Active pixel image sensor for large-area medical imaging

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

doi:10.1117/12.480254

5 June 2003 Active pixel image sensor for large-area medical imaging

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

Author Affiliations +

Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003) https://doi.org/10.1117/12.480254
Event: Medical Imaging 2003, 2003, San Diego, California, United States

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.

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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, and Safa O. Kasap "Active pixel image sensor for large-area medical imaging", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); https://doi.org/10.1117/12.480254

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