![]() Intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) are known to be effective for the treatment of prostate cancer. The doses of tri-Co-60 IMRT delivered to the bladder and rectum were smaller than those of VMAT while maintaining identical target coverage in both plans. Average values of V70 Gy of the rectum of tri-Co-60 IMRT vs. In sum plans, the average values of V70 Gy of the bladder of tri-Co-60 IMRT vs. Sum plans were generated by summation of primary and boost plans. For both tri-Co-60 IMRT and VMAT, all the primary and boost plans were generated that 95% of the target volumes would be covered by the 100% of the prescription doses. VMAT had a primary planning target volume (primary CTV + 1 cm or 2 cm margins) and a boost PTV (boost CTV + 0.7 cm margins), respectively. The primary and boost planning target volumes (PTVs) of the tri-Co-60 IMRT were generated with 3 mm margins from the primary clinical target volume (CTV, prostate + seminal vesicle) and a boost CTV (prostate), respectively. The prescription doses of the primary and boost plans were 50.4 Gy and 30.6 Gy, respectively. Both primary and boost plans were generated with tri-Co-60 IMRT and VMAT techniques. Additional tri-Co-60 IMRT plans were generated for each patient. Twenty patients with intermediate-risk prostate cancer, who received radical VMAT were selected. To investigate the plan quality of tri-Co-60 intensity-modulated radiation therapy (IMRT) with magnetic-resonance image-guided radiation therapy compared with volumetric-modulated arc therapy (VMAT) for prostate cancer. Received: JAccepted: JPublished: August 08, 2017 Keywords: prostate cancer, magnetic-resonance image-guided radiation therapy, volumetric modulated arc therapy Jong Min Park 1, 2, 3, 4, So-Yeon Park 1, 2, 3, Chang Heon Choi 1, 2, 3, Minsoo Chun 1, 2, 3, Jin Ho Kim 1, 2, 3 and Jung-In Kim 1, 2, 3ġDepartment of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of KoreaĢInstitute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of KoreaģBiomedical Research Institute, Seoul National University College of Medicine, Seoul, Republic of KoreaĤRobotics Research Laboratory for Extreme Environments, Advanced Institutes of Convergence Technology, Suwon, Republic of Korea
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