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Original Article

Korean Journal of Medical Physics 2006; 17(4): 192-200

Published online December 25, 2006

Copyright © Korean Society of Medical Physics.

Evaluation of the Positional Accuracy of the Delivered Beams from the Target: A Phantom Study

방사선 치료에서 치료 표적과 조사 빔의 일치 정도 평가: 팬텀 연구

Sei-Kwon Kang, Do Hoon Oh, Byung Chul Cho, Kwang-Ho Cheong, Ra Hyeong Ju, Su SSan Kim, Kyoung Ju Kim, Sang Gyu Choi, Hoonsik Bae, Rena Lee*

강세권·오도훈·조병철·정광호·주라형·김수산·김경주·최상규·배훈식·이레나*

Department of Radiation Oncology, College of Medicine, Hallym University, *Department of Radiation Oncology, Ewha Womans University College of Medicine

한림대학교 의과대학 방사선종양학교실, *이화여자대학교 의과대학 방사선종양학교실

Abstract

We evaluated the positional accuracy of the delivered beams to the target in a phantom by simulating the whole process of the radiation treatments including CT scanning, planning and beam exposures with MLCs. For this purpose, a phantom was made to calibrate the alignment between the CT and the attached laser system. A new, convenient method was also devised to align the setup lasers in the treatment room. Film was used for the identification of the delivered beam and analyzed with a homemade computer program. The positional differences between the target and the beam centers varied with the couch rotations. The accelerator we used showed a maximum discrepancy of 2.0 mm at the table angle of 295o. The same measurements based on the new isocenter from the Winston-Lutz test resulted in the maximum of 1.35 mm for all rotation angles. The evaluation of the differences between the target and the beam centers is useful for the treatment planning.

KeywordsRadiation therapy, CT simulation, Positional accuracy of beam delivery, Phantom, Winston-Lutz test

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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