MSCT实时造影剂跟踪技术在冠状动脉成像中的临床优选研究

目的:研究16层螺旋CT冠状动脉成像中的实时造影剂跟踪触发技术(Surestart)的最佳阈值。方法:60例患者行冠状动脉增强扫描。分别对照不同触发扫描CT阈值和心率下的冠状动脉成像效果,a组心率<70次/min,b组心率>70次/min。按从优到劣A、B、C3个质量等级,逐一对照2种检查方法图像质量并进行统计学分析。结果:160HU触发扫描组b组图像质量优,180HU组a组图像质量优。结论:Surestart最佳阈值为:以4.0ml/s为注射流率,心率<70次/min的CT阈值为180HU;心率大于>70次/min的CT阈值为160HU。

Optimization Study of MSCT Surestart Tracking and Triggering Technique for Imaging of Coronary Artery

Objective To investigate the optimum threshold value of tracking and triggering technique (surestart) in imaging of coronary artery by 16-slice row CT. Methods 60 patients enrolled in the enhanced scan of coronary artery imaging were divided into 2 groups (group a : heart rate < 70 beats/per minute; group b: heart rate >70 beats/per minute ). The quality of images collected under different threshold value and heart rate was compared. The image quality of coronary artery was ranked by 3 levels, namely, level A, B and C. The data were statistically analyzed. Results The image quality triggered by 160 HU of group b was level A. The image quality triggered by 180 HU of group a was level A. Conclusion The optimum surestart is 180 HU when the heart rate <70 beats/per minute and the injection rate is 4.0ml/s. The optimum CT trigger threshold would be 160 HU when the heart rate is>70 beats/per minute.