急性脑外伤CT、MRI敏感性,特异性比较分析

Comparative study of sensitivity and specificity between CT and MRI for acute brain trauma

目的 :比较急性脑外伤CT、MRI的敏感性和特异性。方法 :选取 1 998年 1月～ 1 999年 1 2月 1 2 2例均进行CT、MRI检查的脑外伤病例 ,且这些病例的CT、MRI诊断均得到复查或手术核实。把所获得的数据进行列表 ,分别计算敏感性和特异性。为了减少主观因素的影响 ,我们采用ROC曲线图来评价此组资料。结果 :在ROC曲线图中发现MR曲线位于CT曲线的左上方。结论 :检测急性脑外伤MR比CT更具有优越性。

Objective:To evalute the sensitivity and specificity of MRI for acute brain trauma as compared with CT.Methods:122 cases which were examined by both CT and MRI were analyzed.The CT and MRI diagnosis of these 122 cases were checked by reexamination or operation.The data which we obtained were arranged in tables,from which we could calculate the sensitivity and specificity.For reducing the influence of subjective factor,ROC diagram of curves were put to use.Results:In the ROC diagram we could find that the curve of MRI is located left upper side of the curve of CT.Conclusion:MRI is superior to CT in detecting acute brain trauma.