肺结节(直径3cm)可由多种疾病引起,其鉴别良恶性难度较大,如何用非侵袭性方法进行定性诊断一直是影像研究的热点[1,2,3]。本课题自2005年开始进行螺旋三期增强扫描对肺结节良恶性诊断价值的研究,现报告如下。1材料与方法1.1病例选择选取经胸部常规螺旋CT扫描发现肺结节(≤3cm) Pulmonary nodules (3 cm in diameter) can be caused by a variety of diseases, which are difficult to differentiate between benign and malignant. How to diagnose noninvasively using noninvasive methods has been a hot issue in imaging research [1,2,3]. The topic from 2005 on three spiral enhanced scan of benign and malignant pulmonary nodules diagnostic value, are as follows. 1 Materials and Methods 1.1 Case Selection Select the conventional chest CT scan found pulmonary nodules (≤ 3cm)