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RadioGraphics, Vol 15, 993-1000, Copyright © 1995 by Radiological Society of North America

ARTICLES

A real-time, flat-panel, amorphous silicon, digital x-ray imager

LE Antonuk, J Yorkston, W Huang, JH Siewerdsen, JM Boudry, Y el-Mohri and MV Marx
Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA.

As part of the development necessary for implementing a fully digital radiology department, the authors have investigated thin-film photodiodes and transistors for use in new photoelectronic imaging devices. One such device, a large-area, flat-panel, amorphous silicon imaging array, has been developed and is currently being tested. The array has a format of 512 x 560 pixels, a pixel-to-pixel pitch of 450 microns, and an area of 230 x 252 mm2, making it the largest self- scanning, solid-state imaging array developed to date. The array is used in conjunction with an overlying x-ray converter. Although specifically designed for megavoltage imaging, the device can produce high-quality, low spatial resolution, diagnostic x-ray images. Qualitative comparisons of array images of anthropomorphic head, chest, and pelvic phantoms and a spatial resolution pattern suggest that much of the information content of the film images at low spatial resolution is present in the corresponding array images. Current trends in the development of large-area, flat-panel imaging technology hold the promise of higher resolution arrays in the near future.


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