不同大小和密度肺结节DR摄影:使用和不使用计算机辅助检测的比较

目的:评价DR摄影与计算机辅助检测对肺结节的大小和密度诊断测量的相关性.方法:选取177例(186个结节)经CT证实存在肺小结节的DR胸片和180例正常DR胸片,结节直径5～20mm.应用受试者操作特性曲线(ROC)分析未使用和使用CAD系统对不同大小(D)和密度肺结节检测结果的差异.结果:对于诊断3组不同大小(5 m...

Digital radiography of lung nodules with different size and density: detection with and without CAD

Objective：To evaluate the relationship between the size and density of lung nodules and their computer-aided detection on digital radiography.Methods：The chest digital radiographs of 177 patients with 186 lung nodules confirmed on CT and 180 normal cases as controls were enrolled in the study.The size of nodules ranged from 5 to 20mm in diameter.The receiver operating characteristic（ROC） curve was applied to analyze all the lung nodules using and not using CAD system for identifying nodules with different size and density.Results：The ROC area under the curve（AUC） increased 8.4%,5.8% and 3.9%,respectively,for the three groups with different size（5mm≤D10mm、10mm≤D15mm、15mm≤D≤20mm） using CAD system,and all the differences were statically significant（P0.05）.CAD was not sensitive for the ground-glass opacity nodules（AUC0.7）,while it had significant differences for the mixed density and solid nodules between using and not using CAD（P0.05）.Conclusion：CAD can improve the detection of lung nodules and the efficiency is related to the size and density of the nodules.