摘要
目的:评价双源CT(DSCT)前门控大螺距扫描在小儿先天性心脏病中的应用价值。方法:搜集行DSCT血管造影并经手术证实的先天性心脏病患儿67例,34例行前门控大螺距扫描(大螺距扫描组),33例行前门控序列扫描(序列扫描组)。比较两组的图像质量、有效辐射剂量及诊断效能。结果:大螺距扫描组与序列扫描组大血管图像质量评分差异无统计学意义(Z=0.123,P>0.05),大螺距扫描组心内结构和冠状动脉近中段评分低于序列扫描组,差异有统计学意义(Z=3.574、4.728,P<0.05)。两组升主动脉、主肺动脉、左心室、右心室的CT值、噪声值及信噪比差异均无统计学意义(P>0.05)。大螺距扫描组和序列扫描组平均有效辐射剂量分别为(0.36±0.08)mSv、(0.51±0.08)mSv,差异有统计学意义(t=8.200,P<0.05)。大螺距扫描组和序列扫描组对心血管畸形的诊断符合率分别为98.82%、99.09%,差异无统计学意义(χ~2=0.347,P>0.05)。结论:DSCT前门控大螺距扫描用于小儿先心病能够获得较高的图像质量和诊断符合率,且辐射剂量显著降低。
Objective：To investigate the imaging quality, radiation dose and diagnostic accuracy of prospective ECCr gated high-pitch imaging data acquisition using dual-source CT （DSCT） angiography in children with congenital heart dis- ease （CHD）. Methods：67 children with surgery confirmed CHD were included in this study. 34 children underwent DSCT angiography with high-pitch scan mode,the rest 33 cases with sequential mode. The imaging quality, effective radiation do- ses （ED）,and the diagnostic accuracy of two groups were compared. Results：There was no significant difference in image quality score of great vessels between the two groups （Z= 0. 123, P〉0.05）. The image quality of intracardiac structures and coronary arteries was significantly lower in the high-pitch group than that in the sequential group （Z= 3. 574 and 4. 728, P〈0.05）. The CT attenuation, noise and SNR in ascending aorta, pulmonary trunk,left ventricle and right ventricle had no significant difference between the two groups. Mean ED in high-pitch group and sequential group were （0.36±0.08） mSv, （0.51±0.08） mSv respectively, with significant differences （t =8. 200, P 〈 0. 05 ）. The diagnostic accuracy of high-pitch group and sequential group were 98.82%,99.09 % respectively, without significant difference （x2 = 0. 347, P〉0.05）. Conclusion：The prospective ECG-gated high-pitch acquisition of DSCT angiography provides high imaging quality and diagnostic accuracy for the assessment of CHD in children with significant lower radiation dose.
出处
《放射学实践》
北大核心
2017年第3期253-257,共5页
Radiologic Practice
关键词
先天性心脏病
双源CT血管造影
大螺距
辐射剂量
Congenital heart disease
Dual-source CT angiography
High-pitch
Radiation exposure
