한국의학물리학회:학술대회논문집 (Proceedings of the Korean Society of Medical Physics Conference)
- 한국의학물리학회 2002년도 Proceedings
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- Pages.189-191
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- 2002
Quality Assurance System for Determination of Center Position in X-ray and Proton Irradiation Fields using a Stainless Ball and Imaging Plates in Proton Therapy at PMRC
- Yasuoka, Kiyoshi (Proton Medical Research Center(PMRC), University of Tsukuba, Japan) ;
- Ishikawa, Satoko (Proton Medical Research Center(PMRC), University of Tsukuba, Japan)
- 발행 : 2002.09.01
초록
In the proton therapy using a gantry system, periodical verification of iso-center position is very important to assure precision of patient positioning system at any gantry angles in proton treatment. In the gantry system, there are three different types of iso-center; 1) in a geometrical view, 2) in an X-ray beam's eye view, 3) in a proton beam's eye view. Idealistically, they would be an identical point. They could, however, be different points. It may be a source of errors in patient positioning. At PMRC, we have established a system of verification for iso-center positions using a stainless ball of 2-cm in diameter and an imaging plate. This system provides the relation among a center of a patient target position, a center of proton irradiation field, and/or a center of X-ray field in accuracy of 50