晨检仪在直线加速器日常质量控制应用中的性能研究  

Study on performance of morning check device in the application of daily quality control of medical linear accelerator

作　　者：王哲[1] 程金生[1] WANG Zhe;CHENG Jin-sheng

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中国医学装备》2018年第4期43-47,共5页China Medical Equipment

摘　　要：目的:研究比较晨检仪和剂量仪、三维水箱对医用直线加速器剂量学参数检测结果,对晨检仪的性能进行评价。方法:使用剂量仪、三维水箱测量并调整医用直线加速器剂量学参数,确保加速器束流系统稳定性;建立基准值后使用剂量仪、三维水箱和晨检仪分别测量其中心轴输出剂量、射野均整度和对称性,收集数据并比较其差异性,并将晨检仪结果与基准值进行比较,评价其性能。结果:晨检仪监测结果接近于三维水箱结果,中心轴输出剂量、左右方向均整度、枪靶方向均整度、左右方向对称性和枪靶方向对称性结果偏差最大值分别为0.87%、0.96%、0.48%、0.40%和0.59%,均在设定误差3%的范围内,符合美国医学物理师协会(AAPM)TG-142报告的要求。结论:晨检仪对医用直线加速器的日常质量控制有效且可行,可以作为日常质量控制的工具。Objective:To evaluate the performance of morning check device by comparing the dosimetric parameters of medical linear accelerators measured by radiation dosimeter,3D water phantom and morning check device.Methods:The dosimetric parameters of the linear accelerator were measured and adjusted by using dosimeter and 3D water phantom so as firstly to ensure the stability of the beam system of accelerators.After the baseline was established,the dosimeter,3D water phantom and morning check device were applied to measure central axis output dosage,and flatness and symmetry of the field,respectively.And then the data were collected and differences of the results were compared.And compared the results of morning check device with the baseline to evaluate performance of morning check device.Results:The results measured of morning check device were close to those measured by 3D water phantom.The maximum deviations of central axis output(CAX),flatness along LR direction,flatness along GT direction,symmetry along LR direction and symmetry along GT direction measured by morning check device were 0.87%,0.96%,0.48%,0.40%and 0.59%,respectively,which were in the range of 3%and could meet the requirement of AAPM TG-142 report.Conclusion:It shows that the morning check device is effective and feasible to be used for daily quality control of linear accelerators,and it can be used as tool of daily quality control.

关 键 词：晨检仪 医用直线加速器 中心轴输出量 均整度 对称性 

分 类 号：R812[医药卫生—放射医学]