Hironao Goto1, Hirokazu Mizuno2, Yuichi Akino3, Masaru Isono4, Yoshihiro Tanaka5, Norihisa Masai6, Toshijiro Yamamoto7, Masahiko Koizumi1. 1. Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine, Osaka, Japan. 2. Department of Medical Physics and Engineering, Osaka University Graduate School of Medicine, Osaka, Japan h_mizuno@radonc.med.osaka-u.ac.jp. 3. Division of Medical Physics, Osaka University Hospital Oncology Center, Osaka, Japan. 4. Department of Radiation Oncology, Osaka International Cancer Institute, Osaka, Japan. 5. Department of Radiation Therapy, Japanese Red Cross Society Kyoto Daiichi Hospital, Kyoto, Japan. 6. Miyakojima IGRT Clinic, Osaka, Japan. 7. Department of radiation therapy, Saiseikai Noe Hospital, Osaka, Japan.
Abstract
BACKGROUND/AIM: This study aimed to investigate the potential differences between multi-institutional measurements and treatment planning system (TPS) calculation modeled by representative beam data for patient-specific quality assurance (QA), including multi-leaf collimator (MLC) parameters. MATERIALS AND METHODS: Eleven TrueBeam from nine institutions were used in this study. Volumetric arc therapy (VMAT) plan for verification was created using Eclipse. The point dose of the CC13 ionization chamber and the dose distribution of the GAFCHROMIC EBT3 film were measured and analyzed. RESULTS: Point dose differences in patient-specific QA provided a mean±standard deviation of 1.0%±0.6%. Mean gamma pass rates of dose distribution were in excess of 99% and 96% for 3%/2 mm and 2%/2 mm gamma criteria, respectively. CONCLUSION: There was good agreement between measurements and calculations, indicating the small influence of complex VMAT in the underlying processes. Therefore, implementation of the same MLC parameters on TPS among different institutions with the same planning policy should be considered to ensure consistency and efficiency in radiation treatment processes. Copyright
BACKGROUND/AIM: This study aimed to investigate the potential differences between multi-institutional measurements and treatment planning system (TPS) calculation modeled by representative beam data for patient-specific quality assurance (QA), including multi-leaf collimator (MLC) parameters. MATERIALS AND METHODS: Eleven TrueBeam from nine institutions were used in this study. Volumetric arc therapy (VMAT) plan for verification was created using Eclipse. The point dose of the CC13 ionization chamber and the dose distribution of the GAFCHROMIC EBT3 film were measured and analyzed. RESULTS: Point dose differences in patient-specific QA provided a mean±standard deviation of 1.0%±0.6%. Mean gamma pass rates of dose distribution were in excess of 99% and 96% for 3%/2 mm and 2%/2 mm gamma criteria, respectively. CONCLUSION: There was good agreement between measurements and calculations, indicating the small influence of complex VMAT in the underlying processes. Therefore, implementation of the same MLC parameters on TPS among different institutions with the same planning policy should be considered to ensure consistency and efficiency in radiation treatment processes. Copyright
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