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Proceedings Paper

Active pixel image sensor for large-area medical imaging
Author(s): Karim S. Karim; Yurii K. Vygranenko; Alfredo Avila-Munoz; Denis A. Striakhilev; Arokia Nathan; Stephen Germann; John A. Rowlands; George Belev; Cyril Koughia; Robert Johanson; Safa O. Kasap
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Paper Abstract

The most widely used pixel architecture is a passive pixel sensor (PPS) where the pixel consists of a detector and an a-Si:H thin-film transistor readout switch. While the PPS has the advantage of being compact and amenable towards high-resolution imaging, the data line capacitance, resistance, and the column charge amplifiers add a large noise component to the PPS that reduces the minimum readable sensor input signal. Building upon previous research into active pixel sensor (APS) based amplified pixel readout circuits, this work investiates a current-mediated APS (C-APS) x-ray detection array for diagnostic medical imaging applications. Preliminary tests indicate linear performance, and a programmable circuits gain via choice of supply voltage and sampling time. In addition, the performance of C-APS amplified pixels is measured from both, a-Si TFT metastability and noise performance perspectives. Theory and measurements indicate that the C-APS pixel architecture is promising for diagnostic medical imaging modalities including low noise, real-time fluoroscopy.

Paper Details

Date Published: 5 June 2003
PDF: 10 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480254
Show Author Affiliations
Karim S. Karim, Univ. of Waterloo (Canada)
Yurii K. Vygranenko, Univ. of Waterloo (Canada)
Alfredo Avila-Munoz, Univ. of Waterloo (Canada)
Denis A. Striakhilev, Univ. of Waterloo (Canada)
Arokia Nathan, Univ. of Waterloo (Canada)
Stephen Germann, Sunnybrook and Women's College Health Sciences Ctr. (Canada)
John A. Rowlands, Sunnybrook and Women's College Health Sciences Ctr. (Canada)
George Belev, Univ. of Saskatchewan (Canada)
Cyril Koughia, Univ. of Saskatchewan (Canada)
Robert Johanson, Univ. of Saskatchewan (Canada)
Safa O. Kasap, Univ. of Saskatchewan (Canada)


Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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