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目的：研究低剂量螺旋 CT 扫描在肺癌早期诊断中的临床应用。方法对常规剂量 CT （100 mA —200 mA）肺部检查发现肺部肿块的60例患者，应用低剂量 CT （40 mA 、30 mA 、20 mA）进一步筛查评估，分别统计肺癌诊断准确率。结果常规剂量 CT 对肺癌诊断准确率为78．7％，低剂量 CT40 mA 、30 mA 、20 mA组对肺癌诊断准确率分别为75．6％、70．3％、55．6％；低剂量 CT40 mA 组、低剂量 CT30 mA 组与常规剂量 CT 组肺癌诊断准确率比较差异无显著性（χ2＝0．12、0．79，P＞0．05），低剂量 CT20 mA 组与常规剂量 CT 组肺癌诊断准确率比较差异有显著性（χ2＝5．09，P＜0．05）结论低剂量螺旋 CT （30 mA）扫描有较高的敏感性，较低的辐射量，可用于肺癌早期筛查。“,”Objective To survey clinical application of low‐dose CT scanning in early diagnosis of lung cancer .Methods Further screenings and assessments were carried out using low‐dose CT (40 mA ,30 mA and 20 mA) in 60 patients with lung mass discovered by standard‐dose CT (120‐200 mA) ,diagnostic accu‐racy rates of lung cancer added up respectively .Results Diagnostic accuracy rate of lung cancer by stand‐ard‐dose CT ,those of low‐dose CT of 40 mA ,30 mA and 20 mA were 75 .6% ,70 .3% and 55 .6% respec‐tively .There were no significant differences in diagnostic accuracy rates of lung cancer among low‐dose CT of 40 mA ,of 30 mA and standard‐dose CT (χ2 = 0 .12 ,0 .79 ,P> 0 .05) and was a significant difference in that between low‐dose CT of 20 mA and standard‐dose CT (χ2 = 5 .09 ,P < 0 .05) .Conclusion Low‐dose spiral CT (30 mA) scanning has higher sensitivity and lower radiation ,could be used in the early screening of lung cancer .