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Imaging performance of amorphous selenium based flat-panel detectors for digital mammography: Characterization of a small area prototype detector

2003; Wiley; Volume: 30; Issue: 2 Linguagem: Inglês

10.1118/1.1538233

2473-4209

Wei Zhao, Winston G. Ji, Anne Debrie, J. A. Rowlands,

Advanced X-ray and CT Imaging

Medical PhysicsVolume 30, Issue 2 p. 254-263 Radiation imaging physics Imaging performance of amorphous selenium based flat-panel detectors for digital mammography: Characterization of a small area prototype detector Wei Zhao, Wei Zhao Department of Radiology, State University of New York at Stony Brook, L-4 Health Sciences Center, Stony Brook, New York 11794-8460Search for more papers by this authorW. G. Ji, W. G. Ji Imaging Research, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, CanadaSearch for more papers by this authorAnne Debrie, Anne Debrie Anrad Corporation, 4950 Levy Street, Saint-Laurent, Quebec H4R 2P1, CanadaSearch for more papers by this authorJ. A. Rowlands, J. A. Rowlands Imaging Research, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, CanadaSearch for more papers by this author Wei Zhao, Wei Zhao Department of Radiology, State University of New York at Stony Brook, L-4 Health Sciences Center, Stony Brook, New York 11794-8460Search for more papers by this authorW. G. Ji, W. G. Ji Imaging Research, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, CanadaSearch for more papers by this authorAnne Debrie, Anne Debrie Anrad Corporation, 4950 Levy Street, Saint-Laurent, Quebec H4R 2P1, CanadaSearch for more papers by this authorJ. A. Rowlands, J. A. Rowlands Imaging Research, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, CanadaSearch for more papers by this author First published: 23 January 2003 https://doi.org/10.1118/1.1538233Citations: 99AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Our work is to investigate and understand the factors affecting the imaging performance of amorphous selenium flat-panel detectors for digital mammography. Both theoretical and experimental methods were developed to investigate the spatial frequency dependent detective quantum efficiency of a-Se flat-panel detectors for digital mammography. Since the K edge of a-Se is 12.66 keV and within the energy range of a mammographic spectrum, a theoretical model was developed based on cascaded linear system analysis with parallel processes to take into account the effect of K fluorescence on the modulation transfer function (MTF), noise power spectrum (NPS), and of the detector. This model was used to understand the performance of a small-area prototype detector with 85 μm pixel size. The presampling MTF, NPS, and of the prototype were measured, and compared to the theoretical calculation of the model. The calculation showed that K fluorescence accounted for a 15% reduction in the MTF at the Nyquist frequency of the prototype detector, and the NPS at was reduced to 89% of that at zero spatial frequency. The measurement of presampling MTF of the prototype detector revealed an additional source of blurring, which was attributed to charge trapping in the blocking layer at the interface between a-Se and the active matrix. This introduced a drop in both presampling MTF and NPS at high spatial frequency, and reduced aliasing in the NPS. As a result, the of the prototype detector at approached 40% of that at zero spatial frequency. The measured and calculated using the linear system model have reasonable agreement, indicating that the factors controlling image quality in a-Se based mammographic detectors are fully understood, and the model can be used to further optimize detector imaging performance. Citing Literature Volume30, Issue2February 2003Pages 254-263 RelatedInformation