نتایج جستجو برای: filter mammograms

تعداد نتایج: 125500  

2008
Predrag R. Bakic Despina Kontos Andrea B. Troxel Andrew D. A. Maidment

We analyzed breast percent density (PD) estimated from 35 women with existing or recently detected abnormalities. Analyzed were digital mammograms (DM) and the central digital breast tomosynthesis (DBT) reconstructed slices. PD was estimated from the breast contralateral to cancer. We have examined the effect of modifying the DBT reconstruction filter on the accuracy of dense tissue segmentatio...

علی اصغر مولوی, ,

Background: Accurate computation of the radiation dose to the breast is essential to mammography. Various the thicknesses of breast, the composition of the breast tissue and other variables affect the optimal breast dose. Furthermore, the glandular fraction, which refers to the composition of the breasts, as partitioned between radiation-sensitive glandular tissue and the adipose tissue, also h...

Journal: :Journal of the National Cancer Institute 2004
Daniel B Kopans

BACKGROUND Few studies have evaluated interventions to decrease a woman's anxiety after she receives an abnormal mammogram (i.e., one with a recommendation for follow-up). We performed a controlled trial to compare the effects of both an immediate reading of mammograms (i.e., a radiology intervention) and of an educational intervention that taught skills to cope with anxiety on the psychologica...

2014
Sahar Mansour Lamia Adel Omina Mokhtar Omar Sherif Omar

Subjects and methods The study included 166 mammograms with indeterminate findings selected from 1600 mammograms. They were classified into two groups: group 1 ‘Diagnostic mammograms’ of symptomatic women and group 2 ‘Screening mammograms’. Dense breasts assigned as ACR3 and ACR4 presented 69% (n = 114/166) of the studied cases. FFDM and 3D tomosynthesis examination was done and imaging finding...

2010
Zhiyong Zhang Joan Lu Jim Yip

This research investigated the state of art of computer aided detection systems for digital mammograms, and evaluated the related techniques in image pre-processing, feature extraction and classification of digital mammograms. Furthermore, this paper explored the further research directions for next generation CAD for mammograms. It was identified that computer-aided detection techniques for ma...

Journal: :BMC Health Services Research 2008
Eduard Molins Francesc Macià Francesc Ferrer Maria-Teresa Maristany Xavier Castells

BACKGROUND Radiologists have been observed to differ, sometimes substantially, both in their interpretations of mammograms and in their recommendations for follow-up. The aim of this study was to determine how factors related to radiologists' experience affect the accuracy of mammogram readings. METHODS We selected a random sample of screening mammograms from a population-based breast cancer ...

Journal: :IJDCF 2009
Chang-Tsun Li Yue Li Chia-Hung Wei

Picture archiving and communication systems (PACS) are typical information systems, which may be undermined by unauthorized users who have illegal access to the systems. This paper proposes a role-based access control framework comprising two main components – a content-based steganographic module and a reversible watermarking module, to protect mammograms on PACSs. Within this framework, the c...

Journal: :Breast care 2013
Christoph Uleer Joachim Wagner Christina Moisidis-Tesch

The introduction of the Mammography Screening Program (MSP) in 2005 has changed the early detection of breast cancer in Germany significantly. We analyzed the frequency and ensuing health care costs of mammograms performed for the early detection of breast cancer before and after the introduction of the MSP. Furthermore, we analyzed the influence of the MSP on the demographics of physicians (gy...

Journal: :Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology 2012
Joshua J Fenton Weiwei Zhu Steven Balch Rebecca Smith-Bindman Karen K Lindfors Rebecca A Hubbard

BACKGROUND While Medicare claims are a potential resource for clinical mammography research or quality monitoring, the validity of key data elements remains uncertain. Claims codes for digital mammography and computer-aided detection (CAD), for example, have not been validated against a credible external reference standard. METHODS We matched Medicare mammography claims for women who received...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده برق و کامپیوتر 1392

آلتراسوند یکی از روش های تصویربرداری است که هیج ضرری برای بدن ندارد، بنابرین نسبت به سایر دستگاه های پزشکی از محبوبیت و کاربرد بیشتری برخوردار است. طراحی بورد front-end یکی از چالشهای بزرگ در طراحی دستگاه سونوگرافی است که در آن سیگنالهای مدوله شده از بدن با دامنه بسیار کم باز می گردند که می توانند در رنج فرکانسی 2 تا 12 مگاهرتز کار کنند. تکنولوژی روز سعی در کوچک کردن مدارهای الکترونیکی و کمینه ...

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