ECG电流调制技术在冠状动脉CTA中的应用价值

The clinical application value of electrocardiograph modulated milliampere in the coronary CT angiography

目的:评价心电图(electrocardiograph,ECG)电流调制技术在冠状动脉CTA中的应用价值。方法:84例行冠状动脉CT血管造影(CT Angiography,CTA)检查的患者随机分为A、B两组,每组42例,A组采用传统方式扫描,B组采用ECG电流调制技术。对两种扫描所得图像的质量、噪声、CT剂量指数(CT dose index,CTDl)有效剂量(effective dose ED)进行统计学分析。结果:两组图像质量评分及噪声评分分别为:A组(3.58±0.22)分和(23.13±3.45)分,B组(3.56±0.25)分和(23.27±3.32)分,两组间差异不明显(P>0.05)。A组CTDI和ED分别为:(93.03±4.32)mGy和(35.53±2.01)mSv,B组为(58.36±3.24)mGy和(20.00±2.77)mSv,B组的辐射剂量较A组明显降低(P<0.01)。结论:在不明显影响图像质量的情况下,ECG电流调制技术能有效降低冠状动脉CTA辐射剂量,可以作为冠状动脉CTA的常规辅助技术。

Objective：To evaluate the clinical application value of electrocardiograph modulated milliampere in the coronary computer tomography angiography.Methods：84 patients under CTA were randomly divided into two groups,group A with conventional scan served as control,and group B employed electrocardiograph modulated milliampere scan.Image quality,noise,CT dose index（CTDI） and effective dose（ED） of the two groups were statistical analyzed respectively.Results：The image quality scores and noise scores of the two groups were：（3.58±0.22） points and（23.13±3.45） points in group A,and（3.56±0.25） points and （23.27±3.32） points in group B,there were no significant difference between A and B（P〉0.05）.The CTDI and ED in the two groups were：A（93.03±4.32） mGy and （35.53±2.01） mSv,B（58.36±3.24） mGy and（20.00±2.77） mSv respectively,the radiation doses in group B were significantly lower than A（P〈0.01）.Conclusion：Technique of electrocardiograph modulated milliampere can reduce radiation doses effectively in coronary CTA,it can be a routine assistive technique for coronary CTA.