CT imaging with an image intensifier: using a radiation therapy simulator as a CT scanner

Michael D. Silver; Masayuki Nishiki; Katsumi Tochimura; Masataka Arita; Bruce M. Drawert; Thomas C. Judd

doi:10.1117/12.43447

1 July 1991 CT imaging with an image intensifier: using a radiation therapy simulator as a CT scanner

Michael D. Silver, Masayuki Nishiki, Katsumi Tochimura, Masataka Arita, Bruce M. Drawert, Thomas C. Judd

Proceedings Volume 1443, Medical Imaging V: Image Physics; (1991) https://doi.org/10.1117/12.43447
Event: Medical Imaging '91, 1991, San Jose, CA, United States

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.

Citation Download Citation

Michael D. Silver, Masayuki Nishiki, Katsumi Tochimura, Masataka Arita, Bruce M. Drawert, and Thomas C. Judd "CT imaging with an image intensifier: using a radiation therapy simulator as a CT scanner", Proc. SPIE 1443, Medical Imaging V: Image Physics, (1 July 1991); https://doi.org/10.1117/12.43447

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