Park Jong Min, Park So-Yeon, Chun Minsoo, Kim Sang-Tae
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 Hospital, Seoul, Republic of Korea; Center for Convergence Research on Robotics, Advanced Institutes of Convergence Technology, Suwon, Republic of Korea.
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 Hospital, Seoul, Republic of Korea.
Phys Med. 2017 Aug;40:110-114. doi: 10.1016/j.ejmp.2017.07.021. Epub 2017 Aug 4.
To investigate and improve the domestic standard of radiation therapy in the Republic of Korea.
On-site audits were performed for 13 institutions in the Republic of Korea. Six items were investigated by on-site visits of each radiation therapy institution, including collimator, gantry, and couch rotation isocenter check; coincidence between light and radiation fields; photon beam flatness and symmetry; electron beam flatness and symmetry; physical wedge transmission factors; and photon beam and electron beam outputs.
The average deviations of mechanical collimator, gantry, and couch rotation isocenter were less than 1mm. Those of radiation isocenter were also less than 1mm. The average difference between light and radiation fields was 0.9±0.6mm for the field size of 20cm×20cm. The average values of flatness and symmetry of the photon beams were 2.9%±0.6% and 1.1%±0.7%, respectively. Those of electron beams were 2.5%±0.7% and 0.6%±1.0%, respectively. Every institutions showed wedge transmission factor deviations less than 2% except one institution. The output deviations of both photon and electron beams were less than ±3% for every institution.
Through the on-site audit program, we could effectively detect an inappropriately operating linacs and provide some recommendations. The standard of radiation therapy in Korea is expected to improve through such on-site audits.
调查并提高大韩民国国内放射治疗水平。
对大韩民国的13家机构进行了现场审核。通过对各放射治疗机构的现场走访，调查了六个项目，包括准直器、机架和治疗床旋转等中心检查；灯光与辐射野的重合度；光子束平坦度和对称性；电子束平坦度和对称性；物理楔形滤过器传输因子；以及光子束和电子束输出。
机械准直器、机架和治疗床旋转等中心的平均偏差小于1毫米。辐射等中心的偏差也小于1毫米。对于20cm×20cm的射野尺寸，灯光与辐射野的平均差值为0.9±0.6毫米。光子束平坦度和对称性的平均值分别为2.9%±0.6%和1.1%±0.7%。电子束的平均值分别为2.5%±0.7%和0.6%±1.0%。除一家机构外，各机构的楔形滤过器传输因子偏差均小于2%。各机构光子束和电子束的输出偏差均小于±3%。
通过现场审核计划，我们能够有效检测出运行不当的直线加速器并提供一些建议。预计通过此类现场审核，韩国的放射治疗水平将会提高。
