低剂量与薄层扫描螺旋CT在检出肺结节中的研究

目的:探讨低剂量、薄层及常规剂量螺旋CT扫描在检出和诊断肺结节中是否存在显著差异。方法:对72例体检经常规剂量扫描中发现肺结节病人行肺部低剂量和局部薄层螺旋CT扫描,所得图像分别按<5mm,5mm～10mm,>10mm不同大小分组记录结节数目,并记录结节形状、内部特征以及边缘特点及形态,结节内钙化,支气管征、界面征及邻近改变等,并部分做出定性诊断,再与动态增强扫描及病理结果相对照。结果:低剂量、薄层与常规剂量螺旋CT扫描三者在检测肺结节的数目、肺结节内部与周边特征差异无显著性,而薄层螺旋CT扫描技术对结节的检测结果在总体上略占优势,但是三者在定性诊断方面均有差异。结论:低剂量加薄层螺旋CT扫描技术值得在人群普查、肺结节检出中推广应用,但仍需努力提高其诊断的准确性。

Study of the Detection of Pulmonary Nodules with Low-dose and Thin-sectionSpiral CT Scans

Objective To explore if there is significant difference in the detection and diagnosis of pulmonary nodules with low-dose,thin-section and conventional dose spiral CT scan.Methods Low-dose and local thin-section spiral CT scans were performed in 72 patients with pulmonary nodules detected on conventional dose spiral,CT scans during health examina- tion.The images abtaincd were devided into three groups,that is<5mm,5mm～10mm,>10 mm,according to the size of the nodules.The number,shape,interior characteristics,feature of borderline,calcification of the nodules,bronchus sign,inter- face sign and the changes of the neighboring structures were analyzed and qualitative diagnosis was made partly.And then com- pare the results with those of dynamic contrast enhancement scans.Results No significant difference in the detection of the nodule number,interior and perimeter feature existed between low-dose and conventional dose spiral CT scans.While thin- section spiral CT scanning technique was obviously superior to low-dose and conventional dose spiral CT scans in that.But significant difference existed in the qualitative diagnosis among the three scanning techniques.Conclusion:Low-dose with thin -section spiral CT scanning technique is worth being applied to the detection of pulmonary nodules in general investigation. But further efforts should be made to elevate diagnostic accuracy.