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14 March 2009 Amorphous selenium detector utilizing a Frisch grid for photon-counting imaging applications
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Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725816 (2009) https://doi.org/10.1117/12.813708
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States
Abstract
Incomplete charge collection due to poor electron mobility in amorphous selenium (a-Se) results in depth-dependent signal variations. The slow signal rise-time for the portion of the induced charge due to electron-movement towards the anode and significant electron trapping cause ballistic deficit. In this paper, we investigate Frisch-grid detector design to reduce the depth dependent noise, increase the photon count-rate, and improve the spectral performance of positively biased amorphous selenium radiation detectors. In addition, we analyze the impact of using the Frisch grid detector design on x-ray sensitivity, detective quantum efficiency (DQE), modulation transfer function (MTF), and image lag of integrating-mode a-Se radiation detectors. Preliminary results based on theory are presented for emerging digital medical imaging modalities such as mammography tomosynthesis and fluoroscopy.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. H. Goldan, Y. Fang, K. S. Karim, O. Tousignant, H. Mani, and L. Laperrière "Amorphous selenium detector utilizing a Frisch grid for photon-counting imaging applications", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725816 (14 March 2009); https://doi.org/10.1117/12.813708
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