摘要
目的探讨MOSFET探测器在全身放疗质量控制中的价值。方法在源轴距360 cm处使用电离室对MOSFET探测器进行标定,同时根据体模入射面、出射面与中间层面的剂量换算关系,利用标定后的MOSFET探测器检测行全身放疗患者的辐射剂量,控制并减少相应误差。结果 10个MOSFET探测器中,有7个最大偏差均<3%,另3个经再次重新标定后,最大偏差亦<3%,均可用于临床测量。结论在全身放疗中应用MOSFET探测器能够起到监测治疗剂量、控制误差的作用。
Objective To investigate the application value of MOSFET detector in the quality control of total body irradiation. Methods To demarcate the radiation dose of MOSFET detector with ionization chamber at 360 cm SAD. To detect the radiation dose of patients during total body irradiation by using demarcated MOSFET detector in order to control and reduce measuring errors according to the conversion relationship among incident surface, exit surface and intermediate layer of the model. Results Among all MOSFET detectors （10 cases）, the maximum dose deviation （〈3%） can meet clinical requirements in 7 cases and the maximum dose deviation （〈3%） also can meet clinical requirements in 3 cases which are demarcated again. Conclusion The radiation dose can be monitored and measuring errors can be controlled with the application of MOSFET detector in total body irradiation.
出处
《中国医疗设备》
2014年第1期117-118,140,共3页
China Medical Devices
