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Proceedings Paper

A counting and integrating pixel readout chip for amorphous selenium direct radiation detectors for medical imaging applications
Author(s): A. H. Goldan; Bahman Hadji; K. S. Karim; G. DeCrescenzo; J. A. Rowlands; O. Tousignant; L. Laperrière
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Paper Abstract

A new pixel readout architecture is presented for amorphous selenium (a-Se) direct conversion radiation detectors. Photon-counting operation provides excellent sensitivity to low radiation doses but saturates the system at medium to high doses due to the poor charge transport properties of a-Se. Thus, we present an a-Se readout circuit design that is also capable of dynamically operating in integrating mode to enable the detection of high-dose radiation. This extends the resolvable dynamic range of the imaging system from very low gamma-ray count rates to very high flux x-ray radiations. The readout circuit is very promising for applications such as mammography tomosynthesis, and its benefits can also be extended to other radiation detectors. Finally, we present preliminary spectroscopy results with a-Se.

Paper Details

Date Published: 14 March 2009
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583K (14 March 2009); doi: 10.1117/12.813730
Show Author Affiliations
A. H. Goldan, Univ. of Waterloo (Canada)
Bahman Hadji, Univ. of Waterloo (Canada)
K. S. Karim, Univ. of Waterloo (Canada)
G. DeCrescenzo, Thunder Bay Regional Research Institute, Lakehead Univ. (Canada)
J. A. Rowlands, Thunder Bay Regional Research Institute, Lakehead Univ. (Canada)
O. Tousignant, 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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