心率对双源CT冠脉成像质量及延迟时间影响

目的: 探讨双源CT检查冠状动脉中,心率对图像质量及延迟时间的影响。方法: 回顾性分析2009年10月~2010年1月在我院接受双源CT冠状动脉造影检查的310例患者资料,根据美国心脏病学会(AHA)的指导原则把冠脉分成15段。每例图像均经三维工作站处理重建后,由两名有经验的放射科医生对图像质量评分,按受检时心率分5组,分别统计各组冠脉各段图像质量评分及延迟时间。结果: ①图像显示成功率为99.9%(4540/4544),优良率95.8%(4356/4544)。②当心率≥90次/min时,RCA、LAD、LCX三支冠脉图像质量均下降明显。③心率≥90次/min延迟时间随心率增加而增加,当心率≤90次/min延迟时间随心率增加减少。结论: 在自然心率状态下,99%患者双源CT冠状动脉成像能满足临诊断要求,但是图像质量及扫描延迟时间仍然受到心率影响。

The Influence of Heart Rate on Image Quality and Delay Time of DSCT Coronary Angiography

Objective:Evaluated the influence of heart rate on image guality and delay time of dual-source computed tomography(DSCT)coronary Angiography.Methods:310 patients were divided into five groups according to their heart rate(heart rate≤59 beat/bpm,heart rate≤69,heart rate≤79 beat/bpm,heart rate≤89 beat/bpm and heart rate≥90 beat/bpm),and image quality and delay time of coronary arteries was evaluated for all patients.Results:99.9%(4 540/4 544)sements reached diagnostic.In group 2,3,4,5,image quality of coronary arteries had negative correlation with heart rate.In group 1,2,3,4,delay time also negative correlation with heart rate.Conclusion:Excellent coronary artery image could be obtained with dual-source CT without oral Betaloc preparation,but heart rate is also the most important factor that influences image quality and delay time.