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Proceedings Paper

Photon counting pixel and array in amorphous silicon technology for large area digital medical imaging applications
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Paper Abstract

A single photon counting Voltage Controlled Oscillator (VCO) based pixel architecture in amorphous silicon (a-Si) technology is reported for large area digital medical imaging. The VCO converts X-ray generated input charge into an output oscillating frequency signal. Experimental results for an in-house fabricated VCO circuit in a-Si technology are presented and external readout circuits to extract the image information from the VCO's frequency output are discussed. These readout circuits can be optimized to reduce the fixed pattern noise and fringing effects in an imaging array containing many such VCO pixels. Noise estimations, stability simulations and measurements for the fabricated VCO are presented. The reported architecture is particularly promising for large area photon counting applications (e.g. low dose fluoroscopy, dental computed tomography (CT)) due to its very low input referred electronic noise, high sensitivity and ease of fabrication in low cost a-Si technology.

Paper Details

Date Published: 18 March 2010
PDF: 10 pages
Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76221A (18 March 2010); doi: 10.1117/12.844420
Show Author Affiliations
Mohammad Y. Yazdandoost, Univ. of Waterloo (Canada)
Kyung W. Shin, Univ. of Waterloo (Canada)
Nader Safavian, Univ. of Waterloo (Canada)
Farhad Taghibakhsh, Sunnybrook Health Sciences Ctr. (Canada)
Univ. of Toronto (Canada)
Karim S. Karim, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 7622:
Medical Imaging 2010: Physics of Medical Imaging
Ehsan Samei; Norbert J. Pelc, Editor(s)

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