Department of Medicine, Yonsei University College of Medicine, Seoul, Korea.
Medical Physics and Biomedical Engineering Lab (MPBEL), Yonsei University College of Medicine, Seoul, South Korea.
Phys Eng Sci Med. 2023 Sep;46(3):1043-1053. doi: 10.1007/s13246-023-01272-1. Epub 2023 Jul 20.
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.
我们使用基于数字成像和通信在医学放射治疗（DICOM-RT）的内部程序重新计算了直线加速器（LINAC）的使用因子。我们考虑了治疗趋势的进步和变化对使用因子的影响，包括治疗方式、技术和辐射剂量，使用因子是屏蔽参数之一。根据 NCRP 151 报告中描述的方法，我们为三家医院的四台直线加速器（LINAC）计算了使用因子。我们根据三维适形放射治疗（3D-CRT）和调强放射治疗或容积调强弧形治疗的治疗技术和治疗部位分析了结果。我们的发现表明，在 45°和 90°处获得的使用因子比 NCRP 151 报告中的值高 14.8%和 13.5%。在 3D-CRT 比例较高的治疗室中，特定角度的使用因子与 NCRP 151 报告值相差高达 14.6%。我们的结果表明，特定部位（如乳房和脊柱）的使用因子存在很大差异，因此建议每个机构使用患者数据重新计算使用因子。
