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KMID : 1038720190300010014
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Progress in Medical Physics
2019 Volume.30 No. 1 p.14 ~ p.21
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Initial Experience of Patient-Specific QA for Wobbling and Line-Scanning Proton Therapy at Samsung Medical Center
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Jo Kwang-Hyun
Ahn Sung-Hwan
Chung Kwang-Zoo
Cho Sung-Koo
Shin Eun-Hyuk
Park Sey-Joon
Hong Chae-Seon
Kim Dae-Hyun
Lee Bo-Ram
Lee Woo-Jin
Choi Doo-Ho
Lim Do-Hoon
Pyo Hong-Ryull
Han Young-Yih
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Abstract
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Purpose: To report the initial experience of patient-specific quality assurance (pQA) for the wobbling and line-scanning proton therapy at Samsung Medical Center.
Materials and Methods: The pQA results of 89 wobbling treatments with 227 fields and 44 line-scanning treatments with 118 fields were analyzed from December 2015 to June 2016. For the wobbling method, proton range and spread-out Bragg peak (SOBP) width were verified. For the line-scanning method, output and two-dimensional dose distribution at multiple depths were verified by gamma analysis with 3%/3 mm criterion.
Results: The average range difference was ?0.44 mm with a standard deviation (SD) of 1.64 mm and 0.1 mm with an SD of 0.53 mm for the small and middle wobbling radii, respectively. For the line-scanning method, the output difference was within ±3%. The gamma passing rates were over 95% with 3%/3 mm criterion for all depths.
Conclusions: For the wobbling method, proton range and SOBP width were within the tolerance levels. For the line-scanning method, the output and two-dimensional dose distribution showed excellent agreement with the treatment plans.
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KEYWORD
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Proton therapy, Patient specific QA, Wobbling, Line-scanning
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