目的　探讨动态增强CT对肺癌的诊断价值。方法　选择直径≤ 4cm的孤立性肺结节 42例行动态CT增强研究 ,其中经病理及临床证实的周围型肺癌 3 0例 ,测量其增强前后各时间段扫描的CT值变化 ,绘制时间 -密度曲线 ,分析肺癌的增强特征。结果　孤立性肺结节静注碘剂 10 0ml后 ,所有肺癌均显著强化 ,分 3个类型 :均匀小结节状强化 19例 ,不均匀中心团块状强化 5例和周边不规则强化 6例。结论　动态CT增强扫描对周围型肺癌的诊断及鉴别诊断极具价值 Objective To investigate the diagnostic value of dynamic enhanced CT in lung cancer. Methods 42 patients with solitary pulmonary nodules ≤ 4 cm in diameter were enrolled in this study. Thirty patients with pathologically and clinically confirmed peripheral lung cancer were enrolled in this study. Changes of CT values ​​were measured before and after the CT scan. The time-density Curve, analysis of enhanced features of lung cancer. Results All the lung cancers were significantly enhanced after 10ml of isolated pulmonary nodules intravenous iodine, which were divided into three types: uniform nodular enhancement in 19 cases, uneven central mass enhancement in 5 cases and peripheral irregular enhancement in 6 cases . Conclusions Dynamic CT enhanced scan is of great value in the diagnosis and differential diagnosis of peripheral lung cancer