体位固定系统对临床放疗剂量影响的研究  

The Effects of the Body Positioning System on Clinical Radiotherapy Dosimeter

作　　者：李军[1] 张西志[1] 汪步海[1] 谭飞[1] 茅冬俊[1] 申珊珊[2] 陈永东[3] 

机构地区：[1]江苏省苏北人民医院放疗科,扬州225001 [2]南华大学核科学技术学院,衡阳421001 [3]江苏省江都市人民医院放疗科,225200

出　　处：《医学研究杂志》2008年第11期100-101,共2页Journal of Medical Research

摘　　要：目的探讨体位固定系统在放疗中的质量保证与质量控制。方法将体位固定材料放置于固体水模上,固体水模中心放置剂量测量仪的电离室,分别用6MV和15MVX线进行照射,得到一组剂量仪读数,然后拿掉体位固定材料,其他条件不变,再去照射,对两组数据进行比较,可得出体位固定材料对X线的穿透因子,结果对不同能量的X线与不同体位固定材料所得的穿透因子也不同。结论对于相同的体位固定材料,穿透因子随着X射线能量的增加而增加,要确保放射治疗定位和剂量的精度,对于体位固定材料要合理使用,在临床中需对处方剂量进行必要的修正与补偿。Objective To explore the methods of quality assurance （QA） and quality control （QC） of the body positioning system in Radiotherapy. Methods Put the body positioning stuff on the solid water phantom and the chamber dosimeter in center of the solid water phantom,and which was on the accelerator therapy table. Irradiated with 6MV and 15MV X - ray,got a group of dosimeter data,then took off the body positioning system and irradiated with the same condition. Comparing the two groups of dosimeter data and calculated the penetrated factor of the body positioning stuff. Results The penetrated factors of the body positioning stuff are different as the different energy of X - ray or stuff are not same. Conclusion For the body positioning stuff,the penetrated factors are increased when the X - ray energy is increased. It＇ s important to guarantee the precise of body positioning and dosimeter in radiotherapy. Reasonable apply the positioning stuff,amend and compensate the medical prescription dosimetry in clinical.

关 键 词：体位固定系统 放疗 剂量 影响 

分 类 号：R735.1[医药卫生—肿瘤] R144.1[医药卫生—临床医学]