心率和心率变异对双源CT冠状动脉成像质量的影响

目的:评价心率和心率变异对双源CT(DSCT)冠状动脉成像质量的影响.方法:分析2007年7月～11月间163例临床怀疑或确诊冠心病患者的DSCT冠状动脉成像检查资料,探讨最佳时相重建时心率和心率变异对双源CT冠状动脉成像质量的影响.结果:163例患者增强扫描时平均心率为(69.3±14.6)次、min(42～124次/min),平均心率变异为(7.9±4.5)次/min(1～25 次/min),最佳时相重建时,LAD图像质最与心率间无相关性,RCA、LCX和总体图像质量与心率间存在相关性(P<0.05);各支冠状动脉图像质量和总体图像质量与心率变异间无相关性.结论:DSCT冠状动脉成像能在较人的心率和心率变异范围内完成对冠状动脉的观察,高心率对图像质量仍有一定影响,但足以满足诊断.

Effect of Heart Rate and Heart Rate Variability on Image Quality of Dual-source Computed Tomography Coronary Angiography

Purpose: To evaluate the effect of heart rate and heart rate variability on image quality of dual-source computed tomography (DSCT)coronary angiography. Methods: The coronary artery imaging data of 163 patients undergoing DSCT coronary angiography from July 2007 to November 2007 were included in our study. The image quality in single best phase reconstruction and the effect of heart rate and heart rate variability on the image quality was analyzed. Results: In the contrast-enhanced scan, mean heart rate was (69.3± 14.6) beats per minute(bpm) (range, 42～124bpm) with a variability of (7.9± 4.5) bpm(range, 1 ～ 25bpm) in 163 patients, no significant correlation was found between heart rate and image quality of LAD, but there was a significant correlation (P< 0.05) between heart rate and image quality of RCA and LCX, and overall image quality, and no significant correlation was found between heart rate variability and image quality of any coronary artery or overall image quality. Conclusion: The image quality of DSCT coronary angiography is sufficient for diagnosis in a wide range of heart rate and heart rate variability, the effect of high heart rate on image quality is weak.