摘要目的 对Seven29TM二维电离室矩阵的剂量学性能进行评价.方法 利用同体水、IBADose 1剂量仪和RITl 13胶片剂量分析系统,对Seven29TM二维电离室矩阵进行了刻度,对其在固体水中绝对剂量和相对剂量的测量精度进行了检测与验证.同时探讨了Seven29TM二维电离宅矩阵的剂量线性和能最响应.结果 固体水是水的理想等效模体.Seven29TM二维电离窒矩阵在同体水中的刻度因子为1.007,绝对剂量的测量误差<2.1%,相对剂虽测量误差<3.8%.Seven29TM二维电离室矩阵剂量线性误差<0.2%,能昔响应误差<1.2%.结论 Seven29TM二维电离事矩阵在放疗中具有很好的剂量学特性,是开展调强放疗技术的有力工具.

abstractsObjective To evaluate the desimetrie performances of Seven29TM two-dimensional ion chamber array(2D-array).Methods Seven29TM 2D-array was calibrated by using solid water,IBA Dose 1 dosimeter and RIT 113 film dosimetry system.Tests and verifications were performed to evaluate the preci sion of absolute and relative doses of the 2D-array in solid water.Meanwhile ,the dose linear and energy re sponse of the 2D-array were studied.Results Solid water was a good equivalent phantom of water.For 2D-array,the calibration factor in solid water was 1.007 ,the absolute dose error was less than 2.1% ,the rel ative dose error was less than 3.8% and the errors of dose linear and energy response were hess than 0.2% and 1.2% ,respectively.Conclusions The Seven29TM 2D-array,possessing excellent desimetry perform ances,is a powerful tool for intensity modulated radiotherapy.