目的探究CT平扫与三期增强扫 描在对肺结节的诊断中的应用价值。方 法 采用回顾性分析的方法对我院2016年6 月-2017年5月收治的56例患者进行研究分 析，56例患者入院后两周内都行CT平扫和 三期增强扫描，并经手术、病理检查进行 确诊为肺部结节性病变。结果 51例患者 中良性结节组26例和恶性结节组30例；CT 平扫良、恶性肺结节平均CT值比较，差异 无统计学意义(P>0.05)；CT增强扫描60s 良、恶性肺结节的平均CT值比较，差异 存统计学意义(P<0.05)，增强扫描15s、 30s所测的CT值比较均无统计学意义(P＞ 0.05)。以最大CT净增值20～60HU为恶性 结节，测得CT三期增强扫描对恶性结节诊 断的敏感性为92.86%、特异性为86.73%、 诊断准确性为81.46%。结论 CT平扫与三 期增强扫描在肺结节中具有较高的诊断准 确性，且对良性和恶性具有一定的鉴别诊 断价值。

Objective To investigate diagnostic value of CT plain scan and Tri-phase Enhancement scan in pulmonary nodules. Methods Used to analyze 56 patients our hospital from 2016 May-2017 June were selected to study by A retrospective analysis. Patients were treated with CT plain and three enhanced scan for two weeks after admission, and were diagnosed as pulmonary nodular lesions by surgical and pathological examination. Results There were 26 cases of benign nodules patients and malignant nodules patients in 51 cases. Comparing the average CT value by CT plain, there was no difference between benign nodules and malignant nodules (P>0.05), and compared with benign nodules, the average CT value of malignant pulmonary nodules by CT enhanced scan 60s benign was alleviated significantly (P<0.05). There was no statistically significant difference between the CT values of enhanced scan 15s and 30s (P>0.05). The CT added value between 20-60 HU was treated as malignant nodules. The sensitivity of the CT three phase enhanced scan to the diagnosis of malignant nodules was 92.86%, the specificity was 86.73%, and the diagnostic accuracy was 81.46% by measuring maximum net value of CT between 20-60HU of malignant nodule. Conclusion CT plain scan and three phase enhanced scan have high diagnostic accuracy in pulmonary nodules, and have certain differential diagnosis value for benign and malignant.