Correlation analysis between 2D and quasi-3D gamma evaluations for both intensity-modulated radiation therapy and volumetric modulated arc therapy.
The aim of this work was to investigate correlations between 2D and quasi-3D gamma passing rates. A total of 20 patients (10 prostate cases and 10 head and neck cases, H&N) were retrospectively selected. For each patient, both intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) plans were generated. For each plan, 2D gamma evaluation with radiochromic films and quasi-3D gamma evaluation with fluence measurements were performed with both 2%/2 mm and 3%/3 mm criteria. Gamma passing rates were grouped together according to delivery techniques and treatment sites. Statistical analyses were performed to examine the correlation between 2D and quasi-3D gamma evaluations. Statistically significant difference was observed between delivery techniques only in the quasi-3D gamma passing rates with 2%/2 mm. Statistically significant differences were observed between treatment sites in the 2D gamma passing rates (differences of less than 8%). No statistically significant correlations were observed between 2D and quasi-3D gamma passing rates except the VMAT group and the group including both IMRT and VMAT with 3%/3 mm (r = 0.564 with p = 0.012 for theVMAT group and r = 0.372 with p = 0.020 for the group including both IMRT and VMAT), however, those were not strong. No strong correlations were observed between 2D and quasi-3D gamma evaluations.
Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.|Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.|Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.
Jung-In
JI
Kim
Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.|Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.|Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.|Center for Convergence Research on Robotics, Advanced Institutes of Convergence Technology, Suwon, Republic of Korea.
Chang Heon
CH
Choi
Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.|Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.|Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.|Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.
Hong-Gyun
HG
Wu
Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.|Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.|Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.
Jin Ho
JH
Kim
Department of Radiation Oncology, Ewha Womans University School of Medicine, Seoul, Republic of Korea.
Kyubo
K
Kim
Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.|Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.|Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.|Center for Convergence Research on Robotics, Advanced Institutes of Convergence Technology, Suwon, Republic of Korea.
Jong Min
JM
Park
D005260:Female; D005720:Gamma Rays; D006258:Head and Neck Neoplasms / Q000532:radiotherapy; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000532:radiotherapy; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D012189:Retrospective Studies
2D gamma evaluation; intensity-modulated radiation therapy; pre-treatment patient-specific quality assurance; quasi-3D gamma evaluation; volumetric modulated arc therapy
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