14 March 2009 A counting and integrating pixel readout chip for amorphous selenium direct radiation detectors for medical imaging applications
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Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72583K (2009); doi: 10.1117/12.813730
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States
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.
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A. H. Goldan, Bahman Hadji, K. S. Karim, G. DeCrescenzo, J. A. Rowlands, O. Tousignant, L. Laperrière, "A counting and integrating pixel readout chip for amorphous selenium direct radiation detectors for medical imaging applications", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583K (14 March 2009); doi: 10.1117/12.813730; https://doi.org/10.1117/12.813730
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KEYWORDS
Sensors

Imaging systems

Selenium

Clocks

Spectroscopy

Mammography

X-rays

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