CT剂量计校准装置长度准直器缝宽和倒角对散射的影响  

Analysis of length collimator slit width and chamfering effect on scattering in calibration for CT dosemeter

作　　者：白雪[1] 袁杰[1] 孙训[1] 胡崇庆 Bai Xue;Yuan Jie;Sun Xun;Hu Chongqing(Shanghai Institute of Measurement and Testing Technology)

机构地区：[1]上海市计量测试技术研究院

出　　处：《上海计量测试》2023年第4期53-54,57,共3页Shanghai Measurement and Testing

摘　　要：诊断水平CT剂量计空气比释动能长度乘积值的校准测量需使用长度准直器,其狭缝散射是影响CT剂量计校准因子准确性的重要因素。设计制作长度准直器,采用影锥法开展不同缝宽和不同倒角下的散射剂量测量实验,结果表明,长度准直器的倒角与X射线束的辐射角相等、狭缝宽度在30~40mm之间时,散射剂量及其变化最小。A length Collimator is used to calibrate the value of air kerma length product of diagnostic CT dosimeter.Slit scattering is an important factor affecting the accuracy of the calibration factor of CT dosimeter.The length Collimator was designed and manufactured.The shadow shield method was used to measure the scattering dose under different slit widths and different chamfer angles.The results showed that when the chamfer of the length collimator was equal to the radiation angle of the X-ray beam and the slit width was between 30 mm and 40 mm,the scattering dose and its variation were the least.

关 键 词：长度准直器 倒角 影锥法 散射 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] R318[自动化与计算机技术—计算机科学与技术]