이화의대, 울산의대 / 최동혁, 김동욱, 안소현*, 안우상*
Abstract
Our study recalculated the use factor of linear accelerators (LINACs) by using an in-house program based on Digital Imaging and Communications in Medicine radiation therapy (DICOM-RT). We considered the impact of advancements and changes in treatment trends, including modality, technology, and radiation dose, on the use factor, which is one of the shielding parameters. In accordance with the methodology described in the NCRP 151 report, we computed the use factor for four linear accelerators (LINACs) across three hospitals. We analyzed the results based on the treatment techniques and treatment sites for three-dimensional conformal radiation therapy (3D-CRT) and intensity modulated radiation therapy or volumetric modulated arc therapy. Our findings revealed that the use factors obtained at 45° and 90° were 14.8% and 13.5% higher than those of the NCRP 151 report. In treatment rooms with a high 3D-CRT ratio, the use factor at a specific angle differed by up to 14.6% relative to the NCRP 151 report value. Our results showed a large difference in the use factor for specific sites such as the breast and spine, so it is recommended that each institution recalculate the use factor using patient's data.
Affiliations
Dong Hyeok Choi # 1 2 3, Dong Wook Kim # 1 2 3, So Hyun Park 4, So Hyun Ahn 5, Woo Sang Ahn 6, Rena Lee 7, Jin Sung Kim 1 2 3
1Department of Medicine, Yonsei University College of Medicine, Seoul, Korea.
2Medical Physics and Biomedical Engineering Lab (MPBEL), Yonsei University College of Medicine, Seoul, South Korea.
3Department of Radiation Oncology, Heavy Ion Therapy Research Institute, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea.
4Department of Radiation Oncology, Jeju National University Hospital, Jeju University College of Medicine, Jeju, Republic of Korea.
5Ewha Medical Research Institute, School of Medicine, Ewha Womans University, Seoul, Republic of Korea. mpsohyun@gmail.com.
6Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Republic of Korea. anidol@ulsan.ac.kr.
7Department of Biomedical Engineering, School of Medicine, Ewha Womans University, Seoul, South Korea.
#Contributed equally.