钴^(60)放射治疗设备的质量保证

Quality Assurance Items and Verified Methods of Mechanism of Cobalt Radiotherapy Equipment

目的:跟踪检验使用长达8年之久的进口Theratron公司生产钴60放射治疗设备机械参数的不确定度,探索钴60治疗机机械误差、质控检测方法和QA要求。方法:对我科使用的Theratron公司生产钴60治疗机每周对设备进行质控检测,尤其注重机械方面,统计和分析检验的结果。结果:全年50周工作日所检测机器的机械等中心未发现误差超标,灯光野等中心误差发生率为19次(误差标准均为1mm直径球体);光距离刻度指示的误差次数达6次,其余项目的误差发生率均≤4次。结论:所检进口Theratron公司生产钴60治疗机一般情况下,设备的机械等中心每半年检验一次即可,但修理机头准直器后必须重新校准;更换灯光器件时,灯光野等中心、光距离刻度指示的精度每周应检验1-2次,及时校正;其余项目应每1-2个月至半年检测一次,必要时需作调整校准。提出必要的检验项目和检查的频率,各放疗中心应对本中心使用的设备进行定期检验和校正,并可据此制定适合本单位实际情况的QA检验规范和指标,以保证常规放射治疗的精度。

Objective： To investigate parameter of the Mechanism of Cobalt Radiotherapy Equipment for T780 ＆ Phoenix by used 8 years. To explore the error of the mechanism and methods of check and quality assurance request of the cobalt radiotherapy equipment. Methods： TO stat and analyze result of check up in every weeks for t780e and phoenix. Results： Mechanism physical problem of radiotherapy equipments were not found of QA check. Light field problem were found in 3.Optical distance indicator problem were found in 6 mistakes and error in prescription were found to be 6%. Conclusion： Center error of Mechanism of Cobalt Radiotherapy Equipment were little （≤ 1mm ）. Usually, Check once were finish in every year. But need emendation mistake after repair for head of equipment.