Objective To evaluate the application of dual-source CT (DSCT) using low-dose technology in diagnosing complex congenital heart diseases. Methods The DSCT data of 31 cases with complex congenital heart diseas-es conifrmed by operation were retrospectively analysed and classiifed into four groups:group A(≤4 months old, n=12); group B (>4 months old~1 year old, n=3);group C (>1 year~6 years old, n=8) and group D (>6 years old, n=8). Results The diagnosis conformation rate of DSCT with surgery were 94.59%. The diagnostic conformation rate of intracardic anormalies using DSCT was 92.86%. And the diagnostic conformation of DSCT in patients with abnormal connection of atrium or ventri-cle to great vessels and the extrocardic anormalies was 95.65%. The average effective dose in each group were 1.16±0.06 mSv, 1.28±0.07 mSv, 1.96±0.54 mSv and 2.77±0.38 mSv, respectively. The ratio of the high quality images was 90.32%. Con-clusions The application of low dose technology in DSCT can clearly display the anomalies, and signiifcantly reduce the radiation dose without losing image quality as well.%目的：探讨双源CT(DSCT)低剂量扫描技术诊断复杂性先天性心脏病的应用价值。方法回顾性分析31例复杂性先天性心脏病患儿的DSCT资料，所有患儿均经手术证实，根据患儿年龄分为，≤4个月12例，~1岁3例；~6岁8例；>6岁8例。结果 DSCT与手术后诊断的符合率为94.59%，其中心内畸形DSCT检出率为92.86%，心脏与大血管连接畸形及心外畸形DSCT检出率为95.65%；各组平均有效辐射剂量分别为(1.16±0.06)mSv、(1.28±0.07)mSv、(1.96±0.54) mSv、(2.77±0.38)mSv。图像质量良好的占90.32%。结论运用DSCT低剂量扫描技术能清晰显示复杂性先天性心脏病的心内外畸形，并能有效地降低辐射剂量，且图像质量良好。
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