真空定位袋在放疗临床应用中的剂量学研究  

Study of Vacuum Bag for Radiotherapy Dosimetry in Clinical Application

作　　者：张西志[1] 李军[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,江苏扬州225001 [2]南华大学核科学技术学院,湖南衡阳421001 [3]江苏省江都市人民医院放疗科,江苏江都225200

出　　处：《临床医学工程》2009年第3期9-10,共2页Clinical Medicine & Engineering

摘　　要：目的探讨真空定位袋在放疗中的质量保证与质量控制。方法把真空定位袋抽成真空,并使其厚度分别为1cm,3cm,5cm,10cm不等,将其置放于加速器治疗床的固体水模上,固体水模内放置剂量测量仪探头,分别用6MV和15MV高能X线进行照射,得到一组剂量仪读数,然后拿掉真空定位袋,其它条件不变,再去照射。用两组数据进行比较可求出真空定位袋的穿透因子。结果对于不同型号,不同厚度的真空定位袋,穿透因子不同。结论相同能量X线照射下,穿透因子随着真空定位袋厚度的增加而减小;相同型号和厚度的真空定位袋,穿透因子随着X射线能量的增加而增加,因此有必要对真空定位袋进行质量保证和质量控制,确保放射治疗定位和剂量计算的精度。Objective： To explore the methods of quality assurance （QA）and quality control （QC） for vacuum bag. Methods： The air in vacuum bag was exhausted by air pump and made the bag with the thickness as 1 cm, 3 cm, 5 cm, 10 cm, then put it on the solid water phantom in which there was a chamber dosimeter, and which was on the accelerator therapy table. Irradiated with 6 MV and 15 MV X-ray, got a group of dosimeter data, then took off the vacuum bag and irradiated with the same parameter. Comparing the two groups of dosimeter data and calcu- lated the penetrated factor of the vacuum bag. Result： The penetrated factors of vacuum bag were different when the thickness of the bag and the model number changed. Conclusion： The penetrated factors of vacuum bag reduced when the thickness of the bag increased, and irradiat- ing X-ray of the same energy. To the same model number and thickness of the vacuum bag, the penetrated factors increased when the X-ray en- ergy increased. It＇s important to test the vacuum bag to ensure the accuracy of radiotherapy.

关 键 词：真空定位袋 临床 放疗 剂量学 

分 类 号：R730.55[医药卫生—肿瘤]