数字化晨检仪的研制  

Development of the Digital Morning Check Device

作　　者：张咏波[1] 陈立新[2] ZHANG Yong-bo;CHEN Li-xin(Department of Equipment;Department of Radiotherapy, State Key Laboratory of Oncology in Southern China (Cancer Center of Sun Yat-sen University),Guangzhou Guangdong 510060, China)

机构地区：[1]华南肿瘤学国家重点实验室(中山大学肿瘤防治中心)设备科,广东广州510060 [2]华南肿瘤学国家重点实验室(中山大学肿瘤防治中心)放疗科,广东广州510060

出　　处：《中国医疗设备》2017年第4期42-45,共4页China Medical Devices

基　　金：广东省教育部产学研重点项目(2012B091000144)

摘　　要：目的研制用于直线加速器输出量晨检的数字化晨检仪。方法采用单个平板电离室作为探测器,与PIC16F877单片机处理器等构成数字化检测系统。按照JJG912-2010对治疗型电离室剂量检定的要求,在直线加速器下进行输出剂量测量,对系统的剂量学特性进行测试。结果在常规的跳数检测范围内(50~400 MU),晨检仪的测量剂量线性较好,线性拟合的相关系数均近似为1,最大偏差为0.4%。单次测量中,其测量重复性的最大偏差好于0.3%。对于不同剂量率的响应,其最大偏差小于0.3%。在半年检测过程中,其稳定性好于1%。结论研制晨检仪的剂量特性符合JJG912-2010《治疗水平电离室剂量计》的要求,可用于直线加速器输出量的晨检。Objective To develop a digital device for measuring the dose output of medical accelerator in the morning check. Methods It was constructed by a single tablet ionization chamber and PIC16F877 single chip processor. The measurement of output dose under the medical accelerator was performed according to the document of JJG912-2010, and the dosimetry characteristics of the medical accelerator was tested by morning check device. Results In the range of 50～400 MU, the measured dose was linear.The correlation coefficients of linear fitting were approximately 1.00 and the maximum deviation was smaller than 0.4%. In a single measurement, the maximum deviation of measurement repeatability was better than 0.3%. The maximum deviation was less than 0.3% for different dose rates. In the long-term (half-year) testing process, the reproducibility of device was better than 1%. Conclusion Dosimetry characteristics of the device can meet the requirements of JJG912-2010 Verification Regulation of Ion Chamber Dosimeters Used in Radiotherapy. The research and development of the device can be used to measure the relative dose of the Linac in daily tests.

关 键 词：放射治疗 直线加速器 电离室 剂量特性 单片机处理器 晨检仪 

分 类 号：TH789[机械工程—仪器科学与技术] TL53[机械工程—精密仪器及机械]