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Proceedings Paper

Improved page-size 127-um-pixel amorphous-silicon image sensor for x-ray diagnostic medical imaging applications
Author(s): Richard L. Weisfield; Robert A. Street; Raj B. Apte; Andrew M. Moore
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Paper Abstract

This paper introduces a new high-resolution amorphous silicon (a-Si) image sensor specifically configured to demonstrate medical x-ray imaging capabilities. This new imager has an active pixel area of 243.84 mm X 195.072 mm, a pixel size of 127 micrometers X 127 micrometers , and an array size of 1536 data lines by 1920 gate lines, with over 2.95 million pixels. We have introduced a number of improvements both to the a-Si array itself and to the surrounding electronics to obtain a light sensitive area of 57 percent and a dataline capacitance of approximately 55 pF, which together provide enhanced signal/noise ratio. We have incorporated charge-sensitive amplifiers and 12 bit A/D converters, enabling us to achieve a sufficiently large dynamic range for medical imaging applications. We report on imager performance, including Signal/Noise, Modulation Transfer Function, and summarize other imaging characteristics. We compare these characteristics as a function of different x-ray phosphors and discuss avenues for future improvement.

Paper Details

Date Published: 2 May 1997
PDF: 8 pages
Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); doi: 10.1117/12.273983
Show Author Affiliations
Richard L. Weisfield, dpiX, a Xerox Co. (United States)
Robert A. Street, Xerox Palo Alto Research Ctr. (United States)
Raj B. Apte, Xerox Palo Alto Research Ctr. (United States)
Andrew M. Moore, Xerox Palo Alto Research Ctr. (United States)

Published in SPIE Proceedings Vol. 3032:
Medical Imaging 1997: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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