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28 May 1999 Basic evaluation of the local scan using a high-speed collimator
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tetsuo Nakazawa, Osamu Miyazaki, Hiromi Kobayashi, and Jyunta Harada "Basic evaluation of the local scan using a high-speed collimator", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999);

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