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Proceedings Paper

Semiconductor materials for digital mammography
Author(s): James Gordon Mainprize; Nancy L. Ford; Shi Yin; Tumay O. Tumer; Eli Gordon; William J. Hamilton; Martin Joel Yaffe
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Paper Abstract

Digital mammography has demanding imaging requirements, including very high spatial resolution (50 micrometer) and SNR. To make efficient use of the radiation dose, it is also desirable that the DQE of the image receptor is high. To achieve these requirements, a prototype CCD read-out has been designed, which is hybridized to a semiconductor array to form a direct conversion detector that can be employed in a slot- scanned digital x-ray imaging system. The image quality of the detectors in which the CCD is hybridized to either a silicon photodiode array or a CdZnTe photoconductor array has been measured. A 1 mm thick silicon device has shown a DQE(f) of 0.64 at 0 mm-1, falling to 0.14 at 10 mm-1 in the slot direction (20 keV). The CdZnTe hybrid device is very thin (150 micrometer) and has a theoretical DQE in excess of 0.9 at 20 keV. The resolution of the CdZnTe device is excellent, with an experimental MTF that is limited only by the detector element size, and the TDI scanning technique. However, the experimental DQE is lower than predicted, believed to be due to crystal non-uniformity, and excessive carrier trapping. Future work will investigate the improvement in image quality obtainable by using a very high purity single-crystal CdZnTe device.

Paper Details

Date Published: 25 April 2000
PDF: 7 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384488
Show Author Affiliations
James Gordon Mainprize, Sunnybrook & Women's College Health Sciences Ctr./Univ. of Toronto (Canada)
Nancy L. Ford, Sunnybrook & Women's College Health Sciences Ctr./Univ. of Toronto (Canada)
Shi Yin, Nova R&D, Inc. (United States)
Tumay O. Tumer, Nova R&D, Inc. (United States)
Eli Gordon, Raytheon Infrared Ctr. for Excellence (United States)
William J. Hamilton, Raytheon Infrared Ctr. for Excellence (United States)
Martin Joel Yaffe, Sunnybrook & Women's College Health Sciences Ctr./Univ. of Toronto (Canada)


Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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