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Proceedings Paper

CT imaging with an image intensifier: using a radiation therapy simulator as a CT scanner
Author(s): Michael D. Silver; Masayuki Nishiki; Katsumi Tochimura; Masataka Arita; Bruce M. Drawert; Thomas C. Judd
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Paper Abstract

The authors use a Toshiba LX-40A Radiation Therapy Simulator with a 14' (35.6 cm) image intensifier and a 1' saticon camera to collect data for computed tomography (CT) imaging. The custom designed data acquisition system is interfaced with a 386-PC and the LX-40A to allow the LX-40A to perform as a CT scanner under PC control. The motion versatility of the simulator allows fields of view (FOV) greater than 40 cm with a single 360 degree(s) rotation of the gantry. Distortion and other corrections are applied to give relatively artifact-free images. A visible resolution performance of 7 lp/cm is obtained throughout the FOV. One percent contrast targets are visible down to 3 mm for head-sized objects, though contrast sensitivity depends, of course, on many scan parameters. An objective of this research is to give CT functionality to a radiation therapy simulator; this eliminates the need for a conventional, diagnostic CT scanner for radiation therapy planning. Extensions to multislice and volume CT are possible.

Paper Details

Date Published: 1 July 1991
PDF: 11 pages
Proc. SPIE 1443, Medical Imaging V: Image Physics, (1 July 1991); doi: 10.1117/12.43447
Show Author Affiliations
Michael D. Silver, Bio-Imaging Research, Inc. (United States)
Masayuki Nishiki, Toshiba Corp. (Japan)
Katsumi Tochimura, Toshiba Corp. (Japan)
Masataka Arita, Toshiba Corp. (Japan)
Bruce M. Drawert, Bio-Imaging Research, Inc. (United States)
Thomas C. Judd, Bio-Imaging Research, Inc. (United States)


Published in SPIE Proceedings Vol. 1443:
Medical Imaging V: Image Physics
Roger H. Schneider, Editor(s)

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