上海市16台医用电子加速器输出量的质量控制  

Quality Control of Radiation Output of 16 Medical Accelerators in Shanghai

作　　者：赵静芳[1] 易艳玲[1] 张辉[1] 孔燕[1] 高轶名[1] 卓维海[1] 

机构地区：[1]复旦大学放射医学研究所,上海200032

出　　处：《环境与职业医学》2009年第6期553-555,共3页Journal of Environmental and Occupational Medicine

基　　金：上海市放射卫生与放射病防治重点学科建设项目(编号:08GWZX0602);上海市卫生局科研项目(编号:2007177)

摘　　要：[目的]了解上海市放射治疗医用电子加速器输出量的质量控制水平。[方法]将核查用的剂量计置于30cm×30cm×30cm水模体的水面下5cm中心处,在源点距水面100cm、照射野10cm×10cm的条件下,给予约2Gy吸收剂量的照射;计算所给予剂量与剂量计测量值的相对偏差。相对偏差≤±5%为合格。[结果]所调查的16台医用电子加速器,其预设剂量与实测剂量的相对偏差范围为-6.8%～8.1%,总合格率为87.5%。有2台机器的相对偏差超过±5%。[结论]上海市放射治疗医用电子加速器输出量合格率的总体情况良好,但仍需要加强对放射治疗技术人员的业务素质培训和监督核查。[ Objective ] To investigate the current status of dose control for radiotherapy dosimetry in Shanghai. [ Methods ] Having set the dosimeters at the central point of a field which was 5 cm beneath the surface of a water phantom（ 30cm×30cm×30cm ）, irradiate the dosimeters with an absorbed dose of about 2Gy from a source at a distance of 100cm above the Water surface with an exposure field of 10 cm ×10 cm. Calculate the relative deviation between the stated dose and measured ones, and judge the quality with a deviation limit of ＋ 5%. [ Results ] The deviations ranged from -6.8% to 8.1% among the 16 measurements, 87.5% of the accelerators passed the auditing. Even though 2 of the accelerators did not pass the quality test, their deviations were still less than 10%. [ Conclusion ] The current quality status of radiotherapy dosimetry is fairly good in Shanghai. However, further training of the technicians and auditing rules are still needed to be strengthened.

关 键 词：放射治疗剂量 质量控制 玻璃剂量计 

分 类 号：R14[医药卫生—公共卫生与预防医学]