safety Advisory Panel; Charter Renewal AGENCY: National Aeronautics and... Aerospace Safety Advisory Panel. SUMMARY: Pursuant to sections 14(b)(1) and 9(c) of the Federal Advisory... of the NASA Aerospace Safety Advisory Panel is in the public interest in connection with...

  14. Students with Disabilities in Charter Schools: What We Now Know

    Science.gov (United States)

    Rhim, Lauren Morando; McLaughlin, Margaret

    2007-01-01

    This article provides an overview of the charter school movement in the United States and a synthesis of the findings of the studies that have been conducted for nearly a decade by the University of Maryland in collaboration with the National Association of State Directors of Special Education (NASDSE). The research documents the evolution of…

  15. Nuclear Safety Charter

    International Nuclear Information System (INIS)

    The AREVA 'Values Charter' reaffirmed the priority that must be given to the requirement for a very high level of safety, which applies in particular to the nuclear field. The purpose of this Nuclear Safety Charter is to set forth the group's commitments in the field of nuclear safety and radiation protection so as to ensure that this requirement is met throughout the life cycle of the facilities. It should enable each of us, in carrying out our duties, to commit to this requirement personally, for the company, and for all stakeholders. These commitments are anchored in organizational and action principles and in complete transparency. They build on a safety culture shared by all personnel and maintained by periodic refresher training. They are implemented through Safety, Health, and Environmental management systems. The purpose of these commitments, beyond strict compliance with the laws and regulations in force in countries in which we operate as a group, is to foster a continuous improvement initiative aimed at continually enhancing our overall performance as a group. Content: 1 - Organization: responsibility of the group's executive management and subsidiaries, prime responsibility of the operator, a system of clearly defined responsibilities that draws on skilled support and on independent control of operating personnel, the general inspectorate: a shared expertise and an independent control of the operating organization, an organization that can be adapted for emergency management. 2 - Action principles: nuclear safety applies to every stage in the plant life cycle, lessons learned are analyzed and capitalized through the continuous improvement initiative, analyzing risks in advance is the basis of Areva's safety culture, employees are empowered to improve nuclear Safety, the group is committed to a voluntary radiation protection initiative And a sustained effort in reducing waste and effluent from facility Operations, employees and subcontractors are treated

  16. Visualization of mocrocalcifications on mammographies obtained by digital fullfield mammography in comparison to conventional film-screen mammography

    International Nuclear Information System (INIS)

    Purpose: To evaluate the visualization of microcalcifications on mammographies obtained by full-field digital mammography (FFDM) in comparison to conventional film-screen mammography (FSM). Material and Methods: Forty-seven digital and film-screen mammographies depicting histologically proven lesions (27 benign, 20 malignant) were assessed by 4 readers. The images obtained with the different systems were comparable in terms of positioning. Maximum time interval between film-screen mammography and digital mammography was three months. Using a questionnaire, the readers evaluated the number of microcalcifications and their subjective conspicuity for FFDM (Senographe 2000D, GE Medical Systems, Milwaukee, USA) and FSM. A 7-point scale based on the BIRADS classification was used to characterize the calcifications by means of ROC analysis. Results: No statistically significant differences were seen between the two types of mammography among the readers in assessing the number of microcalcifications. The subjective conspicuity of microcalcifications was found to be significantly better for digital mammographies. The diagnosis assigned by the readers did not show significant differences between the two systems. Conclusion: Although the subjective conspicuity of microcalcifications was found to be significantly better on digital mammography compared to film-screen mammography, there was no significant advantage of digital mammography resulting from the higher contrast resolution nor a disadvantage in terms of characterization of microcalcifications resulting from the lower spacial resolution. The advantages of digital mammography (e.g. CAD-systems, archiving, dose reduction) can be used without a loss of diagnostic quality. (orig.)

  17. Overdiagnosis in screening mammography in Denmark

    DEFF Research Database (Denmark)

    Njor, Sisse Helle; Olsen, Anne Helene; Blichert-Toft, Mogens;

    2013-01-01

    To use data from two longstanding, population based screening programmes to study overdiagnosis in screening mammography.......To use data from two longstanding, population based screening programmes to study overdiagnosis in screening mammography....

  18. Results of radiation protection programmes on mammography

    International Nuclear Information System (INIS)

    In this paper, we present the results of mammography quality control tests related to the work with Portuguese mammography equipment, either in conventional or in digital mammography computed radiography, showing the main differences in the tested equipments. Quality control in mammography is a very special area of quality control in radiology, which demands relatively high knowledge on physics. Digital imaging is changing the standards of the radiographic imaging. Regarding mammography, this is yet a controversial issue owing to some limitations of the digital detectors, like the resolution for instance. A complete set of results regarding radiation protection of the patients submitted to mammography diagnosis is presented. A discussion of the quality image parameters and its interpretation in conventional and digital mammography is presented. In conclusion, we present a sample of results that can be considered as characteristics of mammography equipment in Portugal. (authors)

  19. FastStats: Mammography/Breast Cancer

    Science.gov (United States)

    ... this? Submit What's this? Submit Button NCHS Home Mammography and Breast Cancer Recommend on Facebook Tweet Share Compartir Data are for the U.S. Mammography use Percent of women 40 years of age ...

  20. Health insurance and household income associated with mammography utilization among American women, 2000-2008

    Institute of Scientific and Technical Information of China (English)

    ZHAO Da-hai; ZHANG Zhi-ruo; RAO Ke-qin

    2011-01-01

    Background National Breast and Cervical Cancer Early Detection Program (NBCCEDP) has provided free or low-costmammograms to low-income or no health insurance women in all of the states of the United States (US) since 1997.The objective of this study was to understand whether health insurance and annual household income impacted the mammography utilization since the implementation of NBCCEDP,in order to evaluate how the implementation of NBCCEDP impacted mammography utilization among American women.Methods Data were from the database of Behavioral Risk Factor Surveillance System (BRFSS) of the CDC in US.Mammography utilization was measured by whether the American woman aged 40 to 64 years had the mammography within the last two years.The chi square test and multivariate Logistic regression were used to evaluate the associations between mammography utilization and health insurance,annual household income,and other factors for any given year.Results From 2000 to 2008,the rate of mammography utilization among participants had a steady decrease on the whole from 86.7% to 83.8%.The results showed that the mammography utilization correlated significantly with health insurance and annual household income for any given year.The results also showed that compared with participants who were uninsured,those who were insured had a greater times higher rate of mammography in 2008 than any other year from 2000 to 2008,and compared with participants whose annual household income was below $15 000,those whose annual household income was above $50 000 had a greater times higher rate of mammography in 2008 than in 2004 and 2006.Conclusions Health insurance and annual household income impacted the mammography utilization for any given year from 2000 to 2008,and the implementation of NBCCEDP has not achieved its original goal on breast cancer screening.

  1. Leading Charters: How Charter School Administrators Define Their Roles and Their Ability to Lead

    Science.gov (United States)

    Carpenter, Dick Michael, II; Peak, Charity

    2013-01-01

    Charter schools have been studied from numerous perspectives. One topic that remains under-researched, however, is charter school leadership. Therefore, we examine how charter administrators define their leadership roles and their ability to lead. Results indicate that charter principals see three primary functions in their leadership--building…

  2. 77 FR 44475 - Final Definitions, Requirements, and Selection Criteria; Charter Schools Program (CSP)-Charter...

    Science.gov (United States)

    2012-07-30

    ... incentives for high-quality charter schools to collaborate with non-chartered public schools and non... typically provided for traditional public schools. The purpose of the Collaboration Awards competition (CFDA...-chartered public schools (as defined in this notice) and non-chartered LEAs (as defined in this notice)...

  3. Protecting Geoheritage - Geodiversity Charter for England

    Science.gov (United States)

    Dunlop, Lesley

    2016-04-01

    The Geodiversity Charter for England, launched in 2014, sets out the clear vision that England's 'geodiversity is recognised as an integral and vital part of our environment, economy and heritage that must be safeguarded and managed for current and future generations'. England is privileged to be among the most geodiverse places in the world with 700 million years of geological history revealed by our rocks. The white cliffs of Dover, honey coloured Cotswold limestone, granite Dartmoor Tors, are examples of this geodiversity. To maintain and enhance our geodiversity it is important to recognise its role in: • the understanding of England's geological history and global geosciences • natural heritage, both terrestrial and marine, and landscapes in all their diversity • supporting habitats and species and the many essential benefits they provide for society • adaptation to changes in climate and sea-level through sustainable management of land and water and working with natural processes • sustainable economic development • the history, character and cultural development of our society through intellectual growth and creative expression alongside industrial and technological development • public health, quality of life and national well-being and connecting people with the natural environment including active promotion of geotourism. Geodiversity, however, is an often overlooked environmental asset. The vision of the Charter and the work of the English Geodiversity Forum is to encourage good practice and to act as a focus in order to: • raise awareness of the importance, value and relevance of geodiversity to our economic prosperity and comfort and its wider links with the natural environment, landscape, cultural and historical heritage and sense of place • encourage a sense of pride through education and learning, promotion and interpretation • promote careful management of geodiversity through conservation and enhancement of its special

  4. FDA & digital mammography: why has FDA required full field digital mammography systems to be regulated as potentially dangerous devices for more than 10 years?

    Science.gov (United States)

    Nields, Morgan W

    2010-05-01

    Digital mammography is routinely used in the US to screen asymptomatic women for breast cancer and currently over 50% of US screening centers employ the technology. In spite of FDAs knowledge that digital mammography requires less radiation than film mammography and that its equivalence has been proven in a prospective randomized trial, the agency has failed to allow the technology market access via the 510(k) pre market clearance pathway. As a result of the restrictive Pre Market Approval process, only four suppliers have received FDA approval. The resulting lack of a competitive market has kept costs high, restricted technological innovation, and impeded product improvements as a result of PMA requirements. Meanwhile, at least twelve companies are on the market in the EU and the resulting competitive market has lowered costs and provided increased technological choice. A cultural change with new leadership occurred in the early 90's at FDA. The historical culture at the Center for Devices and Radiological Health of collaboration and education gave way to one characterized by a lack of reliance on outside scientific expertise, tolerance of decision making by unqualified reviewers, and an emphasis on enforcement and punishment. Digital mammography fell victim to this cultural change and as a result major innovations like breast CT and computer aided detection technologies are also withheld from the market. The medical device law, currently under review by the Institute of Medicine, should be amended by the Congress so that new technologies can be appropriately classified in accordance with the risk based assessment classification system detailed in Chapter V of the Federal Food, Drug, and Cosmetic Act. A panel of scientific experts chartered by the NIH or IOM should determine the classification appropriate for new technologies that have no historical regulatory framework. This would be binding on FDA. Unless the law is changed we will likely again experience

  5. The International Charter and Flood Mapping

    OpenAIRE

    Shan, Jie

    2009-01-01

    An overview of recent Purdue activities related to the International Charter for Space and Major Disasters, including general information about The Charter, 3 Indiana flood examples, and a summary of the lessons learned therefrom.

  6. Implementation of QA into daily practice of the mammography departments in Slovakia

    International Nuclear Information System (INIS)

    Because of the widespread use of mammography the implementation of optimization of image quality has been initiated in Slovakia. On the basis of EC Directive 97/43 the new Slovak legislation improved the national system of acceptability of radiological examinations by implementation of guidance levels, system of education and necessity of introduction of quality assurance (QA) and quality control (QC) programmes in radiological departments. For the achievement of the good practice, experienced staff and close collaboration between radiologist, medical physicist and radiographers are required. For this reason the IAEA established during 1999 to 2001 a coordinated research programme (CRP) for optimization of image quality in mammography in some Eastern European countries. Our institute took part in this CRP with the aim to implement the European QA/QC protocol in a sample of mammography departments and to achieve improvement of the image quality and patient dose reduction. In our contribution the results and experiences of a national mammography audit are presented. On the national level 42 mammography units were chosen in accordance with equipment performance for quality control programme at these departments, for two parts of the mammography audit in the years 2002-2005. The obtained results indicate that the pilot mammography audit in Slovakia is a very important tool for correcting actions at the involved departments. In the six month period, results of measurements were collected of: 1. object thickness compensation (measured weekly) 2. long time reproducibility (measured daily) 3. phantom image quality on the standard RMI 156 phantom (measured weekly) 4. ESD on phantom with TLD (once during the audit). For the evaluation of the quality of clinical images each mammography department lent four images of ten patients (2 CC and 2 MLO). These images were evaluated by a group of independent experts nominated by the Slovak Health Ministry. The results of the pilot

  7. Are Charter School Unions Worth the Bargain?

    Science.gov (United States)

    Price, Mitch

    2011-01-01

    About 12 percent of all charter schools have bargaining agreements. Why do charter schools unionize? What is in these charter school contracts? Can they be considered innovative or models for union reform? And how do they compare to traditional district/union teacher contracts? Center on Reinventing Public Education legal analyst Mitch Price…

  8. New Hampshire Charter Schools Parent Study 2011

    Science.gov (United States)

    Julius, Tom

    2011-01-01

    This study was conducted in Spring 2011 with the purpose of better understanding the nature and experiences of New Hampshire charter school parents. Nine out of ten operating NH charter schools participated. Parents were invited to participate in an on-line survey and on-site focus group interviews. Results provide a profile of NH charter school…

  9. 34 CFR 300.7 - Charter school.

    Science.gov (United States)

    2010-07-01

    ... 34 Education 2 2010-07-01 2010-07-01 false Charter school. 300.7 Section 300.7 Education Regulations of the Offices of the Department of Education (Continued) OFFICE OF SPECIAL EDUCATION AND... DISABILITIES General Definitions Used in This Part § 300.7 Charter school. Charter school has the meaning...

  10. Is Racial Segregation Changing in Charter Schools?

    Science.gov (United States)

    Lee, Jin; Lubienski, Christopher

    2011-01-01

    Charter schools embody the theoretical potential to promote integration since they can draw students from across district boundaries that often reflect segregated residential patterns. While a number of studies have examined overall racial composition of charter schools, virtually no attention has been paid to how charter school enrollment…

  11. New Mexico Charter Schools Annual Report

    Science.gov (United States)

    New Mexico Public Education Department, 2013

    2013-01-01

    In 2011, the New Mexico legislature passed changes to the Charter School Act that provided more accountability for both charters and authorizers in New Mexico. As part of that law, the Public Education Department (PED) is asked to submit an annual report on the status of charter schools in New Mexico. This is the first report submitted under that…

  12. Radiation risk in mammography examinations

    International Nuclear Information System (INIS)

    The application of X rays in mammography examinations requires not only constant control of physical and technical parameters of the equipment used, but also an evaluation of the radiation risk for patients, particularly in mammography screening programmes. There are a number of methods of dose evaluation in mammography. Some of them are included in the dosimetry protocols. The tolerances for measured values, limiting the dose to the patients have also been established. One of the methods, proposed by Dance, applies to establishing the doses to individual patients. It requires the knowledge of clinical and exposure parameters. Another method, recommended by the EC, requires establishing the phantom dose for reference exposure, as part of quality control tests. This approach is simpler but less precise, because at most mammography facilities, the conditions of reference exposure are different than those of routine clinical exposure, as was shown in an exercise of quality control tests in a group of 32 mammography facilities in Poland. The method proposed in this study is an intermediate solution recommending measurement of the phantom dose for routine clinical exposure. The report contains the data of 230 exposures performed at six mammography facilities in Poland. These data were used to establish an individual dose for every patient undergoing mammography examination according to the method proposed by Dance. For each mammography facility, the mean glandular dose (MGDF) was established for reference and routine exposures according to the EC Dosimetry Protocol. The limits for phantom dose were established, which, according to the EC protocol, depend on the optical density (over background) of the image of the PMMA phantom 4.5 cm thick. The phantom doses determined for each mammography facility were below the limits. The lowest value of the mean dose received by patients in six facilities was 1.05 mGy, and the highest 3.03 mGy. The differences between these values

  13. Comparison of written reports of mammography, sonography and magnetic resonance mammography for preoperative evaluation of breast lesions, with special emphasis on magnetic resonance mammography

    OpenAIRE

    Malur, Sabine; Wurdinger, Susanne; Moritz, Andreas; Michels, Wolfgang; Schneider, Achim

    2000-01-01

    Patients with abnormal breast findings (n = 413) were examined by mammography, sonography and magnetic resonance (MR) mammography; 185 invasive cancers, 38 carcinoma in situ and 254 benign tumours were confirmed histologically. Sensitivity for mammography was 83.7%, for sonography it was 89.1% and for MR mammography it was 94.6% for invasive cancers. In 42 patients with multifocal invasive cancers, multifocality had been detected by mammography and sonography in 26.2%, and by MR mammography i...

  14. Patients Mammographic Dose Survey in a Sample of Slovak Mammography Departments

    International Nuclear Information System (INIS)

    Breast cancer is the most frequent cancer and the most frequent cause of cancer induced deaths in Europe. Demographic trends indicate a continuing increase in this substantial public health problem. Systematic early detection, effective diagnostic pathways and high quality services have the ability for lowering the breast cancer mortality rates and for reducing the burden of this disease in the population The widespread use of mammography for early breast cancer detection is highly accepted all over the world. For achievement of a successful national mammography programme in Slovakia, a national QA/QC mammography system was introduced. Coming from alarming values of increase of malignant neoplasm of breast in Slovakia a national mammography audit has been initiated, performed in three runs and working in three phases: assessment of existing status of practice and equipment performance, as well as education and training of radiologists and radiographers of 42 mammography departments; implementation of technical quality programme and patient dose evaluation; clinical image evaluation. Preventive mammography in spite of being a reasonable examination, which represents health benefit for patient, exceed also the health risk. In 1991-1996 mammographic examination created 1.3% from all medical radiodiagnostic expositions made in Slovakia. In 2005 there were realized 241 208 mammographic examinations, 140 798 of them were noticed like preventive examinations. In 2006 the number of all mammographic examinations in Slovakia increased to 271 755 and of them 156 199 were preventive mammographic examinations. In our presentation we tried to establish the average absorbed glandular doses of patients undergoing mammography examinations in 10 selected departments and to compare the obtained results with European diagnostic reference values. The obtained values were used for the proposal of a new national diagnostic reference value for mammography examinations

  15. Perspectives of the digital mammography platform

    International Nuclear Information System (INIS)

    In Europe one out of every nine women suffers from breast cancer during her lifetime. Since the introduction of mammography screening programs more breast cancers are being diagnosed when they are still small and early stage cancers with a favourable prognosis. The introduction of digital mammography systems has led to a continuous reduction of breast cancer mortality especially in specific patient subgroups. Furthermore, the digital mammography platform enables the development of new, innovative breast imaging methods to increase sensitivity and decrease breast cancer mortality. This digital mammography platform includes digital breast tomosynthesis, digital contrast medium mammography and digital contrast medium breast tomosynthesis as well as fused data sets from digital mammography with ultrasound or MRI. The following article summarizes these new applications, describes the strengths of the digital platform and illustrates the potential advantages of an improved breast cancer diagnosis by digital mammography. (orig.)

  16. Mammography in women under 35

    International Nuclear Information System (INIS)

    The detection of breast cancer in women under 35 is quite an uncommon event, accounting only for 3.2-3.4% of all breast cancers. To determine the indications for mammography in women under 35, the authors correlated clinical, mammographic, and US findings with fine-needle aspiration/surgical biopsy and follow-up results in 1040 symptomatic women examined at the Center of Senology of the Istitute of Radiology - University of Perugia, Italy, from 1984 to June 1990. Of 1040 women, 482 (41.6%) had normal findings; benign disease was diagnosed in 558 (53.7%) cases, and malignant disease in 49 (4.7%). Mammography was very useful to diagnose malignancy in palpable breast lesions, as well as to suggest the need for biopsy, to detect metachronous cancer and to define lesion sizes. In inflammatory process - e.g., mastitis and abscesses - both mammography and US were capable as its remission after therapy. Galactography had a specific role in the evaluation of the mammary duct and demonstrated intraductal pathologic conditions. In the authors'experiences, mammography never showed occult breast cancers in women with no palpable breast lesions or hematic nipple discharge

  17. Is Short-Interval Mammography Necessary After Breast Conservation Surgery and Radiation Treatment in Breast Cancer Patients?

    International Nuclear Information System (INIS)

    Purpose: The optimum timing and frequency of mammography in breast cancer patients after breast-conserving therapy (BCT) are controversial. The American Society of Clinical Oncology recommends the first posttreatment mammogram 1 year after diagnosis but no earlier than 6 months after completion of radiotherapy. The National Comprehensive Cancer Network recommends annual mammography. Intermountain Healthcare currently follows a more frequent mammography schedule during the first 2 years in BCT patients. This retrospective study was undertaken to determine the cancer yield mammography during the first 2 years after BCT. Methods and Materials: 1,435 patients received BCT at Intermountain Healthcare between 2003 and 2007, inclusive. Twenty-three patients had bilateral breast cancer (1,458 total breasts). Patients were followed up for 24 months after diagnosis. The 1- and 2-year mammography yields were determined and compared with those of the general screening population. Results: 1,079 breasts had mammography at less than 1 year, and two ipsilateral recurrences (both noninvasive) were identified; 1,219 breasts had mammography during the second year, and nine recurrences (three invasive, six noninvasive) were identified. Of the 11 ipsilateral recurrences during the study, three presented with symptoms and eight were identified by mammography alone. The mammography yield was 1.9 cancers per 1,000 breasts the first year and 4.9 per 1,000 the second year. Conclusions: These data demonstrate that the mammography yield during the first 2 years after BCT is not greater than that in the general population, and they support the policy for initiating followup mammography at 1 year after BCT.

  18. Is Short-Interval Mammography Necessary After Breast Conservation Surgery and Radiation Treatment in Breast Cancer Patients?

    Energy Technology Data Exchange (ETDEWEB)

    Hymas, Richard V.; Gaffney, David K. [Department of Radiation Oncology, University of Utah, Salt Lake City, UT (United States); Parkinson, Brett T.; Belnap, Thomas W. [Intermountain Medical Center, Salt Lake City, UT (United States); Sause, William T., E-mail: william.sause@imail.org [Intermountain Medical Center, Salt Lake City, UT (United States)

    2012-06-01

    Purpose: The optimum timing and frequency of mammography in breast cancer patients after breast-conserving therapy (BCT) are controversial. The American Society of Clinical Oncology recommends the first posttreatment mammogram 1 year after diagnosis but no earlier than 6 months after completion of radiotherapy. The National Comprehensive Cancer Network recommends annual mammography. Intermountain Healthcare currently follows a more frequent mammography schedule during the first 2 years in BCT patients. This retrospective study was undertaken to determine the cancer yield mammography during the first 2 years after BCT. Methods and Materials: 1,435 patients received BCT at Intermountain Healthcare between 2003 and 2007, inclusive. Twenty-three patients had bilateral breast cancer (1,458 total breasts). Patients were followed up for 24 months after diagnosis. The 1- and 2-year mammography yields were determined and compared with those of the general screening population. Results: 1,079 breasts had mammography at less than 1 year, and two ipsilateral recurrences (both noninvasive) were identified; 1,219 breasts had mammography during the second year, and nine recurrences (three invasive, six noninvasive) were identified. Of the 11 ipsilateral recurrences during the study, three presented with symptoms and eight were identified by mammography alone. The mammography yield was 1.9 cancers per 1,000 breasts the first year and 4.9 per 1,000 the second year. Conclusions: These data demonstrate that the mammography yield during the first 2 years after BCT is not greater than that in the general population, and they support the policy for initiating followup mammography at 1 year after BCT.

  19. Establishment of qualities mammography according to the standard IEC-61267 in the laboratory of metrology of ionizing radiation of the National Center of Dosimetry and enlargement of the accreditation by ENAC; Establecimiento de las calidades de mamografia segun la norma IEC-61267 en el laboratorio de metrologia de radiaciones ionizantes del centro nacional de dosimetria (CND) y proceso de ampliacion de su acreditacion por ENAC

    Energy Technology Data Exchange (ETDEWEB)

    Roig Petit, F.; Mestre de Juan, V.; Alabau Albors, J.; Palma Copete, J.; Ruiz Rodriguez, J. C.; Pons Mocholi, S.

    2013-07-01

    The extension of the accreditation of the laboratory of the National Center Dosimetry (No. 58/LC10.036) by the national accreditation entity (ENAC), according to the ISO 17025 standard [2], for the standard qualities of mammography by the IEC 61267 comes to meet part of the needs that demand our health care environment in terms of radiation measuring instruments calibration. This work intends to publicize this enlargement commenting on the different phases of the process to get the accreditation. (Author)

  20. Breast Cancer and Mammography: Summary of the Educational Impact of a Low-Cost Mammography Program.

    Science.gov (United States)

    Gresham, Louise S.; And Others

    1988-01-01

    A mammography public education program which used newspaper press releases, local talk shows, news segments, and announcements, flyers, advertisements, and presentations to companies and select populations increased public awareness and decreased misconceptions about mammography. (CB)

  1. Comparison of standard mammography with digital mammography and digital infrared thermal imaging for breast cancer screening

    OpenAIRE

    2010-01-01

    Breast cancer is the most common malignancy in women. Screen-film mammography (SFM) has been considered the gold standard for breast cancer screening and detection. Despite its recognized value in detecting and characterizing breast disease, mammography has important limitations and its false-negative rate ranges from 4% to 34%. Given these limitations, development of imaging modalities that would enhance, complement, or replace mammography has been a priority. Digital mammography (FFDM) and ...

  2. Economics of Mammography in Norway : A Descriptive study of Mammography Screening fron Societal perspective

    OpenAIRE

    2010-01-01

    Mammography is an effective screening method to detect tumor in early stages of breast cancer, hence it saves lives and improves quality of life. I give an introduction to breast cancer, including biology, incidence and mortality and motivations for breast cancer screening. In this thesis, I map all direct and indirect costs related to the mammography program in Norway. Direct costs of mammography screening include cost per mammography, cost per recall examination, maintenance of mammograp...

  3. QA of all mammography facilities in Cyprus

    International Nuclear Information System (INIS)

    The objective of this study was to investigate the quality status of all the mammography facilities in the Republic of Cyprus, in relation with the European guidelines for quality assurance in mammography screening, for the purpose of choosing a number of them to participate in a national screening programme for breast cancer. Processing and reading conditions, as well as image quality and patient dose were recorded at twenty seven (27) centres (23 private and 4 public) in the presence of the Radiologist in charge of each facility. Processing and reading conditions included the condition and performance of the: dark room, cassettes, processor, view box and reading area. From the mammography system, the Mean Glandular Dose (MGD), the Optical Density (OD), the contrast, the High and Low Contrast Resolution (HCR and LCR) and the number of microcalcification groups visible, were recorded. Quality Control checks were performed using a CIRS phantom, 4.5 cm compressed thickness with a 50/50 composition. Measurements of OD and luminance of view boxes were performed with calibrated instruments. It was also noted whether or not the facility was equipped with a phantom for quality assurance and a densitometer. A breakdown of the problems found at the 27 facilities inspected is shown. Fifty five percent of the facilities were using view boxes that did not comply with the EC guidelines. The next most frequent problem was the mammography unit itself. The main problems were with collimation mis-alignment, filtration and more than 10% difference between set and actual values. Fourteen percent of the darkrooms were not light proof, resulting in foggy images. Wrong developer temperature, wrong film speed or wrong chemical mixing caused 6% of the processors to need further attention. Finally 3% of the screens used in the cassettes examined, were not clean enough causing many artefacts visible on the mammogram. Results are summarized, with the help of data collected with the phantom

  4. Digital mammography: Experiences in clinical application

    International Nuclear Information System (INIS)

    Target: In 1989 in the Kantonal Hospital of Lucerne conventional film-screen mammography was replaced by digital mammography. With the support of a retrospective study, it was checked whether or not digital mammography represents an equally valid diagnostic procedure in daily routine. Methods: 1204 patients were examined using digital mammography. A reevaluation of these patients was carried out using clinical and r[iological routine controls. [ditionally a r[iological and histological examination was performed in 127 cases in which excisional biopsies h[ been done, paying particular attention to detail perception. Results: The sensitivity of digital mammography achieved a total of 85%, whereas the accuracy was 81%. With [ditional use of ultrasound and galactography the sensitivity attained 91%. By reevaluation the sensitivity amounted to 87%, the accuracy remaining at 81%. The positive predictive value was especially high with 76% and 77%. Conclusion: Digital mammography offers satisfactory diagnostic performance. (orig.)

  5. CAD in breast imaging. Application in mammography and MR mammography

    International Nuclear Information System (INIS)

    Computer aided diagnosis systems (CAD-systems) are evaluated in different parts of diagnostic imaging. In breast imaging double reading which is time- and cost spending is necessary. Therefore a lot of studies evaluated the use of CAD-systems in mammography. However the rate of false-positives is too high to implement CAD-systems as double reader in routine work. In the future, improvements in this technique could perhaps change the performance of CAD-systems. (orig.)

  6. The European Energy Charter Treaty

    International Nuclear Information System (INIS)

    The history, purpose, scope and the main topics of the treaty are highlighted. Special attention is paid on problems of trading, competition, transit, technology transfer and access to capital markets; support and protection of investments; resolution of disputes; provisional clauses governing trade with GATT non-member states; structural and institutional provisions concerning the execution and function of the protocol, tasks of the Charter conference and secretariat including their equipment, rules of conduct and financing. The Charter is setting up a framework for co-operation, trade and investment in energy products and services with countries of Eastern Europe and the former Soviet Union, based on principles of free-markets and non-discrimination

  7. Einsatz der digitalen Mammographie in der Brustkrebsdiagnostik

    OpenAIRE

    Diekmann, Felix

    2010-01-01

    Mammography is not a perfect tool for detectiAuch die übrigen Hardwarekomponenten wie z.B. das Raster ermöglichen durch den on of breast cancer. Despite this fact mammography is the first choice for reduction of breast cancer mortality and for workup of suspicious lesions. Without any doubt especially digital mammography has a potential for further improvements. We were able to show that due to the higher contrast resolution of digital detectors in routine mammography the diagnostic qua...

  8. Update on new technologies in digital mammography

    Directory of Open Access Journals (Sweden)

    Patterson SK

    2014-08-01

    Full Text Available Stephanie K Patterson, Marilyn A Roubidoux Division of Breast Imaging, Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA Abstract: Despite controversy regarding mammography's efficacy, it continues to be the most commonly used breast cancer-screening modality. With the development of digital mammography, some improved benefit has been shown in women with dense breast tissue. However, the density of breast tissue continues to limit the sensitivity of conventional mammography. We discuss the development of some derivative digital technologies, primarily digital breast tomosynthesis, and their strengths, weaknesses, and potential patient impact. Keywords: screening mammography, breast cancer, contrast media, digital breast tomosynthesis

  9. X-ray shielding considerations in mammography

    International Nuclear Information System (INIS)

    Mammography is the imaging of the breast used for the diagnosis of the breast cancer or in other conditions. Most mammography installations, due to the unit's low energy do not require wall shielding in addition to the conventional 12 cm brick of density 1.6 gm/cc. However, this does not mean that the mammography, unit can be installed along with other medical units without any radiation safety consideration to staff and public. The patient workload sometimes may be of the order of 1000 mA-min/week. It is therefore, important to take into account, the staff and public protection issues in a mammography installation

  10. Comparison of written reports of mammography, sonography and magnetic resonance mammography for preoperative evaluation of breast lesions, with special emphasis on magnetic resonance mammography

    International Nuclear Information System (INIS)

    Patients with abnormal breast findings (n = 413) were examined by mammography, sonography and magnetic resonance (MR) mammography; 185 invasive cancers, 38 carcinoma in situ and 254 benign tumours were confirmed histologically. Sensitivity for mammography was 83.7%, for sonography it was 89.1% and for MR mammography it was 94.6% for invasive cancers. In 42 patients with multifocal invasive cancers, multifocality had been detected by mammography and sonography in 26.2%, and by MR mammography in 66.7%. In nine patients with multicentric cancers, detection rates were 55.5, 55.5 and 88.8%, respectively. Carcinoma in situ was diagnosed by mammography in 78.9% and by MR mammography in 68.4% of patients. Combination of all three diagnostic methods lead to the best results for detection of invasive cancer and multifocal disease. However, sensitivity of mammography and sonography combined was identical to that of MR mammography (ie 94.6%)

  11. 77 FR 59137 - Chartering and Field of Membership Manual for Federal Credit Unions

    Science.gov (United States)

    2012-09-26

    ...; ] NATIONAL CREDIT UNION ADMINISTRATION 12 CFR Part 701 RIN 3133-AE02 Chartering and Field of Membership Manual for Federal Credit Unions AGENCY: National Credit Union Administration (NCUA). ACTION: Proposed... Board, National Credit Union Administration, 1775 Duke Street, Alexandria, Virginia 22314-3428....

  12. Understanding Charter School Governance: A Case Study of a Conversion Charter School Board of Directors

    Science.gov (United States)

    Silver, David Mark

    2010-01-01

    The charter school movement has been at the forefront of educational reform since the 1990s. The majority of charter school research has focused on academic achievement and issues of access, equity, and funding. Less attention has focused on charter school governance, yet evidence suggests that governance challenges represent a significant…

  13. Demystifying Special Education in Virtual Charter Schools. Special Report. Primers on Special Education in Charter Schools

    Science.gov (United States)

    Rhim, Lauren Morando; Kowal, Julie

    2008-01-01

    This special report is a supplement to a series of special education primers created to inform state officials, authorizers and charter school operators about special education in the charter sector. The primer series also provides tools to help these stakeholders build charter school capacity to provide special education and related services. In…

  14. Mammography in Norway. Technical performance

    International Nuclear Information System (INIS)

    The Norwegian Radiation Protection Authority and the Norwegian Radium Hospital have in collaboration carried out a survey of the mammography centers in use between December 1993 and March 1994 (45 units at 41 centers). The scope of the project was to gain experience with, and to evaluate different methods for assessment of image quality. The scope was also to get an overview of the mammography practice in Norway. There were large variations in the utilisation of the equipment, which influence the image quality and probably the diagnostic accuracy. Substantial differences in equipment performance were also found. The report presents the results of the technical measurement from the survey. 18 refs., 20 figs., 4 tabs

  15. Experience with a proposed teleradiology system for digital mammography

    Science.gov (United States)

    Saulnier, Emilie T.; Mitchell, Robert J.; Abdel-Malek, Aiman A.; Dudding, Kathryn E.

    1995-05-01

    Teleradiology offers significant improvement in efficiency and effectiveness over current practices in traditional film/screen-based diagnosis. In the context of digital mammography, the increasing number of women who need to be screened for breast cancer, including those in remote rural regions, make the advantages of teleradiology especially attractive for digital mammography. At the same time, the size and resolution of digital mammograms are among the most challenging to support in a cost effective teleradiology system. This paper describes a teleradiology architecture developed for use with digital mammography by GE Corporate Research and Development in collaboration with Massachusetts General Hospital under National Cancer Institute (NCI/NIH) grant number R01 CA60246-01. Experience with a testbed prototype is described. The telemammography architecture is intended to consist of a main mammography diagnostic site serving several remote screening sites. As patient exams become available, they are forwarded by an image server to the diagnostic site over a WAN communications link. A radiologist at the diagnostic site views a patient exam as it arrives, interprets it, and then relays a report back to the technician at the remote site. A secondary future scenario consists of mobile units which forward images to a remote site, which then forwards them to the main diagnostic site. The testbed architecture is based on the Digital Imaging and Communications in Medicine (DICOM) standard, created by the American College of Radiology (ACR) and National Electrical Manufacturers Association (NEMA). A specification of vendor-independent data formats and data transfer services for digital medical images, DICOM specifies a protocol suite starting at the application layer downward, including the TCP/IP layers. The current DICOM definition does not provide an information element that is specifically tailored to mammography, so we have used the DICOM secondary capture data format

  16. Rayleigh imaging in spectral mammography

    Science.gov (United States)

    Berggren, Karl; Danielsson, Mats; Fredenberg, Erik

    2016-03-01

    Spectral imaging is the acquisition of multiple images of an object at different energy spectra. In mammography, dual-energy imaging (spectral imaging with two energy levels) has been investigated for several applications, in particular material decomposition, which allows for quantitative analysis of breast composition and quantitative contrast-enhanced imaging. Material decomposition with dual-energy imaging is based on the assumption that there are two dominant photon interaction effects that determine linear attenuation: the photoelectric effect and Compton scattering. This assumption limits the number of basis materials, i.e. the number of materials that are possible to differentiate between, to two. However, Rayleigh scattering may account for more than 10% of the linear attenuation in the mammography energy range. In this work, we show that a modified version of a scanning multi-slit spectral photon-counting mammography system is able to acquire three images at different spectra and can be used for triple-energy imaging. We further show that triple-energy imaging in combination with the efficient scatter rejection of the system enables measurement of Rayleigh scattering, which adds an additional energy dependency to the linear attenuation and enables material decomposition with three basis materials. Three available basis materials have the potential to improve virtually all applications of spectral imaging.

  17. Control of quality in mammography

    International Nuclear Information System (INIS)

    The present protocol of quality control/quality assurance in mammography is the result of the work of two regional projects realised in Latin America within the frame of ARCAL with the support of the IAEA. The first is ARCAL LV (RLA/6/043) project on quality assurance/quality control in mammography studies which analysed the present situation of the mammography in the member countries of the project which include: Bolivia, Colombia, Costa Rica, Cuba, El Salvador, Guatemala, Nicaragua, Panama, Paraguay, Peru, Dominican Republic and Republic of Venezuela and the second is ARCAL XLIX (RLA/9/035) project, whose members were Brazil, Colombia, Cuba, Chile, Mexico, and Peru, worked the application of Basic Safety Standards for the protection against ionising radiation with the aim to improve radiation protection in X-ray diagnosis medical practices through the implementation of the Basic Safety Standards (BSS) related to x-ray diagnosis in selected hospitals located in each country involved in the project. The work of both projects had been consolidated and harmonized in the present publication

  18. Choice without Equity: Charter School Segregation Selección sin equidad: Segregación escolar en las escuelas charter Escolha sem equidade: Segregação escolar nas escolas charter

    Directory of Open Access Journals (Sweden)

    Erica Frankenberg

    2011-01-01

    Full Text Available

    The political popularity of charter schools is unmistakable. This article explores the relationship between charter schools and segregation across the country, in 40 states, the District of Columbia, and several dozen metropolitan areas with large enrollments of charter school students in 2007-08. The descriptive analysis of the charter school enrollment is aimed at understanding the enrollment and characteristics of charter school students and the extent to which charter school students are segregated, including how charter school segregation compare to students in traditional public schools.  This article examines these questions at different levels, aggregating school-level enrollment to explore patterns among metropolitan areas, states, and the nation using three national datasets.  Our findings suggest that charters currently isolate students by race and class. This analysis of recent data finds that charter schools are more racially isolated than traditional public schools in

  19. Barriers to Mammography among Inadequately Screened Women

    Science.gov (United States)

    Stoll, Carolyn R. T.; Roberts, Summer; Cheng, Meng-Ru; Crayton, Eloise V.; Jackson, Sherrill; Politi, Mary C.

    2015-01-01

    Mammography use has increased over the past 20 years, yet more than 30% of women remain inadequately screened. Structural barriers can deter individuals from screening, however, cognitive, emotional, and communication barriers may also prevent mammography use. This study sought to identify the impact of number and type of barriers on mammography…

  20. Teacher community in elementary charter schools.

    Directory of Open Access Journals (Sweden)

    Marisa Cannata

    2007-05-01

    Full Text Available The organizational context of charter schools may facilitate the formation of a strong teacher community. In particular, a focused school mission and increased control over teacher hiring may lead to stronger teacher professional communities. This paper uses the 1999-2000 Schools and Staffing Survey to compare the level of teacher community in charter public and traditional public schools. It also estimates the effect of various charter policy variables and domains of school autonomy on teacher community. Charter school teachers report higher levels of teacher community than traditional public school teachers do, although this effect is less than one-tenth of a standard deviation and is dwarfed by the effect of a supportive principal, teacher decision-making influence, and school size. Charter public schools authorized by universities showed lower levels of teacher community than those authorized by local school districts. Teachers in charter schools that have flexibility over tenure requirements and the school budget report higher levels of teacher community. This study reveals that charter schools do facilitate the formation of strong teacher communities, although the effect is small. The analysis also suggests that the institutional origin of the charter school and specific areas of policy flexibility may influence teacher community.

  1. Charters, K-12 Aid Roiling Wash. State

    Science.gov (United States)

    Ujifusa, Andrew

    2012-01-01

    A tight race for governor, the heavy burden of rebuilding a school funding system recently declared unconstitutional, and a fourth ballot measure in two decades on charter schools has placed Washington state on an intense--and unpredictable--road for education this year. Washington is one of nine states that do not allow charter schools, and the…

  2. Educational Charter Schools: A Civil Rights Mirage?

    Science.gov (United States)

    Frankenberg, Erica

    2011-01-01

    The idea of charter schools arose as a means to allow for innovation by creating schools that were free from traditional regulations, but were held accountable for their performance. More recently, however, charter school advocates have suggested that increasing school choice options will create competition that improves the quality of education…

  3. State Policy Regimes and Charter School Performance

    Science.gov (United States)

    Pelz, Mikael L.

    2015-01-01

    The policy diffusion framework is critical to understanding the spread of policy innovations such as charter schools in the United States. This framework, however, is less instructive in explaining the state-by-state configuration of these policies. What explains the wide variation in charter school policy among states? This study addresses this…

  4. The Uneven Performance of Arizona's Charter Schools

    Science.gov (United States)

    Chingos, Matthew M.; West, Martin R.

    2015-01-01

    Arizona enrolls a larger share of its students in charter schools than any other state in the country, but no comprehensive examination exists of the impact of those schools on student achievement. Using student-level data covering all Arizona students from 2006 to 2012, we find that the performance of charter schools in Arizona in improving…

  5. Charter Schools: Education Reform or Business?

    Science.gov (United States)

    Tienken, Christopher H.

    2011-01-01

    As charter schools multiply, public school teachers and administrators need to understand the policy landscape in which charters are skimming money from their traditional local public schools, making scarce resources even scarcer. In this essay, the author discusses a related phenomenon that is part of some school reform plans--the reconstitution…

  6. Charter Schools and the Teacher Job Search

    Science.gov (United States)

    Cannata, Marisa

    2011-01-01

    This article examines the position of charter schools in prospective elementary teachers' job search decisions. Using a labor market segmentation framework, it explores teacher applicants' decisions to apply to charter schools. The data come from a mixed-methods longitudinal study of prospective teachers looking for their first job. This article…

  7. 77 FR 62621 - Advisory Committee Charter Renewals

    Science.gov (United States)

    2012-10-15

    ... NW., Washington, DC 20420; telephone (202) 461-7028; or email at vivian.drake@va.gov . To view a copy of a VA Federal advisory committee charter, visit http://www.va.gov/advisory . Dated: October 9, 2012... mission of the Department of Veterans Affairs (VA) and renewing their charters would be in the...

  8. Help for Charters in Race for Space

    Science.gov (United States)

    Robelen, Erik W.

    2008-01-01

    The world of charter school facilities is sometimes strange. Many charter operators have had to show considerable creativity and resourcefulness in finding a place to educate their students, whether it's a former K-Mart or car dealership, a church facility, or space in an office complex. Obtaining and paying for adequate facilities are often big…

  9. Earth Charter, ESD and Chinese Philosophies

    Science.gov (United States)

    Liu, Yunhua; Constable, Alicia

    2010-01-01

    This article examines the relationship between the Earth Charter and education for sustainable development (ESD), as part of the UN Decade of Education for Sustainable Development. The areas of shared interest between the two are assessed and the invaluable nature of the Earth Charter as a resource outlining global values and principles for a…

  10. Physical aspects of digital mammography technology

    International Nuclear Information System (INIS)

    The establishment of digital mammography systems constitutes a slow process, the reason for this being the general need of particular image quality in mammography. This article provides an overview of the physical basis of digital mammography with high image quality and dose as low as reasonably achievable. The trade-off of high contrast resolution and effective quantum efficiency of the imaging system on the one hand, and the demand of high spatial resolution or very small pixel size on the other hand is discussed. The actual status of the available digital detector technology for mammography is described. The digital systems presently available are superior to conventional screen-film mammographic systems with respect to contrast resolution. An outlook on possible further developments in the field of digital mammography is presented. (orig.)

  11. Mammography calibration: Factor or fit?

    International Nuclear Information System (INIS)

    Dose measurements in mammography x-ray have become more important and a basic path in quality assurance programmes. It is recognized by the international guidelines that it is necessary to have calibration services offered for mammography beams in order to help the improvement of the clinical diagnosis. Major efforts have been made by several laboratories in order to establish an appropriate and traceable calibration infrastructure and to provide the basis for a quality control programme in mammography. The indication of a dosimeter, whose reference point is positioned at the point of test, is compared with the conventional true value of the quantity to be measured. The calibration coefficient is then the ratio of the conventional true value to the indicated. The Primary Standard Dosimetry Laboratory - PSDL or the Secondary Standard Dosimetry Laboratory - SSDL provides the calibration coefficient of the dosimeters in reference to the Half Value Layers - HVL implemented in their laboratories. The dosimetry calibration data is enough when the user has the same system as the laboratory where the ionization chamber has been calibrated. However, there are other calibration systems that have different calibration qualities implemented using different combinations of anode and filter and, therefore, there is no direct relation with the calibration coefficient. How to deal with this? There are two different ways to obtain calibration coefficients when the user's implemented qualities are different from the calibration laboratory's qualities. The first is the interpolation of each calibration coefficient stated in the certificate. The second is the fit of all calibration coefficients, separately for non-attenuated and attenuated beam qualities, to obtain a function by which the calibration coefficients can be determined at each beam quality. The second one includes the statistical fluctuation. The dosimetry calibration data must fit an analytical form, as for example a

  12. The Diagnostic Accuracy of Digitized Mammography

    Directory of Open Access Journals (Sweden)

    M. Guiti

    2008-06-01

    Full Text Available Background/Objective: Digitized mammography has several advantages over screen-film radiography in data storage and retrieval, making it a useful alternative to screen-film mammography in screening programs. The purpose of this study was to determine the diagnostic accuracy of digitized mammography in detecting breast cancer. "nPatients and Methods: 185 women (845 Images were digitized at 600 dpi. All images were reviewed by an expert radiologist. The mammograms were scored on a scale of breast imaging reporting and data system (BIRADS. The definite diagnosis was made either on the pathologic results of breast biopsy, or upon the follow-up of at least one year. The overall diagnostic accuracy of digitized mammography was calculated by the area under receiver operating characteristic curve."nResults: 242 sets of mammograms had no lesions. The total counts of masses, microcalcifications or both in one breast were 39 (11%, 42 (12%, and 25 (7%, respectively. There were 321 (92% benign and 27 (8% definite malignant lesions. The diagnostic accuracy of digitized images was 96.34% (95% CI: 94%-98%."nConclusion: The diagnostic accuracy of digitized mammography is comparably good or even better than the published results. The digitized mammography is a good substitute modality for screen-film mammography in screening programs.

  13. Building an intranet digital mammography case library

    Science.gov (United States)

    Zhang, Hong; Lou, Shyhliang A.; Fan, Yu; Sickles, Edward A.; Huang, H. K.

    2000-05-01

    To practice mammography diagnosis effectively, radiologists expect convenient access to well-organized and authoritative mammography related information, especially when there is case in question. The purpose of this study is to build infrastructural diagnosis support by incorporating various clinical information into a digital mammography case library, and allow user to search the library based on mammographic findings. The digital mammography case library has a three- tier architecture: (1) Back-end mammography databases integrate multimedia clinical information from various operational systems, including RIS and PACS. Cases are stored in a finding index database powered by an object-relational database with finding-coded reports, which are modeled around the ACR BI-RADS (American College of Radiology, Breast Imaging Report and Data System) standard. (2) The middle-end application controllers process application logic, such as user authorization, HTTP request handling, database connection and dynamic HTML page generation. (3) Web-based user interface is developed for authorized Intranet personnel to formulate query based on radiological finding (such as mass, calcification and architectural distortion), shape and assessment, using ACR BI-RADS specified lexicon. The case library so far has 103 cases selected from over 800 digital mammography studies carried out at the Mt. Zion hospital, UCSF, during an on-going digital telemammography project. We believe that an Intranet based digital mammography case library with mammographic finding search capability facilitates continuous medical education and online decision support, by providing exemplary study to compare with case in question.

  14. QA of mammography systems in Panama: Seven year experience

    International Nuclear Information System (INIS)

    Mammography quality assurance is a programme established by the health care facility to ensure that mammography is being performed in compliance with minimum standards established by the national regulation. These standards include interacting with patients, testing of imaging equipment, evaluation of clinical films, and qualifications of personnel. The goal of the programme is to maintain optimum image quality standards using an appropriate but not excessive radiation dose. The three primary responsible persons for this program are the radiologist, mammography X ray technologist, and the medical physicist. In Panama, mammography systems are submitted to QC tests on an annual basis. The national protocol for QC testing is based on the recommendations issued by the American College of Radiology and the AAPM criteria. When a new mammography system is installed or repaired, the Department of Radiological Health (DSR) must verify that the equipment parameters comply with the required acceptance criteria. If the equipment tests reveal any abnormality, the maintenance service company must perform the necessary repairs, correcting the anomalies outlined in the DSR report. The results of all QC tests performed on mammography systems in Panama during the last seven years were reviewed. The annual tests performed basically consisted of: 1. Mechanical: compression strength (in Panama should be between 25-40 pounds), accuracy of angle indicator, accuracy of thickness indicator, thickness indicator reproducibility, radiation field definition, light/radiation coincidence, focal point size. 2. Dosimetric: tube potential accuracy, time/output linearity, HVL, mean glandular dose, automatic compensation with variable thickness and variable tube potential, output exposure, reproducibility of time, exposure and tube potential. Optical density, resolution, contrast, screen/film contact and evaluation of artefacts. There are 46 mammography apparatus in Panama. Nine belong to the

  15. Study on patient exposure from mammography, 3

    International Nuclear Information System (INIS)

    Risks and benefits of the patient from mammography performed in Japan were estimated, and the indication of mammography were discussed. 1) Breast cancers induced by mammography were estimated based on the average breast dose, the average life span, risks of radiation-induced breast cancer and the breast cancer significant factor. 2) The breast cancer significant factor was calculated, similar to those of leukemia significant factor by Hashizume, from latent periods of radiation-induced breast cancer and the excess breast cancer induction rate in female A-bomb survivors. 3) Numbers of the deaths and Lost-years were calculated from risks of radiation-induced breast cancer, incidence of breast cancer by mammography, cure rate of breast cancer, average life span and latent period of radiation-induced breast cancer. 4) Numbers of the increased life and years saved were calculated from the improved rate of the ability of diagnosis, frequency of mammography, the average life span and cure rate of breast cancer. 5) Induction of leukemia, lung cancer and thyroid cancer by mammography also were investigated. Its contribution was not significant, compared to the induction of breast cancer. 6) Comparing risk and benefit, the latter was much higher than the former by factors of 71-76. This was suggested the efficacy of mammography. 7) From a pointview of risk and benefit, routine mammography is contraindicative for 10-19 years old women because of large risk, the indication must be scrutinized for 20-29 years old ones, and the benefit increases with age for over 30 years old ones so that mammography was positively admitted for the symptomatic women. (author)

  16. A new mammography dosimetric phantom

    International Nuclear Information System (INIS)

    Breast phantoms produced with tissue-equivalent materials are used in an attempt to simulate glandular and adipose tissues, in terms of X-ray attenuation and density. In this work, a set of breast tissue-equivalent phantoms (BTE phantoms) with semicircular shapes of different thicknesses and compositions were produced. Such phantoms may be used in the measurement of the incident air kerma (K i) and the mean glandular dose (D G) delivered to patients undergoing mammography. To characterise the materials used to produce the phantoms, a series of 17-keV X-ray attenuation coefficient measurements were performed. The carbon-nitrogen-hydrogen elemental composition and the densities of the tissue-equivalent materials were also determined and compared with values available in the literature. Linear attenuation coefficients of 0.724 and 0.923 cm-1 were determined, respectively, for adipose and glandular tissues. Such values agree with data available in the literature. On the basis of the results obtained in this work, it is suggested that BTE phantoms are used instead of polymethyl methacrylate phantoms to select exposure parameters (kV, mAs and target/filter combination) specific for breast glandularities from 0 to 50 % in the optimisation of doses in mammography. (authors)

  17. Benefits of visualization in the mammography problem

    DEFF Research Database (Denmark)

    Khan, Azam; Breslav, Simon; Glueck, Michael;

    2015-01-01

    is not an effective technique. As these studies were performed over many years with a variety of goals and experimental conditions, we sought to re-evaluate the use of visualization as an aid in solving Bayesian problems. Many of these studies used the classic Mammography Problem with visualizations portraying...... condition and a text-legend condition where all nested-set problem values were given to eliminate the need for participants to estimate or calculate values. Seven hundred participants evaluated these seven conditions on the classic Mammography Problem in a crowdsourcing system, where micro-interaction data...... the Mammography Problem....

  18. Radiogenic breast cancer risk and mammography

    International Nuclear Information System (INIS)

    There is a general concern that the risks from mammography screening in inducting radiogenic breast cancer may outweigh the possible benefits to be derived from it. A review of epidemiological, case-control and cohort studies of radiogenic breast cancer, age-specific incidence and dose and dose-rate relationship reveals that such a fear is unfounded. The dose to the breast tissues in a quality assured mammography screening programme falls far below the levels that were observed to produce increased relative risk. The age-specific incidence rates also indicate that the need for mammography is for the women of age at which the relative risk is minimum

  19. An evaluation of musculoskeletal discomfort experience by radiographers performing mammography

    International Nuclear Information System (INIS)

    The aim of this study was to establish whether breast screening radiographers experience any problems of musculoskeletal discomfort, and if so the nature and extent of these problems. The study was then further extended to investigate and determine possible occupational, causal or contributory factors, and to suggest recommendations to help alleviate any discomfort. To investigate this problem five main approaches were undertaken. These consisted of; a national survey, an observational study, the comparison of the physical measurements of the mammography units with anthropometric data, a detailed task analysis, and a body mapping study. The national survey set out to determine if the nature and frequency of such problems were higher in mammography than in other areas of radiography or in the general population. Additionally, comparisons were made with non-radiographic staff working at the same breast screening centres. Video recordings of radiographers performing breast screening were also made and posture analysis performed on these data. A detailed task analysis was conducted to identify interaction points and possible problems between the radiographer and the equipment which she is required to use. Physical measurements of the mammography units were made and compared with anthropometric measurements and guidelines. The body mapping study measured the build up of discomfort throughout the working day on several different mammography units. The results from the survey questionnaire indicated that some breast screening radiographers do experience musculoskeletal problems, and that these are different in nature and prevalence from the musculoskeletal discomfort reported by the two control groups. The prevalence of back pain reported by radiographers undertaking mammography was higher than that present in the normal population. No comparison could be made with other body areas as data regarding other types of musculoskeletal discomfort in the general population are

  20. Does Charter Status Determine Preferences? Comparing the Hiring Preferences of Charter and Traditional Public School Principals

    OpenAIRE

    Marisa Cannata; Mimi Engel

    2012-01-01

    The academic success of any school depends on its teachers. However, relatively little research exists on the qualities principals value in teacher hiring, and we know almost nothing about charter school principals’ preferences. This article addresses this gap in the literature using survey results for a matched sample of charter and traditional public school principals. We compare regression-adjusted survey responses of charter and traditional public school principals to examine whether char...

  1. AN ANALYSIS OF THE PERCEPTION OF CHARTERED ACCOUNTANT TRAINEES REGARDING ACCESS TO THE ACCOUNTING PROFESSION AND PROFESSIONAL TRAINING NEEDS

    OpenAIRE

    Bunea Ștefan; Sãcãrin Marian; Gîrbinã Maria Mãdãlina

    2013-01-01

    In Romania, the certification of the quality of chartered accountant is accomplished by CECCAR(i). It is conditioned by the completion of the period of initial training. A part of this period is provided by the universities, while the other part is provided by CECCAR through the national 3-year internship programme. The objective of our survey was to analyse the way in which chartered accountant trainees perceive the access to the accounting profession, their own limitations in terms of compe...

  2. Implementation of the European protocol for quality control of the technical aspects of mammography screening in Bulgaria

    International Nuclear Information System (INIS)

    The results from the national pilot project on implementation of the European protocol for the quality control (QC) of the technical aspects of mammography screening as well as the European protocol for dosimetry in mammography in Bulgaria are presented. A QC programme for mammography equipment and a standardised measurement protocol were created. The full QC programme was tested on four mammography units of different types and ages. A national survey was performed for entrance surface air kerma (ESAK) on 20 units using a 45 mm PMMA standard phantom. Average glandular dose (AGD) was calculated using the conversion coefficients from the European dosimetry protocol. The survey demonstrated considerable differences in the technical condition of the mammography units that resulted in varying image quality. The measured values of ESAK showed significant variations. Doses for ∼45% of the units were found to be below the European reference level. The values for AGD ranged from 0.35 to 3.47 mGy. The main problems found were film processing, optical density (OD) control settings and AEC adjustment. The results showed the importance of film OD measurements parallel to dose measurements. The X-ray mammography in the country needs optimisation. Comprehensive quality assurance programme should be adopted in all departments covering permanent QC of the equipment, image quality and breast dose. (authors)

  3. The European Energy Charter Treaty

    International Nuclear Information System (INIS)

    The scope of the treaty is highlighted. The treaty consists of a preamble and 50 articles and is divided into 8 parts and supplemented with 14 annexes. The parts of the treaty deal with the following: (i) definitions and purpose of the treaty; (ii) general topics such as trading, competition, transit, technology transfer and access to capital markets; (iii) support and protection of investments; (iv) list of regulations; (v) resolution of disputes; (vi) provisional clauses governing trade with GATT non-member states; (vii) structural and institutional provisions concerning the execution and function of the protocol, tasks of the Charter conference and secretariat including their equipment, rules of conduct and financing; and (viii) final provisions. (J.B.)

  4. Cost-effective mammography screening in Korea. High incidence of breast cancer in young women

    International Nuclear Information System (INIS)

    The epidemiological characteristics of breast cancer in Korean women are different from the characteristics reported in Western women. The highest incidence rate occurs in Korean women in their 40s. The purpose of this study was to determine the most cost-effective screening interval and target age range for Korean women from the perspective of the national healthcare system. A stochastic model was used to simulate breast cancer screenings by varying both the screening intervals and the age ranges. The effectiveness of mammography screening was defined as the probability of detecting breast cancer in the preclinical state and the cost was based on the direct cost of mammography screening and the confirmative tests. The age-specific mean sojourn times and the sensitivity of the mammography were applied in the stochastic model. An optimal cost-effectiveness was determined by the incremental cost-effectiveness ratio and lifetime schedule sensitivity. Sensitivity analyses were undertaken to assess parameter uncertainty. The selected cost-effective strategies were: the current biennial mammography screenings for women who are at least 40 years old; biennial screening for women between the ages of 35 and 75 years; and a combination strategy consisting of biennial screening for women aged between 45 and 54 years, and 3-year interval screening for women aged between 40 and 44 years and 55 and 65 years. Further studies should follow to investigate the effectiveness of mammography screening in women younger than 40 years in Asia as well as in Korea. (author)

  5. CONTRAST ENHANCED SPECTRAL MAMMOGRAPHY (CESM (REVIEW

    Directory of Open Access Journals (Sweden)

    N. I. Rozhkova

    2015-01-01

    Full Text Available The problem of early diagnosis of a breast cancer is extremely actual. Growth of incidence at women from 19 to 39 years increased for 34% over the last 10 years. It defines need of acceleration of development and deployment of the latest technologies of identification of the earliest symptoms of diseases. The x-ray mammography is the conducting method among of all radiological methods of diagnostics. Nevertheless a number of restrictions of method reduces its efficiency. The technologies increasing informational content of x-ray mammography – the leading method of screening – due to use of artificial contrasting and advantages of digital technologies are constantly developed. In this review it is described works, in which the authors having clinical experience of application of CESM – contrastenhanced spectral mammography on representative group of women. Positive sides and restrictions of new technology in comparison with mammography, ultrasonography and MRT are shown in this article.

  6. Problems in film processing for mammography

    International Nuclear Information System (INIS)

    It had not been surveyed in Japan how film processors influenced on the mammographic image quality. Film processors in 43 mammography facilities in Kinki area, mainly Osaka prefecture, were surveyed in this study. Technical indicators of mammography quality such as contrast and maximum density were examined together with processing speed and temperature. Contrast (mean ±SD) was 3.23±0.28 (UM-MA film, Fuji) or 3.24±0.15 (Min-R2000 film, Kodak). Maximum density (mean±SD) was 3.86±0.11 (UM-MA) or 3.77±0.08 (Min-R2000). Processing speed and temperature were varied in the facilities. It can be considered that the difference on mammography quality depends on own processing condition in each facility. In order to perform quality assurance for mammography, it is important and needed to stabilize and standardize their processing conditions. (author)

  7. Heavy-ion mammography and breast cancer

    International Nuclear Information System (INIS)

    Heavy-ion radiography is a new diagnostic imaging technique developed in our laboratory that produces superior density resolution at low radiation doses. Heavy-ion mammography has now emerged as a low-dose, safe, reliable, noninvasive diagnostic radiological procedure that can quantitate and image very small differences in soft tissue densities in the breast tissues of patients with clinical breast disease. The improved density resolution of heavy-ion mammography over conventional X-ray mammography and breast xerography provides the potential of detecting small breast cancers of less than 1 cm diameter. The radiation dose to the breast from carbon-ion mammorgraphy is about 50 mrad or less, and can potentially be only a fraction of this level. The results of the present clinical trial in progress of heavy-ion mammography in 37 patients, thus far studied, are extremely encouraging, and warrant continued study for application to the early diagnosis of breast cancer in women

  8. Inequalities in the use of mammography in Spain : effect of caring for disabled family

    NARCIS (Netherlands)

    Sanz-Barbero, Belen; Sopacua, Maurice; Otero-Garcia, Laura; Borda-Olivas, Alfredo; Zunzunegui, Maria Victoria

    2012-01-01

    To examine the association between caring for disabled household members and the use of mammography in Spain during the 2 years before the interview. Weighted cross-sectional data from the 2006 National Health Survey in Spain. Using logistic regression models we analyzed the association between the

  9. Community Partnerships, Food Pantries, and an Evidence-Based Intervention to Increase Mammography among Rural Women

    Science.gov (United States)

    Bencivenga, Marcyann; DeRubis, Susan; Leach, Patricia; Lotito, Lisa; Shoemaker, Charles; Lengerich, Eugene J.

    2008-01-01

    Context: Multiple national agencies and organizations recommend that women age 40 years and older have an annual screening mammogram. Women who are poor, less educated, lack a usual source of care, and reside in rural Appalachia are less likely to have had a recent mammogram. Purpose: To increase use of mammography among a rural Appalachian…

  10. Evaluation of contrast-enhanced digital mammography

    International Nuclear Information System (INIS)

    Purpose: The goal of this prospective study was to evaluate the possible diagnostic benefits of contrast-enhanced digital mammography (CEDM) over conventional mammography. Materials and methods: Our analysis included data from 70 patients with a total of 80 lesions (30 malignant and 50 benign). A series of contrast-enhanced images was acquired from each patient using a modified imaging system (GE Senographe 2000D with copper filter) suitable for displaying iodine contrast medium. After the mask image had been taken, the contrast medium was administered using a dosage of 1 ml/kg body weight at a rate of 4 ml/s. Three contrast-enhanced images in the cranio-caudal projection plane were then captured at intervals of 60 s. The mask image was logarithmically subtracted from the contrast-enhanced images. We performed a ROC analysis of diagnostic quality with three readers. Results: On average, 5.66 more malignant lesions were detected with the addition of digital dynamic contrast mammography versus conventional mammography alone. The sensitivity was increased from an average of 0.43 in conventional mammography to an average of 0.62 with contrast mammography. Even in dense breast parenchyma, the sensitivity increased from an average of 0.35-0.59. In the multi-reader-ROC analyses of all readers, the differences in the AUC with p = 0.02 (BI-RADS) proved statistically significant in all cases. The Wilcoxon test showed that Readers I and II primarily used the CEDM to upgrade enhancing lesions to a higher BI-RADS category or a higher probability of malignancy. These two readers benefited most from the CEDM in the ROC analysis. Conclusion: Overall, we conclude that the addition of dynamic digital subtraction mammography to conventional mammography can significantly improve diagnostic quality. The increased sensitivity is particularly pronounced in the case of dense breast tissue.

  11. Update on new technologies in digital mammography

    OpenAIRE

    Patterson SK; Roubidoux MA

    2014-01-01

    Stephanie K Patterson, Marilyn A Roubidoux Division of Breast Imaging, Department of Radiology, University of Michigan Health System, Ann Arbor, MI, USA Abstract: Despite controversy regarding mammography's efficacy, it continues to be the most commonly used breast cancer-screening modality. With the development of digital mammography, some improved benefit has been shown in women with dense breast tissue. However, the density of breast tissue continues to limit the sensitivity of conven...

  12. Mammography and breast sonography in transsexual women

    International Nuclear Information System (INIS)

    Data on the necessity of performing screening mammographies in transsexual women are lacking. The main objective of this study was to assess the possibility to perform mammography and breast sonography in transsexual women. Fifty Dutch-speaking transsexual women were interviewed about the following: attitude towards mammography and breast sonography, importance attributed to and satisfaction with breast appearance, opinion about the necessity of breast check-up, expectations regarding discomfort during the exams and knowledge about the breast surgery. A fasting blood sample, clinical breast exam, mammography and breast sonography were performed. At mammography the following parameters were noted: density, technical quality, location of the prostheses, presence of any abnormalities and painfulness. At sonography the following parameters were recorded: density, presence of cysts, visualisation of retro-areolar ducts or any abnormalities. Twenty-three percent of patients are not aware of the type of breast implants and 79% do not know their position to the pectoral muscles. Patient satisfaction with the appearance of their breasts was rather high (7.94 on a scale of 0-10). Mean expected and experienced pain from mammography was low (4.37 and 2.00 respectively). There was no statistically significant difference in expected pain between those who already had mammography and those who did not. There was a significant positive correlation between the expected and the experienced pain. Mammography and breast sonography were technically feasible and no gross anomalies were detected. Since both exams were judged as nearly painless, 98% of transsexual women intended to come back if they would be invited. Since breast cancer risk in transsexual women is largely unknown and breast exams are very well accepted, breast screening habits in this population should not differ from those of biological women.

  13. Mammography and breast sonography in transsexual women

    Energy Technology Data Exchange (ETDEWEB)

    Weyers, S., E-mail: steven.weyers@ugent.b [Department of Gynecology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent (Belgium); Villeirs, G.; Vanherreweghe, E. [Department of Radiology, Ghent University Hospital, Ghent (Belgium); Verstraelen, H. [Department of Gynecology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent (Belgium); Monstrey, S. [Department of Plastic Surgery, Ghent University Hospital, Ghent (Belgium); Van den Broecke, R.; Gerris, J. [Department of Gynecology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent (Belgium)

    2010-06-15

    Data on the necessity of performing screening mammographies in transsexual women are lacking. The main objective of this study was to assess the possibility to perform mammography and breast sonography in transsexual women. Fifty Dutch-speaking transsexual women were interviewed about the following: attitude towards mammography and breast sonography, importance attributed to and satisfaction with breast appearance, opinion about the necessity of breast check-up, expectations regarding discomfort during the exams and knowledge about the breast surgery. A fasting blood sample, clinical breast exam, mammography and breast sonography were performed. At mammography the following parameters were noted: density, technical quality, location of the prostheses, presence of any abnormalities and painfulness. At sonography the following parameters were recorded: density, presence of cysts, visualisation of retro-areolar ducts or any abnormalities. Twenty-three percent of patients are not aware of the type of breast implants and 79% do not know their position to the pectoral muscles. Patient satisfaction with the appearance of their breasts was rather high (7.94 on a scale of 0-10). Mean expected and experienced pain from mammography was low (4.37 and 2.00 respectively). There was no statistically significant difference in expected pain between those who already had mammography and those who did not. There was a significant positive correlation between the expected and the experienced pain. Mammography and breast sonography were technically feasible and no gross anomalies were detected. Since both exams were judged as nearly painless, 98% of transsexual women intended to come back if they would be invited. Since breast cancer risk in transsexual women is largely unknown and breast exams are very well accepted, breast screening habits in this population should not differ from those of biological women.

  14. Quality assurance in X-ray mammography

    International Nuclear Information System (INIS)

    Full text: Introduction: Breast Cancer (BC) is the most common cancer in the country, with a smooth upward trend. X-ray mammography is the gold standard in the diagnosis of breast cancer. The study was carried out with X-ray radiation with certain degree of risk of radiation carcinogenesis in a patient. There are international recommendations setting high requirements for the quality of mammography. What you will learn: In 2006 the fourth edition of the European recommendations for ensuring quality in screening and diagnosis of breast cancer was published. It stipulates the requirements to both technical and physical aspects of mammography screening and the quality of work of the radiologist, technologist, pathologist and surgeon. Some multidisciplinary aspects of quality assurance in the diagnostic process are discussed. Discussion: Some often neglected aspects in quality are discussed. A standard plexiglas phantom for each mammography system for daily tests holding of image quality and dose evaluation is necessary. In the dark room appropriate equipment for assessment of the developing process has be available, as often it is the main reason for the poor quality of the mammographic images. In digital mammography the conditions for mammograms reading - light and brightness of the room and equipment and monitor quality are neglected. Conclusion: One of the basic principles of radiation protection in diagnostic radiology required to obtain images with the necessary diagnostic information with minimal exposure to the patient. This is possible only in compliance with all aspects of quality assurance in X-ray mammography

  15. Screening mammography, public perceptions, and medical liability

    International Nuclear Information System (INIS)

    Purpose: To outline the most common sources of raising malpractice claims in screening mammography and to discuss the related medical litigation issues in the light of the evidence-based medicine. Methods and material: Electronic and manual search of the relevant literature. Results: The most common cause of malpractice is the delayed diagnosis of breast cancer. The plaintiff must establish that the radiologist was negligent and the delay in diagnosis caused injury to the patient. Literature shows that mammography does not always detect breast cancer, and even skilled radiologists may periodically miss malignant lesions. Also, delay in diagnosis does not always affect treatment and prognosis. Over-promotion of screening mammography has made disproportionately difficult for a defendant radiologist to prevail in a malpractice lawsuit. Thus, screening mammography is at stake, although it saves lives. The public and legal system should be educated about biological processes, medical practice, and the limitations of screening mammography. Conclusion: If mammography is to survive medical litigation and continue to save lives a major reform in public perception, in the stance of the mass media, and in the ability of legal system to understand medicine is required. Physicians and medical associations have an important role to play

  16. Assessment of mammography in Costa Rica

    International Nuclear Information System (INIS)

    An evaluation of national mammographic equipment was conducted, due to the increasing incidence of breast cancer in Costa Rican women. From June 2002 to October 2003, 2 of the 3 global indicators of image quality were evaluated, (mean glandular dose and phantom image) in 26 mammography machines facilitated by radiologists in charge of the same. The mean glandular dose found was 1.75 ± 0.60 mGy with a range of 0.8 a 2.56. Regarding quality image, 73% of the evaluated equipment was able to see 4 or more fibers, 53% saw 3 or more groups of microcalcifications and 82% saw 3 or more mass groups. All mean glandular doses were below the international reference dose value of 3 mGy. However, the analysis of phantom images showed that only 54% of all the equipment had a total score (sum of mass groups, fibers and microcalcifications) superior or equal to 10, as expected. A correct diagnosis that could eventually save the patient's life is the main objective of a mammogram; the factors that are degrading the images must be found and it might be necessary to increase the doses to achieve this. This study demonstrates the urgent necessity to introduce permanent quality control programs that will provide excellent images with the lowest internationally recommended doses.(author)

  17. Media glandular dose in mammography

    International Nuclear Information System (INIS)

    The objective of this work was to determine the media glandular dose of the patients group who most frequently are exposed at mammographic studies in the General Hospital of Zone No. 1 of IMSS in Zacatecas, later to compare this dose with the value that establishes the Mexican Official Standard and to know risk-benefit that a patient is exposed when it is realized studies of this nature. This with the purpose of to know if the patients who are realized this type of studies are exhibited to irradiations of unnecessary way. In order to obtain the media glandular dose, first it was choose the age group of feminine population that is predominant to this suffering. Of the classification of the age group it was determine the frequency of each thickness of mamma, and on the basis of the thickness of the compressed mamma the conditions were registered with it radiates the patient. When having the age and compressed mamma thickness of patient and the voltage, current, anode/filter that uses the mammography equipment for to radiate it was calculated the media glandular dose. The media glandular dose was calculated using two algorithms proposed in literature and thermoluminescent dosemeters. For the case of the thermoluminescent dosemeters were used two phantoms. In this study was detected that the limits, with that they radiate the patients who are exposed at mammographic studies it is by underneath of 3 mGy. Finally, it was detected that the Mexican Official Standard lacks of elements to offer radiological limits for the mammography area, because in this standard they are excluded the radiological limits for anode and filter of Mo/Rh and Rh/Rh. To know the dose applying these anodes and filters is of extreme importance because 85% of the population that is exposed to this studies type was radiated with anode and filter of Mo/Rh and Rh/Rh. (Author)

  18. Study on knowledge, experiences and barriers to mammography among working women from Delhi

    Directory of Open Access Journals (Sweden)

    A Khokhar

    2015-01-01

    230 (83.5% women over 40 years of age had never got a mammogram done. Main reason 74 (38.5% cited for this was that they did not know/were not aware they were supposed to go for mammography. CONCLUSION: As knowledge and utilization of mammography is low among women, there is a need to have a multipronged strategy to inform women about mammography and bring about a behavioral change along with having a formal national level screening guidelines for breast cancer early detection.

  19. Family/Friend Recommendations and Mammography Intentions: The Roles of Perceived Mammography Norms and Support

    Science.gov (United States)

    Molina, Yamile; Ornelas, India J.; Doty, Sarah L.; Bishop, Sonia; Beresford, Shirley A. A.; Coronado, Gloria D.

    2015-01-01

    Identifying factors that increase mammography use among Latinas is an important public health priority. Latinas are more likely to report mammography intentions and use, if a family member or friend recommends that they get a mammogram. Little is known about the mechanisms underlying the relationship between social interactions and mammography…

  20. Mammography

    International Nuclear Information System (INIS)

    The mamma anatomy are showed with the main characteristics for the mamography examination. The energy band, the additional filtration, the half-value thickness are also mentioned. The evaluation in the exposure and the doses in the mamography examination are described with a quality control for obtention the best image. (C.G.C.)

  1. Charterer's Liability Insurance : A Type of Marine Insurance

    OpenAIRE

    2007-01-01

    The “charterer’s liability insurance” is a type of marine insurance. Most ships are chartered either on a time charter or voyage charter contract. In both cases the charterer assumes liabilities towards the shipowner because of damage caused to the ship in the course of cargo-handling or because of damage resulting from an unsafe port or berth. And also, the charterer becomes liable similarly to the shipowner, with P&I liability to cargo, pollution claims and etc. All charterers require cover...

  2. Does Charter Status Determine Preferences? Comparing the Hiring Preferences of Charter and Traditional Public School Principals

    Science.gov (United States)

    Cannata, Marisa; Engel, Mimi

    2012-01-01

    The academic success of any school depends on its teachers. However, relatively little research exists on the qualities principals value in teacher hiring, and we know almost nothing about charter school principals' preferences. This article addresses this gap in the literature using survey results for a matched sample of charter and traditional…

  3. Charter Ranking Roulette: An Analysis of Reports that Grade States' Charter School Laws

    Science.gov (United States)

    Chi, Wendy C.; Welner, Kevin G.

    2008-01-01

    Since 1996, the Center for Education Reform has released an annual report card, grading each state's charter school legislation and labeling as the "strongest" those laws placing the fewest and slightest restrictions on charter schools. While the Center for Education Reform rankings have undoubtedly been the most influential, at least four other…

  4. Explaining the Gap in Charter and Traditional Public School Teacher Turnover Rates

    Science.gov (United States)

    Stuit, David A.; Smith, Thomas M.

    2012-01-01

    This study uses national survey data to examine why charter school teachers are more likely to turnover than their traditional public school counterparts. We test whether the turnover gap is explained by different distributions of factors that are empirically and theoretically linked to turnover risk. We find that the turnover rate of charter…

  5. Planning and Implementing Virtual Charter Schools in Wisconsin: A Case Study

    Science.gov (United States)

    Lee, Juanita Joyce

    2010-01-01

    The long-term concern relative to education inequity indicates that the nation's youth will not be adequately prepared for the global and highly competitive marketplace of the 21st century (Casner-Lotto & Barrington, 2006). Initiatives to address this concern persist, including the creation of the virtual charter school (Vanourek, 2006;…

  6. Determinants of Mammography in Women with Intellectual Disabilities

    OpenAIRE

    Wilkinson, Joanne E.; Lauer, Emily; Freund, Karen M.; Rosen, Amy K

    2011-01-01

    Women with intellectual disabilities have the same rate of breast cancer as other women but are less likely to undergo screening mammography. Characteristics associated with mammography for women with intellectual disabilities in the US are unknown.

  7. Mammography calibration qualities establishment in a Mo- Mo clinical system

    Science.gov (United States)

    Corrêa, E. L.; dos Santos, L. R.; Vivolo, V.; Potiens, M. P. A.

    2016-07-01

    In this study the mammography calibration qualities were established in a clinical mammography system. The objective is to provide the IPEN instruments calibration laboratory with both mammography calibration methods (using a clinical and an industrial system). The results showed a good behavior of mammography equipment, in terms of kVp, PPV and exposure time. The additional filtration of molybdenum is adequate, air-kerma rates were determined and spectra were obtained.

  8. Verification of Victoreen 4000 mammography chamber calibration status

    International Nuclear Information System (INIS)

    Mammography machines are used for early detection of breast cancer. As the primary standardisation with the mammography machine is not possible, it was decided to calibrate the mammography chamber with x-ray beam from a diagnostic machine, in order to verify the calibration factor (CF) quoted in the certificate

  9. Breast dosimetry in clinical mammography

    Science.gov (United States)

    Benevides, Luis Alberto Do Rego

    The objective of this study was show that a clinical dosimetry protocol that utilizes a dosimetric breast phantom series based on population anthropometric measurements can reliably predict the average glandular dose (AGD) imparted to the patient during a routine screening mammogram. In the study, AGD was calculated using entrance skin exposure and dose conversion factors based on fibroglandular content, compressed breast thickness, mammography unit parameters and modifying parameters for homogeneous phantom (phantom factor), compressed breast lateral dimensions (volume factor) and anatomical features (anatomical factor). The protocol proposes the use of a fiber-optic coupled (FOCD) or Metal Oxide Semiconductor Field Effect Transistor (MOSFET) dosimeter to measure the entrance skin exposure at the time of the mammogram without interfering with diagnostic information of the mammogram. The study showed that FOCD had sensitivity with less than 7% energy dependence, linear in all tube current-time product stations, and was reproducible within 2%. FOCD was superior to MOSFET dosimeter in sensitivity, reusability, and reproducibility. The patient fibroglandular content was evaluated using a calibrated modified breast tissue equivalent homogeneous phantom series (BRTES-MOD) designed from anthropomorphic measurements of a screening mammography population and whose elemental composition was referenced to International Commission on Radiation Units and Measurements Report 44 tissues. The patient fibroglandular content, compressed breast thickness along with unit parameters and spectrum half-value layer were used to derive the currently used dose conversion factor (DgN). The study showed that the use of a homogeneous phantom, patient compressed breast lateral dimensions and patient anatomical features can affect AGD by as much as 12%, 3% and 1%, respectively. The protocol was found to be superior to existing methodologies. In addition, the study population anthropometric

  10. A conversion method of air kerma from the primary, scatter, and leakage radiations to effective dose for calculating x-ray shielding barriers in mammography

    International Nuclear Information System (INIS)

    In this study, a new approach has been introduced for derivation of the effective dose from air kerma to calculate shielding requirements in mammography facilities. This new approach has been used to compute the conversion coefficients relating air kerma to the effective dose for the mammography reference beam series of the Netherlands Metrology Institute Van Swinden Laboratorium, National Institute of Standards and Technology, and International Atomic Energy Agency laboratories. The results show that, in all cases, the effective dose in mammography energy range is less than 25% of the incident air kerma for the primary and the scatter radiations and does not exceed 75% for the leakage radiation

  11. 76 FR 4281 - Recreation Resource Advisory Committees Charter Reestablishment

    Science.gov (United States)

    2011-01-25

    ... Forest Service Recreation Resource Advisory Committees Charter Reestablishment AGENCY: Forest Service, USDA. ACTION: Notice of intent to reestablish the Recreation Resource Advisory Committees. SUMMARY: The Secretary of Agriculture intends to reestablish the charter for 5 Forest Service Recreation...

  12. Sustainable development - the ICC business charter

    International Nuclear Information System (INIS)

    The International Chamber of Commerce (ICC) prepared and approved, in November 1990, the ''Business Charter for Sustainable Development; a set of principles for environmental management''. Environmental protection is a necessary part of sustainable development but, too often, the performance of business is seen by society as inadequate. Improved environmental performance is essential if business is to regain public trust, reduce the pressures on governments to over-legislate, and strengthen the business voice in debate on public policy. The Charter has been prepared as a major pro-active business initiative by enterprises around the world. This is timely in view of the extensive international debate on environmental issues and the widespread acceptance of the ''Sustainable Development'' concept. Sustainable development involves meeting the needs of the present without compromising the ability of future generations to meet their own needs. Although the objective of the Charter is that the widest range of enterprises as organizations commit themselves to improving their environmental performance in accordance with the Principles of the Charter, an individual branch of industry may also meet the goals of the Charter. The paper evaluates how the practices implemented in the field of nuclear energy are in harmony with the principles. The conclusion is that nuclear is in the avant garde within the wide spectrum of industrial activities. This conclusion should assist nuclear energy to improve its public acceptance. (author)

  13. IAEA TECDOC 1517 Quality control in mammography software

    International Nuclear Information System (INIS)

    In October 2006, the IAEA published the TECDOC 1517 Quality Control in Mammography, whose main purpose was to give Latin American countries a protocol in Spanish with all necessary QC. This protocol harmonizes the tests and evaluation criteria of mammography equipment and its complementary equipment; it states the different responsibilities on all personnel and gives guidance on radiographic techniques. It was the joint effort of two ARCAL projects: RLA/6/043 and RLA/9/035. QC programs are needed to assure the final quality of mammography images and to optimize the radiation dose to the patients. Countries where national campaigns are used to improve the early detection of breast cancer among asymptomatic women require the establishment of QC programs. Specific software has been developed based on the TECDOC 1517 to facilitate the technologist, medical physicist and physician its implementation. It has a main menu bar tool and icons for rapid access to the different tests. The help option in each test pops a window with the same procedure written on the TECDOC for the user's convenience. The tests are divided on the same sections as in the document: visual inspection, storage of films, dark room, image system, radiological equipment, automatic exposure control, geometry, collimation, image visualization, film rejection analysis, image quality and dosimetry. On each test, data is introduced on specific color cells and when the user activates the calculation button, the results are compared against its tolerance levels, and indication of pass/fail is finally displayed. This software, available to all Member States, adds extra value to the TECDOC 1517 since errors in calculations will be reduced by its use. It will harmonize the way results are presented, it will facilitate comparisons, it reduces the time to evaluate the results of the test and finally it becomes a teaching tool for the TECDOC. (author)

  14. Contrast media in MR mammography

    International Nuclear Information System (INIS)

    A standardized relationship between concentration of contrast media and normalized signal intensity should be the basis of a diagnostic evaluation of MR-mammography at different sites and with different sequences. In this work we compared the dynamic range of the MR-compatible contrast medium MagnevistR at different sequences and machines. For this purpose we made measurements with a phantom, consisting of MR-compatible glass tubes filled with contrast medium of different concentrations. The glass tubes were placed in a water bath. All measurements were made with breast coils. The signal intensity of the glass tubes was normalized to the signal intensity of the native probe (water=1). These normalized dynamic curves were compared with each other in order to find, for the different machines, the sequence which is nearest to be defined 'Standard-Curve'. As this task proved not possible for all machines, we measured how the dynamic curves of the different machines related to the 'Standard-Curve'. For all sequences we made also measurements with a female student to assure the quality of the pictures. Thus the participating radiologists can now compare their dynamic measurements of breast lesions with each other. (orig.)

  15. Doses in mammography. Preliminary study

    International Nuclear Information System (INIS)

    Mammography is the most important method to detect lesions in the breast with this technique one can detect small tumours before clear clinical symptoms appear. Mammographic image of require high quality standards due that the extremely low contrast between the normal and pathological areas in the breast, eg.g., they have similar attenuation and absorption coefficient. The x-ray mammographic systems, used in this study are Senographe 500t and Senographe DMR, a detector with a RadCal ionization chambers calibrated to the qualities of mammographic x-ray beams, and a breast simulator that is a phantoms of polymethylmethacrylate (PMMA) of several thicknesses with the equivalence of 50% of the glandular tissue. The results obtained indicate that the values of doses at the entrance surface of a breast (DES) are greater the reference value 20 mGy to 5,0 cm of PMMA and the values of the mean glandular dose (MGD) exceed the reference value of 2,1 mGy for 5,1 cm of compressed thick breast. We consider that the values high of the EDS and MGD are due that the x-ray systems no meeting in good condition or for used of x-ray spectra no suitable, so is recommendable be carried out test of quality control to the x-ray systems and also realize studies, or characterize the of x-ray mammographic spectra

  16. 41 CFR 105-54.203-2 - Active charters file.

    Science.gov (United States)

    2010-07-01

    ... 41 Public Contracts and Property Management 3 2010-07-01 2010-07-01 false Active charters file. 105-54.203-2 Section 105-54.203-2 Public Contracts and Property Management Federal Property Management... charters file. The GSA Committee Management Officer retains each original signed charter in a file...

  17. Charter Schools in Indiana: Overview, Funding, and Federal Expenditures

    Science.gov (United States)

    Plucker, Jonathan A.; Eckes, Suzanne; Chang, Young; Benton, Sarah; Trotter, Anne; Bradford, Matthew

    2005-01-01

    This report presents an overview defining what constitutes a charter school and how the existing 22 charter schools in Indiana are funded. 36 charter schools have been approved in Indiana as of Spring 2005. Of these, 22 schools have already begun operating, 10 are slated to open in the coming years, 2 have been closed down before they opened, and…

  18. Equity Overlooked: Charter Schools and Civil Rights Policy

    Science.gov (United States)

    Frankenberg, Erica; Siegel-Hawley, Genevieve

    2009-01-01

    The Civil Rights Project (CRP) is in the midst of an analysis of rapidly growing charter school enrollment, which the authors anticipate releasing next month. Similar to trends described in their 2003 report and in other research on racial isolation in charter schools, they find higher levels of segregation for black students in charter schools…

  19. Charter Management Organizations: Innovations, Opportunities, and Challenges. Research Brief

    Science.gov (United States)

    Center on Reinventing Public Education, 2010

    2010-01-01

    Over the past two decades, charter management organizations (CMOs) have become a significant force in the public K-12 charter school landscape. CMOs, nonprofit entities that directly manage public charter schools, are meant to meld the benefits of school districts--including economies of scale, collaboration among similar schools, and support…

  20. Charter School Autonomy: The Mismatch between Theory and Practice

    Science.gov (United States)

    Finnigan, Kara S.

    2007-01-01

    In theory, the charter school concept is based on a trade-off or exchange: greater autonomy for increased accountability. Although charter schools have been operating for more than 10 years, little is known about charter school autonomy in practice. This mixed-methods study used survey and case study data to examine the degree of autonomy of…

  1. Not Just Urban Policy: Suburbs, Segregation, and Charter Schools

    Science.gov (United States)

    Frankenberg, Erica; Siegel-Hawley, Genevieve

    2012-01-01

    As the charter school sector expands rapidly with federal support amid on-going diversification and growing segregation among traditional public school students, this article examines existing patterns of segregation in charter schools. Prior research has demonstrated that charter schools are substantially more segregated than our already…

  2. The Relative Efficiency of Charter Schools: A Cost Frontier Approach

    Science.gov (United States)

    Gronberg, Timothy J.; Jansen, Dennis W.; Taylor, Lori L.

    2012-01-01

    Charters represent an expansion of public school choice, offering free, publicly funded educational alternatives to traditional public schools. One relatively unexplored research question concerning charter schools asks whether charter schools are more efficient suppliers of educational services than are traditional public schools. The potential…

  3. Quality control tests for conventional mammography

    International Nuclear Information System (INIS)

    Mammography is this the test that allows the radiologist to look at images of the inside of the breasts. Mammograms help detect breast cancer early successful treatment of breast cancer depends on that early diagnosis. Breast cancer is a very common condition. About one in every nine women develops breast cancer by the age of eighty. In addition to the clinical examination and self-examination, mammography plays important role in the detection of breast cancer before they become clinically visible tumors. The mammography is the most common test for early detection of breast cancer. Quality control techniques that done ensured importance of this programme to produce images with good diagnostic values and help radiologist to diagnose breast discase easily and avoid exposing patient to radiation hazards.(Author)

  4. Radiation risk for women undergoing mammography examinations

    International Nuclear Information System (INIS)

    Full text of publication follows: Introduction: The application of X-rays in mammography examinations requires not only constant control of physical and technical parameters of the equipment used, but also an evaluation of the radiation risk for patients, particularly in mammography screening programs. There exist a number of methods of dose evaluation in mammography. Some of them are included in the dosimetry protocols. The tolerances for measured values, limiting the dose to the patients have also been established. One of the methods, proposed by Dance, applies to establishing the doses to individual patients. It requires the knowledge clinical and exposition parameters. Another method, recommended by the E.C., requires establishing the phantom dose for reference exposition, as part of quality control tests. This approach is simpler but less precise, because at most mammography facilities the conditions of reference exposition are different than those of routine clinical exposition as it was shown in an exercise of quality control tests in a group of 32 mammography facilities in Poland. The method proposed in this study is an intermediate solution recommending measurement of phantom dose for the routine clinical exposition. Material and Methods: The material contains the data of 230 expositions performed in 6 mammography facilities Poland. This data was used to establish individual dose for ever y patient undergoing mammography examination according to the method proposed by Dance. For each mammography facility the mean glandular dose (M.G.D. F.) was established for reference and routine expositions according to the E.C. Dosimetry Protocol. The limits for phantom dose were established, which, according to the E.C. protocol, depend on the optical density (over background) of the image of the PMMA phantom 4.5 cm thick. Results and Discussion: The phantom dose determined for each mammography facility were below the limits. The lowest value of the mean dose received

  5. Texas charter school legislation and the evolution of open-enrollment charter schools.

    Directory of Open Access Journals (Sweden)

    Carrie Y. Barron Ausbrooks

    2005-03-01

    Full Text Available This article chronicles the evolution of legislation for Texas open-enrollment charter schools to their implementation by demonstrating how these schools have (or have not used their freedom from state-mandated requirements to develop innovative learning environments as well as to bring innovative curricula into the classroom. The investigative focus was on an analysis of Texas open-enrollment charter school legislation, from 1995 (74th legislative session to the 77th legislative session in 2001, and the characteristics of the state's 159 open-enrollment charter schools that were in operation during the 2001-2002 academic year. The authors found that charter school legislation has changed in response to concerns of all involved, and focuses on the need for balance between choice, innovation, and public accountability. Although charter schools are free from most state regulations, legislators were clearly interested in ensuring that this freedom does not impede charter schools' ability to provide a quality education to all students who attend them. The currently operating open-enrollment charter schools in Texas are more racially and economically segregated than other public schools in the state, and charter schools that targeted students most at risk for dropping out of school (and returning students who had previously dropped out differ from other schools in their stated teaching methods. Teacher turnover remains significantly greater than that for other public schools in the state. However, it does not appear to be specifically associated with schools that target disadvantaged students or minority students. The schools' mission statements suggest that innovative school environments are a factor in school design. Texas is poised to continue along the public education choice model. Charter school legislation provides a framework upon which charter schools may build to meet the educational needs of the students who choose to attend them

  6. Yacht charter in Portugal- developing a business model for a sailing charter company

    OpenAIRE

    Kalcic, Natasa

    2016-01-01

    Given the signals that Portugal can be a great destination for charter sailing, the purpose of this work is to disprove this. Thereby the model of Porter’s five forces has been used to analyze the Portuguese yacht charter market, whereas a SWOT analysis should give an overview and compare the Portuguese market with the well running charter market of Croatia. The research outcome on the supply side as well as on the demand side should then serve as a foundation for establishing a ...

  7. Disaster response and the international charter program

    Science.gov (United States)

    Stryker, Timothy; Jones, Brenda

    2009-01-01

    In a meeting held in Vienna, Austria in 1999, a small group of space agencies conceived and approved a program to provide emergency response satellite data to those affected by disasters anywhere in the world. The purpose of this group, which came to be known as the “International Charter - Space and Major Disasters”, is to promote cooperation among space agencies in the use of satellite data to manage crises during and after disasters. When tropical storms, floods, oil spills, earthquakes, landslides, volcanoes or fires endanger human life, the Charter member agencies provide valuable information about these events’ extent and impact.

  8. Investigating Leadership in Charter Schools: An Examination of the Leadership Traits of Executive Directors in Successful Charter Schools

    Science.gov (United States)

    Bloomfield, Brian D.

    2013-01-01

    This study was a qualitative exploration of educational leadership within charter schools in an attempt to identify traits demonstrated by executive directors of successful charter schools. Because much research has been conducted to identify trends in educational leadership, but comparable little within the unique context of charter schools, and…

  9. Mammography screening. Benefits, harms, and informed choice

    DEFF Research Database (Denmark)

    Jørgensen, Karsten Juhl

    2013-01-01

    The rationale for breast cancer screening with mammography is deceptively simple: catch it early and reduce mortality from the disease and the need for mastectomies. But breast cancer is a complex problem, and complex problems rarely have simple solutions. Breast screening brings forward the time...... the justification of breast screening is therefore not a simple question of whether screening reduces breast cancer mortality. This dissertation quantifies the primary benefits and harms of screening mammography. Denmark has an unscreened "control group" because only two geographical regions offered screening over...

  10. Mammography activity in Norway 1983 to 2008

    DEFF Research Database (Denmark)

    Lynge, Elsebeth; Braaten, Tonje; Njor, Sisse H;

    2011-01-01

    In Norway, an organized screening mammography program, the Norwegian Breast Cancer Screening Program (NBCSP) started in four counties in 1996 and became nationwide in 2004. We collected data on pre-program screening activity, and in view of this activity we evaluated the potential impact of the p......In Norway, an organized screening mammography program, the Norwegian Breast Cancer Screening Program (NBCSP) started in four counties in 1996 and became nationwide in 2004. We collected data on pre-program screening activity, and in view of this activity we evaluated the potential impact...

  11. Mammography. State-of-the-art

    International Nuclear Information System (INIS)

    In recent years, the criticism of mammography as a diagnostic and/or survey procedure has decreased, primarily due to the perception that there has been an increase in quality and a concomitant decrease in risk. A review of the physical changes in mammographic equipment, the characteristics of current image receptors and dosimetry indicates that this assumption is correct. The results of the examination of 280,000 women from the Breast Cancer Detection Demonstration Project centers also support this conclusion. When all factors are considered it is reasonable to conclude that the potential benefits of mammography far outweigh the minimal risk incurred by the examination

  12. Measurement of glanduler tissue dose and image quality on mammography investigation at different exposure parameters and systems

    International Nuclear Information System (INIS)

    There are many protocols suggested different international organization regarding to routine quality control and acceptance test methods of mammography systems. Users may select the most appropriate method for their routine practices according to infrastructure they have. However if there is a need for national authority to establish protocol for licesing of invidual users or in case of a screening studies for a large populations. Use of standard protocol became is important. Currently, there are more than 550 mamography system use in Turkey. However users implementing neither quality controlnor acceptance on the other hand even the national authorities. The purpose this thesis is to establishment a standard protocol than can be used for quality control and routine tests on mammography systems. This procedures were implented for 18 different mammography systems instoled at different places in Ankara

  13. Fields of application of the Charter of Fundamental Rights and constitutional dialogues in the European Union

    OpenAIRE

    SAFJAN, Marek

    2014-01-01

    This article is an extended version of a speech delivered during the Conference on Judicial Cooperation Techniques for the Protection of European Fundamental Rights: Past and Future Prospectives held in EUI on 9-10 May 2014. It deals with the possibility of maintaining coexisting national and Charter standards of fundamental rights and with the importance of cooperation between the ECJ and the national courts when fundamental rights protection is at stake. In this article, possible approaches...

  14. Texas charter school legislation and the evolution of open-enrollment charter schools.

    OpenAIRE

    Carrie Y. Barron Ausbrooks; Edith J. Barrett; Theresa Daniel

    2005-01-01

    This article chronicles the evolution of legislation for Texas open-enrollment charter schools to their implementation by demonstrating how these schools have (or have not) used their freedom from state-mandated requirements to develop innovative learning environments as well as to bring innovative curricula into the classroom. The investigative focus was on an analysis of Texas open-enrollment charter school legislation, from 1995 (74th legislative session) to the 77th legislative session in...

  15. Why Do Charter Schools Fail? - An Analysis of Charter School Survival in New Jersey

    OpenAIRE

    Julia Schwenkenberg; James VanderHoff

    2013-01-01

    The reasons for charter school failure may determine if charter school competition improves public education. We estimate survival regressions to assess the effects of various factors on the probability of school failure. We find that students’ test scores are the most important determinant of survival: a one standard deviation increase reduces the probability of failure by at least 72%. Higher expenditures on facilities and a longer waitlist result in smaller but significant reductions in th...

  16. Optimization of exposure parameters in full field digital mammography using figure of merit

    International Nuclear Information System (INIS)

    Mammography is used as a screening tool for early detection of breast cancer. However, the radiation dose used should be as low as possible to minimize any effects on asymptomatic woman while maintaining the diagnostic value of the image as mammography is done annually. This study was done to determine the optimum exposure parameter in exposure control mode (AEC) for two combinations of anode/ filter which were molybdenum/ molybdenum (Mo/ Mo) and molybdenum/ rhodium (Mo/ Rh) using the Lorad Selenia digital mammography system at the Women's Breast Clinic, National Cancer Society (NCS). A CIRS012A mammography research of phantom 4 cm thickness with 50 % glandularity was exposed in the cranio-caudal projection. TLD 100H was used to measure the entrance surface air kerma (ESAK). The AGD values were then calculated from the ESAK values, incorporating three correction factors (g, c and s) according to Euref protocol. Image quality was evaluated using signal to noise ratio (SNR). Figure of Merit (FOM) which is the ratio of the square of SNR to the AGD shows that 30 kVp is the optimum exposure parameter for a 4 cm thickness phantom with the use of Mo/ Rh and Mo/ Mo anode/ filter combination. Non-parametric Spearman correlation test showed a negative linear relationship between AGD and SNR with increasing tube voltage for both anode/ filters. (author)

  17. Optimisation of X-ray examinations in Lithuania: Start of implementation in mammography

    International Nuclear Information System (INIS)

    Optimisation of medical X-ray examinations is very important for the enhancement of the reliability of the examination and for the reduction of the radiation dose to patients. Results of investigations of doses to patients during mammography using thermoluminescence dosemeters at different hospitals are presented together with a brief overview of the situation for mammography in Lithuania. It is shown that the entrance surface air kerma varies in a broad range and differed from hospital to hospital. Nevertheless the calculated values of average glandular dose (AGD) for a 'standard' breast being relatively high were comparable with those (3.2 mGy per exposure at net optical density 1.4) currently accepted by international authorities. Differences in AGD values evaluated at different hospitals demonstrate the existing potential for optimisation of the mammography screening procedures. The results of this investigation will be included in a database for patient doses in Lithuania and used for establishing a national reference dose level for mammography. Currently, reference levels recommended by international authorities are used in Lithuania. (authors)

  18. Improving Dispute Resolution: Student Contracts and Charters

    Science.gov (United States)

    Evans, G. R.

    2011-01-01

    The sector is entering a climate of future funding cuts and fee rises, which are likely to prompt a growing number and widening range of disputes. This article describes the launch of a new Improving Dispute Resolution Advisory Service. The particular questions raised in this context by the introduction of student charters and the relationship of…

  19. 78 FR 5239 - Public Charter Prospectuses

    Science.gov (United States)

    2013-01-24

    .... These revisions refer to a notice dated November 13, 2012, appearing at 77 FR 69692 (Nov. 20, 2012). FOR... Federal Register (77 FR 69692 (Nov. 20, 2012)), the notice was also posted at www.regulations.gov and on... that we would not permit the charter operator to accept payment by debit card (although we did...

  20. Addendum: Parker Charter Essential School's Wellness Program

    Science.gov (United States)

    Horace, 2008

    2008-01-01

    Wellness is an integrated curriculum combining aspects of traditional health classes with physical education, games, fitness skills and other mind-body connection skills. The goals of Parker Charter Essential School's Wellness program developed by members of the Parker community are: (1) to develop and nurture resilience; (2) to foster and promote…

  1. Exploring the Competitive Effects of Charter Schools

    Science.gov (United States)

    Carpenter, Dick M., II; Medina, Paul M.

    2011-01-01

    Central to the debate over school choice has been the question of how public schools respond to market-based competition. Many choice advocates suggest that competition can spur public schools to become more effective and efficient, but the evidence regarding the effect of competition from charters is comparably sparse and mixed. This article…

  2. 44 CFR 12.7 - Charter.

    Science.gov (United States)

    2010-10-01

    ... 44 Emergency Management and Assistance 1 2010-10-01 2010-10-01 false Charter. 12.7 Section 12.7 Emergency Management and Assistance FEDERAL EMERGENCY MANAGEMENT AGENCY, DEPARTMENT OF HOMELAND SECURITY... also be furnished at the time of filing to the Library of Congress, Exchange and Gift Division,...

  3. Charter School Innovations: A Teacher Growth Model

    Science.gov (United States)

    Radoslovich, Julie; Roberts, Shelley; Plaza, Andres

    2014-01-01

    Committed to being a charter school with a professional learning community that empowers teachers, New Mexico's South Valley Academy (SVA) staff transformed its state evaluation process into a practitioner action research process (Anderson, Herr, & Nihlen, 2007). While teachers self-diagnose growth needs and play active roles in improving…

  4. Measuring Charter School Efficiency: An Early Appraisal

    Science.gov (United States)

    Carpenter, Dick M., II; Noller, Scott L.

    2010-01-01

    In an era of increased accountability and challenging times for public finance, charter schools built on decentralization, grassroots accountability, and market forces may provide, in the spirit of "educational laboratories," lessons for increasing student achievement more efficiently through diverse and innovative management, organization,…

  5. 12 CFR 552.4 - Charter amendments.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 5 2010-01-01 2010-01-01 false Charter amendments. 552.4 Section 552.4 Banks and Banking OFFICE OF THRIFT SUPERVISION, DEPARTMENT OF THE TREASURY FEDERAL STOCK ASSOCIATIONS..., to the holders of the outstanding shares of any class of stock having preference over the...

  6. Classification of findings in mammography screening

    DEFF Research Database (Denmark)

    Pamilo, M; Lönnqvist, J; Halttunen, A;

    1991-01-01

    survey of mammography screening in Helsinki and surroundings in Finland. PATIENTS--21,417 women (aged 50-59 years) were invited to be screened, 18,012 (84.10%) participated. Of these 579 (3.21% of those screened) were recalled for further studies; 124 of these were referred for surgical biopsy and 82 had...

  7. [Fine needle aspiration cytology of mammography screening

    DEFF Research Database (Denmark)

    Engvad, B.; Laenkholm, A.V.; Schwartz, Thue W.;

    2009-01-01

    -choice treatment. MATERIAL AND METHODS: 767 women had FNAC performed from a total of 783 lesions at the Mammography Clinic, University Hospital Odense. All FNACs were compared with the final histology diagnosis. Nine statistical parameters were calculated according to the European guidelines. RESULTS: A total...

  8. Physical methods for dose determinations in mammography

    International Nuclear Information System (INIS)

    There is small but significant risk of radiation induced carcinogenesis associated with mammography. High quality mammography is the best method of early breast cancer detection. Besides, image as a basic requirement for an effective diagnosis, radiation protection principles require the radiation dose to the imaged tissue to be as low as compatible with required image quality. Glandular tissues is the most radiosensitive, thus the evaluation of Mean Glandular Dose (MGD) is the most relevant factor for estimation of radiation risk as well as the comparison of performance at different mammographic machines. MGD was estimated using Entrance Surface Air KERMA at the breast surface Kf measured free in air and appropriate conversation factors. Under evaluation were eight mammographic machines at institute of radiology, Skopje and mammographic machines at the Health's centers in Vevchani, Bitola, Prilep, Negotino and Shtip. Estimated values of MGD do not exceed the European reference level (<2mGy), but it can not be generally concluded for all mammography units in Macedonia, until their examination. In the near future all mammography units will be subject of Q C tests and dose measurements. (Author)

  9. Mammography: reviewing the evidence. Epidemiology aspect.

    OpenAIRE

    Miller, A B

    1993-01-01

    The role of mammography as a screening test for breast cancer is still being evaluated. Screening does not seem to reduce breast cancer mortality in women age 40 to 49. However, for women age 50 to 69, a 40% reduction in breast cancer mortality can be anticipated after 5 years, providing high compliance to screening is obtained.

  10. Physical measures of image quality in mammography

    Science.gov (United States)

    Chakraborty, Dev P.

    1996-04-01

    A recently introduced method for quantitative analysis of images of the American College of Radiology (ACR) mammography accreditation phantom has been extended to include signal- to-noise-ratio (SNR) measurements, and has been applied to survey the image quality of 54 mammography machines from 17 hospitals. Participants sent us phantom images to be evaluated for each mammography machine at their hospital. Each phantom was loaned to us for obtaining images of the wax insert plate on a reference machine at our institution. The images were digitized and analyzed to yield indices that quantified the image quality of the machines precisely. We have developed methods for normalizing for the variation of the individual speck sizes between different ACR phantoms, for the variation of the speck sizes within a microcalcification group, and for variations in overall speeds of the mammography systems. In terms of the microcalcification SNR, the variability of the x-ray machines was 40.5% when no allowance was made for phantom or mAs variations. This dropped to 17.1% when phantom variability was accounted for, and to 12.7% when mAs variability was also allowed for. Our work shows the feasibility of practical, low-cost, objective and accurate evaluations, as a useful adjunct to the present ACR method.

  11. Thermoluminescence dosimetry in quality imaging in CR mammography systems

    International Nuclear Information System (INIS)

    The aim of this work is to estimate the average glandular dose with Thermoluminescence Dosimetry (TLD) and comparison with quality imaging in CR mammography. For measuring dose, FDA and ACR use a phantom, so that dose and image quality are assessed with the same test object. The mammography is a radiological image to visualize early biological manifestations of breast cancer. Digital systems have two types of image-capturing devices, Full Field Digital Mammography (FFDM) and CR mammography. In Mexico, there are several CR mammography systems in clinical use, but only one CR mammography system has been approved for use by the FDA. Mammography CR uses a photostimulable phosphor detector (PSP) system. Most CR plates are made of 85% BaFBr and 15% BaFI doped with europium (Eu) commonly called barium fluoro halide. We carry out an exploratory survey of six CR mammography units from three different manufacturers and six dedicated x-ray mammography units with fully automatic exposure. The results show three CR mammography units (50%) have a dose that overcomes 3.0 mGy and it doesn't improve the image quality and dose to the breast will be excessive. The differences between doses averages from TLD system and dosimeter with ionization chamber are less than 10%. TLD system is a good option for average glandular dose measurement. (Author)

  12. Thermoluminescence dosimetry in quality imaging in CR mammography systems

    Energy Technology Data Exchange (ETDEWEB)

    Gaona, E.; Franco E, J.G. [UAM-Xochimilco, 04960 Mexico D.F. (Mexico); Azorin N, J. [UAM-Iztapalapa, 09340 Mexico D.F. (Mexico); Diaz G, J.A.I. [CICATA, Unidad Legaria, Av. Legaria 694, 11599 mexico D.F. (Mexico); Arreola, M. [Department of Radiology, Shands Hospital at UF, PO Box 100374, Gainesville, FL 32610-0374 (United States)

    2006-07-01

    The aim of this work is to estimate the average glandular dose with Thermoluminescence Dosimetry (TLD) and comparison with quality imaging in CR mammography. For measuring dose, FDA and ACR use a phantom, so that dose and image quality are assessed with the same test object. The mammography is a radiological image to visualize early biological manifestations of breast cancer. Digital systems have two types of image-capturing devices, Full Field Digital Mammography (FFDM) and CR mammography. In Mexico, there are several CR mammography systems in clinical use, but only one CR mammography system has been approved for use by the FDA. Mammography CR uses a photostimulable phosphor detector (PSP) system. Most CR plates are made of 85% BaFBr and 15% BaFI doped with europium (Eu) commonly called barium fluoro halide. We carry out an exploratory survey of six CR mammography units from three different manufacturers and six dedicated x-ray mammography units with fully automatic exposure. The results show three CR mammography units (50%) have a dose that overcomes 3.0 mGy and it doesn't improve the image quality and dose to the breast will be excessive. The differences between doses averages from TLD system and dosimeter with ionization chamber are less than 10%. TLD system is a good option for average glandular dose measurement. (Author)

  13. 2D vs. 3D mammography observer study

    Science.gov (United States)

    Fernandez, James Reza F.; Hovanessian-Larsen, Linda; Liu, Brent

    2011-03-01

    Breast cancer is the most common type of non-skin cancer in women. 2D mammography is a screening tool to aid in the early detection of breast cancer, but has diagnostic limitations of overlapping tissues, especially in dense breasts. 3D mammography has the potential to improve detection outcomes by increasing specificity, and a new 3D screening tool with a 3D display for mammography aims to improve performance and efficiency as compared to 2D mammography. An observer study using a mammography phantom was performed to compare traditional 2D mammography with this ne 3D mammography technique. In comparing 3D and 2D mammography there was no difference in calcification detection, and mass detection was better in 2D as compared to 3D. There was a significant decrease in reading time for masses, calcifications, and normals in 3D compared to 2D, however, as well as more favorable confidence levels in reading normal cases. Given the limitations of the mammography phantom used, however, a clearer picture in comparing 3D and 2D mammography may be better acquired with the incorporation of human studies in the future.

  14. Computer-aided diagnosis in routine mammography

    International Nuclear Information System (INIS)

    Purpose: Computer-aided diagnosis in mammography is a topic many study groups have been concerned with since the first presentation of a system for computer-aided interpretation in 1967. Currently, there is only one system avilable for clinical use in mammography, the CAD-System Image Checker (R2 Technology). The purpose of our prospective study was to evaluate whether the integration of the CAD-system into the routine of a radiological breast diagnosis unit is feasible. Results: After the installation of the CAD-system, 300 patients with 1110 mammograms were included for evaluation in the present study. In 54 of these cases histological examination was indicated due to suspect criteria on conventional mammography. In 39 of 54 cases (72,2%) malignancy could be proven histologically. The CAD-system marked 82,1% of the histologically verified carcinomas correctly 94,3% of all 1797 marks made by the CAD-system indicated normal or benign structures. Routinely performed CAD analysis prolonged patients waiting time by about 15 min because the marks of the CAD system had to be interpreted in addition to the routine diagnostic investigations. Conclusion: Our experience with the use of the CAD-system in daily routine showed that CAD analysis can easily be integrated into a preexisting mammography unit. However, the diagnostic benefit is not yet clearly established. Since the rate of false negative marks by the CAD-system Image Checker is still high, the results of CAD analysis must be checked and corrected by an observer well experienced in mammography reading. (orig.)

  15. Analysis of medical exposures in digital mammography

    International Nuclear Information System (INIS)

    Currently, the use of digital mammography in the early diagnosis of breast cancer is increasingly common due to the production of high definition image that allows to detect subtle changes in breast images profiles. However it is necessary to be an improvement of the technique used since some devices offer minimization parameters of entrance dose to the skin. Thus, this study seeks to examine how the qualification of technical professionals in radiology interferes with the use of the techniques applied in mammography. For this, survey was carried out in a hospital in the city of Rio de Janeiro, which evaluated the scans of 1190 patients undergoing routine mammography (It is considered routinely the 4 basic exhibitions: with 2 flow skull and 2 medium oblique side, excluding repeats and supplements) in 2013. The medical exposures analyzed obtained from a single full digital equipment, model Senographe DS were compared with three different procedures performed by professionals in mammography techniques. The images were classified according to exposure techniques available in the equipment: Standard (STD), contrast (CNT) and dose (dose), and to be selected as breast density of the patient. Comparing the variation of the radiographic technique in relation to the professional who made the exhibition, what is observed is that the professional B presented the best conduct in relation to radiological protection, because she considered breast density in the choice of technical equipment parameter. The professional A, which is newly formed, and C, which has more service time, almost did not perform variations in the pattern of exposure, even for different breast densities. Thus, we can conclude that there is a need to update the professionals so that the tools available of dose limitation and mamas variability to digital mammography are efficiently employed in the service routine and thus meet the requirements of current legislation

  16. Radiology Residents' Performance in Screening Mammography Interpretation

    International Nuclear Information System (INIS)

    To evaluate radiology residents' performance in screening mammography interpretation and to analyze the factors affecting performance. We enrolled 203 residents from 21 institutions and performed mammography interpretation tests. Between the trainee and non-trainee groups, we compared the interpretation score, recall rate, sensitivity, positive predictive value (PPV) and false-positive rate (FPR). We estimated the training effect using the score differences between trainee and non-trainee groups. We analyzed the factors affecting performance between training-effective and non-effective groups. Trainees were superior to non-trainees regarding interpretation score (43.1 vs. 37.1), recall rate (11.0 vs. 15.5%), sensitivity (83.6 vs. 72.0%), PPV (53.0 vs. 32.4%) and FPR (13.5 vs. 25.5). The longer the training period, the better were the interpretation score, recall rate, sensitivity, PPV and FPR (rho = 0.486, -0.375, 0.343, 0.504, -0.446, respectively). The training affected an increase by an average of 6 points; however, 31.6% of institutions showed no effect. A difference was noted in the volume of mammography interpretation during a month (594.0 vs. 476.9) and dedication of breast staff (61.5 vs. 0%) between training-effective and non-effective groups. Trainees showed better performance in mammography interpretation compared to non-trainees. Moreover, performance was correlated with the training period. The factors affecting performance were the volume of mammography interpretation and the dedication of the breast staff.

  17. Development of techniques and methods for evaluation of quality of scanned image in mammography

    International Nuclear Information System (INIS)

    Cancer is the second cause of death in the Brazilian female population and breast cancer is the most frequent neoplasm amongst women. Mammography is an essential tool for diagnosis and early detection of this disease. In order to be effective, the mammography must be of good quality. The Brazilian College of Radiology (CBR), the National Agency for Health Surveillance (ANVISA) and international bodies recommend standards of practice for mammography. Due to the risk of ionizing radiation, techniques that minimize dose and optimize image quality are essential to ensure that all women are submitted to mammography procedures of high quality for the detection of breast cancer. In this research were analyzed components of the image treatment via digital and developed methods and techniques of analysis aiming the detection of structures for medical diagnosis, decreasing variations due to subjectivity. It used free software Image J, to make the evaluations of the information contained in the scanned images. We use the scanned images of calibration of a simulated breast to calibrate the program Image J. Thus, it was able to correctly convert the values of the scale of shades of gray in optical density values of presenting the standard deviation for each measure held. Applying the test t-student noticed that the values obtained with the digital system to the level of contrast and spatial resolution are consistent with the results obtained so subjective, since there was no significant difference (p <0.05) for all comparisons evaluated. Since then, this methodology is recommended in routine evaluations of services of mammography. (author)

  18. Mammography-oncogenecity at low doses

    International Nuclear Information System (INIS)

    Controversy exists regarding the biological effectiveness of low energy x-rays used for mammography breast screening. Recent radiobiology studies have provided compelling evidence that these low energy x-rays may be 4.42 ± 2.02 times more effective in causing mutational damage than higher energy x-rays. These data include a study involving in vitro irradiation of a human cell line using a mammography x-ray source and a high energy source which matches the spectrum of radiation observed in survivors from the Hiroshima atomic bomb. Current radiation risk estimates rely heavily on data from the atomic bomb survivors, and a direct comparison between the diagnostic energies used in the UK breast screening programme and those used for risk estimates can now be made. Evidence highlighting the increase in relative biological effectiveness (RBE) of mammography x-rays to a range of x-ray energies implies that the risks of radiation-induced breast cancers for mammography x-rays are potentially underestimated by a factor of four. A pooled analysis of three measurements gives a maximal RBE (for malignant transformation of human cells in vitro) of 4.02 ± 0.72 for 29 kVp (peak accelerating voltage) x-rays compared to high energy electrons and higher energy x-rays. For the majority of women in the UK NHS breast screening programme, it is shown that the benefit safely exceeds the risk of possible cancer induction even when this higher biological effectiveness factor is applied. The risk/benefit analysis, however, implies the need for caution for women screened under the age of 50, and particularly for those with a family history (and therefore a likely genetic susceptibility) of breast cancer. In vitro radiobiological data are generally acquired at high doses, and there are different extrapolation mechanisms to the low doses seen clinically. Recent low dose in vitro data have indicated a potential suppressive effect at very low dose rates and doses. Whilst mammography is a low

  19. Obesity and Mammography: A Systematic Review and Meta-Analysis

    OpenAIRE

    Maruthur, Nisa M.; Bolen, Shari; Brancati, Frederick L.; Clark, Jeanne M.

    2009-01-01

    BACKGROUND Obese women experience higher postmenopausal breast cancer risk, morbidity, and mortality and may be less likely to undergo mammography. OBJECTIVES To quantify the relationship between body weight and mammography in white and black women. DATA SOURCES AND REVIEW METHODS We identified original articles evaluating the relationship between weight and mammography in the United States through electronic and manual searching using terms for breast cancer screening, breast cancer, and bod...

  20. Perspectives of the digital mammography platform; Perspektiven der digitalen Mammographieplattform

    Energy Technology Data Exchange (ETDEWEB)

    Gruber, R.; Riedl, C.C.; Reisegger, M.; Pinker, K.; Sturm, E.; Semturs, F.; Helbich, T.H. [Medizinische Universitaet Wien, Abteilung fuer Allgemeine Radiologie und Kinderradiologie, Division fuer Molekulare und Gender-Bildgebung, Universitaetsklinik fuer Radiodiagnostik, Wien (Austria)

    2010-11-15

    In Europe one out of every nine women suffers from breast cancer during her lifetime. Since the introduction of mammography screening programs more breast cancers are being diagnosed when they are still small and early stage cancers with a favourable prognosis. The introduction of digital mammography systems has led to a continuous reduction of breast cancer mortality especially in specific patient subgroups. Furthermore, the digital mammography platform enables the development of new, innovative breast imaging methods to increase sensitivity and decrease breast cancer mortality. This digital mammography platform includes digital breast tomosynthesis, digital contrast medium mammography and digital contrast medium breast tomosynthesis as well as fused data sets from digital mammography with ultrasound or MRI. The following article summarizes these new applications, describes the strengths of the digital platform and illustrates the potential advantages of an improved breast cancer diagnosis by digital mammography. (orig.) [German] Etwa jede neunte Frau in Europa erkrankt im Laufe ihres Lebens an Brustkrebs. Durch die Einfuehrung von Mammographiescreeningprogrammen werden immer mehr kleine Brustkarzinome in einem fruehen Stadium entdeckt. Die Einfuehrung der digitalen Mammographie erzielt insbesondere bei bestimmten Patientinnengruppen eine weitere kontinuierliche Senkung der Brustkrebsmortalitaet. Zusaetzlich ermoeglicht die digitale Mammographie die Entwicklung neuer und Fusion bereits existierender bildgebender Methoden. Zu dieser ''digitalen Mammographieplattform'' gehoeren die digitale Brusttomosynthese, die digitale Kontrastmittelmammographie und die digitale Kontrastmittel-Brusttomosynthese sowie fusionierte Datensaetze der digitalen Mammographie mit dem Ultraschall oder der MRT. Diese innovativen Techniken bieten die Moeglichkeit, die Sensitivitaet der Mammographie zu steigern und die Brustkrebsmortalitaet weiter zu senken. Der folgende

  1. Screening mammography interpretation test: more frequent mistakes

    International Nuclear Information System (INIS)

    Purpose: To present the mammographic cases most commonly misinterpreted by the participants in the mammography self-test proposed by the Italian Society of Medical Radiology (SIRM) National Congress in Rimini, Italy, 2002, by analysing the findings responsible for errors, suggesting reasons for the errors, and assessing possible inadequacies in the format of the test. Materials and methods: The self-test was performed on the mammograms of 160 cases (32 positive and 128 negative for cancer as confirmed by histology). The mammograms had been taken in the four standard projections and placed on four multi-panel diaphanoscopes, each displaying a set of 40 cases comprising benign and malignant cases in equal proportions. The participants were given pre-printed forms on which to note down their diagnostic judgement. We evaluated a total of 134 fully-completed forms. Among these, we identified the 23 cases most frequently misread by over 15 participants in percentages varying between 40-90%. Of these cases, 10 were malignancies and 13 were negative mammograms. On review, we also assessed the diagnostic contribution of complementary investigations (not available the participants). The 134 fully-completed forms (all of the 40 cases) yielded a total of 5360 responses, 1180 of which (22.01%) were incorrect. Of these 823 out of the 4288 cases expected to be negative (19.2%) were false positive, and 357 out of the 1072 cases expected to be positive (33.3%) were false negative. As regards the 23 most frequently misread cases, these were 10/32 (31.25%) mammograms positive for malignancy and 13/128 (10.15%) negative mammograms or mammograms showing benign disease. The 10 malignancies included 7 infiltrating ductal carcinomas, 1 infiltrating cribriform carcinoma, 1 infiltrating tubular carcinoma, and 1 carcinoma in situ. The 13 cases of benign disease - as established by histology or long-term follow-up - mistaken for malignancies by the test participants were fibrocystic breast

  2. Psychosocial predictors of first attendance for organised mammography screening

    DEFF Research Database (Denmark)

    Aro, A R; de Koning, H J; Absetz, P;

    1999-01-01

    not had a mass mammogram recently, but who regularly visited gynaecologists, attended for Pap smear screening, practised breast self examination, and who did not smoke. Low confidence in their own capabilities in breast cancer prevention, overoptimism about the sensitivity of mammography, and perception...... of breast cancer risk as moderate were also predictive of attendance. Expectation of pain at mammography was predictive of non-attendance. CONCLUSION: Mammography screening organised as a public health service was well accepted. A recent mammogram, high reliance on self control of breast cancer......, and an expectation of pain at mammography deterred attendance at screening. Further information about these factors and health information on screening are needed....

  3. Technical Quality of Mammography in Slovenia 1995-2000

    International Nuclear Information System (INIS)

    Full text: In the last few years the number of mammography X-ray examinations in Slovenia has rapidly increased. As mammography is technically one of the most demanding radiographic technique, image quality critically depends on the equipment and its performance, as well as on skill of technicians who employ it. The paper presents the statistics of the most important technical parameters of the mammography systems and the results of a quality control performed in the period from 1995 to 1998. The results clearly show the increased quality of technical performance of mammography in Slovenia in the last 5 years. (author)

  4. Image quality and patient dose optimization in mammography in Hungary

    International Nuclear Information System (INIS)

    In 1999 the International Atomic Energy Agency initiated a coordinated research program (CRP) with the aim to define a methodology for the implementation of the European QA/QC protocol for mammography in the Eastern European countries. In Hungary three mammography centers with dedicated mammography devices and film-screen systems have been selected for participation in the program. The outcome of mammography can be predicted by image quality evaluation on clinical and test phantom images and the patient doses. The improvement of these performance indicators after QA/QC program implementation should be an outcome of the project. The authors summarize the program of work, the activities and their preliminary results. (author)

  5. The Energy Charter: what is it?

    International Nuclear Information System (INIS)

    The European Energy Charter is a European Community initiative put forward by the Netherlands' Prime Minister Lubbers in June 1990. The intent of the Charter is to set up a framework for co-operation, trade and investment in energy products and services with countries of Eastern Europe and the former Soviet Union, based on principles of free-markets and non-discrimination. A Working Group has been tasked with the development of the protocol on nuclear energy. The basic intent is to facilitate co-operation between the signatories across the entire peaceful nuclear fuel cycle and in related fields and activities. Particular emphasis is placed on achieving and maintaining a high level of nuclear safety. The protocol has a preamble and four parts, dealing with: objectives and commitments; principles of responsible nuclear conduct; trade; investment and technology transfer and administrative arrangements. (author)

  6. Charter school tax credit: Investing in human capital

    OpenAIRE

    Ian Galloway

    2010-01-01

    This working paper considers how two existing policy tools--investment tax credits and charter schools--could be combined to raise operating funds for charter schools that successfully close the poverty-related academic achievement gap. Some charter schools have succeeded in dramatically improving low-income student performance (those run by KIPP, Achievement First, and the Harlem Children's Zone, for example). However, these successful schools differ significantly in type and approach. As a ...

  7. Atarek Kamil Ibrahim & Co. Chartered Accountants

    OpenAIRE

    Zakiah Muhammaddun Mohamed; Aini Aman; Noradiva Hamzah; Sofiah Md. Auzair

    2010-01-01

    Atarek Kamil Ibrahim & Co. Chartered Accountants (hereafter referred to as AKI) is a public accounting firm named after its founder Tuan Haji Atarek Kamil Ibrahim (hereafter referred to as Atarek). The firm offers a wide range of services to its customers since its establishment in 1989. The head office of AKI is in Kuala Lumpur and it has branches in Melaka, Johor Bahru, Ipoh, Kuala Terrengganu, Kota Baru, Kuching, Miri and Kota Kinabalu. The partners of AKI are planning to expand the compan...

  8. A comparison of the accuracy of film-screen mammography, full-field digital mammography, and digital breast tomosynthesis

    International Nuclear Information System (INIS)

    Aim: To measure the change in diagnostic accuracy of conventional film-screen mammography and full-field digital mammography (FFDM) with the addition of digital breast tomosynthesis (DBT) in women recalled for assessment following routine screening. Materials and methods: Ethics approval for the study was granted. Women recalled for assessment following routine screening with screen-film mammography were invited to participate. Participants underwent bilateral, two-view FFDM and two-view DBT. Readers scored each lesion separately for probability of malignancy on screen-film mammography, FFDM, and then DBT. The scores were compared with the presence or absence of malignancy based on the final histopathology outcome. Results: Seven hundred and thirty-eight women participated (93.2% recruitment rate). Following assessment 204 (26.8%) were diagnosed as malignant (147 invasive and 57 in-situ tumours), 286 (37.68%) as benign, and 269 (35.4%) as normal. The diagnostic accuracy was evaluated by using receiving operating characteristic (ROC) and measurement of area under the curve (AUC). The AUC values demonstrated a significant (p = 0.0001) improvement in the diagnostic accuracy with the addition of DBT combined with FFDM and film-screen mammography (AUC = 0.9671) when compared to FFDM plus film-screen mammography (AUC = 0.8949) and film-screen mammography alone (AUC = 0.7882). The effect was significantly greater for soft-tissue lesions [AUC was 0.9905 with the addition of DBT and AUC was 0.9201 for FFDM with film-screen mammography combined (p = 0.0001)] compared to microcalcification [with the addition of DBT (AUC = 0.7920) and for FFDM with film-screen mammography combined (AUC = 0.7843; p = 0.3182)]. Conclusion: The addition of DBT increases the accuracy of mammography compared to FFDM and film-screen mammography combined and film-screen mammography alone in the assessment of screen-detected soft-tissue mammographic abnormalities.

  9. New mammography screen-film combinations

    International Nuclear Information System (INIS)

    Kodak, Kyokko, Agfa-Gevaert, and Siemens (available only in Europe) have introduced mammography screens faster than Kodak's Min R screen. Dupont (Microvision), Fuji (MiMa), and Konica (CM) have introduced single-emulsion mammography films faster than Kodak OM. The authors combined these five screens with the four films to make 20 test object images. One set of films was processed for 90 seconds, the second set for 3 minutes. A 4.5-cm-thick CIRS breast phantom tested the imaging characteristics of the screen-film combinations. Mean glandular doses ranged from 72 mrad for Min R/OM processed for 90 seconds to 28 mrad for Min R med or Afga S screens combined with Dupont or Konica film and processed for 3 minutes

  10. Mammography Radiation Dose and Image Quality

    International Nuclear Information System (INIS)

    The early detection of breast cancer is technologically very challenging for radiography. At present screen-film mammography is the favoured method for early detection of breast cancer. In the United States, screening is under way and a large number of asymptomatic women are being exposed to radiation for the purpose of detecting early occult cancer. The prognosis for this disease is greatly improved if the cancer can be found before it reaches the size of 1 cm. Because of the widespread use of this imaging technology, much attention has been paid to its optimisation in terms of patient radiation dose, required image quality and quality control. Mammography in the USA is regulated by the Federal Government through mandatory facility certification including annual inspections and a specified quality control programme. However, there is still a wide range of radiation dose delivered to achieve a given film optical density and level of image quality. (author)

  11. German pilot projects of mammography screening

    International Nuclear Information System (INIS)

    The carriers of the German Statutory Health Care System have recognized that only mammographic screening according to the European Guidelines for the Quality Assurance of Mammography Screening will permit early detection of breast cancer with an acceptable risk/benefit ratio. In the German pilot projects, regional mammography screening programmes according to the European guidelines are being tested in the framework of the German health care system. The European guidelines require comprehensive quality assurance of all relevant steps in the chain of events involved in screening, from invitation on to therapy and follow-up. Such comprehensive quality assurance involves several medical specialities and other professional groups dealing with out-patient and in-patient health care and requires long-term cooperation with public institutions (population registries, cancer registries). The objective of the pilot projects is to test the organizational and legal conditions essential to introduction of a mammographic screening programme according to the European quality assurance guidelines in Germany. (orig.)

  12. Digital mammography: an overview and quality assurance

    International Nuclear Information System (INIS)

    Unlike other parts of the body, the breast is composed mainly of soft tissues. When breast tissues are x-rayed, it creates an image that looks something like a smoky haze, making It difficult to see tiny spots called micro calcifications and other subtle signs of early cancer. With digital mammography, the radiologist reviews electronic images of the breast using special high resolution monitors. The physician can adjust the brightness, change contrast and zoom in for close-ups of specific areas of interest. Being able to manipulate images is one of the main benefits of digital mammography. Your mammogram images can even be made available to your doctor to view over an office computer. The images can also be printed on film if needed

  13. Authenticity and integrity of digital mammography images.

    Science.gov (United States)

    Zhou, X Q; Huang, H K; Lou, S L

    2001-08-01

    Data security becomes more and more important in telemammography which uses a public high-speed wide area network connecting the examination site with the mammography expert center. Generally, security is characterized in terms of privacy, authenticity and integrity of digital data. Privacy is a network access issue and is not considered in this paper. We present a method, authenticity and integrity of digital mammography, here which can meet the requirements of authenticity and integrity for mammography image (IM) transmission. The authenticity and integrity for mammography (AIDM) consists of the following four modules. 1) Image preprocessing: To segment breast pixels from background and extract patient information from digital imaging and communication in medicine (DICOM) image header. 2) Image hashing: To compute an image hash value of the mammogram using the MD5 hash algorithm. 3) Data encryption: To produce a digital envelope containing the encrypted image hash value (digital signature) and corresponding patient information. 4) Data embedding: To embed the digital envelope into the image. This is done by replacing the least significant bit of a random pixel of the mammogram by one bit of the digital envelope bit stream and repeating for all bits in the bit stream. Experiments with digital IMs demonstrate the following. 1) In the expert center, only the user who knows the private key can open the digital envelope and read the patient information data and the digital signature of the mammogram transmitted from the examination site. 2) Data integrity can be verified by matching the image hash value decrypted from the digital signature with that computed from the transmitted image. 3) No visual quality degradation is detected in the embedded image compared with the original. Our preliminary results demonstrate that AIDM is an effective method for image authenticity and integrity in telemammography application. PMID:11513029

  14. Similarities and Differences in the Organizational Characteristics of Charter Schools: A Test of Institutional Isomorphism and Strategy Positioning Theories

    Science.gov (United States)

    Sweet, Thomas

    2013-01-01

    Charter schools, independent public schools which operate through a system of contracts with public agencies, are heavily promoted as a means of improving the nation's traditional public education system. Managed as private enterprises, these schools compete for students through the implementation of market-style practices. Popularly viewed…

  15. Promoting screening mammography: insight or uptake?

    Science.gov (United States)

    Keen, John D

    2010-01-01

    The US Preventive Services Task Force has emphasized individualized decision-making regarding participation in screening mammography for women ages 40 to 49. Positive public opinion regarding screening mammography is understandable given that screening advocates have heavily promoted the slogan "early detection saves lives" while ignoring screening harms. The goal of mammography screening advocates is to increase screening participation or uptake. The purpose of this paper is to promote physician and patient insight by presenting the age-related benefit and harms of screening. At age 50, routine screening saves approximately 1 woman per 1000 over 10 years. The life-saving proportion of screen-detected cancers is 5%, which means mammograms must detect 21 cancers to save one life. Almost half of screen-detected cancers represent pseudo-disease and would never become symptomatic yet alone lethal during a woman's lifetime. Consequently, 40- and 50-year-old women are 10 times more likely to experience overdiagnosis and overtreatment than to have their lives saved. Analysis of events and outcomes per single screening round for women ages 40 to 49 show that approximately 9600 screening mammograms, 960 diagnostic exams, and 90 to 140 biopsies are required to save one life. Given the substantial harms of screening, advocates should refocus their priority from promoting uptake to promoting insight. PMID:21057074

  16. Screening for breast cancer with mammography

    International Nuclear Information System (INIS)

    Mammography is generally accepted as a useful problem-solving clinical tool in characterizing known breast lesions, so that appropriate and timely treatment can be given. However, it remains grossly underutilized at what it does best: screening. The major strengths of mammography are (a) its ability to detect breast cancer at a smaller, potentially more curable stage than any other examination, and (b) its proved efficacy in reducing breast cancer mortality in asymptomatic women aged 40-74. If, as has recently been estimated, screening with mammography and physical examination can be expected to lower breast cancer deaths by 40%-50% among those actually examined (13), then the lives of almost 20,000 U.S. women might be saved each year if screening were to become very widely used. The challenges of the next decade are clear, to mount much more effective campaigns to educate physicians and lay women about the life-saving benefits of breast cancer screening, to devise increasingly effective and lower cost screening strategies, to further improve the current high quality of mammographic imaging despite its increasing proliferation, and to train large numbers of breast imaging specialists to guarantee that the growing case load of screening and problem-solving mammograms is interpreted with a very high level of skill

  17. Optimized exposure control in digital mammography

    Science.gov (United States)

    Shramchenko, Nataliya; Blin, Philippe; Mathey, Claude; Klausz, Remy

    2004-05-01

    A method for the determination of optimal operating points of digital mammography systems is described. The digital mammography equipment uses a flat panel detector and a bi-metal molybdenum/rhodium x-ray tube. An operating point is defined by the selection of the x-ray tube target material, x-ray filtration, kVp and detector entrance dose. Breast thickness and composition are estimated from a low dose pre-exposure, then used to index tables containing sets of operating points. The operating points are determined using a model of the image chain, which computes contrast to noise ratio (CNR) and average glandular dose (AGD) for all possible exposure conditions and breast thickness and composition combinations. The selected operating points are those which provide the required CNR for the lowest AGD. An AGD reduction of 30% to 50% can be achieved for comparable Image Quality, relative to current operating points. Resulting from the optimization process, the rhodium target is used in more than 75% of cases. Measurements of CNR and AGD have been performed on various tissue equivalent materials with good agreement between calculated and measured values. The proposed method provides full Image Quality benefit of digital mammography while minimizing dose to patients in a controlled and predictive way.

  18. Breast cancer screening: the underuse of mammography

    International Nuclear Information System (INIS)

    The early detection of breast cancer is promoted by the American Cancer Society (ACS) and the American College of Radiology (ACR) by encouraging the regular use of three types of screening: breast self-examination (BSE), the clinical breast examination, and mammography. In August 1983, the ACS publicized seven recommendations pertaining to screening, including a revised statement about the routine use of mammography for women between the ages of 40 and 49 years. In response to the ACS statement, the present study assessed compliance with the updated recommendations for all three types of screening. The results show reasonable rates of compliance for the BSE (53%-69%) and clinical examination (70%-78%). In contrast, only 19% of the women between the ages of 35 and 49 and 25% of the women older than 50 reported complying with the recommendation to undergo one baseline screening mammogram. Some implications for health education by physicians and the professional education of physicians in the use of mammography are discussed

  19. Quality assurance of mammography training courses via questionnaires. Eighth report

    International Nuclear Information System (INIS)

    To maintain a sufficient number of qualified reading doctors for breast cancer mammography screening, we have held training courses across the nation. Grade-up examinations have been carried out for doctors who had failed to attain grade A or B at the training courses. We have evaluated the quality assurance of the examinations via questionnaires and reported the results on 7 previous occasions. In the present investigation, we reviewed all answers obtained from questionnaires at the previous 19 examinations, from the first one (November, 2000) until the last one (March, 2007). There were a total of 3,380 applicants, of whom 402 (11.9%) obtained grade A and 2,008 (59.4%) grade B. Thus a total 2,410 applicants (71.3%) obtained either A or B, and this rate was considerably superior to the 56% obtained in the first three examinations, although the former rate included the results of repeated applicants. These good results may have been due to an increase in the quality of the training courses and may have been affected by conducting the examinations not only in Nagoya but also in Tokyo and Osaka. In a period of about 10 months after April, 2004, the certification standard was increased and a system of certification reappraisal every 5 years was adopted. At that time, more than 75% of all applicants were A- or B-certified doctors at the 9th and 10th examinations, and the good results might have reflected the fact that many doctors tried hard to maintain a high reading ability. In February, 2005, the certification standard reverted to the previous one for various reasons, and the rate of A- or B-certified doctors decreased. In October, 2006, the examination changed from 100 questions concerning one-direction mammography to 50 one-direction questions and 50 two-direction questions, because of the adoption of two-direction mammography to age 40 years. Since it was widely recognized that the second reading at breast cancer screening should be done by A-certified doctors

  20. Latest on Laser Mammography in the Diagnosis of Breast Cancer

    Directory of Open Access Journals (Sweden)

    M.Sh. Arshad

    2007-05-01

    Full Text Available Background and Objective: Breast compression and radiation fears/dangers are the most prevalent causes reported by women avoiding mammography, rou-tinely or otherwise. This study was carried out to find out the accuracy/precision and quality of laser mam-mography in diagnosing breast cancer amongst women and compared the results with routine meth-ods of mammography. Materials and Methods: Eighty patients with the di-agnosis of breast cancer by routine/ordinary mam-mography were also studied by laser mammography in two hospitals in Canada and one hospital in the United States of America the results of which I saw during a recent academic trip to those countries. The apparatus consists of a table on which the woman lies down and her breast hangs through a hole in the ta-ble. The laser beam rotates at an angle of 360 degrees around the hanging breast and images are obtained and stored in a computer. Biopsy may also be ob-tained simultaneously. Results: Excellent high quality images of breast tu-mors are obtained with specific precise localization of them far superior to those images obtained by ordi-nary/routine mammography, and simultaneous bi-opsy confirming the diagnosis. We will screen a video film about the methods and results of this technique at the congress too. Conclusion: Laser mammography is safe, accurate, reliable, pain free, compression free mammography. It is assumed that laser mammography will establish its place in mammography and will replace the cur-rent methods of mammography.

  1. Grids in mammography: Optimization of the information content relative to radiation risk

    International Nuclear Information System (INIS)

    The use of grids in mammography screening has been an issue of debate in recent years. Based upon the experience of a pilot study of mammography screening in Sweden, the Swedish National Institute of Radiation Protection concluded that screening could be successfully performed without having to increase the mean absorbed dose in a standard breast above 1 mGy. Due to the Institute's limit for the mean absorbed dose, 'not essentially exceeding 1 mGy', the use of grids was effectively ruled out. Experience, however, has indicated that the improved image quality using a grid would reduce the number of healthy women which are called to complementary examinations. Therefore, the use of grids in screening procedures is being reconsidered. The aim of this work was to elucidate the problem by investigating the influence of grid construction on image contrast and breast mean absorbed dose by means of Monte Carlo techniques to simulate the photon transport in the breast

  2. Factors Associated with Use of Mammography in Women over 50 years. Cartagena

    Directory of Open Access Journals (Sweden)

    Irma Yolanda Castillo Ávila

    2014-05-01

    Full Text Available Objective: To determine the factors associated with the use of mammography in women over 50 years of Cartagena. Materials and Methods: We performed across-sectional study, with a popu-lation of 49 987 women over 50 years of Cartagena. We estimated a sample size of 909 women, obtained by conglomerates. To gather information was used: a socio-demographic survey, the Apgar questionnaire to measure perception of family functioning, the Duke-11questionnaireto measure perceived social support and a scale to measure satisfaction with services. For the analysis of the data using descriptive statistics, were calculated to estimate OR association between some factors and the use of mammography, using the statistical software version 15 SPSSS. Explanatory variables were considered using mammography to those with a chi2 test less than 5 %. Results: A total of 909 women, 59.5 % (541 reported having had mammograms, only314 (34.5 %, were made in the past two years, according to the national technical rule. Among the factors that ex¬plain the use of mammography, is having partner [OR= 1.3 (95 % CI 1.04 to 1.8], coexisting with less than four [OR = 0.4 (95 % CI 0.3 to 0.6] and have completed comprehensive school and older [OR = 2.2 (95 % CI 1.67 to 3.04]. Conclusion: More than half of women surveyed reported having had a mammogram, but frequency of use, does not comply with the provisions of the national technical rule. Personal and family factors are associated with the use of the test.

  3. Breast density and outcome of mammography screening: a cohort study

    DEFF Research Database (Denmark)

    Olsen, A H; Bihrmann, K; Jensen, M-B;

    2009-01-01

    The purpose of this study was to investigate the effect of breast density on breast cancer (BC) mortality in a mammography screening programme. The cohort included 48 052 women participating in mammography screening in Copenhagen, Denmark, where biennial screening is offered to women aged 50...

  4. Evaluation of breast symptoms with mammography and ultrasonography

    Directory of Open Access Journals (Sweden)

    Emine Devolli Disha

    2011-12-01

    Full Text Available Introduction: Aim of the study was to discern which are more frequent symptoms presented in malign and benign masses diagnosed by mammography and ultrasonography.Methods: Our study group consisted of 546 female patients, with breast symptoms such as palpable lumps (40.8%, pain in the breast (26%, localized lumpiness or nodularity (13.7%, nipple retraction (11.2%, nipplebloody discharge (5.1% and redness and swelling of the breast (3.1%. All 546 patients were examined by ultrasonography and mammography. Biopsy was performed according to the findings of mammography and ultrasonography.Results: In breast cancer detection ultrasonography showed an efficiency of 79.4% compared to 55.0% for mammography in detecting breast lump, in the case of nipple retraction mammography showed an efficiency of 89.1% compared to 80.4% for ultrasound, while the lowest efficiency for mammography was in the cases with localized lumpiness or nodularity 17.1% compared to 45.7% for ultrasound. In detecting fibrocystic changes where the most common symptoms was pain, ultrasonography showed an efficiency of 99.3 % compared to 84.2 % for mammography.Conclusions: Our study confirmed that breast lumps are detectable in the majority of patients with breast cancer. The most frequent symptoms in patient with benign lesions were pain or localized discomfort. The diagnostic accuracy for carcinomas of the breast and for benign lesions according to symptoms was higher for ultrasound than for mammography.

  5. Screening Mammography Utilization in Tennessee Women: The Association with Residence

    Science.gov (United States)

    Brown, Kathleen C.; Fitzhugh, Eugene C.; Neutens, James J.; Klein, Diane A.

    2009-01-01

    Context: Approximately 70% of US women over age 40 report mammography screening within 2 years. However, rates are likely to vary by age, income, educational level, and residence. Purpose: To describe the prevalence of screening mammography and associated factors in women living in rural and urban areas of Tennessee. Methods: Using pooled data…

  6. THE VALUE OF ULTRASOUND MAMMOGRAPHY IN PALPABLE BREAST MASSES

    NARCIS (Netherlands)

    VANOORD, JC; VANDERVLIET, AM; THYN, CJP; MAK, B; HOOGEBOOM, GJ

    1991-01-01

    Between January 1987 and May 1988 a prospective study was carried out on 232 women with a palpable breast mass. They underwent physical examination, x-ray mammography and ultrasound mammography. The results of each study were interpreted independently by separate observers, and consensus was achieve

  7. SCREENING MAMMOGRAPHY IN 35-60 YEARS AGE GROUP

    Directory of Open Access Journals (Sweden)

    Manoj

    2015-10-01

    Full Text Available OBJECTIVE: Screening mammography among 35-60 years of age group of patients has been clearly shown to reduce mortality from breast cancer. METHODS: Patients were selected from OPDs of various departments. Patients of 35-60 years of ages were included as part of the study. Detail family and menstrual history were taken and then mammography of both breasts was performed. RESULTS: Out of 60 cases coming for screening mammography, 42 were found to be some type of lesions in mammography; however 18 patients were with no findings. Commonest breast density found to be scattered areas of fibro glandular density followed by heterogeneously dense breasts. Most of the patients with heterogeneously dense breast density were found to be in their luteal phase of menstrual cycle. Lesions were classified according to BIRADS category. CONCLUSION: Screening mammography can detect various breast lesions both in symptomatic and asymptomatic individuals and thereby helping patient managements.

  8. Influence of the radiographer on the pain felt during mammography

    International Nuclear Information System (INIS)

    Mammography is the only useful examination in screening for breast cancer. Mortality from breast cancer can be reduced if women go regularly for a screening mammography. Moreover, it is still the key examination in diagnosis of breast diseases and in the follow-up of patients treated for breast cancer. Pain with mammography can deter women from going for regular screening or follow-up; therefore, it is important to reduce pain experience or discomfort from mammography. In this study we evaluate the impact of the ''radiographer'' on the pain risk during mammography by analysing questionnaires filled in by women and radiographers. Study results reveal that the opinion of the radiographer, the information and communication during the examination and the number of years of experience are important factors in pain and discomfort experience. The attitude of the radiographer plays an important role in the pain experience. (orig.)

  9. Mammography discomfort: a holistic perspective derived from women's experiences

    International Nuclear Information System (INIS)

    Purpose: Mammography discomfort has the potential to deter women from attending for regular breast screening. Previous studies have focussed on the pain/discomfort of the mammography procedure itself. The purpose of this study was to consider discomfort from a holistic perspective of the mammography experience derived from the women themselves. Methods: Qualitative research methods were employed. Using theoretical sampling, 12 women who had recently experienced mammography were interviewed. The interview questions aimed to explore the experience of women attending for a mammogram from arrival to departure and beyond in order to identify aspects which potentially increase discomfort. Data analysis involved coding and categorisation and identification of key concepts and their relationships. Results: A conceptual framework was developed that demonstrates the contributors to mammography discomfort and the relationships between these as identified by the women. Conclusions: The conceptual framework has important implications for clinical practice and future research

  10. Descriptive study of the quality control in mammography

    International Nuclear Information System (INIS)

    The goal of mammography is to provide contrast between a lesion that is possible residing within the breast and normal surrounding tissue. Quality control is essential for maintaining the contrast imaging performance of a mammography system and incorporate tests that are relevant in that they are predictive of future degradation of contrast imaging performance. These tests will also be done at frequency that is high enough to intercept most drifts in quality imaging or performance before they become diagnostically significant. The quality control study has as objective to describe the results of the assessment of quality imaging elements (film optical density, contrast (density difference), uniformity, resolution and noise) of 62 mammography departments without quality control program and comparison these results with a mammography reference department with a quality control program. When comparing the results they allow seeing the clinical utility of to have a quality control program to reduce the errors of mammography interpretation. (Author)

  11. North Carolina's Flexible Charter School Law: Is Too Much Flexibility Good for Charter Schools?

    Science.gov (United States)

    Brown, Frank

    1999-01-01

    North Carolina charter schools are operated by private, nonprofit corporations with federal, tax-exempt status and multicharter licenses. The application process is easy, the political climate under Governor Jim Hunt is progressive, and public employees are not unionized. On balance, the system seems both flexible and accountable to taxpayers.…

  12. Is Administration Leaner in Charter Schools? Resource Allocation in Charter and Traditional Public Schools

    Science.gov (United States)

    Arsen, David; Ni, Yongmei

    2012-01-01

    There is widespread concern that administration consumes too much of the educational dollar in traditional public schools, diverting needed resources from classroom instruction and hampering efforts to improve student outcomes. By contrast, charter schools are predicted to have leaner administration and allocate resources more intensively to…

  13. Contrast-Enhanced Spectral Mammography: Comparison with Conventional Mammography and Histopathology in 152 Women

    Energy Technology Data Exchange (ETDEWEB)

    Luczyńska, Elzbieta; Heinze-Paluchowska, Sylwia; Dyczek, Sonia [Department of Radiology, Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, Krakow 31-115 (Poland); Blecharz, Pawel [Department of Gynecologic Oncology, Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, Krakow 31-115 (Poland); Rys, Janusz [Department of Tumour Pathology, Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, Krakow 31-115 (Poland); Reinfuss, Marian [Department of Radiotherapy, Centre of Oncology, Maria Sklodowska-Curie Memorial Institute, Krakow 31-115 (Poland)

    2014-07-01

    The goal of the study was to compare conventional mammography (MG) and contrast-enhanced spectral mammography (CESM) in preoperative women. The study was approved by the local Ethics Committee and all participants provided informed consent. The study included 152 consecutive patients with 173 breast lesions diagnosed on MG or CESM. All MG examinations and consults were conducted in one oncology centre. Non-ionic contrast agent, at a total dose of 1.5 mL/kg body weight, was injected intravenous. Subsequently, CESM exams were performed with a mammography device, allowing dual-energy acquisitions. The entire procedure was done within the oncology centre. Images from low and high energy exposures were processed together and the combination provided an 'iodine' image which outlined contrast up-take in the breast. MG detected 157 lesions in 150 patients, including 92 infiltrating cancers, 12 non-infiltrating cancers, and 53 benign lesions. CESM detected 149 lesions in 128 patients, including 101 infiltrating cancers, 13 non-infiltrating cancers, and 35 benign lesions. CESM sensitivity was 100% (vs. 91% for MG), specificity was 41% (vs. 15% for MG), area under the receiver operating characteristic curve was 0.86 (vs. 0.67 for MG), and accuracy was 80% (vs. 65% for MG) for the diagnosis of breast cancer. Both MG and CESM overestimated lesion sizes compared to histopathology (p < 0.001). CESM may provide higher sensitivity for breast cancer detection and greater diagnostic accuracy than conventional mammography.

  14. Average glandular dose in routine mammography screening using a Sectra Microdose Mammography unit

    International Nuclear Information System (INIS)

    The Sectra MicroDose Mammography system is based on direct photon counting (with a solid-state detector), and a substantially lower dose to the breast than when using conventional system can be expected. In this work absorbed dose measurements have been performed for the first unit used in routine mammography screening (at the Hospitals of Helsingborg (Sweden)). Two European protocols on dosimetry in mammography have been followed. Measurement of half value layer (HVL) cannot be performed as prescribed, but this study has demonstrated than non-invasive measurements of HVL can be performed accurately with a sensitive and well collimated solid-state detector with simultaneous correction for the energy dependence. The average glandular dose for a 50 mm standard breast with 50% glandularity, simulated by 45 mm polymethylmethacrylate, was found to be 0.21 and 0.28 mGy in March and December 2004, respectively. These values are much lower than for any other mammography system on the market today. It has to be stressed that the measurement were made using the current clinical settings and that no systematic optimisation of the relationship between absorbed dose and diagnostic image quality has been performed within the present study. In order to further increase the accuracy of absorbed dose measurements for this unit, the existing dose protocols should be revised to account also for the tungsten/aluminium anode/filter combination, the multi-slit pre-collimator device and the occurrence of a dose profile in the scanning direction. (authors)

  15. Contrast-Enhanced Spectral Mammography: Comparison with Conventional Mammography and Histopathology in 152 Women

    International Nuclear Information System (INIS)

    The goal of the study was to compare conventional mammography (MG) and contrast-enhanced spectral mammography (CESM) in preoperative women. The study was approved by the local Ethics Committee and all participants provided informed consent. The study included 152 consecutive patients with 173 breast lesions diagnosed on MG or CESM. All MG examinations and consults were conducted in one oncology centre. Non-ionic contrast agent, at a total dose of 1.5 mL/kg body weight, was injected intravenous. Subsequently, CESM exams were performed with a mammography device, allowing dual-energy acquisitions. The entire procedure was done within the oncology centre. Images from low and high energy exposures were processed together and the combination provided an 'iodine' image which outlined contrast up-take in the breast. MG detected 157 lesions in 150 patients, including 92 infiltrating cancers, 12 non-infiltrating cancers, and 53 benign lesions. CESM detected 149 lesions in 128 patients, including 101 infiltrating cancers, 13 non-infiltrating cancers, and 35 benign lesions. CESM sensitivity was 100% (vs. 91% for MG), specificity was 41% (vs. 15% for MG), area under the receiver operating characteristic curve was 0.86 (vs. 0.67 for MG), and accuracy was 80% (vs. 65% for MG) for the diagnosis of breast cancer. Both MG and CESM overestimated lesion sizes compared to histopathology (p < 0.001). CESM may provide higher sensitivity for breast cancer detection and greater diagnostic accuracy than conventional mammography

  16. 77 FR 8810 - Availability of Seats for the Gray's Reef National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2012-02-15

    ... Gray's Reef National Marine Sanctuary Advisory Council: Sport diving and charter/commercial fishing... they are applying; community and professional affiliations; philosophy regarding the protection...

  17. Review of "Going Exponential: Growing the Charter School Sector's Best"

    Science.gov (United States)

    Garcia, David

    2011-01-01

    This Progressive Policy Institute report argues that charter schools should be expanded rapidly and exponentially. Citing exponential growth organizations, such as Starbucks and Apple, as well as the rapid growth of molds, viruses and cancers, the report advocates for similar growth models for charter schools. However, there is no explanation of…

  18. 76 FR 79751 - Industry Advisory Panel: Notice of Charter Renewal

    Science.gov (United States)

    2011-12-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF STATE Industry Advisory Panel: Notice of Charter Renewal The Under Secretary for Management has approved the renewal of the charter for the U.S. Department of State Bureau of Overseas Buildings Operations' (OBO)...

  19. Indianapolis Mayor Bart Peterson: The Peyton Manning of Charter Schools

    Science.gov (United States)

    Skinner, David

    2007-01-01

    Indianapolis Mayor Bart Peterson has laid down a bold challenge to the city's troubled public school system: improve or see your students migrate to the city's growing roster of impressive charter schools. This is no idle threat. In the 2006-2007 academic year, the mayor oversaw 16 charter schools serving 3,870 students. Peterson is currently the…

  20. Cultivating Life Skills at a Project-Based Charter School

    Science.gov (United States)

    Wurdinger, Scott; Enloe, Walter

    2011-01-01

    Surveys that focused on academic and life skill development were collected from alumni who attended Avalon Charter School in St Paul, Minnesota. Avalon is a small public charter school that uses project-based learning as their primary teaching method. Forty-two alumni responded to the online survey. Students ranked life skills such as creativity,…

  1. Charter School Competition, Organization, and Achievement in Traditional Public Schools

    Science.gov (United States)

    Davis, Tomeka M.

    2013-01-01

    Market models of education reform predict that the growth of charter schools will infuse competition into the public school sector, forcing traditional public schools to improve the practices they engage in to educate students. Some scholars have criticized these models, arguing that competition from charter schools is unlikely to produce…

  2. Haven Charter Schools: Separate by Design and Legally Questionable

    Science.gov (United States)

    Eckes, Suzanne

    2015-01-01

    This article examines the legal and policy complexities involved with students who are self-selecting into haven charter schools. Haven charter schools are those that intend to create a safe place for students with complex histories who may have been intimidated by a dominant group in their former schools. For the purpose of this study, haven…

  3. Principles & Standards for Quality Charter School Authorizing. 2012 Edition

    Science.gov (United States)

    National Association of Charter School Authorizers (NJ1), 2012

    2012-01-01

    Charter school authorizing is a powerful strategy for making excellent public schools and educational opportunities available to all students. Done well, charter authorizing increases student achievement by expanding the supply of quality public schools to satisfy unmet needs--particularly by providing life-changing opportunities for students…

  4. State Policy Snapshot: School District Facilities and Public Charter Schools

    Science.gov (United States)

    Simnick, Russ

    2015-01-01

    One of the greatest challenges to the health of the public charter school movement is access to adequate facilities in which the schools operate. Public charter school facilities are rarely funded on par with school district facilities. Over the years, more states have come to realize that they have an obligation to ensure that all public school…

  5. Comparing New School Effects in Charter and Traditional Public Schools

    Science.gov (United States)

    Kelly, Andrew P.; Loveless, Tom

    2012-01-01

    This study investigates whether student achievement varies during the institutional life span of charter schools by comparing them to new public schools. The results show that there is little evidence that new public schools struggle with initial start-up issues to the same extent as new charter schools. Even after controlling for school…

  6. Details from the Dashboard: Charter School Race/Ethnicity Demographics

    Science.gov (United States)

    National Alliance for Public Charter Schools, 2012

    2012-01-01

    This "Details from the Dashboard" report examines race/ethnicity breakouts for public charter schools and traditional public schools at the state and the school district level. The data in this report indicate that in the large majority of states, the race/ethnicity student demographics of charter schools are almost identical to those of the…

  7. The Notion of Charter Schools and Its Feasibility in Turkey

    Science.gov (United States)

    Solak, Ekrem; Özaskin, Aysegül

    2015-01-01

    The purpose of this study was to investigate the feasibility of Charter School system in Turkey, which was opened firstly in State of Minnesota of United States and was expanded to approximately 40 states in America today and also, in practice in some countries such as Canada, New Zealand, United Kingdom, Sweden and Norway. Charter Schools are…

  8. Teacher Classroom Management Ratings at Concept Charter Schools

    Science.gov (United States)

    Senlik, Yasar

    2013-01-01

    The purpose of this study is to identify the factors that impact the classroom management rating score of teachers at Concept Schools managed charter schools. Concept Schools, a non-profit management and consulting organization that manages charter schools in the Midwest, has adapted Charlotte Danielson's rubrics for "Enhancing Professional…

  9. Charter Schools and the Teacher Job Search in Michigan

    Science.gov (United States)

    Cannata, Marisa

    2010-01-01

    This paper examines the position of charter schools in prospective elementary teachers' job search decisions. Using a labor market segmentation framework, it explores teacher applicants' decisions to apply to charter schools. The data come from a mixed-methods longitudinal study of prospective teachers looking for their first job. This paper finds…

  10. Recognising and Developing Urban Teachers: Chartered London Teacher Status

    Science.gov (United States)

    Bubb, Sara; Porritt, Vivienne

    2008-01-01

    Chartered London Teacher (CLT) status is a unique scheme designed by London Challenge to recognise and reward teachers' achievements and provide a framework for professional development. As well as having the prestige of being a Chartered London Teacher for life, educators receive a one-time payment of 1,000 British pounds from the school budget…

  11. Much Ado about Nothing? Innovation in Charter Schools

    Science.gov (United States)

    Preston, Courtney; Goldring, Ellen; Berends, Mark; Cannata, Marisa

    2011-01-01

    The purpose of this paper is to develop a framework for measuring innovation in charter schools. The authors ask two questions: (1) What practices constitute innovation in various local and state contexts?; and (2) Do levels and types of innovation differ between charter schools and traditional public schools? The authors' sample frame includes…

  12. 77 FR 31682 - Renewal of Cultural Property Advisory Committee Charter

    Science.gov (United States)

    2012-05-29

    ... material the pillage of which places a country's cultural heritage in jeopardy. The Committee makes... Heritage Center, U.S. Department of State, Bureau of Educational and Cultural Affairs, 2200 C Street NW... of Cultural Property Advisory Committee Charter SUMMARY: The Charter of the Department of...

  13. Principal Turnover: Upheaval and Uncertainty in Charter Schools?

    Science.gov (United States)

    Ni, Yongmei; Sun, Min; Rorrer, Andrea

    2015-01-01

    Purpose: Informed by literature on labor market and school choice, this study aims to examine the dynamics of principal career movements in charter schools by comparing principal turnover rates and patterns between charter schools and traditional public schools. Research Methods/Approach: This study uses longitudinal data on Utah principals and…

  14. Charter Schools and Special Education: Balancing Disparate Visions. An Investigation of Charter Schools and Special Education in Fifteen States.

    Science.gov (United States)

    Rhim, Lauren M.; McLaughlin, Margaret J.

    This report describes activities and findings of Project SEARCH, an on-going qualitative research project investigating the current status of policies regarding children with disabilities in charter schools. The project has involved a preliminary analysis of all current charter laws to examine the inclusion of students with disabilities and a more…

  15. Thyroid absorbed dose using TLDs during mammography

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez A, M.; Melendez L, M. [IPN, Centro de Investigacion y de Estudios Avanzados, Av. IPN 2508, Col. San Pedro Zacatenco, 07360 Mexico D. F. (Mexico); Davila M, P., E-mail: biomedica.sst@gmail.com [UNEME-DEDICAM de Ciudad Victoria, Circuito Medico s/n, 87087 Ciudad Victoria, Tamaulipas (Mexico)

    2015-10-15

    Full text: In this study, the mean glandular dose (MGD) and the thyroid dose (D Thy) were measured in 200 women screened with mammography in Cranio caudal (Cc) and mediolateral oblique projections. All mammograms were performed with Giotto-Ims (6000-14-M2 Model) equipment, which was verified to meet the criteria of quality of NOM-229-Ssa-2002. During audits performance and HVL, for each anode filter combinations was measured with the camera Radcal mammography equipment 10 X 6-6M (HVL = 0.26 mm Al). D Thy measurements were performed with TLD dosimeters (LiF:Mn) , that were read with the Harshaw 3500 TLD reader. The MGD, was obtained according to the UK and European protocols for mammographic dosimetry using a plane parallel chamber (Standard Imaging, Model A-600) calibrated by a radiation beam UW-23-Mo (= 0.279 mm Al HVL). A comparative statistical analysis was carried out with the measured MGD and D thy. The thyroid mean dose was 0.063 mGy and 0.078 mGy for Cc and mediolateral oblique respectively. There is a linear correlation between the MGD and the D Thy slightly influenced by the anode-filter combination. Using a 95% for the confidence interval in MGD (1.07 mGy), the 90% of measurements are in agreement with the established uncertainty limits. The D Thy are lower than the MGD. There is no risk for cancer induction in thyroid in women due to mammography screening. (Author)

  16. Thyroid absorbed dose using TLDs during mammography

    International Nuclear Information System (INIS)

    Full text: In this study, the mean glandular dose (MGD) and the thyroid dose (D Thy) were measured in 200 women screened with mammography in Cranio caudal (Cc) and mediolateral oblique projections. All mammograms were performed with Giotto-Ims (6000-14-M2 Model) equipment, which was verified to meet the criteria of quality of NOM-229-Ssa-2002. During audits performance and HVL, for each anode filter combinations was measured with the camera Radcal mammography equipment 10 X 6-6M (HVL = 0.26 mm Al). D Thy measurements were performed with TLD dosimeters (LiF:Mn) , that were read with the Harshaw 3500 TLD reader. The MGD, was obtained according to the UK and European protocols for mammographic dosimetry using a plane parallel chamber (Standard Imaging, Model A-600) calibrated by a radiation beam UW-23-Mo (= 0.279 mm Al HVL). A comparative statistical analysis was carried out with the measured MGD and D thy. The thyroid mean dose was 0.063 mGy and 0.078 mGy for Cc and mediolateral oblique respectively. There is a linear correlation between the MGD and the D Thy slightly influenced by the anode-filter combination. Using a 95% for the confidence interval in MGD (1.07 mGy), the 90% of measurements are in agreement with the established uncertainty limits. The D Thy are lower than the MGD. There is no risk for cancer induction in thyroid in women due to mammography screening. (Author)

  17. Breast compression in mammography: pressure distribution patterns

    Energy Technology Data Exchange (ETDEWEB)

    Dustler, Magnus; Froejd, Patrik; Mattsson, Soeren; Tingberg, Anders; Foernvik, Daniel [Medical Radiation Physics, Lund Univ., Skaane Univ. Hospital, Malmoe (Sweden)], E-mail: Magnus.Dustler@med.lu.se; Andersson, Ingvar; Zackrisson, Sophia [Diagnostic Centre of Imaging and Functional Medicine, Lund Univ., Skaane Univ. Hospital, Malmoe (Sweden); Brorson, Haakan [Plastic and Reconstructive Surgery, Dept. of Clinical Sciences Malmoe, Lund Univ., Skaane Univ. Hospital, Malmoe (Sweden)

    2012-11-15

    Background Breast compression is important in mammography in order to improve image quality, better separate tissue components, and reduce absorbed dose to the breast. In this study we use a method to measure and visualize the distribution of pressure over a compressed breast in mammography. Purpose To measure and describe the pressure distribution over the breast as a result of applied breast compression in mammography. Material and Methods One hundred and three women aged 40.7-74.3 years (median, 48.9 years) invited for mammographic screening consented to take part in this study. They were subjected to two additional breast compressions of the left breast (standard force and approximately 50% reduction). Pressure images of the compressed breast were obtained using force sensing resistor (FSR) sensors placed underneath the compression plate. Subjects rated their experience of pain on a visual analogue scale (VAS). Results Four pressure patterns were identified, fitting 81 of the 103 breasts, which were grouped accordingly. The remaining 22 breasts were found to correspond to a combination of any two patterns. Two groups (43 breasts) showed pressure mainly over the juxtathoracic part of the breast, had significantly greater breast thickness (P = 0.003) and had a lower mean pressure over dense tissue (P < 0.0001) than those with more evenly distributed pressure. Reducing compression force increased average breast thickness by 1.8 mm (P < 0.0001). Conclusion The distribution of pressure differed greatly between breasts. In a large proportion of breasts the compression plate did not provide optimal compression of the breast, the compression force being absorbed in juxtathoracic structures.

  18. Dosimetric evaluation in conventional and CR mammography

    International Nuclear Information System (INIS)

    Full text of publication follows: Advances in image diagnosis had lead recently to a more extended application of digital technologies, specially concerning to x-ray devices. This kind of feature permits an easy exchange of information between centers through the net and reduces store volumes which had to be big enough for conventional radiography storing. Nevertheless it is also questionable which exposure conditions would be more suitable when digital mammography is performed, in order to obtain images with a comparable quality with conventional ones. Dose absorption is then an important variable, as the change of procedures should not imply higher dose levels. Several exposures have been done in different mammography centers. With the same x-ray source, developing was made in two ways, the conventional one consisting of a film cassette, with chemical developing and digital scan, using a phosphor imaging plate and computer processing. Two phantom model where used for the exposures, those are CIRS 11A mamo phantom SP01 and CIRS M017 phantom. The variables considered where, in the one hand, optical density in a range of [-2,+2] for conventional case and [0,4] for digital case, setting voltage at 28 kV. On the other hand, for an intermediate optical density, the voltage was set in a range from 26 to 30 kV. Once the images were obtained, and using conversion factors from the European Protocol of Dosimetry in Mammography, doses from all exposures were calculated. Every pair of images (conventional and digital ones) were then compared, which permitted to state which one is optimal in terms of image quality and absorbed dose. (authors)

  19. Mammography - recent technical developments and their clinical potential

    International Nuclear Information System (INIS)

    The recent technical developments in digital as well as screen-film X-ray mammography have been reviewed in order to evaluate their clinical potential and to analyse possible lines for future development. Material and methods: The scientific literature has been reviewed, conferences covered and contacts with colleagues developed. Companies in the field have been inquired and invited for presentations. Own experience has been gathered from different screen-film and digital mammography systems. Results and conclusions: Although there are important complementary techniques such as ultrasound and magnetic resonance imaging (MRI), X-ray mammography is still the golden standard for breast imaging. It is relatively simple and cost-effective, and it is presently the only realistic technique for screening in a large scale. It is still largely the only technique that can detect breast cancer in a pre invasive stage. Equipment for digital mammography is commercially available both with small area and full field technique (FFDM). The development of FFDM systems is now intense, as well as the development of dedicated workstations and computer-aided detection (CAD). In spite of this, the introduction of digital mammography has been very slow compared to most other X-ray examinations due to high costs and technical challenges to meet the high demands on image quality and dose in mammography as well as the demands on specialised workflow support for screening mammography and suitable display techniques. Film reading of digital mammograms has been the most common display mode so far, but to take full advantage of the digital concept, diagnostic as well as logistic, monitor reading must be applied. There is a potential of FFDM systems for significantly higher image quality or significantly lower dose than screen-film mammography (SFM), or both. Further research is necessary to fully use this potential. The investment costs are much higher for digital than screen-film mammography

  20. Mammography - recent technical developments and their clinical potential

    Energy Technology Data Exchange (ETDEWEB)

    Hemdal, Bengt; Mattsson, Soeren [Malmoe Univ. Hospital (Sweden). Dept. of Radiation Physics; Andersson, Ingvar [Malmoe Univ. Hospital (Sweden). Dept. of Diagnostic Radiology; Thilander Klang, Anne [Sahlgrenska Univ. Hospital, Goeteborg (Sweden). Dept. of Medical Physics and Biomedical Engineering; Bengtsson, Gert; Jarlman, O. [Lund Univ. Hospital (Sweden). Dept. of Diagnostic Radiology; Leitz, Wolfram [Swedish Radiation Protection Authority, Stockholm (Sweden); Bjurstam, Nils [Univ. of North Norway, Troms (Norway). Dept. of Radiology

    2002-05-01

    The recent technical developments in digital as well as screen-film X-ray mammography have been reviewed in order to evaluate their clinical potential and to analyse possible lines for future development. Material and methods: The scientific literature has been reviewed, conferences covered and contacts with colleagues developed. Companies in the field have been inquired and invited for presentations. Own experience has been gathered from different screen-film and digital mammography systems. Results and conclusions: Although there are important complementary techniques such as ultrasound and magnetic resonance imaging (MRI), X-ray mammography is still the golden standard for breast imaging. It is relatively simple and cost-effective, and it is presently the only realistic technique for screening in a large scale. It is still largely the only technique that can detect breast cancer in a pre invasive stage. Equipment for digital mammography is commercially available both with small area and full field technique (FFDM). The development of FFDM systems is now intense, as well as the development of dedicated workstations and computer-aided detection (CAD). In spite of this, the introduction of digital mammography has been very slow compared to most other X-ray examinations due to high costs and technical challenges to meet the high demands on image quality and dose in mammography as well as the demands on specialised workflow support for screening mammography and suitable display techniques. Film reading of digital mammograms has been the most common display mode so far, but to take full advantage of the digital concept, diagnostic as well as logistic, monitor reading must be applied. There is a potential of FFDM systems for significantly higher image quality or significantly lower dose than screen-film mammography (SFM), or both. Further research is necessary to fully use this potential. The investment costs are much higher for digital than screen-film mammography

  1. Dosimetry and image quality in digital mammography facilities in the State of Minas Gerais, Brazil

    Science.gov (United States)

    da Silva, Sabrina Donato; Joana, Geórgia Santos; Oliveira, Bruno Beraldo; de Oliveira, Marcio Alves; Leyton, Fernando; Nogueira, Maria do Socorro

    2015-11-01

    According to the National Register of Health Care Facilities (CNES), there are approximately 477 mammography systems operating in the state of Minas Gerais, Brazil, of which an estimated 200 are digital apparatus using mainly computerized radiography (CR) or direct radiography (DR) systems. Mammography is irreplaceable in the diagnosis and early detection of breast cancer, the leading cause of cancer death among women worldwide. A high standard of image quality alongside smaller doses and optimization of procedures are essential if early detection is to occur. This study aimed to determine dosimetry and image quality in 68 mammography services in Minas Gerais using CR or DR systems. The data of this study were collected between the years of 2011 and 2013. The contrast-to-noise ratio proved to be a critical point in the image production chain in digital systems, since 90% of services were not compliant in this regard, mainly for larger PMMA thicknesses (60 and 70 mm). Regarding the image noise, only 31% of these were compliant. The average glandular dose found is of concern, since more than half of the services presented doses above acceptable limits. Therefore, despite the potential benefits of using CR and DR systems, the employment of this technology has to be revised and optimized to achieve better quality image and reduce radiation dose as much as possible.

  2. Optimization of radiation protection in digital mammography

    International Nuclear Information System (INIS)

    Digital technologies in radiology have widely expanded and became common part of medical diagnostic process. About 10% of Slovakian radiological sites are currently using digital mammographic devices and their number is rapidly increasing. We can find the most advanced digital technologies applying CR (computer radiography) and DR displaying systems (FFDM) designed by world known manufacturers in common practice. We are expecting from new technologies not only simpler and faster diagnostics but also higher quality of diagnostic information followed by more effective treatment. In this paper optimization of radiation protection in digital mammography is discussed. (authors)

  3. A PET imaging system dedicated to mammography

    CERN Document Server

    Varela, J

    2007-01-01

    The imaging system Clear-PEM for positron emission mammography, under development within the framework of the Crystal Clear Collaboration at CERN, is presented. The detector is based on pixelized LYSO crystals optically coupled to avalanche photodiodes (APD) and readout by a fast low-noise electronic system. A dedicated digital trigger and data acquisition system is used for on-line selection of coincidence events with high efficiency, large bandwidth and negligible dead-time. The detector module performance was characterized in detail.

  4. How does age affect baseline screening mammography performance measures? A decision model

    Directory of Open Access Journals (Sweden)

    Keen James E

    2008-09-01

    Full Text Available Abstract Background In order to promote consumer-oriented informed medical decision-making regarding screening mammography, we created a decision model to predict the age dependence of the cancer detection rate, the recall rate and the secondary performance measures (positive predictive values, total intervention rate, and positive biopsy fraction for a baseline mammogram. Methods We constructed a decision tree to model the possible outcomes of a baseline screening mammogram in women ages 35 to 65. We compared the single baseline screening mammogram decision with the no screening alternative. We used the Surveillance Epidemiology and End Results national cancer database as the primary input to estimate cancer prevalence. For other probabilities, the model used population-based estimates for screening mammography accuracy and diagnostic mammography outcomes specific to baseline exams. We varied radiologist performance for screening accuracy. Results The cancer detection rate increases from 1.9/1000 at age 40 to 7.2/1000 at age 50 to 15.1/1000 at age 60. The recall rate remains relatively stable at 142–157/1000, which varies from 73–236/1000 at age 50 depending on radiologist performance. The positive predictive value of a screening mammogram increases from 1.3% at age 40 to 9.8% at age 60, while the positive predictive value of a diagnostic mammogram varies from 2.9% at age 40 to 19.2% at age 60. The model predicts the total intervention rate = 0.013*AGE2 - 0.67*AGE + 40, or 34/1000 at age 40 to 47/1000 at age 60. Therefore, the positive biopsy (intervention fraction varies from 6% at age 40 to 32% at age 60. Conclusion Breast cancer prevalence, the cancer detection rate, and all secondary screening mammography performance measures increase substantially with age.

  5. 34 CFR 76.788 - What are a charter school LEA's responsibilities under this subpart?

    Science.gov (United States)

    2010-07-01

    ... significantly expand its enrollment, the charter school LEA or its authorized public chartering agency must... enrollment, the charter school LEA must provide actual enrollment and eligibility data to the SEA at a time... until the charter school LEA provides the SEA with the required actual enrollment and eligibility...

  6. 77 FR 24690 - Exemplary Charter School Collaboration Awards; Proposed Definitions, Requirements, and Selection...

    Science.gov (United States)

    2012-04-25

    ... would be designed to encourage charter schools and non-chartered public schools or non-chartered LEAs to... schools and non-chartered public schools alike, and provide students and their parents with a range of... commensurate to the amount the States have typically provided for traditional public schools. Background:...

  7. When the "Dream" Turns into a Nightmare: Life and Death of Voyager Charter School

    Science.gov (United States)

    Karanxha, Zorka

    2013-01-01

    Purpose: This article highlights the complexity of accountability issues associated with one charter school from the charter application process, operation, and functioning of the external mechanism and the internal mechanism to hold the charter school accountable, closure of the school, and consequences of the charter school's closure on its…

  8. The Impact of an Urban Charter School Leadership Training Program on Participants

    Science.gov (United States)

    Perry, Jack Lamar

    2013-01-01

    This study explored the experiences, perspectives, and recommendations of participants in a charter school training program in order to gauge whether the training adequately prepared them for charter school leadership. Charter school leaders are prepared for leadership by university programs, non-profit programs, and charter schools themselves. A…

  9. Details from the Dashboard: Estimated Number of Public Charter Schools & Students, 2014-2015

    Science.gov (United States)

    National Alliance for Public Charter Schools, 2015

    2015-01-01

    During the 2014-15 school year, almost 500 new public charter schools opened. An estimated 348,000 additional students were attending public charter schools in the 2014-15 school year compared with the previous school year. With the addition of new charter schools and students, there are now more than 6,700 public charter schools enrolling about…

  10. Reducing ABA Litigation through Autism-Centric Charter Schools: Legally Viable or Vulnerable?

    Science.gov (United States)

    Decker, Janet R.

    2010-01-01

    A recent study discovered that charter schools designed for children with autism or "autism-centric charter schools" comprise half of the total number of charter schools designed for children with disabilities. However, these unique charter schools may be vulnerable to legal challenges because they may be violating the Individuals with…

  11. Charter for Systems Engineer Working Group

    Science.gov (United States)

    Suffredini, Michael T.; Grissom, Larry

    2015-01-01

    This charter establishes the International Space Station Program (ISSP) Mobile Servicing System (MSS) Systems Engineering Working Group (SEWG). The MSS SEWG is established to provide a mechanism for Systems Engineering for the end-to-end MSS function. The MSS end-to-end function includes the Space Station Remote Manipulator System (SSRMS), the Mobile Remote Servicer (MRS) Base System (MBS), Robotic Work Station (RWS), Special Purpose Dexterous Manipulator (SPDM), Video Signal Converters (VSC), and Operations Control Software (OCS), the Mobile Transporter (MT), and by interfaces between and among these elements, and United States On-Orbit Segment (USOS) distributed systems, and other International Space Station Elements and Payloads, (including the Power Data Grapple Fixtures (PDGFs), MSS Capture Attach System (MCAS) and the Mobile Transporter Capture Latch (MTCL)). This end-to-end function will be supported by the ISS and MSS ground segment facilities. This charter defines the scope and limits of the program authority and document control that is delegated to the SEWG and it also identifies the panel core membership and specific operating policies.

  12. Quality control in digital mammography: the noise components

    Energy Technology Data Exchange (ETDEWEB)

    Leyton, Fernando [Universidade de Tarapaca, Arica (Chile). Centro de Estudios en Ciencias Radiologicas; Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Nogueira, Maria do Socorro, E-mail: mnogue@cdtn.b [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Duran, Maria Paz [Clinica Alemana, Santiago (Chile). Dept. de Radiologia; Dantas, Marcelino, E-mail: marcelino@inb.gov.b [Industrias Nucleares do Brasil (INB), Caldas, MG (Brazil). Unidade de Tratamento de Minerios; Ubeda, Carlos, E-mail: cubeda@uta.c [Universidade de Tarapaca, Arica (Chile). Fac. de Ciencias de la Salud

    2011-07-01

    To measure the linearity of the detector and determine the noise components (quantum, electronic and structural noise) that contributed to losing image quality and to determine the signal noise ratio (SNR) and contrast noise ratio (CNR). This paper describes the results of the implementation of a protocol for quality control in digital mammography performed in two direct digital mammography equipment (Hologic, Selenia) in Santiago of Chile. Shows the results of linearity and noise analysis of the images which establishes the main cause of noise in the image of the mammogram to ensure the quality and optimize procedures. The study evaluated two digital mammography's Selenia, Hologic (DR) from Santiago, Chile. We conducted the assessment of linearity of the detector, the signal noise ratio, contrast noise ratio and was determined the contribution of different noise components (quantum, electronics and structural noise). Used different thicknesses used in clinical practice according to the protocol for quality control in digital mammography of Spanish society of medical physics and NHSBSP Equipment Report 0604 Version 3. The Selenia mammography software was used for the analysis of images and Unfors Xi detector for measuring doses. The mammography detector has a linear performance, the CNR and SNR did not comply with the Protocol for the thicknesses of 60 and 70 mm. The main contribution of the noise corresponds to the quantum noise, therefore it is necessary to adjust and optimize the mammography system. (author)

  13. MR mammography of fatty tissue necrosis

    International Nuclear Information System (INIS)

    Purpose: To evaluate MR-imaging for the differentiation of fatty necrosis (FN) of the breast. Material and methods: In 1016 MR mammographies FN was found in 13 patients aged 44 to 69 years. In all studies we used a proton-weighted fat suppressed sequence (STIR) and serial T1-weighted gradient echo sequences before and after bolus injection of Gd-DTPA, MRI was correlated to ultrasound and in 8 cases to mammographic findings. Results: All 15 FN displayed fat-isointense signal on T1-weighted and on proton-weighted, fat-suppressed sequences. They were delineated by a more or less wide rim of low signal intensity with sharp border to the center. After intravenous injection of gadopentetate dimeglumine they showed no increase of signal intensity in the centre and no increase, or only a minor increase, of the rim. Ultrasound could not distinguish FN from recurrent tumour in 6 cases. 7 FN looked like atypical cysts. Conclusion: MR-mammography is very promising in the diagnosis of FN. (orig.)

  14. Computer Aided Diagnosis in Digital Mammography

    Directory of Open Access Journals (Sweden)

    "H. Mirzaalian

    2005-08-01

    Full Text Available Introduction & Background: Breast cancer is a lead-ing cause of cancer deaths among women.Early de-tection is the most effective way to reduce mortality. Mammography is the best method for early detection. In order to improve the accuracy of interpretation of mammogram, Computer Aided Diagnosis (CAD sys-tems have been proposed. The main goal of this re-search is to implement one of the algorithms and techniques for the enhancement of mammogram for easier detection of abnormalities. Patients & Methods: In the presented algorithm, morphological methods are used first for removing artifacts. Then thresholding, labeling, and active con-tours methods are used to extract the breast region, which allow the search for abnormalities to be lim-ited to the region of the breast. Finally, Gaussian fil-ter and White Top Hat Transform is used for contrast enhancement of mammogram. This algorithm has been applied on 50 images from Mammography Im-age Analysis Society (MIAS. An expert radiologist then verified improvement on the processed images. Results and Conclusions: Implementing the presented algorithm causes easier and better interpretation of mammogram without increasing the number of false positive and false negative results. Because of the spe-cial shapes and statistical features of abnormal tex-tures, it is possible to apply pattern recognition and artificial intelligence techniques as an aid for diagnos-ing suspicious regions. Research on using some of these techniques to distinguish benign abnormalities from malignant ones is on the way.

  15. Mammography calibration facility in Medical Physics Laboratory, Malaysian Institute for Nuclear Technology Research (MINT)

    International Nuclear Information System (INIS)

    -ray quantities. The first half value layer (1st HVL) and the second half value layer (2nd HVL) of the beam are determined from the measurement. Hence the values of homogeneity coefficient are calculated from the ratio between the first half value layer and the second half value layer. RadCal measuring system traceability to the primary laboratory is ensured by means of Calibration Certificate Number MAL/01/01 issued by the International Atomic Energy Agency (IAEA) dated March 25, 2002. A close liaison with IAEA laboratory in Seibersdorf is required in the future to ensure annual traceability of the standard measuring system used for calibration in mammography in this laboratory. In addition intercomparison with other standard laboratories are important in order to ensure its traceability and its accuracy in mammography calibration. This calibration facility is established at national level mainly for providing calibration service of test tools used for quality assurance program in mammography, which is being implemented in Malaysia. Technical requirements as well as other challenges in establishing this mammography calibration facility are discussed and explained in brief in this presentation

  16. Socio-demographic determinants of participation in mammography screening

    DEFF Research Database (Denmark)

    von Euler-Chelpin, My; Olsen, Anne Helene; Njor, Sisse;

    2008-01-01

    Our objective was to use individual data on socio-demographic characteristics to identify predictors of participation in mammography screening and control to what extent they can explain the regional difference. We used data from mammography screening programmes in Copenhagen, 1991-1999, and Funen.......68-3.10) for Copenhagen and Funen, respectively. Other important predictive factors for nonparticipation were not being married and not being Danish. In conclusion, to enhance participation in mammography screening programmes special attention needs to be given to women not using other primary health care services. All...

  17. An assessment of American Indian women's mammography experiences

    Directory of Open Access Journals (Sweden)

    Faseru Babalola

    2010-12-01

    Full Text Available Abstract Background Mortality from breast cancer has increased among American Indian/Alaskan Native (AI/AN women. Despite this alarming reality, AI/AN women have some of the lowest breast cancer screening rates. Only 37% of eligible AI/AN women report a mammogram within the last year and 52% report a mammogram within the last two years compared to 57% and 72% for White women. The experiences and satisfaction surrounding mammography for AI/AN women likely are different from that of women of other racial/ethnic groups, due to cultural differences and limited access to Indian Health Service sponsored mammography units. The overall goals of this study are to identify and understand the mammography experiences and experiential elements that relate to satisfaction or dissatisfaction with mammography services in an AI/AN population and to develop a culturally-tailored AI/AN mammography satisfaction survey. Methods and Design The three project aims that will be used to guide this work are: 1 To compare the mammography experiences and satisfaction with mammography services of Native American/Alaska Native women with that of Non-Hispanic White, Hispanic, and Black women, 2 To develop and validate the psychometric properties of an American Indian Mammography Survey, and 3 To assess variation among AI/AN women's assessments of their mammography experiences and mammography service satisfaction. Evaluations of racial/ethnic differences in mammography patient satisfaction have received little study, particularly among AI/AN women. As such, qualitative study is uniquely suited for an initial examination of their experiences because it will allow for a rich and in-depth identification and exploration of satisfaction elements. Discussion This formative research is an essential step in the development of a validated and culturally tailored AI/AN mammography satisfaction assessment. Results from this project will provide a springboard from which a maximally

  18. Digital mammography and their developments; Digitale Mammografie und ihre Weiterentwicklung

    Energy Technology Data Exchange (ETDEWEB)

    Wienbeck, Susanne [Universitaetsmedizin Goettingen (Germany). Inst. fuer Diagnostische und Interventionelle Radiologie; Fischer, Uwe [Diagnostisches Brustzentrum Goettingen (Germany)

    2015-09-15

    At the present time digital mammography is a satisfactory breast diagnostic imaging in clinical as well as screening mammography in defined age groups. Nevertheless it shows beside the application of ionizing radiation in women with dense breasts limitations in the detection of non calcification breast cancers. Tomosynthesis, digital contrast-enhanced mammography and breast-CT with or without contrast media lead to better results. Especially the application of contrast media for the visualisation of the tumor angiogenesis is invariably superior to all other non-contrast imaging modalities. However, the excellent results of breast MRI will be probably accessible with none of the new procedures.

  19. Performance of clinical mammography: a nationwide study from Denmark

    DEFF Research Database (Denmark)

    Jensen, Allan; Vejborg, Ilse; Severinsen, Niels;

    2006-01-01

    sensitivity, specificity and accuracy, the latter using a receiver-operating characteristics (ROC) analysis. In 96,534 clinical mammography examinations, sensitivity was 75% and specificity 99%. The presence of at least one high volume-reading radiologist in the clinic increased accuracy (AUC = 0.91 for <1...... that clinical mammography worked best in patient populations of purely symptomatic women. Our data indicate that to increase the accuracy of clinical mammography at the community level, the presence of an experienced radiologist should be prioritized ahead of raising the clinic size....

  20. Studies Comparing Screen-Film Mammography and Full-Field Digital Mammography in Breast Cancer Screening: Updated Review

    International Nuclear Information System (INIS)

    Full-field digital mammography (FFDM) has several potential benefits as compared with screen-film mammography (SFM) in mammography screening. Digital technology also opens for implementation of advanced applications, including computer-aided detection (CAD) and tomosynthesis. Phantom studies and experimental clinical studies have shown that FFDM is equal or slightly superior to SFM for detection and characterization of mammographic abnormalities. Despite obvious advantages, the conversion to digital mammography has been slower than anticipated, and not only due to higher costs. Until very recently, some countries did not even permit the use of digital mammography in breast cancer screening. The reason for this reluctant attitude was concern about lower spatial resolution and about using soft-copy reading. Furthermore, there was a lack of data supporting improved diagnostic accuracy using FFDM in a screening setting, since two pioneer trials both showed nonsignificantly lower cancer detection rate at FFDM. The 10 studies comparing FFDM and SFM in mammography screening published so far have shown divergent and rather conflicting results. Nevertheless, there is a rapid conversion to digital mammography in breast cancer screening in many western countries. The aim of this article is to give an updated review of these studies, discuss the conflicting findings, and draw some conclusions from the results

  1. Moses as a role model in the Serbia charters after 1371 changing patterns

    Directory of Open Access Journals (Sweden)

    Vujošević Žarko

    2008-01-01

    Full Text Available The aspects of the Old Testament figure of Moses highlighted in the charters of post-Nemanjić Serbia, or under the Lazarević and Branković dynasties (1371-1459, testify to a changed attitude towards Old Testament role models. While members of the Nemanjić house such as the archbishop Sava I and the rulers Stefan of Dečani and Dušan look up to Moses as a "religious leader", a prayerful intercessor before God and a victorious warrior, all of that for the sake of the "chosen" people, the role he is assigned in the arengae of the charters issued by prince Lazar and despots Stefan Lazarević and Đurađ Branković is completely different. In the universal Christian context of the post-1371 arengae Moses figures as a "prophet" and the builder of the Tabernacle - a prefiguration of the Church, thereby epitomizing a major stage in the salvation history of humankind. The role of Moses, as well as that of David, the only other Old Testament figure still referred to in the charters of the period, has a universal ecclesiologically interpreted, significance. This new pattern of interpreting Moses implies that the ruler’s main virtue now becomes his concern for the "true faith" and the houses of God. The practice of the Nemanjićs as regards selection and interpretation of Old Testament themes is reestablished by the titular despots of the Branković dynasty. In their charters, the first part of the Bible with Moses as a popular leader reassumes a "national" character and becomes part of the ideological apparatus intended to posit the Serbs as a "New Israel".

  2. Evaluation of the Slovak national mammography QA audit and the consequences for mammography screening

    International Nuclear Information System (INIS)

    Council Directive 97/43/EURATOM establishes that member states shall ensure that practitioners and technical staff in medical practice have adequate theoretical and practical training for the purpose of radiological practices as well as relevant competence in radiation protection. This is considered as a basic aspect of optimization of medical exposure. A general background of the required level of training in radiation protection is given in Guidelines on education and training in radiation protection in medical exposures published by European Commission (116/2000/EURATOM). The aim of our paper is to refer about a new education system. Recommendation for continuing education and training is given and new techniques are implemented. The introduced quality assurance and quality control programs were realized in the framework of activities of the Committee of QA and QC in radiology under auspice of Slovak Health (authors)

  3. Does Computed Mammography Make Any Difference? A Preliminary Report on First CR Mammography Installation in IRAN

    Directory of Open Access Journals (Sweden)

    M. Fatehi

    2007-05-01

    Full Text Available Digital image acquisition using CR technology is po-tentially a cost-effective way to go filmless using the already installed x-ray systems and the same techni-cal background from the technologists' point of view. It eliminates dark room and has tremendous effect on workflow in the department. In those imaging centers where direct digital mam-mography installation is not justified, CR can be a shortcut to achieve a digital image acquisition, which is an inevitable prerequisite to filmless radiology. At the same time, superior modern technology will change image quality in a way that may also affect the radiologist's performance and the clinician's satis-faction. Although the overall improvement of breast imaging will be affected by availability of PACS and image management equipment and network, it will make benefit from CAD technology, which is one of the promising fields of actual decision-making support in medical imaging. Telemammography and consulta-tions are made easy by digital images produced by CR mammography. The experience of 220 consecutive mammography studies using CR technology will be presented in terms of pathologic findings, comparison of image quality in patients undergoing repeat or follow-up mammograms, superiority in detection of dense pa-renchyma and skin or soft tissue components, diffi-culties of microcalcification detection and artifacts, department management issues regarding archive, reproducibility, digital magnification and cost-effectiveness considering parallel CR installation for studies other than mammography and problems aris-ing from technical support by the vendor.

  4. A Discovered Ducal Seal Does Not Belong to the Incorporation Charter for the City of Krakow Solving the Mystery Using Genetic Methods.

    Science.gov (United States)

    Lech, Tomasz

    2016-01-01

    The Incorporation Charter for the city of Krakow, the former capital of Poland, is one of the most valuable documents stored in the National Archives in Krakow. The document, which was written in 1257 on parchment, grants Krakow the Magdeburg rights and regulates its legal, statutory, economic and settlement-related aspects. The Charter was placed in the National Register of the Memory of the World UNESCO programme in 2014. A ducal seal, considered to be the lost seal detached from the Incorporation Charter, was found in the sphragistic collection after nearly 500 years. Unfortunately, it was uncertain whether the seal in question was indeed the missing part of the document. The aim of the study presented below was to solve this mystery. For this purpose, the parchment on which the Incorporation Charter was written was compared with the fragment of the parchment attached to the discovered seal. The study involved the analysis of selected mitochondrial DNA sequences and additional analysis at the level of nuclear DNA using microsatellite markers in the form of 11 STR (Short Tandem Repeat) loci, to identify the species and individual whose skin had been used to make the parchment. This analysis revealed that seal and parchment was from different individuals and thereby discovered that the seal was never a part of the Incorporation Charter. The study is further an example of informative DNA preservation in cultural heritage objects. PMID:27560131

  5. Extracting information from free-text mammography reports

    OpenAIRE

    Esuli, Andrea; Marcheggiani, Diego; Sebastiani, Fabrizio

    2010-01-01

    Researchers from ISTI-CNR, Pisa, aim at effectively and efficiently extracting information from free-text mammography reports, as a step towards the automatic transformation of unstructured medical documentation into structured data.

  6. Influence of advertisement on women's attitudes toward mammography screening.

    Science.gov (United States)

    Collins, C; Davis, L S; Rentz, K; Vannoy, D

    1997-01-01

    This project represents an effort to incorporate a feminist perspective into research on mammography screening. The purpose of this study was to assess women's attitudes toward four advertisements designed to encourage mammography screening. The goal was to create awareness about women's attitudes toward mammography advertisements in order to encourage the development of more effective and responsive motivational materials. The results indicated that each ad communicated different messages about the seriousness of breast cancer and the efficacy of mammography in detecting early breast cancer. Each ad also affected women differently regarding their feelings of control over breast cancer, their perceived loss of sex appeal resulting from a breast cancer diagnosis, and their general fear of breast cancer. PMID:9384078

  7. Mammography - importance, possibilities, technical trends, current situation and perspective

    International Nuclear Information System (INIS)

    Mammography is a basic modality for the detection of early breast cancer and a prior technique for its prevention and screening in asymptomatic women population after 40 year of age. The aim of mammography is to reduce mortality in women with breast cancer. Mammography is not used only for diagnostic purpose, either, is widely used for interventional procedures as core biopsy and vacuum assisted biopsy. The authors point out a new technic such as digital mammography. The higher sensitivity and specificity should be qualified by optimalisation and standardisation of the diagnostic process, based on the integrated and interdisciplinary approach, and on the quality control. The article gives an information about the present state and perspective trends in mammodiagnostics in Slovakia. (author)

  8. Stability of the CAE of a digital mammography machine

    International Nuclear Information System (INIS)

    We analyzed the long-term reproducibility automatic exposure control (CAE) of a digital mammography machine for possible drifts and the factors that have led to changes in its baseline are discussed. (Author)

  9. Establishment of Guidance Levels in General Radiography and Mammography

    International Nuclear Information System (INIS)

    Coordinated project report IAEA ARCAL LXXV-RLA/9/048 Pilot Exercise for Developing and Setting Levels Reference in General Radiography and Mammography as a Tool for Optimizing Radiation Protection and Reduce Patient Exposure in Latin America

  10. Ultrasonography as a diagnostic method in addition to mammography

    Energy Technology Data Exchange (ETDEWEB)

    Otto, H.; Roer, E.

    1988-05-01

    By using ultrasonography in addition to mammography, experienced diagnosticians essentially enhance the safety of their diagnosis of mammary gland diseases. The same applies to gynecomastia, the condition after plastic surgery, and mastitis.

  11. Ultrasonography as a diagnostic method in addition to mammography

    International Nuclear Information System (INIS)

    By using ultrasonography in addition to mammography, experienced diagnosticians essentially enhance the safety of their diagnosis of mammary gland diseases. The same applies to gynecomastia, the condition after plastic surgery, and mastitis. (orig.)

  12. CISO: charter of integration for simulator openness

    International Nuclear Information System (INIS)

    In order to improve NPP simulators components homogeneity and reuse among projects, EDF (Electricite de France) has defined a Charter Integration for Simulator Openness. CISO, which is a set of rules and guidelines for simulator interoperability and openness, defines a static data model which must be used for any reference to the simulated installation, exchange procedures for simulation modules in a parallel environment and a standard basis for compatible communications between the simulator subsystems, CISO concentrates in interfaces and leaves open the individual choices for implementation. The prototyping phase is now completed, CISO will be put into practice for the next generation of EDF full-scale simulators, the guidelines must now enrich from experience. (author)

  13. Four Principles to Consider Before Advising Women on Screening Mammography

    DEFF Research Database (Denmark)

    Keen, John D; Juhl Jørgensen, Karsten

    2015-01-01

    This article reviews four important screening principles applicable to screening mammography in order to facilitate informed choice. The first principle is that screening may help, hurt, or have no effect. In order to reduce mortality and mastectomy rates, screening must reduce the rate of advanced...... might extend a woman's life is narrow, as many tumors that can form metastases will already have done so. Instead of encouraging screening mammography, physicians should help women make an informed decision as with any medical intervention....

  14. Diagnostic value of mammography for occult breast cancer

    International Nuclear Information System (INIS)

    Objective: To evaluate the diagnostic value of mammography in occult breast cancer. Methods: 23 cases of non- palpable breast lesions were examined with stereotactic-guided or surgical biopsy. Results: Pathological diagnosis included ductal carcinoma in sim (7), infiltrating ductal carcinoma (5), lobular carcinoma in sim (2), carcinoma simplex (3), 4 intraductal papillary carcinoma (4), scirrhous carcinoma (1), metastatic adenocarcinoma (1) in the axilla. Conclusion: Mammography is a commonly used and effective method in diagnosis of occult breast cancer. (authors)

  15. 14 CFR 212.6 - Operation of gambling junket charters.

    Science.gov (United States)

    2010-01-01

    ... (AVIATION PROCEEDINGS) ECONOMIC REGULATIONS CHARTER RULES FOR U.S. AND FOREIGN DIRECT AIR CARRIERS § 212.6..., hotel, or cruise line or its agents, from requiring prospective passengers to pay nominal...

  16. 77 FR 10543 - Wildlife and Hunting Heritage Conservation Council Charter

    Science.gov (United States)

    2012-02-22

    ... Office of the Secretary Wildlife and Hunting Heritage Conservation Council Charter AGENCY: Office of the... Secretary of Agriculture have renewed the Wildlife and Hunting Heritage Conservation Council (Council...; (8) Hunting and shooting sports outreach and education organizations; (9) Tourism, outfitter,...

  17. 78 FR 65982 - Notice of Renewal of FASAB Charter

    Science.gov (United States)

    2013-11-04

    ... From the Federal Register Online via the Government Publishing Office FEDERAL ACCOUNTING STANDARDS ADVISORY BOARD Notice of Renewal of FASAB Charter AGENCY: Federal Accounting Standards Advisory Board... continue an advisory committee to consider and recommend accounting standards and principles for...

  18. 78 FR 66801 - Motor Carrier Safety Advisory Committee; Charter Renewal

    Science.gov (United States)

    2013-11-06

    ... Federal Motor Carrier Safety Administration Motor Carrier Safety Advisory Committee; Charter Renewal AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Announcement of advisory... Committee that provides the Agency with advice and recommendations on motor carrier safety programs...

  19. Perspectivas sobre las escuelas charter: Una resena para padres de familia (Perspectives on Charter Schools: A Review for Parents). ERIC Digest.

    Science.gov (United States)

    Donahoo, Saran

    Recently, charter schools have gained popularity with parents, students, and others as alternatives to public schools, but what are charter schools and what effects are they having? This Spanish-language Digest defines charter schools and clarifies some of the administrative and legal details surrounding such schools. The Digest also lays out some…

  20. Women with abnormal screening mammography lost to follow-up

    Science.gov (United States)

    Kuo, Chia-Sheng; Chen, Guan-Ru; Hung, Shou-Hung; Liu, Yi-Lien; Huang, Kuo-Chin; Cheng, Shao-Yi

    2016-01-01

    Abstract Breast cancer has the highest incidence among all cancers for women in Taiwan. The current screening policy in Taiwan suggested a biennial mammography for all women 40 to 69 years of age. A recommendation for additional testing is recommended for women with a BI-RADS result of 0 or 4; a request made via postal mail. Approximately 20% of high-risk patients do not receive additional follow-up. Therefore, we aimed to explore the causes of these patients being lost to follow-up, despite an abnormal mammogram. Two questionnaires were designed separately according to the conceptual framework of the Health Belief Model. Study participants, women who received a screening mammography at the National Taiwan University Hospital in 2011 with a BI-RAD of 0 or 4, were interviewed via telephone. The dependent variable was receipt of follow-up or not. The analyses were performed by using χ2 tests and logistic regression models. In total, 528 women were enrolled in the study: 51.2% in BI-RADS 0 group and 56.6% in BI-RADS 4, respectively. In the BI-RADS 0 group, those patients who received a follow-up examination cited the most likely causes to be physician suggestion, health implications, and concerns regarding breast cancer. Patients who did not receive a follow-up examination cited a lack of time and a perception of good personal health as primary reasons. In the BI-RADS 4 group, those patients who received a follow-up examination cited the physician's recommendation and a recognition of the importance of follow-up examinations. Patients who did not receive a follow-up examination cited having received follow-up at another hospital and a desire for a second opinion. In the BI-RADS 0 group, multivariate analysis showed that patients with higher scores in the “perceived benefits” domain were statistically more likely to receive a follow-up examination. There was no significant difference in perceived threats, perceived barriers, action cues, or self-efficacy between

  1. Contrast-Enhanced Digital Mammography and Angiogenesis

    International Nuclear Information System (INIS)

    Angiogenesis could be a means for pouring contrast media around tumors. In this work, optimization of radiological parameters for contrast-enhanced subtraction techniques in mammography has been performed. A modification of Lemacks' analytical formalism was implemented to model the X-ray absorption in the breast with contrast medium and detection by a digital image receptor. Preliminary results of signal-to-noise ratio analysis show the advantage of subtracting two images taken at different energies, one prior and one posterior to the injection of contrast medium. Preliminary experimental results using a custom-made phantom have shown good agreement with calculations. A proposal is presented for the clinical application of the optimized technique, which aims at finding correlations between angiogenesis indicators and dynamic variables of contrast medium uptake

  2. Characterization of a mammography dosimetric phantom

    International Nuclear Information System (INIS)

    The radiologic pattern of the human breast is associated to age, genetic factors, etc, since its composition can vary from mostly adipose to variable quantities of radiologically dense tissues. A large variety of breast phantoms produced with tissue-equivalent materials are used in an attempt to simulate living organs in terms of attenuation and density of the glandular and adipose tissues visualized in radiographic images. Thus, a set of breast phantoms with semi-circular shapes of different thicknesses and elemental compositions were produced aiming to simulate glandular tissues in the range of 0 to 100 %, breast tissue-equivalent Phantom - BTE. Such phantom can be used to evaluate the Incident Air Kerma (Ki) and the Glandular Dose (Dg) delivered to the patients submitted to mammography

  3. Spectral shaping for photon counting digital mammography

    International Nuclear Information System (INIS)

    The spectral shaping properties of conventional filters have been evaluated for a photon counting digital mammography system, and the result has been compared with the theoretical spectrum from a multi-prism X-ray lens (MPL). The absorption filters and the MPL were evaluated using a theoretical model of the system which has been verified experimentally. The spectral shaping performance is quantified with the spectral quantum efficiency (SQE), calculated as the polychromatic signal-difference-to-noise ratio (SDNR) squared over the optimal monochromatic SDNR squared at the same average glandular dose. The MPL increases the SQE by 25% compared to the investigated absorption filter when compared with a Tungsten anode. This translates into a potential dose reduction of 20% at maintained SDNR

  4. X-ray source for mammography

    Science.gov (United States)

    Logan, Clinton M.

    1994-01-01

    An x-ray source utilizing anode material which shifts the output spectrum to higher energy and thereby obtains higher penetrating ability for screening mammography application, than the currently utilized anode material. The currently used anode material (molybdenum) produces an energy x-ray spectrum of 17.5/19.6 keV, which using the anode material of this invention (e.g. silver, rhodium, and tungsten) the x-ray spectrum would be in the 20-35 keV region. Thus, the anode material of this invention provides for imaging of breasts with higher than average x-ray opacity without increase of the radiation dose, and thus reduces the risk of induced breast cancer due to the radiation dose administered for mammograms.

  5. Government chartered banks step up oil and gas lending

    International Nuclear Information System (INIS)

    International government chartered banks are playing an increasingly prominent role in lending for world oil and gas development projects. The main players are the World Bank's International Finance Corp. (IFC), European Bank for Reconstruction and Development (EBRD), US Export-Import Bank, and Overseas Private Investment Corp. (OPIC). Those institutions and similar ones are the catalysts for a large number of projects in the former Soviet Union (FSU) and in other nations that are seeking to develop oil and gas resources and build processing plants, pipelines, and distribution networks. Banks also are taking a greater degree of interest in the environmental aspects of projects. In country after country, especially in the developing world, barriers to foreign investment in domestic petroleum sectors are falling. Oil and gas law reforms are under way on each continent. The paper discusses the major players, the World Bank grouped, the Romanian example, the Ex-Im Bank, OPIC, the emphasis on FSU, environmental issues, and new sources of capital in developing countries

  6. Comparative evaluation of average glandular dose and image of digital mammography and film mammography in Minas Gerais, Brazil

    International Nuclear Information System (INIS)

    Breast cancer is the most common cancer among women, and early detection is critical to its diagnosis and treatment. Mammography is the best method for breast-cancer screening and is capable of reducing mortality rates To date, the most effective method for early detection of breast cancer has been x-ray mammography for which the screen/film (SF) technique has been the gold standard. Digital mammography has been proposed as a substitute for film mammography given the benefits inherent to digital technology. The purpose of our study was to compare the technical performance of digital mammographic and screen-film mammography. A PMMA phantom with objects to simulate breast structures. For the screen/film (SF) technique the results showed that 54% mammography units did not achieve the minimum acceptable performance as far the image quality. Besides, 67% services showed inadequate performance in their processing systems, which had significant influence on the image quality. At the mean glandular dose only 44% of digital systems evaluated were compliant in all thicknesses of PMMA. The average glandular dose AGD was 90 % higher than in screen/film systems. (authors)

  7. Charte des Nations Unies et statut de la Cour internationale de justice

    CERN Document Server

    United Nations. New York. Department of Public Information

    1979-01-01

    The Charter of the United Nations was signed on 26 June 1945, in San Francisco, at the conclusion of the United Nations Conference on International Organization, and came into force on 24 October 1945. The Statute of the International Court of Justice is an integral part of the Charter.

  8. Is there a Difference Between For-Profit Versus Not-For-Profit Charter Schools?

    OpenAIRE

    Hill, Cynthia D; David Welsch

    2008-01-01

    The role of for-profit educational organizations in the predominantly public and not-for-profit K-12 U.S. schooling system is being fiercely debated across our nation. Little empirical research is available to help policy makers develop informed decisions regarding the educational value that for-profit schools provide to our students. This paper fills in part, for the first time in detail, this void. This paper uses a four year panel of charter schools from the state of Michigan and a random ...

  9. Existing data sources for clinical epidemiology: the Danish Quality Database of Mammography Screening

    Directory of Open Access Journals (Sweden)

    Langagergaard V

    2013-03-01

    Full Text Available Vivian Langagergaard,1 Jens P Garne,2 Ilse Vejborg,3 Walter Schwartz,4 Martin Bak,5 Anders Lernevall,1 Nikolaj B Mogensen,6 Heidi Larsson,7 Berit Andersen,1 Ellen M Mikkelsen7 1Department of Public Health Programs, Randers Hospital, Randers, Denmark; 2Department of Breast Surgery, Aalborg Hospital, Aalborg, Denmark; 3Diagnostic Imaging Center, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark; 4Center of Mammography, 5Department of Pathology, Odense University Hospital, Denmark; 6Department of Radiology, Ringsted Hospital, Ringsted, Denmark; 7Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark Abstract: The Danish Quality Database of Mammography Screening (DKMS was established in 2007, when screening was implemented on a nationwide basis and offered biennially to all Danish women aged 50–69 years. The primary aims of the database are to monitor and evaluate the quality of the screening program and – after years of follow-up – to evaluate the effect of nationwide screening on breast cancer-specific mortality. Here, we describe the database and present results for quality assurance from the first round of national screening. The steering committee for the DKMS defined eleven organizational and clinical quality indicators and standards to monitor the Danish breast cancer screening program. We calculated the relevant proportions and ratios with 95% confidence intervals for each quality indicator. All indicators were assessed on a national and regional level. Of 670,039 women invited for mammography, 518,823 (77.4% participated. Seventy-one percent of the women received the result of their mammography examination within 10 days of screening, and 3% of the participants were recalled for further investigation. Among all detected cancers, 86% were invasive cancers, and the proportion of women with node negative cancer was 67%. There were 36% women with small cancers, and the ratio of surgery for

  10. Conspicuity of breast cancer according to histopathological type and breast density when imaged by full-field digital mammography compared with screen-film mammography

    International Nuclear Information System (INIS)

    To compare the conspicuity of different histopathological types of breast cancer according to breast density and mammographic imaging in patients with screen-detected breast cancers undergoing both full-field digital mammography (FFDM) and screen-film mammography (SFM) in the United Kingdom National Health Service Breast Screening Programme (NHSBSP). 185 patients underwent routine screening with SFM followed by further imaging using FFDM with consequent diagnosis of breast cancer. All SFM and soft-copy FFDM images were evaluated by two readers in an independent, retrospective review. The visualisation and conspicuity of the mammographic abnormality were recorded and graded using a four-level scale. Conspicuity of breast cancer was qualitatively evaluated. Breast density and conspicuity were correlated with histopathological diagnosis and inter-observer correlation was calculated. Mixed Model ANOVA demonstrated significant differences between FFDM and SFM (p < 0.001) and breast densities (p = 0.009): conspicuity of the mammographic abnormality (p < 0.001) and visualisation of the dominant mammographic feature (p < 0.001) were significantly greater with FFDM than SFM. This held true for both readers and for all histopathological tumour types with no significant differences between each tumour type. FFDM is significantly superior to SFM for conspicuity of screen-detected breast cancers for all histopathological types and breast densities. (orig.)

  11. Conspicuity of breast cancer according to histopathological type and breast density when imaged by full-field digital mammography compared with screen-film mammography

    Energy Technology Data Exchange (ETDEWEB)

    Pinker, Katja [Medical University Vienna, Department of Radiology, Divison of Molecular and Gender Imaging, Vienna (Austria); Medical University Vienna, Department of Radiology, MR Centre of Excellence, Vienna (Austria); Perry, Nicholas [St Bartholomew' s Hospital, Breast Unit, Barts and The London Cancer Centre, London (United Kingdom); The Princess Grace Hospital, The London Breast Institute, London (United Kingdom); Vinnicombe, S.; Shiel, S. [St Bartholomew' s Hospital, Breast Unit, Barts and The London Cancer Centre, London (United Kingdom); Weber, M. [Medical University Vienna, Department of Radiology, Vienna (Austria)

    2011-01-15

    To compare the conspicuity of different histopathological types of breast cancer according to breast density and mammographic imaging in patients with screen-detected breast cancers undergoing both full-field digital mammography (FFDM) and screen-film mammography (SFM) in the United Kingdom National Health Service Breast Screening Programme (NHSBSP). 185 patients underwent routine screening with SFM followed by further imaging using FFDM with consequent diagnosis of breast cancer. All SFM and soft-copy FFDM images were evaluated by two readers in an independent, retrospective review. The visualisation and conspicuity of the mammographic abnormality were recorded and graded using a four-level scale. Conspicuity of breast cancer was qualitatively evaluated. Breast density and conspicuity were correlated with histopathological diagnosis and inter-observer correlation was calculated. Mixed Model ANOVA demonstrated significant differences between FFDM and SFM (p < 0.001) and breast densities (p = 0.009): conspicuity of the mammographic abnormality (p < 0.001) and visualisation of the dominant mammographic feature (p < 0.001) were significantly greater with FFDM than SFM. This held true for both readers and for all histopathological tumour types with no significant differences between each tumour type. FFDM is significantly superior to SFM for conspicuity of screen-detected breast cancers for all histopathological types and breast densities. (orig.)

  12. Nuclear Safety Charter; Charte Surete Nucleaire

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2008-07-01

    The AREVA 'Values Charter' reaffirmed the priority that must be given to the requirement for a very high level of safety, which applies in particular to the nuclear field. The purpose of this Nuclear Safety Charter is to set forth the group's commitments in the field of nuclear safety and radiation protection so as to ensure that this requirement is met throughout the life cycle of the facilities. It should enable each of us, in carrying out our duties, to commit to this requirement personally, for the company, and for all stakeholders. These commitments are anchored in organizational and action principles and in complete transparency. They build on a safety culture shared by all personnel and maintained by periodic refresher training. They are implemented through Safety, Health, and Environmental management systems. The purpose of these commitments, beyond strict compliance with the laws and regulations in force in countries in which we operate as a group, is to foster a continuous improvement initiative aimed at continually enhancing our overall performance as a group. Content: 1 - Organization: responsibility of the group's executive management and subsidiaries, prime responsibility of the operator, a system of clearly defined responsibilities that draws on skilled support and on independent control of operating personnel, the general inspectorate: a shared expertise and an independent control of the operating organization, an organization that can be adapted for emergency management. 2 - Action principles: nuclear safety applies to every stage in the plant life cycle, lessons learned are analyzed and capitalized through the continuous improvement initiative, analyzing risks in advance is the basis of Areva's safety culture, employees are empowered to improve nuclear Safety, the group is committed to a voluntary radiation protection initiative And a sustained effort in reducing waste and effluent from facility Operations, employees and

  13. Mammography calibration qualities establishment in a Mo-Mo clinical system

    International Nuclear Information System (INIS)

    In this study the mammography calibration qualities were established in a clinical mammography system. The objective is to provide the IPEN instruments calibration laboratory with both mammography calibration methods (using a clinical and an industrial system). The results showed a good behavior of mammography equipment, in terms of kVp, PPV and exposure time. The additional filtration of molybdenum is adequate, air-kerma rates were determined and spectra were obtained. (author)

  14. Mammography calibration qualities establishment in a Mo-Mo clinical system

    Energy Technology Data Exchange (ETDEWEB)

    Correa, E.L.; Santos, L.R. dos; Vivolo, V.; Potiens, M.P.A., E-mail: educorrea1905@gmail.com [Instituto de Pesquisas Energeticas e Nucleres (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2015-07-01

    In this study the mammography calibration qualities were established in a clinical mammography system. The objective is to provide the IPEN instruments calibration laboratory with both mammography calibration methods (using a clinical and an industrial system). The results showed a good behavior of mammography equipment, in terms of kVp, PPV and exposure time. The additional filtration of molybdenum is adequate, air-kerma rates were determined and spectra were obtained. (author)

  15. Racial and Geographic Differences in Mammography Screening in St. Louis City: A Multilevel Study

    OpenAIRE

    Lian, Min; Jeffe, Donna B.; Schootman, Mario

    2008-01-01

    To examine racial differences in mammography use and its determinants in the City of St. Louis, MO, USA, we recruited women age 40 or older using random-digit dialing to (1) examine the difference in mammography use between white women and African American women and (2) identify individual- and census-tract-level risk factors of nonadherence to mammography. During telephone interviews, we inquired about mammography use and several demographic, psychosocial, and health behavior variables. We d...

  16. 77 FR 27553 - National Charter Schools Week, 2012

    Science.gov (United States)

    2012-05-10

    ... succeed can serve as models of reform for other public schools. In an economy where knowledge is our most... Independence of the United States of America the two hundred and thirty-sixth. (Presidential Sig.) [FR...

  17. 76 FR 25525 - National Charter Schools Week, 2011

    Science.gov (United States)

    2011-05-05

    ... in a unique position to spark a dialogue with other public schools on how to organize teaching and... two hundred and thirty-fifth. (Presidential Sig.) [FR Doc. 2011-11067 Filed 5-4-11; 8:45 am]...

  18. 75 FR 24367 - National Charter Schools Week, 2010

    Science.gov (United States)

    2010-05-05

    ... communities are working together to transform our public schools, and countless children stand to benefit from.... (Presidential Sig.) [FR Doc. 2010-10730 Filed 5-4-10; 8:45 am] Billing code 3195-W0-P...

  19. The IAEA/WHO network of Secondary Standard Dosimetry Laboratories. SSDL network charter

    International Nuclear Information System (INIS)

    In 1976, the International Atomic Energy Agency (IAEA) together with the World Health Organization (WHO) established a Network of Secondary Standard Dosimetry Laboratories (SSDLs), known as the IAEA/WHO SSDL Network. This Network, through SSDLs designated by Member States, provides a direct linkage of national dosimetry standards to the international measurement system of standards traceable to the Bureau International des Poids et Mesures (BIPM), and the dissemination of S.I. quantities and units through the proper calibration of field instruments by the SSDLs. The Network has proved to be of value in improving national capabilities for instrument calibration and the awareness of better accuracy and traceability. Fifty-eight countries have nominated SSDLs for membership in the Network. Unfortunately, some of these SSDLs do not yet function as full members, perhaps because of some uncertainty as to their obligations concerning the Network. Consequently, the Scientific Committee which advises the Network Secretariat has recommended that a Charter be drawn up explaining the privileges, rights and duties of members in the Network which would strengthen their links to the international measurement system. In addition to the duties of members in the Network and the benefits that full members can receive, the Charter also describes how the Network functions and the scope of the work of the SSDLs. In producing this Charter, the advisory group has drawn heavily on the IAEA publication 'Secondary Standard Dosimetry Laboratories: Development and Trends' (1985) which summarizes the origin, development, status and prospects of the IAEA/WHO SSDL Network. The various appendices are effectively up-dates of different parts of this earlier publication, and the original drafting and reviewing bodies are given due recognition. The revisions take into account the experience the Agency has gained in coordinating the activities of the Network for more than 20 years

  20. Current components, water pressure, physical, and other data from moored current meters, pressure gauges, and CTD casts from CHARTER/FISHING BOATS and other platforms from the Bering Sea - Coastal Waters of Western Alaska and other locations from 14 May 1989 to 06 October 1989 (NCEI Accession 9000278)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Current components, water pressure, physical, and other data were collected from moored current meters, pressure gauges, and CTD casts from CHARTER/FISHING BOATS...

  1. SPECIES IDENTIFICATION - ORGANISM LENGTH, SPECIES IDENTIFICATION, WATER DEPTH, SPECIES IDENTIFICATION - LIFE STAGE and other fish examination data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-18 to 2004-11-08 (NODC Accession 0115200)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115200 includes meteorological, fish examination and biological data collected aboard the CHARTER/FISHING BOATS during cruises GP0108, GP0207-01,...

  2. ANIMALS - INDIVIDUAL - COUNTS, HABITAT, Displacement Volume, TAXONOMIC CODE and other tows and trawl data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS and MILLER FREEMAN cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-17 to 2003-08-08 (NODC Accession 0115265)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115265 includes tows, biological and trawl data collected aboard the CHARTER/FISHING BOATS and MILLER FREEMAN during cruises GP0108, GP0207-01,...

  3. HABITAT, WATER TEMPERATURE, cloud amount/frequency and WIND SPEED tows and trawl data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS and MILLER FREEMAN cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-17 to 2004-11-08 (NODC Accession 0115264)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115264 includes meteorological, tows, biological, physical and trawl data collected aboard the CHARTER/FISHING BOATS and MILLER FREEMAN during...

  4. HABITAT, WATER TEMPERATURE, SPECIES IDENTIFICATION, cloud amount/frequency and other trawl data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-18 to 2004-11-08 (NODC Accession 0115261)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115261 includes meteorological, biological, physical and trawl data collected aboard the CHARTER/FISHING BOATS during cruises GP0108, GP0207-01,...

  5. HABITAT, WATER TEMPERATURE, SPECIES IDENTIFICATION and INDIVIDUAL FISH EXAMINATION - AGE fish examination data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-18 to 2004-11-08 (NODC Accession 0115263)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115263 includes fish examination, biological and physical data collected aboard the CHARTER/FISHING BOATS during cruises GP0108, GP0207-01,...

  6. STOMACH CONTENTS - FULLNESS, WATER TEMPERATURE, STOMACH CONTENTS - PREY COUNT, SPECIES IDENTIFICATION and other fish examination data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS cruises GP0108, GP0207-01 and MF0310 as part of the NEP project from 2001-07-18 to 2003-08-08 (NODC Accession 0115262)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115262 includes biological, fish examination and physical data collected aboard the CHARTER/FISHING BOATS during cruises GP0108, GP0207-01 and...

  7. SPECIES IDENTIFICATION - ORGANISM LENGTH and SPECIES IDENTIFICATION fish examination data collected in the North Pacific Ocean on the CHARTER/FISHING BOATS cruises FR0206-01, FR0206-02 and others as part of the NEP project from 2000-05-29 to 2002-08-18 (NODC Accession 0113968)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0113968 includes biological and fish examination data collected aboard the CHARTER/FISHING BOATS during cruises FR0206-01, FR0206-02, FR0208, SE0005...

  8. CHLOROPHYLL A, SALINITY, WATER TEMPERATURE, FLUORESCENCE and SIGMA-T profile data collected in the Gulf of Alaska and North Pacific Ocean on the CHARTER/FISHING BOATS and MILLER FREEMAN cruises GP0108, GP0207-01 and others as part of the NEP project from 2001-07-17 to 2004-11-08 (NODC Accession 0113921)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0113921 includes profile, biological and physical data collected aboard the CHARTER/FISHING BOATS and MILLER FREEMAN during cruises GP0108,...

  9. WATER DEPTH, SPECIES IDENTIFICATION, SPECIES IDENTIFICATION - LIFE STAGE, species abundance and SPECIES IDENTIFICATION - WET WEIGHT trawl data collected in the North Pacific Ocean on the CHARTER/FISHING BOATS cruises FR0206-01, FR0206-02 and others as part of the NEP project from 2000-05-29 to 2002-08-18 (NODC Accession 0114641)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0114641 includes meteorological, biological and trawl data collected aboard the CHARTER/FISHING BOATS during cruises FR0206-01, FR0206-02, FR0208,...

  10. INDIVIDUAL FISH EXAMINATION - WEIGHT, SPECIES IDENTIFICATION, SPECIES IDENTIFICATION - LIFE STAGE and SPECIES IDENTIFICATION - SEX fish examination data collected in the North Pacific Ocean on the CHARTER/FISHING BOATS cruises FR0206-01, FR0206-02 and others as part of the NEP project from 2000-05-29 to 2002-08-18 (NODC Accession 0114242)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0114242 includes fish examination and biological data collected aboard the CHARTER/FISHING BOATS during cruises FR0206-01, FR0206-02, FR0208, SE0005...

  11. Predicting the risk of a false-positive test for women following a mammography screening programme

    DEFF Research Database (Denmark)

    Njor, Sisse Helle; Olsen, Anne Helene; Schwartz, Walter;

    2007-01-01

    OBJECTIVES: The objectives of this study was to provide a simple estimate of the cumulative risk of a false-positive test for women participating in mammography screening. To test the method, we used data from two well-established, organized mammography screening programmes offering biennial...... be calculated in a simple way relatively early after the start of a mammography screening programme....

  12. The Assessment of the Likelihood of Mammography Usage with Relevant Factors among Women with Disabilities

    Science.gov (United States)

    Kung, Pei-Tseng; Tsai, Wen-Chen; Chiou, Shang-Jyh

    2012-01-01

    Research that identifies the determinants of low mammography use among disabled people is scant. This study examines the determining factors related to the low usage of mammography among women with disabilities. To identify the barriers that prevent women with disabilities from participating in mammography screening can help authorities conceive…

  13. 42 CFR 413.123 - Payment for screening mammography performed by hospitals on an outpatient basis.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 2 2010-10-01 2010-10-01 false Payment for screening mammography performed by... SKILLED NURSING FACILITIES Specific Categories of Costs § 413.123 Payment for screening mammography... mammographies performed by hospitals. (b) Payment to hospitals for outpatient services. Payment to hospitals...

  14. Screening with mammography - what quality is required and how is it checked?

    International Nuclear Information System (INIS)

    The medical value of screening for breast cancer with mammography has been proved in Swedish trials, in which a 30% reduction of breast cancer mortality was observed. However, the benefits may easily be lost if the examinations are not performed in accordance with the most stringent requirements. With the prospect of general screening with mammography all over Sweden, the National Health Board and the National Institute of Radiation Protection have issued guidelines on how screening is to be organized. Far-reaching recommendations concerning X-ray equipment, film processing, radiation dose, and image quality are in preparation. The basis of these recommendations, their background and the underlying field experience are the subject of this paper. A mammographic system regarded as the optimum presently achievable serves as a reference. Comparison is made with other systems based on performance measurements of the X-ray equipment (i.e. tube voltage, radiation output, beam quality), a sensitometric evaluation, dose measurements, and image quality measurements including spatial resolution and quantitative assessment of contrast and fraction of scattered radiation. The test methods are described and the criteria for acceptance of a system are discussed. (author)

  15. Influence of Detector Radiation Damage on CR Mammography Quality Control.

    Science.gov (United States)

    Moriwaki, Atsumi; Ishii, Mie; Terazono, Shiho; Arao, Keiko; Ishii, Rie; Sanada, Taizo; Yoshida, Akira

    2016-05-01

    Recently, radiation damage to the detector apparatus employed in computed radiography (CR) mammography has become problematic. The CR system and the imaging plate (IP) applied to quality control (QC) program were also used in clinical mammography in our hospital, and the IP to which radiation damage has occurred was used for approximately 5 years (approximately 13,000 exposures). We considered using previously acquired QC image data, which is stored in a server, to investigate the influence of radiation damage to an IP. The mammography unit employed in this study was a phase contrast mammography (PCM) Mermaid (KONICA MINOLTA) system. The QC image was made newly, and it was output in the film, and thereafter the optical density of the step-phantom image was measured. An input (digital value)-output (optical density) conversion curve was plotted using the obtained data. The digital values were then converted to optical density values using a reference optical density vs. digital value curve. When a high radiation dose was applied directly, radiation damage occurred at a position on the IP where no object was present. Daily QC for mammography is conducted using an American College of Radiology (ACR) accreditation phantom and acrylic disc, and an environmental background density measurement is performed as one of the management indexes. In this study, the radiation damage sustained by the acrylic disc was shown to differ from that of the background. Thus, it was revealed that QC results are influenced by radiation damage. PMID:27211088

  16. Study of mammography in mass screening for breast cancer

    International Nuclear Information System (INIS)

    In order to examine the rate of correct diagnosis by mammography at initial mass screening for breast cancer, we carried out a retrospective study of mammography findings in 267 cases of breast cancer detected at Asahikawa Cancer Screening Center. The screening was performed by physical examination, and in cases where disease was suspected, mammography, ultrasonography, and needle biopsy were done. Mammographically, 172 cases (64.4%) were cancer-positive, 58 cases (21.7%) were suspicious for cancer, and 37 cases (13.9%) were cancer-negative. Patients below 50 years of age and those with tumors of small diameter (<20 mm) showed a significantly lower rate of cancer positivity than patients aged 50 years or more and those with tumors 20 mm or more in diameter. Mammographic abnormalities were not specific, since these changes were also found in normal subjects and patients with benign diseases. Therefore, we concluded that mammography without physical examination at initial mass screening has a high risk of missing breast cancer. Mass screening for breast cancer should be performed by physical examination involving inspection and palpation at the first instance. If any suspicious findings are obtained, mammography, ultrasonography, and needle biopsy should be done. (author)

  17. Digital breast tomosynthesis versus digital mammography: a clinical performance study

    Energy Technology Data Exchange (ETDEWEB)

    Gennaro, Gisella; Baldan, Enrica; Bezzon, Elisabetta; Polico, Ilaria; Proietti, Alessandro; Toffoli, Aida [Venetian Oncological Institute (IOV), IRCCS, Department of Radiology, Padua (Italy); Toledano, Alicia [Statistics Collaborative Inc., Washington, DC (United States); Di Maggio, Cosimo [Padua University, Department of Oncological and Surgical Sciences, Padua (Italy); La Grassa, Manuela [Aviano Oncological Reference Center (CRO), IRCCS, Department of Radiology, Aviano (Pordenone) (Italy); Pescarini, Luigi [Venetian Oncological Institute (IOV), IRCCS, Department of Radiology, Padua (Italy); Padua University, Department of Oncological and Surgical Sciences, Padua (Italy); Muzzio, Pier Carlo [Venetian Oncological Institute (IOV), IRCCS, Department of Radiology, Padua (Italy); Padua University, Department of Medical Diagnostic Sciences, Padua (Italy)

    2010-07-15

    To compare the clinical performance of digital breast tomosynthesis (DBT) with that of full-field digital mammography (FFDM) in a diagnostic population. The study enrolled 200 consenting women who had at least one breast lesion discovered by mammography and/or ultrasound classified as doubtful or suspicious or probably malignant. They underwent tomosynthesis in one view [mediolateral oblique (MLO)] of both breasts at a dose comparable to that of standard screen-film mammography in two views [craniocaudal (CC) and MLO]. Images were rated by six breast radiologists using the BIRADS score. Ratings were compared with the truth established according to the standard of care and a multiple-reader multiple-case (MRMC) receiver-operating characteristic (ROC) analysis was performed. Clinical performance of DBT compared with that of FFDM was evaluated in terms of the difference between areas under ROC curves (AUCs) for BIRADS scores. Overall clinical performance with DBT and FFDM for malignant versus all other cases was not significantly different (AUCs 0.851 vs 0.836, p = 0.645). The lower limit of the 95% CI or the difference between DBT and FFDM AUCs was -4.9%. Clinical performance of tomosynthesis in one view at the same total dose as standard screen-film mammography is not inferior to digital mammography in two views. (orig.)

  18. Comparison of TLD air kerma measurements in mammography

    International Nuclear Information System (INIS)

    The mammography examination is usually targeted at asymptomatic women so the narrow balance between benefit and undesirable effects is important. During the past few decades there have been significant advances in the equipment used for mammography. Even when the latest equipment and imaging systems are used, there is considerable variation from centre-to-centre in the choice of imaging parameters and techniques. There may be quite large differences in image quality and breast dose among the centres. A Co-ordinated Research Programme on 'Image quality and patient dose optimization in mammography in Eastern European Countries' was conducted by the IAEA, aiming at defining a methodology for the implementation of a quality assurance (QA) programme in mammography and at exercising the assessment of image quality and patient doses in a sample of hospitals in East European countries. Selected mammography clinics from Czech Republic, Hungary, Poland, Romania and Slovakia participate in the project. The teams consisted of experienced clinicians and physicists. They were supported by a group of experts (clinicians and medical physicists) from France, Italy and Spain. As an outcome of the project, improvements in these indicators (image quality and patient dose) after the implementation of the QA programme are expected. A comparison of dosimetry systems has been organized to assure that dosimetry measurements done in the frame of the project are comparable and traceable to the international measurement system. All five East European countries plus Spain took part in the exercise. The thermoluminescent (TL) method was selected for the comparison

  19. SU-E-I-64: X-Ray Coherent Scatter Mammography Simulation

    Energy Technology Data Exchange (ETDEWEB)

    Hassan, L R; MacDonald, C A [University at Albany, SUNY, Albany, NY (United States)

    2014-06-01

    Purpose: Conventional mammography has poor contrast between healthy and cancerous tissues due to the small difference in attenuation properties. Coherent scatter potentially provides more information because interference of coherently scattered radiation depends on the average intermolecular spacing, and can be used to characterize tissue types. However, typical coherent scatter analysis techniques are not compatible with rapid low dose screening modalities. Coherent scatter slot scan imaging is a novel imaging technique which provides new information with higher contrast. In this work a simulation was performed of coherent scatter slot scan imaging to assess its performance and provide system optimization. Methods: In coherent scatter imaging, the coherent scatter is exploited using a conventional slot scan mammography system with anti-scatter grids tilted at the characteristic angle of cancerous tissues. A Monte Carlo simulation was used to simulate the coherent scatter imaging. System optimization was performed across several parameters, including source voltage and filtration, tilt angle, source and grid distances, grid ratio, and shielding geometry. Results: The contrast was high and increased as the grid tilt angle was increased beyond the characteristic angle for the modeled carcinoma, and as the source voltage increased. Source filtration did not have a significant effect on contrast. Increasing grid ratio improved contrast at the expense of decreasing the signal to noise ratio (SNR). As the tumor size is decreased, additional shields to block the fat signal are necessary in order to detect the cancer signal. Conclusion: Coherent scatter analysis using a wide slot setup is promising as an enhancement for screening mammography. This work was supported by National Institutes of Health, # 7 R01EB009715.

  20. Screening mammography beliefs and recommendations: a web-based survey of primary care physicians

    Directory of Open Access Journals (Sweden)

    Yasmeen Shagufta

    2012-02-01

    Full Text Available Abstract Background The appropriateness and cost-effectiveness of screening mammography (SM for women younger than 50 and older than 74 years is debated in the clinical research community, among health care providers, and by the American public. This study explored primary care physicians' (PCPs perceptions of the influence of clinical practice guidelines for SM; the recommendations for SM in response to hypothetical case scenarios; and the factors associated with perceived SM effectiveness and recommendations in the US from June to December 2009 before the United States Preventive Services Task Force (USPSTF recently revised guidelines. Methods A nationally representative sample of 11,922 PCPs was surveyed using a web-based questionnaire. The response rate was 5.7% (684; (41% 271 family physicians (FP, (36% 232 general internal medicine physicians (IM, (23% 150 obstetrician-gynaecologists (OBG, and (0.2% 31 others. Cross-sectional analysis examined PCPs perceived effectiveness of SM, and recommendation for SM in response to hypothetical case scenarios. PCPs responses were measured using 4-5 point adjectival scales. Differences in perceived effectiveness and recommendations for SM were examined after adjusting for PCPs specialty, race/ethnicity, and the US region. Results Compared to IM and FP, OBG considered SM more effective in reducing breast cancer mortality among women aged 40-49 years (p = 0.003. Physicians consistently recommended mammography to women aged 50-69 years with no differences by specialty (p = 0.11. However, 94% of OBG "always recommended" SM to younger and 86% of older women compared to 81% and 67% for IM and 84% and 59% for FP respectively (p = p = Conclusions A majority of physicians, especially OBG, favour aggressive breast cancer screening for women from 40 through 79 years of age, including women with short life expectancy. Policy interventions should focus on educating providers to provide tailored recommendations for

  1. Speculation on improving personal dosimetry in mammography

    International Nuclear Information System (INIS)

    The increasing importance of radiation protection of the patient in diagnostic radiology has created an interest in the dose individuals receive from X-ray mammography, although this is an area where the most important aspect of protection is based on the inter comparison of machines using phantoms and standard conditions. In 1987 the ICRP established the critical quantity as being the average absorbed dose to the glandular tissue of the breast, and identified a composition of 50% adipose; 50% glandular tissue as a reference. Several authors have published experimental and monte carlo simulation resuluts to enable the determination of this quantity from output, beam quality and compressed breast thickness. Many centres, including ourselves, have studied the distribution of radiation dose on this basis. The result is however dependant on the assumption made about tissue composition. It is apparently common knowledge among pathologists and frequently mentioned in general anatomy texts, that the amount of glandular tissue is independent of breast size; that is larger breasts will have a higher adipose:glandular tissue ratio. Such a systematic variation would lead to an overestimate of the dose being received by women with larger breasts. I will review the availabe pathology and demonstrate the effect of applying the assumed breast composition on our own data. (author)

  2. Teaching atlas of mammography. 2. rev. ed.

    International Nuclear Information System (INIS)

    The purpose of this Atlas is to teach radiologists how to analyze mammograms and arrive at the correct diagnosis through proper evaluation of the findings. The illustrated cases cover practically the entire spectrum of breast abnormalities. They are based upon referred patient material as well as 80000 mammographic screening examinations. There are two basic steps in the interpretation of mammograms: perception and analysis. Since the greatest benefit of mammography lies in the detection of breast carcinoma in its earliest possible stages, every mammogram must be systematically surveyed for the subtle hints of malignancy. Perception is taught in this Atlas by describing a method for systematic viewing. The reader is then provided with a series of mammograms with obscure lesions to encourage practice with this method. With the help of a coordinate system, the lesions can be precisely located. Practice in perception continues throughout the Atlas. After detecting an abnormality on the mammogram, the diagnosis can be reached through a careful analysis of the X-ray signs. Additional projections, coned-down compression and magnetification views provide further help in this analytic workup. Rather than starting with the diagnosis and demonstrating typical findings, the approach of this Atlas is to teach the reader how to analyze the image and reach the correct diagnosis through proper evaluation of the X-ray signs. Prerequisites for the perception and evaluation of the X-ray signs are optimum technique, knowledge of anatomy and understanding of the pathological processes leading to the mammographic appearances. (orig.)

  3. MammoGrid: a mammography database

    CERN Multimedia

    2002-01-01

    What would be the advantages if physicians around the world could gain access to a unique mammography database? The answer may come from MammoGrid, a three-year project under the Fifth Framework Programme of the EC. Led by CERN, MammoGrid involves the UK (the Universities of Oxford, Cambridge and the West of England, Bristol, plus the company Mirada Solutions of Oxford), and Italy (the Universities of Pisa and Sassari and the Hospitals in Udine and Torino). The aim of the project is, in light of emerging GRID technology, to develop a Europe-wide database of mammograms. The database will be used to investigate a set of important healthcare applications as well as the potential of the GRID to enable healthcare professionals throughout the EU to work together effectively. The contributions of the partners include building the GRID-database infrastructure, developing image processing and Computer Aided Detection techniques, and making the clinical evaluation. The first project meeting took place at CERN in Sept...

  4. Digital slot scan mammography: Preliminary results

    International Nuclear Information System (INIS)

    A desirable mammographic imaging system should offer high spatial resolution, a wide dynamic range, high sensitivity to x-rays, and a means of scatter reduction. Digital acquisition would permit image enhancement and corrections for system nonuniformities. A digital mammography slot scan system under development at UCLA uses a Mo-anode x-ray tube and a detector which consists of a rare-earth x-ray screen optically coupled to a CCD camera. Spatial resolution is limited by the screen, and the dynamic range (signal-to-noise ratio) of the CCD exceeds 500 when factory-supplied circuitry is used. The slot scan format reduces scatter to less than 5% of the primary beam intensity. The optically coupled screen-CCD detector has demonstrated reasonable sensitivity to low-energy x-rays. Digital slot scan images of a Kodak breast phantom are presented which were acquired using about 20% of the mA strength needed for a film-screen unit with 5:1 grid. Detector improvements are discussed which may lower the mA requirements by an additional factor of 3. Modifications to this slot scan system are considered for general radiographic applications

  5. MRI examination on microcalcification lesions on mammography

    International Nuclear Information System (INIS)

    With a recent increase of patients who are pointed out microcalcification on mammography (MMG) but otherwise normal, we have increasingly difficulties in making diagnosis. In this paper we examined magnetic resonance imaging (MRI) findings and diagnosis of microcalcification lesions. Out of consecutive patients who visited our hospital for close exploration of calcification on MMG from July 2006 to March 2009, 124 patients who were performed MRI were enrolled in this study. The morphology and enhancement kinetics of their lesions visualized by MRI were classified with reference to the breast imaging reporting and data system (BIRADS)-MRI and were compared with outcomes of histological diagnoses. As a result, all lesions in which no abnormal enhancement was seen on MRI were benign. Malignant lesions accounted for about 80.0% in mass patterns, and about more than half in non-mass like enhancement. About 30% of the lesions were malignant in the Focus/Foci pattern which designates lesions with the size of less than 5 mm. MRI is capable of predicting whether the microcalcification lesion is malignant or benign in some degree in patients with positive findings, and we can omit Stereotactic Mammotome biopsy (ST-MTB) in those with negative findings. Accordingly MRI is considered to be an extremely useful modality. (author)

  6. 14 CFR 372.25 - Tariffs to be filed for charter trips.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 4 2010-01-01 2010-01-01 false Tariffs to be filed for charter trips. 372... § 372.25 Tariffs to be filed for charter trips. Effective October 1, 1972, a charter operator shall not... on file with the Department a currently effective tariff showing all rates, fares, and charges...

  7. For-Profit Charter Schools and Threats to the Publicness of Public Schools

    Science.gov (United States)

    Stitzlein, Sarah M.

    2013-01-01

    Media portrayals and education policies have combined with anecdotes about charter school successes to produce a favorable assessment of charter schools by two-thirds of Americans. Such media celebrations often group an array of charter school types together, thereby disguising their differences. Indeed, the public seems unaware there are…

  8. Student Achievement in Ohio Charter Schools: A Comparative and Longitudinal Study

    Science.gov (United States)

    Kotler, Ruth M.

    2012-01-01

    The purpose of this study was to investigate fifth-grade student achievement in Ohio public charter schools as compared to student achievement in traditional public schools, and to determine whether the performance of charter schools changed over time. Research questions asked 1) how does student achievement in Ohio's public charters compare…

  9. Charter Schools: A Welcome Choice for Parents. WebMemo. No. 2996

    Science.gov (United States)

    Richwine, Jason

    2010-01-01

    A study published by the Department of Education (DOE) in June, "The Evaluation of Charter School Impacts," highlights the many benefits of charter schools. The results show unambiguously that parents are substantially more satisfied with charter schools and the academic and social development of their children who attend compared to public school…

  10. 7 CFR 25.502 - Nominations by State-chartered economic development corporations.

    Science.gov (United States)

    2010-01-01

    ... AND ENTERPRISE COMMUNITIES Special Rules § 25.502 Nominations by State-chartered economic development corporations. Any rural area nominated by an economic development corporation chartered by a State and... 7 Agriculture 1 2010-01-01 2010-01-01 false Nominations by State-chartered economic...

  11. Achievement and Attainment in Chicago Charter Schools: A Summary. Research Brief

    Science.gov (United States)

    Booker, Kevin; Gill, Brian; Zimmer, Ron; Sass, Tim R.

    2008-01-01

    Chicago's "multi-grade" charter high schools (those that include middle school grades) appear to be increasing students' rates of graduation and college entry. The overall performance of Chicago's charter schools in raising student test scores is approximately on par with that of traditional public schools in Chicago. Charter schools in Chicago…

  12. 12 CFR 614.4080 - Loans and chartered territory-banks for cooperatives.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Loans and chartered territory-banks for cooperatives. 614.4080 Section 614.4080 Banks and Banking FARM CREDIT ADMINISTRATION FARM CREDIT SYSTEM LOAN POLICIES AND OPERATIONS Chartered Territories § 614.4080 Loans and chartered territory—banks...

  13. 78 FR 53426 - United States Travel and Tourism Advisory Board Charter Renewal

    Science.gov (United States)

    2013-08-29

    ... International Trade Administration United States Travel and Tourism Advisory Board Charter Renewal AGENCY... Services Administration, renewed the Charter for the United States Travel and Tourism Advisory Board on August 19, 2013. DATES: The Charter for the United States Travel and Tourism Advisory Board was...

  14. 14 CFR 294.3 - General requirements for Canadian charter air taxi operators.

    Science.gov (United States)

    2010-01-01

    ... air taxi operators. 294.3 Section 294.3 Aeronautics and Space OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS) ECONOMIC REGULATIONS CANADIAN CHARTER AIR TAXI OPERATORS General § 294.3 General requirements for Canadian charter air taxi operators. A Canadian charter air taxi operator...

  15. The Influence of Finance and Accountability Policies on Location of New York State Charter Schools

    Science.gov (United States)

    Bifulco, Robert; Buerger, Christian

    2015-01-01

    This article identifies a set of location incentives created by New York's charter school financing and accountability provisions. We then use regression models to examine the location of charter schools across and within districts. We find that charter schools (1) are significantly more likely to locate in districts with high operating expenses…

  16. Special Education in American Charter Schools: State Level Policy, Practices, and Tensions.

    Science.gov (United States)

    Rhim, Lauren Morando; McLaughlin, Margaret J.

    2001-01-01

    States Project SEARCH, a three year qualitative study of special education in U.S. charter schools, revealed a fundamental gap between the individualized, autonomous nature of charter schools and regulated nature of special education. Notes this is complicated by some charter schools' inability to amass fiscal/human capacity to meet individual…

  17. 12 CFR 747.403 - Notice of intent to suspend or revoke charter; notice of suspension.

    Science.gov (United States)

    2010-01-01

    ... 12 Banks and Banking 6 2010-01-01 2010-01-01 false Notice of intent to suspend or revoke charter... to suspend or revoke charter; notice of suspension. (a) Upon its determination that one or more of... a notice of intent to suspend or revoke charter and of intent to place into involuntary...

  18. Bi-directional x-ray phase-contrast mammography.

    Directory of Open Access Journals (Sweden)

    Kai Scherer

    Full Text Available Phase-contrast x-ray imaging is a promising improvement of conventional absorption-based mammography for early tumor detection. This potential has been demonstrated recently, utilizing structured gratings to obtain differential phase and dark-field scattering images. However, the inherently anisotropic imaging sensitivity of the proposed mono-directional approach yields only insufficient diagnostic information, and has low diagnostic sensitivity to highly oriented structures. To overcome these limitations, we present a two-directional x-ray phase-contrast mammography approach and demonstrate its advantages by applying it to a freshly dissected, cancerous mastectomy breast specimen. We illustrate that the two-directional scanning procedure overcomes the insufficient diagnostic value of a single scan, and reliably detects tumor structures, independently from their orientation within the breast. Our results indicate the indispensable diagnostic necessity and benefit of a multi-directional approach for x-ray phase-contrast mammography.

  19. Diagnostic Invasiveness and Psychosocial Consequences of False-Positive Mammography

    DEFF Research Database (Denmark)

    Heleno, Bruno M.; Siersma, Volkert Dirk; Brodersen, John

    2015-01-01

    of a cohort study of 454 womenwith abnormal screening mammography and 908 matched control women withnormal results. Using a condition-specific questionnaire (Consequences of Screening in Breast Cancer), we assessed 12 psychosocial consequences at 5 time points (0, 1, 6, 18, and 36 months after final diagnosis......) and compared the 2 groups of women with false-positives (invasive and noninvasive management groups). RESULTS: Among the 252 women with false-positive mammography eligible forthis study, psychosocial consequences were similar for those managed invasivelyand those managed noninvasively during the 36 months...... between those of women withnormal mammography and those of women determined to have breast cancer. CONCLUSIONS: We found no evidence that use of more invasive diagnosticswas associated with worse psychosocial consequences. It is therefore reasonableto pool subgroups of women with false...

  20. Low cost breast phantom prototype for quality control mammography

    International Nuclear Information System (INIS)

    A low cost breast phantom prototype for quality control in mammography was designed and built. The phantom was formed by acrylic and wax rectangular plates. Several pieces were inserted in order to simulated fibers, micro-calcifications and tumor masses, and to assessment the spatial and contrast resolutions. Different quality control imaging tests were carried out in 3 mammography equipment in clinical use comparing the home-made phantom with a commercial phantom. The results showed that our prototype can be used for mammography quality control according to the Brazilian guideline (regulation 453/98). The aim of this work is propose a low cost breast phantom for a future use in Brazilian hospitals. (author)

  1. Digital mammography: tradeoffs between 50- and 100-micron pixel size

    Science.gov (United States)

    Freedman, Matthew T.; Steller Artz, Dorothy E.; Jafroudi, Hamid; Lo, Shih-Chung B.; Zuurbier, Rebecca A.; Katial, Raj; Hayes, Wendelin S.; Wu, Chris Y.; Lin, Jyh-Shyan; Steinman, Richard M.; Tohme, Walid G.; Mun, Seong K.

    1995-05-01

    Improvements in mammography equipment related to a decrease in pixel size of digital mammography detectors raise questions of the possible effects of these new detectors. Mathematical modeling suggested that the benefits of moving from 100 to 50 micron detectors were slight and might not justify the cost of these new units. Experiments comparing screen film mammography, a storage phosphor 100 micron digital detector, a 50 micron digital breast spot device, 100 micron film digitization and 50 micron film digitization suggests that object conspicuity should be better for digital compared to conventional systems, but that there seemed to be minimal advantage to going from 100 to 50 microns. The 50 micron pixel system appears to provide a slight advantage in object contrast and perhaps in shape definition, but did not allow smaller objects to be detected.

  2. Bone marrow and thyroid absorbed doses from mammography

    International Nuclear Information System (INIS)

    Breast dose from mammography has been estimated by various investigators, because of the established effectiveness of mammography in early screening for breast cancer and the relatively high sensitivity of the breast to radiation carcinogenesis. Nevertheless, to our knowledge, there is no available information in the literature about absorbed doses from mammography to organs other than the breast. The absorbed doses to the red bone marrow in the sternum and to the thyroid, due to scattered radiation from mammographic examinations, have been measured using a Plexiglas upper-body phantom and thermoluminescent dosemeters. Their dependence on several parameters has also been examined. It is necessary to emphasize that this work is still in progress. (author)

  3. Analysis of mammography: a blind interpretation of BCDDP radiographs

    International Nuclear Information System (INIS)

    An ROC curve analysis of mammography is presented. This study is based on a blind interpretation of radiographs of patients who underwent screening during the Oklahoma Breast Cancer Detection Demonstration Project (BCDDP). In particular, the accuracy of mammography based on 38 incidence cancer cases was evaluated. Using 40 normal subjects, a sensitivity of 72% was attained at a 28% false positive rate. The contribution of viewing radiographs of both breasts (right and left) simultaneously as compared with viewing radiographs of the individual breasts singly was also evaluated. When mammograms of the two breasts were compared, the false positive rate was lower. These results can be used to assess various screening strategies and to yield a more realistic accuracy estimate of mammography on a rescreened population than is currently available

  4. Physical image quality of computed radiography in mammography system

    International Nuclear Information System (INIS)

    Full-text: Mammography is a screening procedure that mostly used for early detection of breast cancer. In digital imaging system, Computed Radiography is a cost-effective technology that applied indirect conversion detector. The paper presents physical image quality parameter measurements namely modulation transfer function (MTF), normalized noise power spectrum (NNPS) and detective quantum efficiency (DQE) of Computed Radiography in mammography system. MTF was calculated from two different orientations of slanted images of an edge test device and NNPS was estimated using flat-field image. Both images were acquired using a standard mammography beam quality. DQE was determined by applying the MTF and NNPS values into our developed software program. Both orientations have similar DQE characteristics. (author)

  5. Does health status influence intention regarding screening mammography?

    International Nuclear Information System (INIS)

    We analyzed information surveyed from a community-based sample of Korean women older than 40 years of age to understand the relationships between health status and screening behavior. In a cross-sectional population-based study, a two-stage, geographically stratified household-based sampling design was used for assembly of a probability sample of women aged 40-69 years living in Gunpo in Korea, resulting in a total sample size of 503 women. The primary outcome variable for this analysis was the respondent's intention to obtain a mammogram. Predictor variables included health status and other factors known to influence the use of cancer screening, such as age, education, income, marital status and the presence of co-morbid illnesses. Health status was assessed by using the EuroQol (EQ-5D). The median EQ visual analogue scale score was 75.0, ranging from 20 to 100. In bivariate analyses, the percentage of women reporting to have intention toward mammography use decreased with worsening health status. Women who had problems with mobility or anxiety/depression showed lower intention to undergo future screening mammography. Multivariate logistic regression confirmed that health status was significantly associated with intention toward mammography use. Anxiety or depression was an independent predictor of future screening mammography use. Health status is significantly associated with intention regarding screening mammography use. Physicians or other health professionals should be aware that health status is an important component for health promotion, and should pay more attention to clients' possible vulnerability in screening mammography use due to their poor health status. (author)

  6. Toward a post-Charter health promotion.

    Science.gov (United States)

    Labonté, Ronald

    2011-12-01

    The past 25 years have seen enormous shifts in the environmental, political, economic and social landscapes that condition people's abilities to be healthy. Climate change is now a reality. China, India, Brazil and other 'developing' countries are emerging as new axes of political and economic power. Global capitalism has become increasingly predatory and crisis ridden, a result of unregulated and irresponsible greed of unimaginable scale. The elite response has been the increased erosion of the health and other social protection policies of redistribution that characterized the first-world run-up to the Ottawa Charter. These new realities challenge health promoters in ways unforeseen a quarter century ago. It is imperative that local determinants of health, to which health promoters give their attention, be traced to broader, even global levels of determinants. Support for groups acting at these levels should become a fundamental practice tenet. So, too, should advocacy for the social state, in which progressive taxation and hefty social investment blunt the health inequalities created by unfettered markets. As environmental and economic insecurities and inequalities increase in many of the world's countries, so does the risk of xenophobia and conflict. The roots of racism are complex; but weeding them out becomes another health promotion practice of the new millennium. There are some hopeful signs of health promoting political change, much of it emanating now from countries in the global South; but the threat of a return to health behaviourism in the face of the new global pandemic of chronic disease is real and must be confronted. PMID:22080072

  7. Which Phantom Is Better for Assessing the Image Quality in Full-Field Digital Mammography?: American College of Radiology Accreditation Phantom versus Digital Mammography Accreditation Phantom

    OpenAIRE

    Song, Sung Eun; Seo, Bo Kyoung; Yie, An; Ku, Bon Kyung; Kim, Hee-Young; Cho, Kyu Ran; Chung, Hwan Hoon; Lee, Seung Hwa; Hwang, Kyu-won

    2012-01-01

    Objective To compare between the American College of Radiology (ACR) accreditation phantom and digital mammography accreditation phantom in assessing the image quality in full-field digital mammography (FFDM). Materials and Methods In each week throughout the 42-week study, we obtained phantom images using both the ACR accreditation phantom and the digital mammography accreditation phantom, and a total of 42 pairs of images were included in this study. We assessed the signal-to-noise ratio (S...

  8. Minimizing misclassification of hormone users at mammography screening

    DEFF Research Database (Denmark)

    Njor, Sisse Helle; Pedersen, Anette Tønnes; Schwartz, Walter;

    2009-01-01

    The aim of the study was to retrospectively determine the impact of comparing current mammograms with prior mammograms on risk of misclassification especially for hormone users. Data on mammography screening were retrieved for 1993-2005 from Fyn, Denmark. At first screen, two projections were made...... of HT. The study indicated that misclassification at screening mammography in current users of HT can be reduced considerably, when the screening mammograms are viewed with the mammograms taken 4 years earlier. It should be stressed that these results come from a single clinic, and replication in other...

  9. Overdiagnosis in organised mammography screening in Denmark. A comparative study

    DEFF Research Database (Denmark)

    Jørgensen, Karsten J; Zahl, Per-Henrik; Gøtzsche, Peter C

    2009-01-01

    BACKGROUND: Overdiagnosis in cancer screening is the detection of cancer lesions that would otherwise not have been detected. It is arguably the most important harm. We quantified overdiagnosis in the Danish mammography screening programme, which is uniquely suited for this purpose, as only 20......% of the Danish population has been offered organised mammography screening over a long time-period. METHODS: We collected incidence rates of carcinoma in situ and invasive breast cancer in areas with and without screening over 13 years with screening (1991-2003), and 20 years before its introduction (1971...

  10. Dosimetry in a torso phantom during a mammography

    International Nuclear Information System (INIS)

    Two dosimetric magnitudes, the absorbed dose and the kerma in air to the entrance of torso have been determined. These dosimetric magnitudes are due to the radiation that is dispersed in the mammary gland when the patient undergoes a mammography study. The kerma to the entrance of the torso and the absorbed dose by the torso was obtained in a phantom of paraffin and with thermoluminescent dosemeters of ZrO2. The dosemeters were placed on the surface of the torso phantom while the mammography was carried out. (author)

  11. Mammography screening on healthy women - advantages and disadvantages

    International Nuclear Information System (INIS)

    Studies from USA, the Netherlands and Sweden demonstrate that mamography screening reduces breast cancer mortality in women aged 50 to 74. Younger women do not profit. The results of mammography screening has never been compared with those of an organized health education programme for promoting self examination. The sensitivity, specificity, and predictive value of mammography for screening purpose must be scrutinized. The consequences of false positive tests are at best anxiety, at worst needless breast operations. An estimate of such consequences for the female population in Oslo is presented

  12. Digital mammography with PCR: experience with 20 000 patients

    International Nuclear Information System (INIS)

    The Mammography Unit at Leeds General Infirmary is a referral center for symptomatic or at risk patients. Digital mammography was introduced in 1994, and the whole service now runs on digital imaging. PCR provides the high-quality input required, but the service could easily be adapted to any digital input that meets the required quality standards. PCR shows everything that can be seen on conventional screen-film mammograms at a comparable dose, and is sometimes better, particularly in the case of dense breasts. Because the technique is rapid, convenient and standardized, an identical high-quality imaging service is assured for all patients. (orig.)

  13. Soft Copy versus Hard Copy Reading in Digital Mammography

    OpenAIRE

    Obenauer, Silvia; Hermann, Klaus-Peter; Marten, Katharina; Luftner-Nagel, Susanne; von Heyden, Dorit; Skaane, Per; Grabbe, Eckhardt

    2003-01-01

    The objective of this study was to compare soft copy reading at a mammography work station with hard copy reading of full-field digital mammographic images. Mammograms of 60 patients (n = 29 malignant, n = 31 benign) performed with full-field digital mammography (Senographe 2000D, GE, Buc, France) were evaluated. Reading was performed based on hard copy prints (Scopix, Agfa, Leverkusen, Germany) and on 2 k × 2.5 k high-resolution monitors (Sun Ultra 60, Sun Microsystems, Palo Alto, California...

  14. Image quality and patient dose optimization in mammography in Romania

    International Nuclear Information System (INIS)

    Mammography for breast cancer detection is a major public health intervention. Experience shows that suitable performance can only be achieved through adherence to Quality Assurance (QA) guidelines. Since mammography is usually targeted to asymptotic women, the narrow balance between benefit and undesirable effects is dependent on programme quality. The work is part of a Co-ordinated Research Programme on Image quality and patient dose optimisation in Eastern European Countries of the International Atomic Energy Agency in Vienna, carried out during 1999 to 2001

  15. Individual doses for women undergoing screening mammography examinations in Poland in 2007

    International Nuclear Information System (INIS)

    Exposure doses to women undergoing screening mammography examinations should be kept as low as reasonably achievable, but they should ensure high enough image quality for adequate diagnosis. The aim of this study was to estimate the radiation risk according to the 'European guidelines for quality assurance in breast cancer screening and diagnosis', fourth edition (European Commission 2006). Materials for this study were obtained from data from 250 screening mammography facilities in Poland. For every mammography facility, a standard average glandular dose for routine exposure was calculated. Furthermore, average glandular doses for individual mammography examinations obtained according to the methods proposed by Dance et al (2000 Phys. Med. Biol. 45 3225–40) were calculated. The average glandular doses determined for 250 mammography facilities ranged from 0.12 to 14.56 mGy (the mean values ranged from 0.62 to 4.53 mGy). Only for 39 mammography facilities were all exposures found to be below the acceptable level for an average glandular dose, and for only 18 mammography facilities did no exposures exceed the achievable levels for an average glandular dose. Average glandular doses to women undergoing mammography screening attained unnecessary high values, and they were found to depend on the technical parameters of the mammography equipment and maintenance of mammography units by personnel in various mammography facilities.

  16. Eighteen cases of small breast cancer: a comparative study of mammography, CT scan and pathology

    International Nuclear Information System (INIS)

    Objective: To improve the early diagnosis of breast cancer through a study of the mammography and CT findings of small breast cancer. Methods: The mammography and CT findings of 18 cases of small breast cancer (φ≤2.0 cm in diameter) were studied and compared with pathological results. Results: The diagnostic accuracy of CT and mammography was 83% and 61%, respectively. There was a statistical difference between both modalities (P<0.05), CT scan was superior to mammography. However, there was no difference between them when assessing the lesion arising in F-type breast. In detecting breast fine cluster of calcification, the sensitivity of mammography was better than CT scan. Conclusion: The patient suspected of small breast cancer should take mammography as the first evaluation. CT scan is reserved for the further investigation. The mammography combined with CT scan can improve the early diagnostic rate of breast cancer

  17. Performance of diagnostic mammography differs in the United States and Denmark

    DEFF Research Database (Denmark)

    Jensen, Allan; Geller, Berta M; Gard, Charlotte C;

    2010-01-01

    Diagnostic mammography is the primary imaging modality to diagnose breast cancer. However, few studies have evaluated variability in diagnostic mammography performance in communities, and none has done so between countries. We compared diagnostic mammography performance in community-based settings...... imaging workup's final assessment to determine sensitivity, specificity and an estimate of accuracy: area under the receiver-operating characteristics (ROCs) curve (AUC). Diagnostic mammography had slightly higher sensitivity in the United States (85%) than in Denmark (82%). In contrast, it had higher......, Danish mammography facilities specialize in either diagnosis or screening, possibly leading to greater diagnostic mammography expertise in facilities dedicated to symptomatic patients. Performance of community-based diagnostic mammography settings varied markedly between the 2 countries, indicating that...

  18. Survey of breast cancer screening by mammography. Results of a questionnaire sent to local self-governing bodies

    International Nuclear Information System (INIS)

    In order to grasp the current status of breast cancer screening in Japan, a questionnaire was distributed to all local self-governing bodies (LSGB). The results indicated that breast cancer screening with mammography was performed by 97.9% of LSGB. Breast cancer screening was started for women aged less than 40 years at 11.9% of the LSGB, and from 40 years of age at 86.8%. Breast cancer screening for women aged 30-39 years was performed at 51.2% of the LSGB. The proportions of studies involving palpation, mammography, and ultrasonography (US) were 34.0%, 24.5%, and 41.6%, respectively. The coverage of screening invitations between April 2006 and March 2007 was grasped at 94.7% of LSGB. At 23.2%, the coverage was less than 10%, and at 33.8% was 10-19.9%. At 7.1%, the coverage was 50% or more. The national average for coverage was 10%, and was especially low in large cities. The recall rate for LSBG between April 2006 and March 2007 was 85.2%. At 22.4% of the LSBG, recall rates were less than 5%, and at 15.6% the recall rates were 50% or more. Screening mammography for women aged 30-39 years needs to be examined in the future. When recall rates exceed 20%, it is necessary to re-examine the accuracy management of breast cancer screening. (author)

  19. Quality control methodology and implementation of X-radiation standards beams, mammography level, following the standard IEC 61267

    International Nuclear Information System (INIS)

    In this work it was developed and applied a quality control program of the X radiation system (160 kV, constant potential, target of tungsten) of the Calibration Laboratory of IPEN(LCI) in the energy range relative to mammography beams (from 25 kV to 35 kV). The X radiation standards beams, level mammography, using molybdenum and aluminum as additional filtration, were established after the application of this quality control program following national and international recommendations. The reference ionization chamber has traceability to PTB and was regularly submitted to quality control tests for evaluation and analysis of its performance. The radiation qualities emerging from the X-radiation assembly (RQR-M), based on a phantom made up of an aluminum added filter (RQA-M), narrow beam condition (RQN-M) and broad beam condition (RQB-M), following the recommendations of the international standard IEC 61267 (2005) and the IAEA code of practice, TRS 457 (2007) were established. For the implantation of RQN-M and RQB-M radiation qualities, two mammography phantoms were developed. The half-value layers found are those presented by the German primary laboratory PTB, and varied from 0.35 to 1.21 mm Al. The air kerma rates were obtained for all the 15 implanted qualities. (author)

  20. Film-Screen Mammography versus digital storage plate mammography: Hard copy and monitor display of microcalcifications and focal findings - A retrospective clinical and histologic analysis

    International Nuclear Information System (INIS)

    Purpose: A retrospective clinical-histological study to determine the diagnostic accuracy of mammography using conventional screen-film cassettes (hard copy), high-resolution digital phosphor storage plates (hard copy) and monitor display (soft copy) for microcalcifications and focal lesions (BI-RADSTM category 4 or 5). Materials and methods: From April to November 2001, 76 patients underwent conventional film-screen mammography and, after diagnosis and preoperative wire localization, digital mammography with the same exposure parameters. Five investigators retrospectively determined the diagnosis after the operation from randomly distributed mediolateral views (hard-copy reading) and from the monitor display (soft-copy reading). These results were correlated with the final histology. Results: The accuracy of conventional screen-film mammography, digital mammography and monitor-displayed mammography was 67%, 65% and 68% for all findings, (n = 76), 59%, 59% and 68% for microcalcifications (n = 44) and 75%, 72% and 63% for focal lesions (n = 32). The overall results showed no difference. Conclusions: Our findings indicate equivalence of conventional screen-film mammography, high-resolution digital phosphor storage plate mammography and monitor-displayed mammography. (orig.)

  1. Dedicated mammography: Imaging with monochromatic X-rays and a clinical mammography unit

    International Nuclear Information System (INIS)

    The aim of the current studies is to implement monochromatic X-rays on a conventional diagnostic mammography unit for the improvement of image quality and/or the reduction of radiation dose. The experimental setup consists of a conventional mammography unit with monochromator module mounted at the exit of the X-ray tube and a digital linear array detector instead of the screen-film system for image acquisition. The heart of the monochromator module is a curved HOPG (highly oriented pyrolytic graphite) crystal and a slit collimator. The monochromator is adjusted to 17.5 keV (Kα-emission line of the Mo-anode). For image acquisition the object moves through the X-ray beam, which is fixed in space and directed on the detector (12 bit sensitivity, operated at 54 μm resolution). The final images were reconstructed from the measured images, a reference image and the detector background. Lead calibration grids, a contrast detail phantom and gadolinium (Gd) or iodine (I) containing contrast media were investigated. The exposure dose was measured. The results reveal that only the 17.5 keV Kα-emission line of the Mo-anode passes the monochromator while the Kβ-emission line and the bremsstrahlung spectrum are rejected. The photon flux is considerably lower for monochromatic than for polychromatic X-rays under identical geometric conditions but sufficient to investigate 5 cm thick objects. The contrast response functions (CRF) for polychromatic and monochromatic X-rays are very similar while contrast values are in favor of the monochromatic illumination. In comparison to polychromatic X-rays, the 17.5 monochromatic X-rays lead to higher contrast for Gd or I containing contrast media. Monochromatic imaging has a high potential in diagnostic mammography: image contrast is improved and radiation dose can be reduced in comparison to polychromatic imaging. For clinical installation, high-power X-ray tubes are mandatory and the imaging procedure should be adapted to the slot

  2. News media coverage of a women's health contraversy: how newspapers and TV outlets covered a recent debate over screening mammography.

    Science.gov (United States)

    Steele, Whitney Randolph; Mebane, Felicia; Viswanath, K; Solomon, Janice

    2005-01-01

    Over the past decade, there have been several highly visible debates about mammography that have captured professional, public and media attention. This paper looks at newspaper and television news coverage of a controversial research letter in The Lancet by Gøtzsche and Olsen (2001) that concluded that screening mammography did not prevent deaths from breast cancer. The news pieces examined for this project were published between October 2001 and March 2002 in one of eight U.S. newspapers or aired on one of six national or cable news networks. The six-month period was divided into one-week segments; the numbers of articles published or stories aired in each week were graphed to examine patterns. Each newspaper article and television transcript was then reviewed to identify its main content area and the amount of coverage for each major event was quantified. The highest number of newspaper articles appeared to result from several events during the end of January through the beginning of February. These events included the publication of another meta-analysis of mammography that disputed the original letter's conclusion and a full-page New York Times advertisement paid for by major medical organizations stating their continued support for mammography. The greatest amount of television news coverage was devoted to the announcement of the official federal guidelines by the Secretary of Health and Human Services in late February. We conclude by discussing how the flow of news coverage of medical controversies can potentially impact the actions and reactions of the public, the medical community and health policy makers. PMID:15970577

  3. The accuracy of digital breast tomosynthesis compared with coned compression magnification mammography in the assessment of abnormalities found on mammography

    International Nuclear Information System (INIS)

    Aim: To compare the diagnostic accuracy of the digital breast tomosynthesis (DBT) with coned compression magnification mammography (CCMM). Materials and methods: The study design included two reading sessions completed by seven experienced radiologists. In the first session, all readers read bilateral standard two-view mammograms and a CCMM view of the lesion before giving a combined score for assessment. In the second session, readers read bilateral standard two-view mammograms plus one-view DBT. The two reading sessions of the experiment were separated by at least 2 weeks to reduce the chance of reader memory of the images read in the previous session from influencing the performance in the subsequent session. Results: Three hundred and fifty-four lesions were assessed and receiver-operative characteristic (ROC) analysis was used to evaluate the difference between the two modes. For standard two-view mammography plus CCMM, the area under the curve (AUC) was 0.87 [95% confidence interval (CI): 0.83–0.91] and for standard two-view mammography plus DBT the AUC was 0.93 (95% CI: 0.91–0.95). The difference between the AUCs was 0.06 with p-value of 0.0014. Conclusion: Two-view mammography with one-view DBT showed significantly improved accuracy compared to two-view mammography and CCMM in the assessment of mammographic abnormalities. These results show that DBT can be used effectively in the further evaluation of mammographic abnormalities found at screening and in symptomatic diagnostic practice. - Highlights: • Diagnostic accuracy of magnification mammography and digital breast tomosynthesis. • There is statistical difference between CCMM and DBT. • DBT has a role in evaluating mammographic abnormalities

  4. Image Quality in Screening Mammography in Croatia

    International Nuclear Information System (INIS)

    Mortality reduction through screening mammography (SMG) is possible only with examination of high image quality (IQ), which should be performed with acceptable patient breast radiation dose (BRD). Besides film processing control, equipment assessment with breast phantom and dosimetry, periodical external mammographic IQ assessment (MIQA) is needed, including image labelling (L), breast positioning (BP), exposure (EX) and artefacts (AR) assessment. The nationwide breast cancer screening program (NBSP) has been introduced in Croatia in 2006, and the MIQA is initiated as the first step in establishing quality assurance/quality control (QA/QC) framework in breast imaging in Croatia. The current study was aimed: (1) to provide objective evidence about the technical MIQ in NBSP in Croatia, (2) to compare MIQ between different types of mammographic units (MUs), (3) to identify the common deficiencies, and (4) to propose corrective activities. Mammograms (MGs) for IQA were collected from a total of 84 MUs which participate in NBSP, which represents 70 % of all MUs nationwide: A total of 420 MG examinations were reviewed. Each MU was requested to submit ''what they consider to be their five best representative MGs, each one performed in one of five consecutive workdays''. Mean age of MG machines was 7.76 years (range 2 - 21), with no difference between four MU types. This very first study of MIQ in Croatia corroborated our intuitive impression of inadequate IQ, staff training and equipment in many MUs nationwide. As MIQ strongly influences BC detection rate, suboptimal QA/QC always carries a risk to compromise the success of NBSP. Deficiencies in SMG, especially in ID and BP reflect different level of competency of radiological staff in Croatia. Differences in MIQ in various MU types are determined by their organization, equipment, education, working habits and motivation. More efforts are needed to train both RTs and radiologists to implement and maintain QA/QC in their

  5. Positron Emission Mammography with Multiple Angle Acquisition

    International Nuclear Information System (INIS)

    Positron emission mammography (PEM) of F-18 fluorodeoxyglucose (FDG) uptake in breast tumors with dedicated detectors typically has been accomplished with two planar detectors in a fixed position with the breast under compression. The potential use of PEM imaging at two detector positions to guide stereotactic breast biopsy has motivated us to use PEM coincidence data acquired at two or more detector positions together in a single image reconstruction. Multiple angle PEM acquisition and iterative image reconstruction were investigated using point source and compressed breast phantom acquisitions with 5, 9, 12 and 15 mm diameter spheres and a simulated tumor:background activity concentration ratio of 6:1. Image reconstruction was performed with an iterative MLEM algorithm that used coincidence events between any two detector pixels on opposed detector heads at each detector position. This present study compared two acquisition protocols: 2 angle acquisition with detector angular positions of -15 and +15 degrees and 11 angle acquisition with detector positions spaced at 3 degree increments over the range -15 to +15 degrees. Three- dimensional image resolution was assessed for the point source acquisitions, and contrast and signal-to-noise metrics were evaluated for the compressed breast phantom with different simulated tumor sizes. Radial and tangential resolutions were similar for the two protocols, while normal resolution was better for the 2 angle acquisition. Analysis is complicated by the asymmetric point spread functions. Signal- to-noise vs. contrast tradeoffs were better for 11 angle acquisition for the smallest visible 9 mm sphere, while tradeoff results were mixed for the larger and more easily visible 12 mm and 15 mm diameter spheres. Additional study is needed to better understand the performance of limited angle tomography for PEM. PEM tomography experiments with complete angular sampling are planned

  6. The Efficacy of Mammography Boot Camp to Improve the Performance of Radiologists

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Eun Hye [Dept. of Radiology, Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon (Korea, Republic of); Jun, Jae Kwan [National Cancer Control Institute, National Cancer Center, Goyang (Korea, Republic of); Jung, Seung Eun [Dept. of Radiology, Seoul St. Mary' s Hospital, College of Medicine, The Catholic University of Korea, Seoul (Korea, Republic of); Kim, You Me [Dept. of Radiology, Dankook University Hospital, Cheonan (Korea, Republic of); Choi, Nami [Dept. of Radiology, Konkuk University Medical Center, Seoul (Korea, Republic of)

    2014-10-15

    To evaluate the efficacy of a mammography boot camp (MBC) to improve radiologists' performance in interpreting mammograms in the National Cancer Screening Program (NCSP) in Korea. Between January and July of 2013, 141 radiologists were invited to a 3-day educational program composed of lectures and group practice readings using 250 digital mammography cases. The radiologists' performance in interpreting mammograms were evaluated using a pre- and post-camp test set of 25 cases validated prior to the camp by experienced breast radiologists. Factors affecting the radiologists' performance, including age, type of attending institution, and type of test set cases, were analyzed. The average scores of the pre- and post-camp tests were 56.0 ± 12.2 and 78.3 ± 9.2, respectively (p < 0.001). The post-camp test scores were higher than the pre-camp test scores for all age groups and all types of attending institutions (p < 0.001). The rate of incorrect answers in the post-camp test decreased compared to the pre-camp test for all suspicious cases, but not for negative cases (p > 0.05). The MBC improves radiologists' performance in interpreting mammograms irrespective of age and type of attending institution. Improved interpretation is observed for suspicious cases, but not for negative cases.

  7. Bavarian mammography recertification program: experiences with a workstation prototype for softcopy reading

    Science.gov (United States)

    Riesmeier, Jorg; Eichelberg, Marco; Kieschke, Joachim; Hellemann, Hans-Peter; Gruschka-Hellemann, Birgit; Sokiranski, Roman; Munte, Axel; Thoben, Wilfried; Jensch, Peter F.

    2003-05-01

    In January 2002, the Bavarian Statutory Health Care Administration ("Kassenarztliche Vereinigung Bayerns", KVB) started a recertification programme for quality assurance and quality improvement in mammography reading. All accredited radiologists and gynaecologists are asked to prove their qualification every 1-2 years. The recertification programme requires the physicians to read 50 cases randomly selected from a larger collection of high-quality test cases. The portion of malignant and benign cases corresponds to the requirements of the German National Association of Statutory Health Insurance Physicians ("Kassenarztliche Bundesvereinigung", KBV). In order to read the mammograms on a softcopy device the images are digitised with a high-quality scanner and converted to DICOM Digital Mammography format. The workstation software has been implemented according to the particular requirements of this programme. To verify the applicability of digitised mammograms for recertification purposes, a comparative study with 32 trained radiologists and gynaecologists has been performed. As a result the study showed that there was no significant difference in the error rate of the reported findings between conventional film and softcopy reading. The first intermediate results of this quality initiative are promising. The introduction of a corresponding federal German recertification programme is intended.

  8. Eight years of quality control in Bulgaria: impact on mammography practice

    International Nuclear Information System (INIS)

    The requirements for quality control (QC) in diagnostic radiology were introduced in Bulgarian legislation in 2005. Hospital medical physicists and several private medical physics groups provide QC services to radiology departments. The aim of this study was to analyse data from QC tests in mammography and to investigate the impact of QC introduction on mammography practice in the country. The study was coordinated by the National Centre of Radiobiology and Radiation Protection. All medical physics services were requested to fill in standardised forms with information about most important parameters routinely measured during QC. All QC service providers responded. Results demonstrated significant improvement of practice since the introduction of QC, with reduction of established deviations from 65 % during the first year to 7 % in the last year. The systems that do not meet the acceptability criteria were suspended from use. Performance of automatic exposure control and digital detectors are not regularly tested because of the absence of requirements in the legislation. The need of updated guidance and training of medical physicists to reflect the change in technology was demonstrated. (authors)

  9. Eight years of quality control in Bulgaria: impact on mammography practice.

    Science.gov (United States)

    Avramova-Cholakova, S; Lilkov, G; Kaneva, M; Terziev, K; Nakov, I; Mutkurov, N; Kovacheva, D; Ivanova, M; Vasilev, D

    2015-07-01

    The requirements for quality control (QC) in diagnostic radiology were introduced in Bulgarian legislation in 2005. Hospital medical physicists and several private medical physics groups provide QC services to radiology departments. The aim of this study was to analyse data from QC tests in mammography and to investigate the impact of QC introduction on mammography practice in the country. The study was coordinated by the National Centre of Radiobiology and Radiation Protection. All medical physics services were requested to fill in standardised forms with information about most important parameters routinely measured during QC. All QC service providers responded. Results demonstrated significant improvement of practice since the introduction of QC, with reduction of established deviations from 65 % during the first year to 7 % in the last year. The systems that do not meet the acceptability criteria were suspended from use. Performance of automatic exposure control and digital detectors are not regularly tested because of the absence of requirements in the legislation. The need of updated guidance and training of medical physicists to reflect the change in technology was demonstrated. PMID:25836697

  10. Comparative study in patients with microcalcifications: full-field digital mammography vs screen-film mammography

    International Nuclear Information System (INIS)

    The goal of this prospective study was to compare a full-field digital mammography system (FFDM) to a conventional screen-film mammography system (SFM) for the detection and characterization of microcalcifications. Fifty-five patients with 57 isolated microcalcification clusters were examined using a FFDM system (Senographe 2000D, GE Medical Systems, Milwaukee, Wis.) and a SFM system (Senographe DMR, GE Medical Systems, Milwaukee, Wis.). A conventional screen-film mammogram and a digital contact mammogram were obtained of each cluster. The image quality and the number of calcification particles were evaluated, and a characterization (BI-RADS 1-5) of microcalcifications was given by four experienced readers. Histopathology revealed 16 benign lesions (sclerosing adenosis, dysplasia, hamartoma, radial scar) in 15 patients and 21 malignant tumors (in situ carcinoma, invasive carcinoma) in 20 patients. Twenty patients had benign changes verified by long-term follow-up. Image quality of FFDM was assessed as superior to SFM in more than 50% of the cases. The FFDM showed more calcifications in 41% of all cases. Sensitivity and specificity for FFDM vs SFM were 95.2 vs 91.9% and 41.4 vs 39.3%, respectively. Moreover, FFDM demonstrated a higher diagnostic accuracy (deviation: 0.86 BI-RADS steps) compared with FSM (deviation 0.93 BI-RADS steps). The FFDM system with a 100-μm pixel size provides better image quality than SFM in patients with mammographic microcalcifications. The FFDM has a higher sensitivity and a higher reliability in characterizing microcalcifications. (orig.)

  11. Full-field digital mammography versus computed radiology mammography: comparison in image quality and radiation dose

    International Nuclear Information System (INIS)

    Objective: To investigate the differences in image quality and radiation dose between full- field digital mammography (FFDM) system and compute radiology mammography (CRM) system. Methods: The ALVIM mammographic phantom was exposed by FFDM system with automatic exposure control (AEC) and then exposed by CRM system with the unique imaging plank on the same condition. The FFDM system applied the same kV value and the different mAs values (14, 16, 18, 22 and 24 mAs), and the emission skin dose (ESD) and the average gland dose (AGD) were recorded for the above-mentioned exposure factors. All images were read by five experienced radiologists under the same condition and judged based on 5-point scales. And then receive operating characteristic (ROC) curve was drawn and the probability (Pdet) values were calculated. The data were statistically processed with ANOVA. Results: The Pdet values of calcifications and lesion lump were higher with FFDM system than with CRM system at the same dose (1.36 mGy). Especially, for microcalcifications and lesion lump, the largest difference of the Pdet value was 0.215, and that of lesion lump was 0.245. In comparison with CRM system, the radiation dose of FFDM system could be reduced at the same Pdet value. The ESD value was reduced by 26%, and the ACD value was reduced by 41%. When the mAs value exceed AEC value, the Pdet value almost had no change, though the radiation dose was increased. Conclusions: The detection rates of microcalcifications and lesion lump with FFDM system are proven to be superior to CRM system at the same dose. The radiation dose of FFDM system was less than CRM system for the same image quality. (authors)

  12. 75 FR 44272 - National Institute of Mental Health; Notice of Closed Meeting

    Science.gov (United States)

    2010-07-28

    ... Mental Health Special Emphasis Panel, CNS HIV Anti-Retroviral Therapy Effects Research Extension (CHARTER... privacy. Name of Committee: National Institute of Mental Health Special Emphasis Panel, CNS HIV Anti-Retroviral Therapy Effects Research as a Resource (CHARTER as a Resource). Date: August 11, 2010. Time:...

  13. The physician charter on medical professionalism from the Chinese perspective: a comparative analysis.

    Science.gov (United States)

    Jin, Pingyue

    2015-07-01

    The charter of medical professionalism in the new millennium (Charter) has been endorsed worldwide, including by the Chinese Medical Doctor Association from 2005. Six years later, the association drafted a Chinese version of medical professionalism based on the Charter, the Chinese Medical Doctor Declaration (Declaration). This Declaration encompasses six tenets, which have large areas of overlap with the Charter. Meanwhile, certain differences also exist between the universal professionalism that the Charter aims to disseminate and the ideal Chinese professionalism that the Declaration endeavours to bolster. In this paper, we explore the unique aspects of the Declaration in contrast with the Charter to gain a deeper understanding of professionalism in the particular context of China. The Declaration may omit some valuable commitments found in the Charter, but it includes longstanding Confucian and cultural traditions of China, as well as consideration of current social circumstances. The Declaration thus re-establishes the ideal of universal professionalism in light of the Chinese context. PMID:25341734

  14. Yet Another Mammography Measure to Evaluate Breast Cancer Risk

    DEFF Research Database (Denmark)

    Karemore, Gopal Raghunath; Brandt, Sami; Nielsen, Mads

    texture can be recognised to distinguish high risk patients and whether the derived information increases the power of categorical and/or planimetric density scoring so as to benchmark our new mammography marker. Material and Methods: Our cross-sectional case-control study (Otten et al, 2005) includes...

  15. Mammography and scintimammography in diagnosis of breast cancer

    International Nuclear Information System (INIS)

    The goal of this study was to assess the value of scintimammography with 99mTc-MIBI, MDP, DMSA(V) and double-phase imaging in detecting breast cancer. Methods: A total of 66 women were evaluated by palpation, mammography, scintimammography. Thirty-two patients were scintimammography with 99mTc-MIBI or MDP. Thirty-four patients were taken double-phase scintimammography with 99mTc-MIBI or 99mTc-DMSA(V). Results: Mammography had an overall sensitivity of 88% and a specificity of 78.95%. Twenty-two patients were considered indeterminate. Scintimammography with 99mTc-MIBI, sensitivity and specificity were 74.29% ?86.96% , respectively . Sensitivity and specificity of 99mTc-MDP were 69.23% and 71.43%, but its imaging background was higher than 99mTc-MIBI. 99mTc-DMSA(V) had low sensitivity and specificity in detecting breast cancer. There is no significant different result between double-phase scintimammography and early phase imaging. Conclusion: 99mTc-MIBI scintimammography is a valuable complementary tool in breast lesions. 99mTc-MIBI is the most suitable to be a tracer among 99mTc-MIBI,MDP and DMSA(V) to a non diagnostic or difficult mammography. Double-phase scintimammography had a limit value in detecting breast cancer compare early phase scintimammography. Scintimammography is more useful to those patients whose mammography are indeterminate

  16. Implications of Overdiagnosis: Impact on Screening Mammography Practices

    Science.gov (United States)

    Morris, Elizabeth; Feig, Stephen A.; Drexler, Madeline

    2015-01-01

    Abstract This review article explores the issue of overdiagnosis in screening mammography. Overdiagnosis is the screen detection of a breast cancer, histologically confirmed, that might not otherwise become clinically apparent during the lifetime of the patient. While screening mammography is an imperfect tool, it remains the best tool we have to diagnose breast cancer early, before a patient is symptomatic and at a time when chances of survival and options for treatment are most favorable. In 2015, an estimated 231,840 new cases of breast cancer (excluding ductal carcinoma in situ) will be diagnosed in the United States, and some 40,290 women will die. Despite these data, screening mammography for women ages 40–69 has contributed to a substantial reduction in breast cancer mortality, and organized screening programs have led to a shift from late-stage diagnosis to early-stage detection. Current estimates of overdiagnosis in screening mammography vary widely, from 0% to upwards of 30% of diagnosed cancers. This range reflects the fact that measuring overdiagnosis is not a straightforward calculation, but usually one based on different sets of assumptions and often biased by methodological flaws. The recent development of tomosynthesis, which creates high-resolution, three-dimensional images, has increased breast cancer detection while reducing false recalls. Because the greatest harm of overdiagnosis is overtreatment, the key goal should not be less diagnosis but better treatment decision tools. (Population Health Management 2015;18:S3–S11) PMID:26414384

  17. Entrance surface dose measurements in mammography using thermoluminescence technique

    Energy Technology Data Exchange (ETDEWEB)

    Rivera, T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada Unidad Legaria del IPM Av. Legaria 694, 11500 Mexico D.F. (Mexico); Vega C, H.R.; Manzanares A, E [Unidad Academica de Estudios Nucleares, Universidad Autonoma de Zacatecas, Apdo. Postal 336, 98000 Zacatecas (Mexico); Azorin, J. [Universidad Autonoma Metropolitana-lztapalapa, Av. San Rafael Atlixco 186, 09340 Mexico D.F. (Mexico); Gonzalez, P.R. [Instituto Nacional de Investigaciones Nucleares, Carretera Mexico Toluca, 52045 Salazar Estado de Mexico (Mexico)

    2007-07-01

    Full text: Of the various techniques that can be used for personnel dosimetry, thermoluminescence dosimetry (TLD) has emerged as a superior technique due to its manifold advantages over other methods of dose estimation. Various phosphors have been therefore investigated regarding their suitability for dosimetry. In this paper, a dosimetry system based on thermally stimulated luminescence (TSL) from zirconium oxide phosphors embedded in polytetrafluorethylene (ZrO{sub 2}+PTFE) was developed for entrance surface doses (ES) measurements in mammography. Small ZrO{sub 2} pellets of 5 mm in diameter and 0.8 mm in thickness were used. The reproducibility of measurements and linearity of ZrO{sub 2} were also studied. The results were compared with those obtained from LiF:Mg,Cu,P usually used for the determination of absorbed dose in mammography. Measurements both per unit air kerma and In vivo were performed using a mammography unit model DMR (General Electric). The results showed that ZrO{sub 2} TLDs can be used for the same X-ray dosimetry applications as LiF:Mg,Cu,P, with each type having the disadvantage of a response dependent on energy, particularly at low energies. These results indicate a considerable potential for use in routine control and In vivo ES measurements in mammography. (Author)

  18. Technical and dosimetric aspects of quality control in mammography

    International Nuclear Information System (INIS)

    Mammography is an effective method for early detection of breast cancer. Before screening programmes using mammography are implemented, a risk (financial cost)/benefit analysis has to be made and a quality-control programme for the technical and dosimetric aspects has to be adopted. This should include daily checks on the film processing and the total mammography procedure. The installation of a mAs meter is essential for daily checks and can be used for determination of the absorbed dose. Accurate determination of the tube voltage is essential with regard to absorbed dose variations. The focal spot size should be measured rather than relying on the value specified by the manufacturer. The determination of the focal charge (mAs) value for actual radiographs of female breasts combined with a measurement of the compressed breast thickness provides information on the absorbed dose values for actual radiographs. An approximately 50 mm thick poly(methyl methacrylate) phantom can be used for determination of absorbed dose in mammography. (author)

  19. Study of signal-to-noise ratio in digital mammography

    Science.gov (United States)

    Kato, Yuri; Fujita, Naotoshi; Kodera, Yoshie

    2009-02-01

    Mammography techniques have recently advanced from those using analog systems (the screen-film system) to those using digital systems; for example, computed radiography (CR) and flat-panel detectors (FPDs) are nowadays used in mammography. Further, phase contrast mammography (PCM)-a digital technique by which images with a magnification of 1.75× can be obtained-is now available in the market. We studied the effect of the air gap in PCM and evaluated the effectiveness of an antiscatter x-ray grid in conventional mammography (CM) by measuring the scatter fraction ratio (SFR) and relative signal-to-noise ratio (rSNR) and comparing them between PCM and the digital CM. The results indicated that the SFRs for the CM images obtained with a grid were the lowest and that these ratios were almost the same as those for the PCM images. In contrast, the rSNRs for the PCM images were the highest, which means that the scattering of x-rays was sufficiently reduced by the air gap without the loss of primary x-rays.

  20. Entrance surface dose measurements in mammography using thermoluminescence technique

    International Nuclear Information System (INIS)

    Full text: Of the various techniques that can be used for personnel dosimetry, thermoluminescence dosimetry (TLD) has emerged as a superior technique due to its manifold advantages over other methods of dose estimation. Various phosphors have been therefore investigated regarding their suitability for dosimetry. In this paper, a dosimetry system based on thermally stimulated luminescence (TSL) from zirconium oxide phosphors embedded in polytetrafluorethylene (ZrO2+PTFE) was developed for entrance surface doses (ES) measurements in mammography. Small ZrO2 pellets of 5 mm in diameter and 0.8 mm in thickness were used. The reproducibility of measurements and linearity of ZrO2 were also studied. The results were compared with those obtained from LiF:Mg,Cu,P usually used for the determination of absorbed dose in mammography. Measurements both per unit air kerma and In vivo were performed using a mammography unit model DMR (General Electric). The results showed that ZrO2 TLDs can be used for the same X-ray dosimetry applications as LiF:Mg,Cu,P, with each type having the disadvantage of a response dependent on energy, particularly at low energies. These results indicate a considerable potential for use in routine control and In vivo ES measurements in mammography. (Author)

  1. Usefulness of mammography of mastectomy site for breast cancer

    Energy Technology Data Exchange (ETDEWEB)

    Son, Eun Ju; Kim, Eun Kyung; Oh, Ki Keun; Huh, Yong Min; Lee, Kyong Sik; Lee, Hye Jin [Yonsei Univ. College of Medicine, Seoul (Korea, Republic of)

    1998-08-01

    To evaluate the usefulness of routine mammography in the detection of local recurrence of breast cancer after mastectomy. Materials and Methods : The clinical and mammographic records of 45 patients who underwent modified mastectomy due to breast cancer were prospectively reviewed. The methods of mastectomy were Auchincloss (n=36), Patey (n=8) and simple resection (n=1). Results : Among the 45 patients, five palpable lesions were detected on physical examination: two of the five were confirmed as tumor recurrence; on mammography, a nodule with microcalcifications and low-density lesion was seen, but the other three were benign. In 40 patients the results of palpation were negative and during follow-up (mean, 10.9 months ) no newly developed lesions were seen. On mammography, ten of 45(22.2%) patients showed abnormalities, namely local skin thickening(n=4,40%),increased density in subcutaneous tissue(n=2,20%), nodules(n=2,20%), benign calcification(n=1,10%) and focal low-density lesion(n=1,10%), but only one case with a nodule was confirmed to be recurrence. Conclusion : Routine mammography of a mastectomy site was not useful for the differentiation of palpable lesions.

  2. Transforming Ottawa Charter health promotion concepts into Swedish public health policy.

    Science.gov (United States)

    Pettersson, Bosse

    2007-01-01

    Swedish public health policy clearly illustrates how the concept of the Ottawa Charter for health promotion can be utilized at a national level. The impact has been more implicit than explicit. Public health has a long history in Sweden and much of the present and future is, and will be, linked to traditional values and structures. International input, however, has been essential to prompt new approaches and change. Health inequalities remain the major shortcoming. The Swedish system offers universal access to healthcare in a decentralized system. Still, primary healthcare, and the health services as a whole have not yet sufficiently embraced the idea of health promotion. Political attention to modern public health at the Prime Minister level was established in late 1980s. Since, continuous initiatives in terms of organization, infrastructure and funding have taken place. With regard to funding, a vast majority of the resources allocated to health promotion will be found outside the health sector. An interesting observation is that the Swedish public health policy with its 11 objective domains remains the same, also after a change of government. Future challenges include maintaining and developing an intersectoral mechanism for implementation, allocating more resources for intervention research to strengthen knowledge-based health promotion, and developing tools for coping better with the challenges of globalisation identified in the Bangkok Charter. PMID:18372877

  3. Understanding Student Discipline Practices in Charter Schools: A Research Agenda

    Science.gov (United States)

    Denice, Patrick; Gross, Betheny; Rausch, Karega

    2015-01-01

    Fair use of exclusionary discipline is a rising concern in public schools. At issue is whether this type of discipline is disproportionately applied to certain groups of students and whether some charter schools use it more frequently. For the first time, data compiled by the Department of Education's Office for Civil Rights capture discipline…

  4. 77 FR 33229 - Sport Fishing and Boating Partnership Council Charter

    Science.gov (United States)

    2012-06-05

    ... Coordination Act (16 U.S.C. 661-667e), and Executive Order 12962 of June 7, 1995-Recreational Fisheries (60 FR 30769, June 7, 1995), as amended by Executive Order 13474 of September 26, 2008 (73 FR 57229, October 1... Office of the Secretary Sport Fishing and Boating Partnership Council Charter AGENCY: Office of...

  5. Charter School Expansion and within District Equity: Confluence or Conflict?

    Science.gov (United States)

    Baker, Bruce D.; Libby, Ken; Wiley, Kathryn

    2015-01-01

    This article explores whether two popular policy initiatives are compatible or conflicting strategies for enhancing educational equality in diverse large urban centers. These two initiatives are (1) charter school expansion and (2) improvement of resource equity across urban public school systems through policies often referred to as weighted…

  6. Charter, Private, and Public Schools Work Together in Boston

    Science.gov (United States)

    Lam, Diana

    2014-01-01

    A public, Catholic, and charter school in Boston all work together to share their strengths and learn from each other in an effort to deliver the best education for all of their students. The arrangement is called the School Performance Partnership, and it is a grantee of the Bill and Melinda Gates Foundation.

  7. A Revenue Planning Tool for Charter School Operators

    Science.gov (United States)

    Keller, Eric; Hayes, Cheryl D.

    2009-01-01

    This revenue planning tool aims to help charter school operators develop a sound revenue base that can meet their school's current and future funding needs. It helps identify and assess potential public (federal, state, and local) and private funding sources. The tool incorporates a four-step revenue planning process which includes: (1)…

  8. School Identity in the Context of Alberta Charter Schools

    Science.gov (United States)

    Thompson, Merlin; Gereluk, Dianne; Kowch, Eugene

    2016-01-01

    The central tenet of this investigation is that educational institutions possess their own school identity. Acknowledging that school identity is influenced by institutional mechanisms and personal dynamics, we examine school identity in the context of 13 Alberta charter schools. Narratives of 73 educational stakeholders across the network of…

  9. Letter: The Athena SWAN Charter and Good Employment Practice

    OpenAIRE

    Julie Ashdown

    2008-01-01

    Both men and women benefit from good employment practice; however, women in particular are adversely affected by bad practice. UCL was one of ten founder members of the Athena SWAN Charter when it was launched in June 2005 to celebrate excellence, and to share good practice in the employment of women in academic science, engineering and technology, especially at senior levels.

  10. The Effects of a Team Charter on Student Team Behaviors

    Science.gov (United States)

    Aaron, Joshua R.; McDowell, William C.; Herdman, Andrew O.

    2014-01-01

    The authors contribute to growing evidence that team charters contribute positively to performance by empirically testing their effects on key team process outcomes. Using a sample of business students in a team-based task requiring significant cooperative and coordinative behavior, the authors compare emergent team norms under a variety of team…

  11. Charter Schools: Lessons in School Reform. Topics in Educational Leadership.

    Science.gov (United States)

    Brouillette, Liane

    This book investigates the strengths and limitations of charter schools as an approach to reform by focusing on the day-to-day reality of students, teachers, administrators, and parents involved. Detailed case studies of seven schools are included. Seymour Sarason's work on the creation of settings provides the lens through which these schools are…

  12. Charter for the Protection of Children and Young People.

    Science.gov (United States)

    Momentum, 2002

    2002-01-01

    Provides the text for United States Conference of Catholic Bishops Charter for the Protection of Children and Young People. This document is part of a special collection of resources in the journal that address sexual abuse and the growing number of both confirmed and alleged cases of pedophilia and sexual abuse within the Catholic Church. (RC)

  13. Catalyst Schools: The Catholic Ethos and Public Charter Schools

    Science.gov (United States)

    Proehl, Rebecca A.; Starnes, Heather; Everett, Shirley

    2015-01-01

    During the past decade, Catholic leaders have been exploring options to revitalize the faltering Catholic school system especially in urban centers. One route being explored by dioceses and religious orders is opening what have been called "religious charter schools." Though not technically religious schools, they integrate many of the…

  14. Texas Roundup: Charter Schooling in the Lone Star State

    Science.gov (United States)

    Smith, Nelson

    2005-01-01

    The Texas example illustrates the challenge faced by today's charter movement: how to meet growing demand while maintaining quality. Its considerable progress is sometimes obscured by headlines about the few schools at the top that generate enormous excitement and world-class achievement and the few at the bottom that use their autonomy for unwise…

  15. Does Dividend Tax Impede Competition for Corporate Charters?

    DEFF Research Database (Denmark)

    Lai, Tat-kei; Ng, Travis

    High dividend income tax in the U.S. can impede state competition in the market for corporate charters. We offer a model to formalize the mechanism through which dividend tax lowers the incentives for a state legislator to refrain from enacting takeover regulations. We test a key driver within th...

  16. The Equity Project Charter School: Impacts on Student Achievement

    OpenAIRE

    Joshua Furgeson; Moira McCullough; Clare Wolfendale; Brian Gill

    2014-01-01

    This report describes The Equity Project (TEP) charter school’s instructional and personnel strategies, examines the characteristics and attrition rates of TEP students, and measures TEP’s impacts on student achievement during the school’s first four years of operation.

  17. What is the point: will screening mammography save my life?

    Directory of Open Access Journals (Sweden)

    Keen James E

    2009-04-01

    Full Text Available Abstract Background We analyzed the claim "mammography saves lives" by calculating the life-saving absolute benefit of screening mammography in reducing breast cancer mortality in women ages 40 to 65. Methods To calculate the absolute benefit, we first estimated the screen-free absolute death risk from breast cancer by adjusting the Surveillance, Epidemiology and End Results Program 15-year cumulative breast cancer mortality to account for the separate effects of screening mammography and improved therapy. We calculated the absolute risk reduction (reduction in absolute death risk, the number needed to screen assuming repeated screening, and the survival percentages without and with screening. We varied the relative risk reduction from 10%–30% based on the randomized trials of screening mammography. We developed additional variations of the absolute risk reduction for a screening intervention, including the average benefit of a single screen, as well as the life-saving proportion among patients with earlier cancer detection. Results Because the screen-free absolute death risk is approximately 1% overall but rises with age, the relative risk reduction from repeated screening mammography is about 100 times the absolute risk reduction between the starting ages of 50 and 60. Assuming a base case 20% relative risk reduction, repeated screening starting at age 50 saves about 1.8 (overall range, 0.9–2.7 lives over 15 years for every 1000 women screened. The number needed to screen repeatedly is 1000/1.8, or 570. The survival percentage is 99.12% without and 99.29% with screening. The average benefit of a single screening mammogram is 0.034%, or 2970 women must be screened once to save one life. Mammography saves 4.3% of screen-detectable cancer patients' lives starting at age 50. This means 23 cancers must be found starting at age 50, or 27 cancers at age 40 and 21 cancers at age 65, to save one life. Conclusion The life-saving absolute benefit of

  18. 76 FR 66845 - United Nations Day, 2011

    Science.gov (United States)

    2011-10-27

    ... October 27, 2011 Part IV The President Proclamation 8740--United Nations Day, 2011 #0; #0; #0... world shaken by war signed the Charter of the United Nations. Determined to move beyond an era of... United Nations provides a forum to seek lasting peace by mediating international disputes,...

  19. Postmortem validation of breast density using dual-energy mammography

    Energy Technology Data Exchange (ETDEWEB)

    Molloi, Sabee, E-mail: symolloi@uci.edu; Ducote, Justin L.; Ding, Huanjun; Feig, Stephen A. [Department of Radiological Sciences, University of California, Irvine, California 92697 (United States)

    2014-08-15

    Purpose: Mammographic density has been shown to be an indicator of breast cancer risk and also reduces the sensitivity of screening mammography. Currently, there is no accepted standard for measuring breast density. Dual energy mammography has been proposed as a technique for accurate measurement of breast density. The purpose of this study is to validate its accuracy in postmortem breasts and compare it with other existing techniques. Methods: Forty postmortem breasts were imaged using a dual energy mammography system. Glandular and adipose equivalent phantoms of uniform thickness were used to calibrate a dual energy basis decomposition algorithm. Dual energy decomposition was applied after scatter correction to calculate breast density. Breast density was also estimated using radiologist reader assessment, standard histogram thresholding and a fuzzy C-mean algorithm. Chemical analysis was used as the reference standard to assess the accuracy of different techniques to measure breast composition. Results: Breast density measurements using radiologist reader assessment, standard histogram thresholding, fuzzy C-mean algorithm, and dual energy were in good agreement with the measured fibroglandular volume fraction using chemical analysis. The standard error estimates using radiologist reader assessment, standard histogram thresholding, fuzzy C-mean, and dual energy were 9.9%, 8.6%, 7.2%, and 4.7%, respectively. Conclusions: The results indicate that dual energy mammography can be used to accurately measure breast density. The variability in breast density estimation using dual energy mammography was lower than reader assessment rankings, standard histogram thresholding, and fuzzy C-mean algorithm. Improved quantification of breast density is expected to further enhance its utility as a risk factor for breast cancer.

  20. Digital Mammography in Young Women: Is a Single View Sufficient?

    Science.gov (United States)

    2016-01-01

    Introduction Single view mammography may be a less time consuming, more comfortable and radiation reduced alternative for young women, but there are no studies examining this approach after the implementation of digital mammography into clinical practice. Materials and Methods Retrospective analysis of all mammographies performed in women younger than 40 years during a 24 month period. The sample consisted of 109 women with 212 examined breasts. All patients initially received standard two- view mammography. In the study setting the MLO- views were read by a single viewer and compared to a composite reference standard. Results In this sample 7 malignant findings were present and the review of the MLO-view detected 6 of them (85%). In patients with dense breasts 4 out of 5 malignant findings were found on the single-view (sensitivity 80%) and all 2 malignant findings were detected in patients with low breast density (sensitivity 100%). There were 7 false positive findings (3.3%). i.e. in total 8 out of 212 examined breasts were therefore misinterpreted (3.8%). Conclusion Single view digital mammography detects the vast majority of malignant findings, especially in low density breast tissue and the rate of false-positive findings is within acceptable limits. Therefore this approach may be used in different scenarios (for example in increasing patient throughput, in resource poor settings, reducing radiation burden in the young or in combination with ultrasound to use the strengths of both methods). More research on this topic is needed to establish its potential role in breast imaging. PMID:27134963

  1. Postmortem validation of breast density using dual-energy mammography

    International Nuclear Information System (INIS)

    Purpose: Mammographic density has been shown to be an indicator of breast cancer risk and also reduces the sensitivity of screening mammography. Currently, there is no accepted standard for measuring breast density. Dual energy mammography has been proposed as a technique for accurate measurement of breast density. The purpose of this study is to validate its accuracy in postmortem breasts and compare it with other existing techniques. Methods: Forty postmortem breasts were imaged using a dual energy mammography system. Glandular and adipose equivalent phantoms of uniform thickness were used to calibrate a dual energy basis decomposition algorithm. Dual energy decomposition was applied after scatter correction to calculate breast density. Breast density was also estimated using radiologist reader assessment, standard histogram thresholding and a fuzzy C-mean algorithm. Chemical analysis was used as the reference standard to assess the accuracy of different techniques to measure breast composition. Results: Breast density measurements using radiologist reader assessment, standard histogram thresholding, fuzzy C-mean algorithm, and dual energy were in good agreement with the measured fibroglandular volume fraction using chemical analysis. The standard error estimates using radiologist reader assessment, standard histogram thresholding, fuzzy C-mean, and dual energy were 9.9%, 8.6%, 7.2%, and 4.7%, respectively. Conclusions: The results indicate that dual energy mammography can be used to accurately measure breast density. The variability in breast density estimation using dual energy mammography was lower than reader assessment rankings, standard histogram thresholding, and fuzzy C-mean algorithm. Improved quantification of breast density is expected to further enhance its utility as a risk factor for breast cancer

  2. Is Administration Leaner in Charter Schools? Resource Allocation in Charter and Traditional Public Schools. Working Paper #24

    Science.gov (United States)

    Arsen, David; Ni, Yongmei

    2012-01-01

    There is widespread concern that administration consumes too much of the educational dollar in traditional public schools, diverting needed resources from classroom instruction and hampering efforts to improve student outcomes. By contrast, charter schools are predicted to have leaner administration and allocate resources more intensively to…

  3. A survey on performance status of mammography machines: Image quality and dosimetry studies using a standard mammography imaging phantom

    International Nuclear Information System (INIS)

    It is essential to perform quality control (QC) tests on mammography equipment in order to produce an appropriate image quality at a lower radiation dose to patients. Imaging and dosimetric measurements on 15 mammography machines located at the busiest radiology centres of Mumbai (India)) were carried out using a standard CIRS breast imaging phantom in order to see the level of image quality and breast doses. The QC tests include evaluations of image quality and the mean glandular doses (MGD), which is derived from the breast entrance exposure, half-value layer (HVL), compressed breast thickness (CBT) and breast tissue compositions. At the majority of the centres, film-processing and darkroom conditions were not found to be maintained, which is required to meet the technical development specifications for the mammography film in use as recommended by the American College of Radiology (ACR). In most of the surveyed centres, the view-box luminance and room illuminance conditions were not found to be in line with the mammography requirements recommended by the ACR. The measured HVL values of the machines were in the range of 0.27-0.39 mm aluminium (Al) with a mean value of 0.33±0.04 mm Al at 28 kV. p following the recommendation provided by ACR. The measured MGDs were in the range of 0.14-3.80 mGy with a mean value of 1.34 mGy. The measured MGDs vary between centre to centre by a factor of 27.14. Referring to patient doses and image quality, it was observed that only one mammography centre has exceeded the recommended MGD, i.e. 3.0 mGy per view with the value of 3.80 mGy and at eight mammography centres the measured central background density (CBD) values for mammography phantom image are found to be less than the recommended CBD limit value of 1.2-2.0 optical density. (authors)

  4. Comparison of digital screening mammography and screen-film mammography in the early detection of clinically relevant cancers: a multicenter study

    NARCIS (Netherlands)

    Bluekens, A.M.; Holland, R.; Karssemeijer, N.; Broeders, M.J.M.; Heeten, G.J. den

    2012-01-01

    Purpose: To compare screen-film mammography with digital mammography in a breast cancer screening program, with a focus on the clinical relevance of detected cancers. Materials and Methods: The study was approved by the regional medical ethics review board. Informed consent was not required. Before

  5. A Comparison of the Perceptions of School Work Culture by Administrators and Faculty in the Public Charter and Non-Charter Elementary Schools of a Central Florida County

    Science.gov (United States)

    Quin, Wayne Anthony

    2012-01-01

    This study investigated perceptions of school work culture of instructional staff members (administrators and faculty) in public charter and public non-charter elementary schools in a large urban metropolitan county of Central Florida by assessing differences in perceptions of administrators and faculty related to school work culture, perceptions…

  6. The Mayors' Charter Schools

    Science.gov (United States)

    Magee, Michael

    2014-01-01

    In 2007, the case could be made that Rhode Island had, dollar for dollar, the worst-performing public education system in the United States. Despite per-pupil expenditures ranking in the top 10 nationally, the state's 8th graders fared no better than 40th in reading and 33rd in math on the National Assessment of Educational Progress (NAEP).…

  7. Handbook of glandular tissue doses in mammography. Final report March 1985

    International Nuclear Information System (INIS)

    This Handbook contains data from which absorbed dose to glandular tissue in the breast (glandular tissue dose) can be estimated for mammographic procedures. The breast (excluding the skin) is a composite of adipose (i.e., fatty) and glandular (i.e., other soft) tissues. The glandular tissue is the tissue considered at risk for breast cancer. The intent of the Handbook is to permit the user to compute glandular tissue dose for various techniques in mammography as a function of breast compression, breast size, breast composition, and the quality of the x-ray beam. The method used to compute most of the basic data was a radiation transport calculation using a specialized version of a computer code developed at the Oak Ridge National Laboratory (Warner, 1973). The results of the calculations were then converted into the Handbook entries, using the specific characteristics of current mammographic techniques. Additional data are reproduced from previous work of others

  8. A model of the influence of false-positive mammography screening results on subsequent screening

    OpenAIRE

    DeFrank, Jessica T.; Brewer, Noel

    2010-01-01

    Decades of empirical research have demonstrated psychological and behavioural consequences of false-positive medical tests. To organise this literature and offer novel predictions, we propose a model of how false-positive mammography results affect return for subsequent mammography screening. We propose that false-positive mammography results alter how women think about themselves (e.g., increasing their perceived likelihood of getting breast cancer) and the screening test (e.g., believing ma...

  9. At what age should screening mammography be recommended for Asian women?

    OpenAIRE

    Tsuchida, Junko; Nagahashi, Masayuki; Rashid, Omar M.; Takabe, Kazuaki; Wakai, Toshifumi

    2015-01-01

    Although regular screening mammography has been suggested to be associated with improvements in the relative survival of breast cancer in recent years, the appropriate age to start screening mammography remains controversial. In November 2009, the United States Preventive Service Task Force published updated guidelines for breast cancer, which no longer support routine screening mammography for women aged 40–49 years, but instead, defer the choice of screening in that age group to the patient...

  10. Quality control: comparison of images quality with screen film system and digital mammography CR

    International Nuclear Information System (INIS)

    The mammography screen film system should be used as part of processing chemicals, revelation process, equipment and this system has have a progressive replacing by the digital technology Full Field Digital Mammography FFDM, Computed Radiography (CR) Mammography and hardcopy. This new acquisition process of medical images has improved radiology section; however it is necessary efficient means for evaluating of the quality parameters. It should be considered taking into account the adaptation of the existent equipment and that procedures adopted for the exam, as well the adaptation of the new mammography films, the radiologist view box constitutes a part of the quality control program. This program aims at obtaining radiography with good quality that allows obtaining more information for the diagnosis and decreases the patient dose. For evaluation the quality image, this article is focused on presenting the differences regarding the acquired images through simulator mammography radiographic PMMA (Poly methyl methacrylate) in CR Mammography system and screen film system. The tests were accomplished at the same equipment of Mammography with the Automatic Exposure Control using a tension of 28 kV for both systems. The quality tests evaluated the spatial resolution, the own structures of the phantom, artifacts, optical density and contrast with conventional and laser films by mammography system. The installation for the accomplishment of the test has a quality control program. The evaluation was based on the pattern developed by the competent organ of the State of Minas Gerais. In this study, it was verified that the suitable Phantom Mama used by the Brazilian School of Radiology for conventional mammography did not obtain satisfactory result for Spatial Resolution in the digital mammography system CR. The final aim of this work is to obtain parameters to characterize the reference phantom quality image in an objective way. These parameters will be used to compare

  11. Review and analysis of mammographies of Servicio de Radiologia Hospital San Juan de Dios

    International Nuclear Information System (INIS)

    The concept of mammography is defined. The mammography has been estimated as the best tool currently available for the detection of breast cancer in its early stages, in addition, have been detected clinically occult lesions. Mammographies of the Servicio de Radiologia Hospital San Juan de Dios were analyzed for a total of 1250. The findings were related as static between BIRADS categorization and inherited-family factors, geographical and personal pathological of patients treated in the period September 2012 to January 2013

  12. A technique optimization protocol and the potential for dose reduction in digital mammography

    OpenAIRE

    Ranger, Nicole T.; Lo, Joseph Y.; Samei, Ehsan

    2010-01-01

    Digital mammography requires revisiting techniques that have been optimized for prior screen∕film mammography systems. The objective of the study was to determine optimized radiographic technique for a digital mammography system and demonstrate the potential for dose reduction in comparison to the clinically established techniques based on screen- film. An objective figure of merit (FOM) was employed to evaluate a direct-conversion amorphous selenium (a-Se) FFDM system (Siemens Mammomat Novat...

  13. Reducing disparities in mammography-use in a multicultural population in Israel

    OpenAIRE

    Friedman Nurit; Baron-Epel Orna; Lernau Omri

    2009-01-01

    Abstract Background In the past mammography-use has been reported to be low in Israel compared to other western countries. The objectives of this study were (1) to assess the increase in mammography-use during the years 2002 to 2007 in four population groups in Maccabi Healthcare Services (MHS), Israel: non-immigrant non-ultraorthodox, ultraorthodox, and immigrant Jewish women and Arab women; (2) to assess ethnic and socioeconomic disparities in mammography-use. Methods A random telephone sur...

  14. Screening for breast cancer with mammography

    DEFF Research Database (Denmark)

    Gøtzsche, Peter C; Jørgensen, Karsten Juhl

    2013-01-01

    A variety of estimates of the benefits and harms of mammographic screening for breast cancer have been published and national policies vary.......A variety of estimates of the benefits and harms of mammographic screening for breast cancer have been published and national policies vary....

  15. Mammographic density is the main correlate of tumors detected on ultrasound but not on mammography.

    Science.gov (United States)

    Häberle, Lothar; Fasching, Peter A; Brehm, Barbara; Heusinger, Katharina; Jud, Sebastian M; Loehberg, Christian R; Hack, Carolin C; Preuss, Caroline; Lux, Michael P; Hartmann, Arndt; Vachon, Celine M; Meier-Meitinger, Martina; Uder, Michael; Beckmann, Matthias W; Schulz-Wendtland, Rüdiger

    2016-11-01

    Although mammography screening programs do not include ultrasound examinations, some diagnostic units do provide women with both mammography and ultrasonography. This article is concerned with estimating the risk of a breast cancer patient diagnosed in a hospital-based mammography unit having a tumor that is visible on ultrasound but not on mammography. A total of 1,399 women with invasive breast cancer from a hospital-based diagnostic mammography unit were included in this retrospective study. For inclusion, mammograms from the time of the primary diagnosis had to be available for computer-assisted assessment of percentage mammographic density (PMD), as well as Breast Imaging Reporting and Data System (BIRADS) assessment of mammography. In addition, ultrasound findings were available for the complete cohort as part of routine diagnostic procedures, regardless of any patient or imaging characteristics. Logistic regression analyses were conducted to identify predictors of mammography failure, defined as BIRADS assessment 1 or 2. The probability that the visibility of a tumor might be masked at diagnosis was estimated using a regression model with the identified predictors. Tumors were only visible on ultrasound in 107 cases (7.6%). PMD was the strongest predictor for mammography failure, but age, body mass index and previous breast surgery also influenced the risk, independently of the PMD. Risk probabilities ranged from 1% for a defined low-risk group up to 40% for a high-risk group. These findings might help identify women who should be offered ultrasound examinations in addition to mammography. PMID:27389655

  16. The evaluation of radiation dose by exposure method in digital magnification mammography

    International Nuclear Information System (INIS)

    In digital mammography, Exposure factor were automatically chosen using by measurement breast thickness and the density of mammary gland. It may cause a increase glandular dose. The purpose of this study was to investigate optimal image quality in digital magnification mammography to decrease radiation exposure of patient dose. Auto mode gives the best image quality however, AGD showed better image quality. Image quality of manual mode passed phantom test and SNR at 55% mAs of auto mode commonly used in the digital magnification mammography. Also it could reduce AGD. According to result, manual mode may reduce the unnecessary radiation exposure in digital magnification mammography

  17. Ultrasound as an Adjunct to Mammography for Breast Cancer Screening: A Health Technology Assessment

    Science.gov (United States)

    2016-01-01

    Background Screening with mammography can detect breast cancer early, before clinical symptoms appear. Some cancers, however, are not captured with mammography screening alone. Ultrasound has been suggested as a safe adjunct screening tool that can detect breast cancers missed on mammography. We investigated the benefits, harms, cost-effectiveness, and cost burden of ultrasound as an adjunct to mammography compared with mammography alone for screening women at average risk and at high risk for breast cancer. Methods We searched Ovid MEDLINE, Ovid Embase, EBM Reviews, and the NHS Economic Evaluation Database, from January 1998 to June 2015, for evidence of effectiveness, harms, diagnostic accuracy, and cost-effectiveness. Only studies evaluating the use of ultrasound as an adjunct to mammography in the specified populations were included. We also conducted a cost analysis to estimate the costs in Ontario over the next 5 years to fund ultrasound as an adjunct to mammography in breast cancer screening for high-risk women who are contraindicated for MRI, the current standard of care to supplement mammography. Results No studies in average-risk women met the inclusion criteria of the clinical review. We included 5 prospective, paired cohort studies in high-risk women, 4 of which were relevant to the Ontario context. Adjunct ultrasound identified between 2.3 and 5.9 additional breast cancers per 1,000 screens. The average pooled sensitivity of mammography and ultrasound was 53%, a statistically significant increase relative to mammography alone (absolute increase 13%; P mammography screening alone. The GRADE for this body of evidence was low. Additional annual costs of using breast ultrasound as an adjunct to mammography for high-risk women in Ontario contraindicated for MRI would range from $15,500 to $30,250 in the next 5 years. Conclusions We found no evidence that evaluated the comparative effectiveness or diagnostic accuracy of screening breast ultrasound as an

  18. Mammography in breast screening and in the evaluation and management of breast cancer

    International Nuclear Information System (INIS)

    This paper aims to discuss the importance of breast screening most especially amongst women above the age of 40 years.the limitation of the screening procedure is due to lack of special machines and power awareness campaigns. the application of Mammography and ultrasound in the examination of the breast and other breast imaging techniques will be considered in this paper. The paper will look at the indications for mammography, indications for breast ultrasound, signs of breast carcinoma on mammography, breast enlargement and also the need for breast ultrasound in cases of discrete Mammography

  19. Measurement of half-value layer in mammography

    CERN Document Server

    Yagi, H; Saruwatari, R; Doi, N; Yamane, E

    2003-01-01

    The half-value layer (HVL) of an X-ray beam for film-screen mammography is considered an important parameter for image quality and patient dose. Thus, HVL must be measured in accordance with The Manual of Accuracy for Mammography printed by the Japanese Society of Radiological Technology. The manual prescribes exactly the geometry of measurement, chamber position of measurement in the field, selection of chamber, and so on. However, the measurement of HVL is difficult in the actual clinical setting. This study examined the results of failure to perform the measurement of HVL in accordance with the manual for measuring HVL in the clinical setting. The investigation indicated that serious problems do not arise when measuring HVL for routine quality control even if the chamber in the field is not always set according to the manual and if a chamber for radiotherapy or diagnosis is used that is not recommended for soft X-ray by the manual. (author)

  20. Recall Rate in Screening Mammography, What is Optimal?

    Directory of Open Access Journals (Sweden)

    Maryam Moradi

    2010-05-01

    Full Text Available Recall rate is defined as the percentage of screening mammography for which further work up is recommended. As the recall rate increases, sensivity is increased but specificity and positive predictive value are decreased. It is a trade off between sensivity and specificity."nIndeed in all the women recalled, a very few cancer patients were diagnosed at the expence of an increased number of procedures for a large population of the non-cancerous group and the associated cost, time and anxiety."nThe purpose of this presentation is to review the main criteria for measured performance of screening mammography, the role of recall rate as a surrogate measure and discussing the target or optimal recall rate.

  1. Screening mammography in women 65 years old and older

    International Nuclear Information System (INIS)

    This paper compares the results of mammographic screening in women aged 65 years and older to those of women aged 50--64 years, to define risk factors and prior use of mammography in these women, and to determine whether mammographic abnormalities are managed differently in the two age groups. Historical data, mammographic findings, and biopsy results were analyzed for all women over 50 years of age screened during 1988 (2,862 patients) at a university hospital-based outpatient center and mobile van, excluding those referred by oncologists. The following factors were determined for patients screened at the outpatient center and the mobile van, with both groups divided according to patient age (50--64 vs ≥ 65 years): presence of risk factors, previous biopsy, exogenous hormones, percentage of black patients, previous mammography, biopsy rate, cancer detection rate, positive nodes, and presence of tumors smaller than 1 cm or ductal carcinoma in-situ

  2. Motion artifacts in dual-energy contrast-enhanced mammography

    Science.gov (United States)

    Allec, Nicholas; Abbaszadeh, Shiva; Lewin, John M.; Karim, Karim S.

    2012-03-01

    Several strategies have been investigated to acquire both low- and high-energy images simultaneously for contrastenhanced mammography (CEM). However, for the dual-energy technique where the existing conventional mammography infrastructure can be leveraged, low- and high-energy images are acquired using two separate exposures and the finite time between image acquisition leads to motion artifacts in the combined image. Motion artifacts lead to greater noise in the combined image and affect image quality, however the relationship between them is not clear. In this study we examine motion artifacts in dual-energy CEM and their impact on anatomical noise in the combined image and tumor detectability. To study the impact of motion artifacts, a cascaded systems model is extended to include such motion artifacts. An ideal observer model is used to quantify the performance and CEM images from a previous clinical study are used for comparison of the extended model.

  3. The performance of commercial photodiodes for dosimetry in mammography

    International Nuclear Information System (INIS)

    This paper reports the results of an investigation carried out to determine the suitability of using a commercially available photodiode for dosimetry in mammography thereby providing a low cost dosemeter with a direct reading of the radiation dose. A mammographic X-ray generator (Siemens Mammomat 1000) with tube potential in the 23-30 kV range and a constant potential X-ray generator (Pantak) with a W/Mo anode/filter combination were used in this study. The results showed that the photodiode response is highly linear within mammographic dose ranges and that the energy dependence was <3% at tube potentials of 25-30 kV. Good agreement was observed between the incident air kerma measured with both the photodiode and the ionization chamber. These results show the viability of using the photodiode as a dosemeter system in mammography. (authors)

  4. An SVM Based Approach for the Analysis Of Mammography Images

    International Nuclear Information System (INIS)

    Mammography is among the most popular imaging techniques used in the diagnosis of breast cancer. Nevertheless distinguishing between healthy and ill images is hard even for an experienced radiologist, because a single image usually includes several regions of interest (ROIs). The hardness of this classification problem along with the substantial amount of data, gathered from patients' medical history, motivates the use of a machine learning approach as part of a CAD (Computer Aided Detection) tool, aiming to assist radiologists in the characterization of mammography images. Specifically, our approach involves: i) the ROI extraction, ii) the Feature Vector extraction, iii) the Support Vector Machine (SVM) classification of ROIs and iv) the characterization of the whole image. We evaluate the performance of our approach in terms of the SVM's training and testing error and in terms of ROI specificity - sensitivity. The results show a relation between the number of features used and the SVM's performance

  5. Image processing techniques to evaluate mammography screening quality

    International Nuclear Information System (INIS)

    Mammography imaging has proved to be the best noninvasive method for breast cancer diagnosis, but it requires that irradiation parameters are set within Protocols recommendations (minimal dose delivering). This work presents an investigation on mammography image formation by means of validated Monte Carlo simulations along with further image analysis and mathematical processing. Several image processing methods have been suitably introduced and investigated according to their capability for micro-calcification detection and quality evaluation. The obtained results suggest the feasibility of all the proposed methods. Furthermore, it was possible to characterize the reliability of each and to infer the corresponding advantages or disadvantages, obtaining an image quality evaluation as a function of several parameters configurations. (author)

  6. Diagnostic reference levels in digital mammography: a systematic review

    International Nuclear Information System (INIS)

    This study aims to review the literature on existing diagnostic reference levels (DRLs) in digital mammography and methodologies for establishing them. To this end, a systematic search through Medline, Cinahl, Web of Science, Scopus and Google scholar was conducted using search terms extracted from three terms: DRLs, digital mammography and breast screen. The search resulted in 1539 articles of which 22 were included after a screening process. Relevant data from the included studies were summarised and analysed. Differences were found in the methods utilised to establish DRLs including test subjects types, protocols followed, conversion factors employed, breast compressed thicknesses and percentile values adopted. These differences complicate comparison of DRLs among countries; hence, an internationally accepted protocol would be valuable so that international comparisons can be made. (authors)

  7. Pathological examination for cases showing mammography findings above category 3

    International Nuclear Information System (INIS)

    We describe the present state of pathological examination since we introduced Mammotome in November 2003 to clarify the accuracy of mammography findings. We performed mammography in 1,259 cases between November 2003 and March 2005 in our hospital. There were 207 patients showing classified finding as category 3 or above. Pathological examination was performed in 52 cases. Patients diagnosed as having breast cancer comprised 3/16 (19%) in category 3, 10/20 (50%) in category 4 and 14/16 (88%) in category 5. The first choice for pathological examination was fine needle aspiration (FNA). When FNA was unable to diagnose the lesion, core needle biopsy, surgical biopsy or Mammotome was performed. In 10 cases, Stereotactic Mammotome was used. Of these cases, 50% demonstrated breast cancer. (author)

  8. Do charter schools crowd out private school enrollment? Evidence from Michigan

    OpenAIRE

    Chakrabarti, Rajashri; Roy, Joydeep

    2010-01-01

    Charter schools have been one of the most important dimensions of recent school reform measures in the United States. Currently, there are more than 4,500 charter schools spread across forty U.S. states and the District of Columbia. Though there have been numerous studies on the effects of charter schools, these have mostly been confined to analyzing the effects on student achievement, student demographic composition, parental satisfaction, and the competitive effects on regular public school...

  9. What Do Parents Want? Factors Affecting Parental Decisions in Charter School Enrollment

    OpenAIRE

    Delaney, Patrick Prescott

    2008-01-01

    As an avenue of educational reform and organizational restructuring within public education, school choice has gained in popularity over the last twenty years. The charter school movement, in particular, has enjoyed a high growth rate since its introduction in 1992. Advocates of charter schools claim the schoolsâ regulatory freedom and unique structure foster improved academic performance and educational success. However, the literature shows charter school studentsâ performance is typ...

  10. Case Studies ofEmerging Ethnocentric Charter Schools in Hawai'i

    OpenAIRE

    Nina K. Buchanan; Fox, Robert A.

    2003-01-01

    The fast growing charter school movement may be impeded if charter schools are perceived as a vehicle for stratifying, segregating, and balkanizing an already ethnically, socio-economically divided population. This article defines ethnocentric schools and describes three Native Hawai'ian charter schools. While they are very different in curricula and in emphasis on the Hawai'ian language and other features, they all have strong community support and a high degree of parental involvement and h...

  11. Chartered teachers matter: envisioning their future as leaders of learning

    OpenAIRE

    Hudson, Brian

    2012-01-01

    This report traces the development of the Chartered Teacher Scheme (CTS) using an approach based on documentary analysis of reports published during the last 10 years. It places this significant and far-sighted policy initiative, which was an important pillar in A Teaching Profession for the 21st Century (2001), within a wider international context in which the “Scottish approach” has been recognised as being at the forefront of quality improvement in schools. Central to this h...

  12. Standard Chartered Bank: Women on Corporate Boards in India 2010

    OpenAIRE

    Banerji, A.; Mahtani, S.; Sealy, Ruth; Vinnicombe, Susan

    2010-01-01

    This first Standard Chartered Bank: Women on Corporate Boards in India 2010 report looks at the representation of women on the boards of India's leading companies on the Bombay Stock Exchange (BSE-100) . It ranks the companies in terms of the gender diversity of their boards, with those with the highest percentage of women on their boards appearing at the top. The report also examines the general topic of gender diversity on the boards of the BSE-100 by presenting the findin...

  13. Organizational Culture : a case study of standard chartered (Vietnam) Ltd

    OpenAIRE

    Nguyen, Kien Doan

    2014-01-01

    The aim of this thesis is to understand the definition of organizational culture and examine organizational culture of Standard Chartered Bank (Vietnam) Ltd (SCB). Organizational culture has become a interesting topic. The company now are aware of its important role as a competitive advantage. The thesis will go though definitions of various researcher to find out the common understanding. A few methods of approaching organizational culture are considered to find a prooer framework for ca...

  14. A welfare analysis of Canadian chartered bank mergers

    OpenAIRE

    James McIntosh

    2002-01-01

    An econometric model of Canada's five largest banks is estimated using time series data from 1976 to 1996. The principal findings are that chartered bank technology is characterized by increasing returns to scale. Scale efficiency is sufficiently large to offset the consequences of reduced competition that might have arisen from a merger between Bank of Montreal and Royal Bank of Canada, Canadian Imperial Bank of Commerce and Toronto Dominion Bank, or both. The estimated model predicts that a...

  15. Classification of breast density in X-ray mammography

    Czech Academy of Sciences Publication Activity Database

    Remeš, Václav; Haindl, Michal

    New York, NY,: IEEE, 2015, s. 1-5. ISBN 978-1-4673-8457-5. [2015 International Workshop on Computational Intelligence for Multimedia Understanding (IWCIM). Praha (CZ), 29.10.2015-30.10.2015] R&D Projects: GA ČR(CZ) GA14-10911S Institutional support: RVO:67985556 Keywords : Breast cancer * breast density * Mammography * MRF * ACR * BI-RADS Subject RIV: BD - Theory of Information http://library.utia.cas.cz/separaty/2016/RO/haindl-0454449.pdf

  16. Digital whole-field mammography: Basic physical and clinical aspects

    International Nuclear Information System (INIS)

    As digital radiography offers clear diagnostic advantages linked to techniques such as diagnostic image reprocessing, data transmission and archivation, technical enhancements developed during the last few years also encompass improvements for whole-field mammography, i.e experimental and, to some part, clinical testing of new image storing media. One crucial aspect in this context was the achievable positional resolving power. (orig./MG)

  17. Evaluation of glandular dose in conventional and digital mammography systems

    International Nuclear Information System (INIS)

    A survey was conducted to estimate the average glandular dose (Dg) for patients undergoing mammography and to report the distribution of incident air kerma (Ki), patient age, compressed breast thickness and glandular tissue content. From 1183 cranio caudal mammograms clinical data were collected and doses were measured. The survey data included mammograms from six mammography equipment: two screen/film units (SFM), two computed radiography units (CR) and two full-field digital (DR). Mean value for patient age and compressed breast thickness were 57 +-12 y and 5.4 +-1.4 cm, respectively. To investigate the importance of technical characteristics of three different mammography systems and breast glandularity, Ki and Dg were measured for individual breast of 392 patients from the original sample with compressed breast thickness in the range of 5.5 cm to 6.5 cm using tissue-equivalent phantoms of different glandularities manufactured in this study to mimic both the attenuation and the density of breast tissues. Mean Ki value was 10.0 +-3.6 mGy for SFM systems, 12.0 +-3.6 mGy for CR systems and 4.9 +-1.3 mGy for DR systems. Mean Dg value was 1.4 +-0.5 mGy for S/F systems, 1.7 +-0.5 mGy for CR systems and 0.9 +-0.2 mGy for D R systems. Statistical analysis for differences in mean values of Ki and Dg between mammography systems showed significant effect of their technical characteristics (p i and Dg, it was observed statistically significant differences between the group of patients with 0 to 50% glandularity and the group of patients with 50 to 100% glandularity. (author)

  18. Patient Care, Communication, and Safety in the Mammography Suite.

    Science.gov (United States)

    Arnold, Leisa

    2016-09-01

    Producing high-quality mammograms requires excellent technical skills along with exemplary communication. Mammographers must be able to address differences in patients' mental states, body habitus, and physical ability to obtain an optimal examination. In addition, every mammographer must practice consistently with patient safety, care, and satisfaction in mind. This article discusses verbal and nonverbal communication strategies, barriers to communication, and the care and safety of patients in the mammography suite who present special challenges. PMID:27601710

  19. Contrast detail analysis in mammography utilizing Monte Carlo methods

    OpenAIRE

    Μεταξάς, Βασίλειος

    2010-01-01

    Mammography, either for screening or for the examination of a woman who displays symptoms of breast cancer, must be capable of revealing subtle differences in density and composition of breast parenchymal tissue, as well as the presence of any abnormalities. This is a challenging imaging task since connective tissue, glandular tissue, skin and fat must be simultaneously visualized and differentiated, while having very similar attenuation coefficients and thus low subject contrast. The detecti...

  20. Four Principles to Consider Before Advising Women on Screening Mammography

    OpenAIRE

    Keen, John D; Jørgensen, Karsten J

    2015-01-01

    Abstract This article reviews four important screening principles applicable to screening mammography in order to facilitate informed choice. The first principle is that screening may help, hurt, or have no effect. In order to reduce mortality and mastectomy rates, screening must reduce the rate of advanced disease, which likely has not happened. Through overdiagnosis, screening produces substantial harm by increasing both lumpectomy and mastectomy rates, which offsets the often-promised bene...