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目的:应用受试者工作特征(ROC)曲线对比评价超声和磁共振对胎儿胼胝体的诊断价值。方法:选取侧脑室轻度扩张胎儿26例,四位受试者分别根据超声与磁共振图像对是否为胼胝体发育不全作出分级诊断,后根据诊断结果绘制四位受试者的ROC曲线,计算四位受试者的曲线下面积,对其进行统计检验。同时,分别计算超声和磁共振阅片时,两位受试者之间Kappa系数,以评估受试者之间的一致性。结果:超声检查获取两位受试者的ROC曲线下面积分别为0.859和0.869,磁共振检查获取两位受试者的曲线下面积为0.915和1,四条曲线下面积差异无显著性意义(P>0.05);超声和磁共振诊断时,两位受试者之间的Kappa系数分别为0.733和0.830。结论:磁共振较超声诊断胎儿胼胝体发育不全的准确性和一致性高,但超声对胎儿胼胝体发育不全亦有较高诊断价值,当超声不能明确诊断,磁共振可以作为胎儿胼胝体发育不全时的补充诊断手段。
OBJECTIVE: To evaluate the diagnostic value of ultrasound and magnetic resonance to the fetal corpus callosum by using the receiver operating characteristic (ROC) curves. Methods: Twenty-six fetuses with mild dilatation of the lateral ventricle were selected. Four subjects were classified according to ultrasound and magnetic resonance imaging (MRI) respectively. The ROC curves of four subjects were drawn according to the diagnostic results. Subjects under the curve of the area, its statistical test. At the same time, Kappa coefficients between two subjects were calculated separately for ultrasound and magnetic resonance readings to assess the coherence between subjects. Results: The area under the ROC curve of the two subjects obtained by ultrasound was 0.859 and 0.869 respectively. The area under the curve of the two subjects obtained by magnetic resonance imaging was 0.915 and 1. There was no significant difference in the area under the four curves (P > 0.05). The Kappa coefficients of the two subjects were 0.733 and 0.830 for the diagnosis of ultrasound and MRI, respectively. Conclusions: The accuracy and consistency of MR diagnosis of fetal corpus callosum hypoplasia are high. However, ultrasonic diagnosis of fetal corpus callosum also has high diagnostic value. When ultrasound can not confirm the diagnosis, MR can be used as fetal hypoplastic corpus callosum hypoplasia. Diagnostic methods.