نتایج جستجو برای: field digital mammography system

تعداد نتایج: 3079474  

2007
Magnus Åslund

Mammography screening aims to reduce the number of breast cancer deaths by early detection of the disease, which is one of the leading causes of deaths for middle aged women in the western world. The risk from the x-ray radiation in mammography is relatively low but still a factor in the benefit-risk ratio of screening. The characterization and optimization of a digital mammography system is pr...

Digital Breast Tomosynthesis (DBT) is a technology that creates three dimensional (3D) images of breast tissue. Tomosynthesis mammography detects lesions that are not detectable with other imaging systems. If image reconstruction time is in the order of seconds, we can use Tomosynthesis systems to perform Tomosynthesis-guided Interventional procedures. This research has been designed to study u...

Journal: :Physics in medicine and biology 2010
J L Ducote S Molloi

X-ray scatter is a major cause of nonlinearity in densitometry measurements using digital mammography. Previous scatter correction techniques have primarily used a single scatter point spread function to estimate x-ray scatter. In this study, a new algorithm to correct x-ray scatter based on image convolution was implemented using a spatially variant scatter point spread function which is energ...

Journal: :Academic radiology 2005
Elodia B Cole Etta D Pisano Donglin Zeng Keith Muller Stephen R Aylward Sungwook Park Cherie Kuzmiak Marcia Koomen Dag Pavic Ruth Walsh Jay Baker Edgardo I Gimenez Rita Freimanis

RATIONALE AND OBJECTIVES To determine the effects of three image-processing algorithms on diagnostic accuracy of digital mammography in comparison with conventional screen-film mammography. MATERIALS AND METHODS A total of 201 cases consisting of nonprocessed soft copy versions of the digital mammograms acquired from GE, Fischer, and Trex digital mammography systems (1997-1999) and convention...

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