IAEA法测量医用直线加速器输出剂量

Measurement of output dose of medical linear accelerator with IAEA regulation

目的:探讨用IAEA法对加速器输出剂量的计算和测量程序寻求准确、快捷、有效的测量方法。方法:按IAEA规程确定各测量参数值,将吸收剂量计算公式化简成仪表读数乘以总校正因子的形式。输出剂量的测量先在水体模中按标准条件进行,再移植到有机玻璃体模中,使输出剂量的监测更方便。结果:对我院PRIMUS加速器66周的输出剂量测量结果统计,误差在1%以内的达85%以上,其它基本保持在2%以内。结论:此测量方法可以满足直线加速器实施精确放疗对输出剂量的误差要求。

Objective To probe an accurate, rapid and effective method for the calculation and measurement of output dose of the accelerator with IAEA regulation. Methods The parameter value of measurement was determined according to IAEA regulations, and absorbed dose calculation forma was briefed to the form that the reading of instrument multiplies cumulative correction factor. The output dose was measured in water phantom on sandard condition, and then regrafted into plexiglass phantom, which made the measurement more convenience. Results Staistics of measurement had been done to PRIMUS accelerator in 66 weeks output dose. Over 85% of the measurement had the error less then 1%, and others were less then 2%. Conclusion This measurement can be used for the measuremen of output dose in precise radiotherapy of linear accelerator.