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Proceedings Paper

Amorphous selenium detector utilizing a Frisch grid for photon-counting imaging applications
Author(s): A. H. Goldan; Y. Fang; K. S. Karim; O. Tousignant; H. Mani; L. Laperrière
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Paper Abstract

Incomplete charge collection due to poor electron mobility in amorphous selenium (a-Se) results in depth-dependent signal variations. The slow signal rise-time for the portion of the induced charge due to electron-movement towards the anode and significant electron trapping cause ballistic deficit. In this paper, we investigate Frisch-grid detector design to reduce the depth dependent noise, increase the photon count-rate, and improve the spectral performance of positively biased amorphous selenium radiation detectors. In addition, we analyze the impact of using the Frisch grid detector design on x-ray sensitivity, detective quantum efficiency (DQE), modulation transfer function (MTF), and image lag of integrating-mode a-Se radiation detectors. Preliminary results based on theory are presented for emerging digital medical imaging modalities such as mammography tomosynthesis and fluoroscopy.

Paper Details

Date Published: 14 March 2009
PDF: 9 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725816 (14 March 2009); doi: 10.1117/12.813708
Show Author Affiliations
A. H. Goldan, Univ. of Waterloo (Canada)
Y. Fang, Univ. of Waterloo (Canada)
K. S. Karim, Univ. of Waterloo (Canada)
O. Tousignant, Anrad Corp. (Canada)
H. Mani, Anrad Corp. (Canada)
L. Laperrière, Anrad Corp. (Canada)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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