国产XHA1400加速器的剂量稳定性测试  

Dose Stability Test of Domestic Accelerator XHA1400

作　　者：高文超 王军良 杨林 解传滨 戴相昆 曲宝林 GAO Wenchao;WANG Junliang;YANG Lin;XIE Chuanbin;DAI Xiangkun;QU Baolin(Department of Radiotherapy,The Fifth Medical Center,Chinese PLA General Hospital,Beijing 100853,China;Department of Radiotherapy,The First Medical Center,Chinese PLA General Hospital,Beijing 100853,China)

机构地区：[1]中国人民解放军总医院第五医学中心放疗科,北京100853 [2]中国人民解放军总医院第一医学中心放疗科,北京100853

出　　处：《中国医疗设备》2021年第4期70-75,共6页China Medical Devices

摘　　要：目的通过对国产XHA1400加速器输出剂量的主要参数进行测试,评估其剂量输出系统的稳定性。方法利用Daily QA3晨检仪对XHA1400加速器进行检测,包括中心轴输出剂量(Dose)、射野对称性(Axsym、Trsym)、射野平坦度(QAFlat)、射线能量(X-Energy、E-Energy)、射野大小(XSize、YSize)及射野偏移(XShift、YShift)。回顾性分析连续三个月Daily QA3晨检仪的测量数据,给出各个参数变化趋势和变化幅度。结果Daily QA3晨检仪检测发现6、10 MV X线的射野对称性、能量稳定性差,偏差均超过2%,其中Txsym稳定性最大偏差分别为2.61%(6 MV)、2.46%(10 MV),X-Energy稳定性最大偏差分别为4.86%(6 MV)、3.65%(10 MV),各档能量其他检测参数稳定性较好。更换电离室后,6、10 MV X线的Axsym、X-Energy稳定性恢复正常,各档能量其他检测参数也均在小范围内波动,保持较高的稳定性。结论使用Daily QA3晨检仪对XHA1400进行检测有利于确保其稳定性及准确性,更换电离室后XHA1400具有良好的输出稳定性,能够满足临床应用需求。Objective Through monitoring the main parameters of dose output to evaluate the stability of domestic accelerator XHA1400.Methods The Daily QA3 device was used to detect XHA1400 accelerator,including central axis dose(Dose),field symmetry(Axsym,Trsym),field flatness(QAFlat),field energy(X-Energy,e-Energy),field size(XSize,YSize),and field shift(XShift,YShift).The monitoring results of three consecutive months for accelerator by Daily QA3 were retrospectively analyzed,and finally obtain the stability change trend and range of each parameter.Results The Daily QA3 device revealed that the Trsym and X-Energy of 6 MV and 10 MV X-ray had a low stability performance,with deviation over 2%.The maximum deviations of stability of the Trsym were:2.61%(6 MV),2.46%(10 MV),respectively.And the maximum deviations of stability of the X-Energy were:4.86%(6 MV),3.65%(10 MV).Other monitoring parameters of different energies showed a high stability performance.After the replacement of ionization chamber,the monitoring of Daily QA3 revealed that the Trsym and X-Energy of 6,10 MV X-ray returning to normal deviation.The energy of each grade and other detection parameters also fluctuated in a small range to maintain a high stability.Conclusion Using Daily QA3 device to measure the accelerator XHA1400 can ensure the accuracy and stability.The accelerator XHA1400 shows a high stability performance after the replacement of ionization chamber,which can meet the clinical requirement.

关 键 词：Daily QA3晨检仪 国产加速器 输出稳定性 XHA1400 

分 类 号：R730.8[医药卫生—肿瘤]