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Proceedings Paper

Basic evaluation of the local scan using a high-speed collimator
Author(s): Tetsuo Nakazawa; Osamu Miyazaki; Hiromi Kobayashi; Jyunta Harada
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Paper Abstract

We have developed The Local Scan technology, which limited the exposure field to restrain X-ray, as a low exposure technology of the X-ray CT scanner. The system contains the high speed collimator to cover X-ray, control device of high speed collimator, correction and image re-construction from the projection data by local scan technique. We have evaluated the image quality and the effect of decreasing exposure dose. Our result is as follows. Image quality of inside limited exposure field is almost the same as conventional scan image. That is, even if local scan is used, image quality does not become worse. At least, 20% of the surface exposure dose of patient decreases. We have established the basic technology of local scan from these results.

Paper Details

Date Published: 28 May 1999
PDF: 8 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349480
Show Author Affiliations
Tetsuo Nakazawa, Hitachi Medical Corp. (Japan)
Osamu Miyazaki, Hitachi Medical Corp. (Japan)
Hiromi Kobayashi, Hitachi Medical Corp. (Japan)
Jyunta Harada, Jikei Univ. School of Medicine Kashiwa Hospital (Japan)

Published in SPIE Proceedings Vol. 3659:
Medical Imaging 1999: Physics of Medical Imaging
John M. Boone; James T. Dobbins, Editor(s)

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