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Proceedings Paper

High-resolution (20 cycles/mm) digital x-ray mammography using amorphous selenium directly coupled to CCD readout devices
Author(s): David M. Hunter; Gueorgui Belev; Giovanni DeCresenzo; Safa O. Kasap; James G. Mainprize; Gordon Mawdsley; John A. Rowlands; Charles Smith; Tumay O. Tumer; Vladimir Verpakhovski; Shi Yin; Martin J. Yaffe
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Paper Abstract

A simple x-ray detector that utilizes amorphous selenium (a-Se) directly deposited on a specially-designed CCD (charge coupled device) with a 25 micrometer del (detector element) pitch is described. This simple detector has been used to test the feasibility of creating digital mammography detectors. To enable the use of electron transport CCDs with a-Se, we have developed a-Se hole blocking layers to permit the transfer of electrons to the CCD while suppressing hole leakage current in the presence of the high negative bias (~1000 V) required to make the a-Se x-ray sensitive. We report measurements of the charge transfer efficiency (CTE), dark signal, x-ray sensitivity, x-ray signal linearity, and x-ray MTF (modulation transfer function) of the simple detector. As the thickness of the a-Se hole blocking layer was increased, the MTF decreased. For a thin (1 micrometer) blocking layer the MTF at a spatial frequency of 20 cycles/mm was 0.4.

Paper Details

Date Published: 6 May 2004
PDF: 12 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.536001
Show Author Affiliations
David M. Hunter, Univ. of Toronto (Canada) and Women's College Health Sciences Ctr. (Canada)
Gueorgui Belev, Univ. of Saskatchewan (Canada)
Giovanni DeCresenzo, Univ. of Toronto (Canada) and Women's College Health Sciences Ctr. (Canada)
Safa O. Kasap, Univ. of Saskatchewan (Canada)
James G. Mainprize, Univ. of Toronto Sunnybrook (Canada)
Women's College Health Sciences Ctr (Canada)
Gordon Mawdsley, Univ. of Toronto Sunnybrook (Canada)
Women's College Health Sciences Ctr (Canada)
John A. Rowlands, Univ. of Toronto Sunnybrook (Canada)
Women's College Health Sciences Ctr (Canada)
Charles Smith, DALSA Inc. (Canada)
Tumay O. Tumer, NOVA R&D, Inc. (United States)
Vladimir Verpakhovski, Univ. of Toronto Sunnybrook (Canada)
Women's College Health Sciences Ctr (Canada)
Shi Yin, NOVA R&D Inc. (United States)
Martin J. Yaffe, Univ. of Toronto Sunnybrook (Canada)
Women's College Health Sciences Ctr (Canada)


Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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