中国医学装备2018，Vol.15Issue(4)：39-42,4.DOI:10.3969/J.ISSN.1672-8270.2018.04.010
医科达Synergy-S加速器多叶准直器剂量学研究
Study on the dosimetrics of multi-leaf collimator of ELEKTA Synergy-S medical linear accelerator
李军 1张西志 1张先稳 1桂龙刚 1孙新臣 2李金凯2
作者信息
- 1. 苏北人民医院放疗科 江苏 扬州 225001
- 2. 南京医科大学第一附属医院放疗中心 江苏 南京 210029
- 折叠
摘要
Abstract
Objective: To measure the leak dose and transmission dose of new type of multi-leaf collimator(MLC) of ELEKTA Synergy-S medical linear accelerator, and analyze the reasons for leak dose and transmission dose. Methods:PTW UNIDOS dosimeter and MP3 3D water tank were applied to measure leak of X-ray at inter-leaf and leaf-face of BeamModulator MLC of Synergy-S accelerator at in-water, in-air and RW3 solid phantom, respectively. Besides, the change of leak with the change of energy and rack angle also were measured. Results: Energy has a few influence for the leak of inter-leaf, while its influence was lesser for transmission dose of leaf-face. And the gravity and movement of MLC have a few influence on the transmission dose at inter-leaf. Besides, the leak rate of two detection points on the direction of off-axis was very low, and it has a trend that leak rate was decrease with the increasing of distance away from off-axis. Conclusion: With application of IMRT and VMAT, the requirement for MLC transmission also is more and more higher because machine unit of single time is very high in the using of IMRT technique on descent field or field in field. Because the existed transmission ray at inter-leaf, the machine head should be rotated according to actual situation when the radiotherapy plan is optimized, and lead door should be applied to shield important risk organ and normal tissue again so as to reduce the risk of radiation.关键词
多叶准直器/漏射/透射剂量/放射治疗/医用直线加速器Key words
Multi-leaf collimator/Leak dose/Transmission dose/Radiotherapy/Medical linear accelerator分类
医药卫生引用本文复制引用
李军,张西志,张先稳,桂龙刚,孙新臣,李金凯..医科达Synergy-S加速器多叶准直器剂量学研究[J].中国医学装备,2018,15(4):39-42,4.
