CT时间减影技术在肺结节检测中的应用

目的 探讨CT时间减影技术在检测肺结节中的应用价值.方法 回顾性分析80例CT图像(每例均有过去和当前的CT图像)和相应的CT减影图像,其中30例有肺结节(共75个结节)作为研究组,50例无肺结节作为对照组.2名高年资与2名低年资放射科医师分别首先分析普通CT图像,然后再同时分析普通图像与CT减影图像.阅读时诊断是否存在较前次增大、实性成分增多或者新发的结节并对诊断的肯定度进行评分.观察的结果采用受试者工作特征(ROC)曲线进行分析.结果 4名放射科医师使用CT减影图像前后的平均ROC曲线下面积(AUC)分别为0.860和0.925,两者有统计学差异(P<0.01).使用CT减影图像后,肺结节检出率由77.3%(58/75)提高到89.3%(67/75).结论 CT时间减影技术可以显著提高放射科医师的肺结节检出率,尤其是对靠近肺门的亚实性小结节,而且低年资医师受益更多.

CT temporal subtraction for detection of lung nodules

Objective To evaluate the effect of CT temporal subtraction(TS) for detection of lung nodules.Methods 80 cases of CT images (current and previous CT images) and corresponding CT TS images were presented, which included 30 cases with nodules(75 nodules) and 50 controls.4 observers, including 2 radiologists and 2 residents, indicated their confidence level regarding the presence of a new emerging or larger or solid component than before,which first used standard CT images, then with the addition of CT TS images.Receiver operating characteristic(ROC) curve analysis was used to evaluate the observers' performance.Results The mean value of the area under the ROC curve (AUC) were 0.860 and 0.925 for four observers without and with TS images,respectively(P<0.01).Average sensitivity for detection of lung nodules was improved from 77.3%(58/75) to 89.3%(67/75) by using CT TS images.Conclusion The use of CT TS images can significantly improve radiologists' performance for detection of lung nodules,especially when a small size solid or subsolid nodule presents near the pulmonary hilum.CT TS is more helpful for residents.