CR与DR系统胸部摄影参数对比的实验研究

目的：比较CR、DR在胸部摄影中的最优化摄影参数。方法：CR、DR系统分别对胸部等效衰减模体行不同参数曝光成像,记录每次曝光的模体表面剂量,并计算模体影像图像质量因子反数值IQFinv。应用统计学软件分析获取CR组、DR组最佳图像的IQFinv值,并换算成摄影参数。结果：CR组、DR组摄影剂量和图像质量IQFinv值之间的线性回归方程为DR：IQFinv=0.005D＋3.359,CR：IQFinv=0.005D＋1.651,D为辐射剂量。ROC曲线分析（曲线下面积AUC=0.893,P〈0.001）,最佳IQFinv值为3.55,获得DR、CR最佳图像摄影参数分别为125 kV、1.6 mAs,125 kV、16 mAs。结论：要得到满足诊断要求且一致的图像质量,CR的摄影剂量大致是DR的4倍。

A comparative experimental study of CR vs DR in chest radiography parameter

Objective：To optimize the parameters in chest radiography on CR and DR.Methods：The chest phantom was exposed in different radiation dose on DR and CR.The radiation dose of the phantom was recorded by dosimeter and the value of IQFinv was analyzed.The best IQFinv value of DR and CR was obtained by statistical software,and then the radiography condition of DR and CR was calculated.Results：The linear regression equation for DR was IQFinv =0.005D＋3.359,and for CR was IQFinv=0.005D＋1.651,where D was radiation dose.On ROC,the under curve area was 0.893,P〈0.001.From ROC,the optimized IQFinv value was 3.55,where the exposure condition of DR was 125kV,1.6mAs and CR was 125kV,16mAs.Conclusion：The radiation dose of CR is four times to DR for same image quality.