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Proceedings Paper

Achieving high-resolution in flat-panel imagers for digital radiography
Author(s): Jeffrey T. Rahn; Francesco Lemmi; Jeng-Ping Lu; Ping Mei; Robert A. Street; Steve E. Ready; Jackson Ho; Raj B. Apte; Koenraad Van Schuylenbergh; Rachel Lau; Richard L. Weisfield; Rene Lujan; James B. Boyce
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Paper Abstract

Amorphous silicon (a-Si:H) matrix-addressed imager sensors are the leading new technology for digital medical x-ray imaging. Large-area systems are now commercially available with good resolution and large dynamic range. These systems image x-rays either by detecting light emission from a phosphor screen onto an a-Si:H photodiode, or by collecting ionization charge in a thick x-ray absorbing photoconductor with as selenium, and both approaches have been widely discussed in the literature. While these systems meet the performance needs for general radiographic imaging, further improvements in sensitivity, noise and resolution are needed to fully satisfy the requirements for fluoroscopy and mammography. The approach taken for this paper uses indirect detection, with a phosphor layer for x-ray conversion. The thin a-Si:H photodiode layer for detects the scintillation light. In contrast with the present generation of devices, which have a mesa-isolated sensor at each pixel, these imagers use a continuous sensor covering the entire front surface of the array. The p+ and i layers of a-Si:H are continuous, while the n+ contact has been patterned to isolate adjacent pixels. The continuous photodiode layer maximizes light absorption from the phosphor and provides high x-ray conversion efficiency.

Paper Details

Date Published: 6 October 1999
PDF: 10 pages
Proc. SPIE 3770, Medical Applications of Penetrating Radiation, (6 October 1999); doi: 10.1117/12.368176
Show Author Affiliations
Jeffrey T. Rahn, Xerox Palo Alto Research Ctr. (United States)
Francesco Lemmi, Xerox Palo Alto Research Ctr. (United States)
Jeng-Ping Lu, Xerox Palo Alto Research Ctr. (United States)
Ping Mei, Xerox Palo Alto Research Ctr. (United States)
Robert A. Street, Xerox Palo Alto Research Ctr. (United States)
Steve E. Ready, Xerox Palo Alto Research Ctr. (United States)
Jackson Ho, Xerox Palo Alto Research Ctr. (United States)
Raj B. Apte, Xerox Palo Alto Research Ctr. (United States)
Koenraad Van Schuylenbergh, Xerox Palo Alto Research Ctr. (United States)
Rachel Lau, Xerox Palo Alto Research Ctr. (United States)
Richard L. Weisfield, dpiX, A Xerox New Enterprise Co. (United States)
Rene Lujan, dpiX, A Xerox New Enterprise Co. (United States)
James B. Boyce, Xerox Palo Alto Research Ctr. (United States)


Published in SPIE Proceedings Vol. 3770:
Medical Applications of Penetrating Radiation
H. Bradford Barber; Hans Roehrig, Editor(s)

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