5 June 2003 Active pixel image sensor for large-area medical imaging
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karim S. Karim, Karim S. Karim, Yurii K. Vygranenko, Yurii K. Vygranenko, Alfredo Avila-Munoz, Alfredo Avila-Munoz, Denis A. Striakhilev, Denis A. Striakhilev, Arokia Nathan, Arokia Nathan, Stephen Germann, Stephen Germann, John A. Rowlands, John A. Rowlands, George Belev, George Belev, Cyril Koughia, Cyril Koughia, Robert Johanson, Robert Johanson, Safa O. Kasap, 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); doi: 10.1117/12.480254; https://doi.org/10.1117/12.480254
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