Performance evaluation of a retrofit digital detector-based mammography system |
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| Affiliation: | 1. Department of Radiation Oncology, Mayo Clinic, 200 First St. SW, Rochester, MN 55901, USA;2. Department of Radiation Oncology, Mayo Clinic Hospital, 5777 E. Mayo Blvd., Phoenix, AZ 85054, USA;1. Division of Biomedical Imaging, University of Leeds, Leeds, UK;2. University of Pisa and INFN Pisa, Pisa, Italy;3. Department of Physics, National and Kapodistrian University of Athens, Athens, Greece;1. Dept. of Medical Physics and Radiation Protection, University Hospital Olomouc, Olomouc, Czech Republic;2. Faculty of Medicine and Dentistry, Palacky University Olomouc, Olomouc, Czech Republic;3. Dept. of Nuclear Medicine, University Hospital Olomouc, Olomouc, Czech Republic |
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| Abstract: | ![]()
A retrofit flat panel detector was integrated with a GE DMR+ analog mammography system and characterized using detective quantum efficiency (DQE). Technical system performance was evaluated using the European Guidelines protocol, followed by a limited evaluation of clinical image quality for 20 cases using image quality criteria in the European Guidelines. Optimal anode/filter selections were established using signal difference-to-noise ratio measurements. Only small differences in peak DQE were seen between the three anode/filter settings, with an average value of 0.53. For poly(methyl methacrylate) (PMMA) thicknesses above 60 mm, the Rh/Rh setting was the optimal anode/filter setting. The system required a mean glandular dose of 0.54 mGy at 30 kV Rh/Rh to reach the Acceptable gold thickness limit for 0.1 mm details. Imaging performance of the retrofit unit with the GE DMR+ is notably better than of powder based computed radiography systems and is comparable to current flat panel FFDM systems. |
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