نتایج جستجو برای: tomosynthesis
تعداد نتایج: 1112 فیلتر نتایج به سال:
Objective: to evaluate the available data of Breast tomosynthesis as a complementary tool of direct digital mammography. Methods: a systematic literature search of original and review articles through pubmed was performed. we reviewed the most important aspects of tomosynthesis in breast imaging: Results: 36 original articles, 13 review articles and the fda and american College of radiology sta...
The objective of this study was to assess the effect of antiscatter grid use on tomosynthesis image quality. We performed an observer study that rated the image quality of digital tomosynthesis scout radiographs and slice images of a Leeds TO.20 contrast-detail test object embedded in acrylic with and without a grid. We considered 10, 15, 20 and 25 cm of acrylic to represent the wide range of p...
The radiation dose involved in any medical imaging modality that uses ionizing radiation needs to be well understood by the medical physics and clinical community. This is especially true of screening modalities. Digital breast tomosynthesis (DBT) has recently been introduced into the clinic and is being used for screening for breast cancer in the general population. Therefore, it is important ...
This paper presents the Malmö Breast Tomosynthesis project. The tomosynthesis equipment is described as well as the patient selection and image acquisition. Special focus is given to one of the studies of the project, which is a comparison of the diagnostic performance between breast tomosynthesis (BT), digital mammography (DM) and ultrasonography (US): Tumor classification according to the BIR...
Tomosynthesis imaging requires projection images from different viewing angles. Conventional systems use a moving xray source to acquire the individual projections. Using a stationary distributed x-ray source with a number of sources that equals the number of required projections, this can be achieved without any mechanical motion. Advantages are a potentially faster image acquisition speed, hi...
PURPOSE The purpose of this work is to characterize the spatial dependence of the in-plane 35 modulation transfer function (MTF) in tomosynthesis and investigate the influence of the acquisition geometry. METHODS The in-plane MTF was calculated from measured edge spread functions using a custom 40 test tool consisting of a 0.250 mm thick lead sheet affixed to a 5.88 mm acrylic sheet. Images wer...
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Filtered back-projection (FBP) has been commonly used as an efficient and robust reconstruction technique in tomographic X-ray imaging during the last decades. For limited angle tomography acquisitions such as digital breast tomosynthesis, however, standard FBP reconstruction algorithms provide poor results and give rise to image artifacts due to the limited angular range and the coarse angular...
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