Semiconductor materials for digital mammography

James Gordon Mainprize; Nancy L. Ford; Shi Yin; Tumay O. Tumer; Eli Gordon; William J. Hamilton; Martin Joel Yaffe

doi:10.1117/12.384488

25 April 2000 Semiconductor materials for digital mammography

James Gordon Mainprize, Nancy L. Ford, Shi Yin, Tumay O. Tumer, Eli Gordon, William J. Hamilton, Martin Joel Yaffe

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384488
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

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.

Citation Download Citation

James Gordon Mainprize, Nancy L. Ford, Shi Yin, Tumay O. Tumer, Eli Gordon, William J. Hamilton, and Martin Joel Yaffe "Semiconductor materials for digital mammography", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384488

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