第3代双源CT低剂量技术在高心率冠脉成像中的应用

目的:分析第3 代双源CT 低剂量扫描方案应用于高心率患者冠状动脉成像的图像质量及辐射剂量.方法:收集102 例接受第3 代双源CT 冠状动脉成像检查的患者,扫描时采用前瞻性心电门控,并且选取CARE kV"on"模式调节管电压.根据心率(Heart Rate,HR)将患者分为3 组:A 组(36 例):HR≤70 次...

Comparison of low-dose coronary CT angiography in patients with high heart rate using third-generation dual-source CT

Objective:To compare the image quality and ionized-radiation dose of low-dose coronary CT angiography in patients with different heart rates using third-generation dual-source CT.Methods:One hundred and two patients who underwent coronary angiography by the third-generation dual-source CT were enrolled in the study.All images were acquired by the prospective ECG gated technique,with the CARE kV"on"mode to adjust the tube voltage.The patients were divided into 3 groups according to heart rate(HR):group A(n=36):HR≤70 bpm,group B(n=35):70 bmp90 bmp.The dose of contrast was 0.6 mL/kg,and injection rate was volume/10(mL/s).The effective radiation dose,noise and signal noise ratio(SNR)were compared.Besides,CT value and contrast noise ratio(CNR)of coronary arteries were also analyzed.The image quality on a per-vessel basis was judged(both on a scale 1-4,with 4 being the best).Results:The effective radiation dose in group A was(1.3±0.7)mSv,which was significantly lower than that in group B(2.1±0.9)mSv](P=0.001).No other significant difference in quantitative image quality was found among the three groups(P>0.05).Mean segment-based image quality scores showed no significant difference between the three groups(P>0.05).The evaluation rates of coronary artery segments in group A(99.23%)was the best(group B,99.03%and group C,98.21%).Conclusion:Third-generation dual-source CT low-dose scan protocol provides high image quality for patients with different heart rates.Moreover,it can greatly reduce ionized-radiation dose.