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Proceedings Paper

Design, optimization and evaluation of a “smart” pixel sensor array for low-dose digital radiography
Author(s): Kai Wang; Xinghui Liu; Hai Ou; Jun Chen
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Paper Abstract

Amorphous silicon (a-Si:H) thin-film transistors (TFTs) have been widely used to build flat-panel X-ray detectors for digital radiography (DR). As the demand for low-dose X-ray imaging grows, a detector with high signal-to-noise-ratio (SNR) pixel architecture emerges. “Smart” pixel is intended to use a dual-gate photosensitive TFT for sensing, storage, and switch. It differs from a conventional passive pixel sensor (PPS) and active pixel sensor (APS) in that all these three functions are combined into one device instead of three separate units in a pixel. Thus, it is expected to have high fill factor and high spatial resolution. In addition, it utilizes the amplification effect of the dual-gate photosensitive TFT to form a one-transistor APS that leads to a potentially high SNR. This paper addresses the design, optimization and evaluation of the smart pixel sensor and array for low-dose DR. We will design and optimize the smart pixel from the scintillator to TFT levels and validate it through optical and electrical simulation and experiments of a 4x4 sensor array.

Paper Details

Date Published: 4 April 2016
PDF: 7 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 978362 (4 April 2016); doi: 10.1117/12.2216780
Show Author Affiliations
Kai Wang, SYSU-CMU Shunde International Joint Research Institute (China)
SYSU-CMU Joint Institute of Engineering (China)
Xinghui Liu, SYSU-CMU Shunde International Joint Research Institute (China)
Hai Ou, Sun Yat-sen Univ. (China)
Jun Chen, Sun Yat-sen Univ. (China)

Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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