心率变异率对3.0T磁共振自由呼吸全心冠状动脉成像图像质量的影响  

Effect of heart rate variability on image quality of 3D free-breathing whole-heart coronary MR angiography with 3.0T scanner

作　　者：于兵[1] 孙红彬[2] 侯阳[1] 郭启勇[1] 

机构地区：[1]中国医科大学附属盛京医院放射科,辽宁沈阳110004 [2]中国医科大学附属第四医院放射科,辽宁沈阳110032

出　　处：《中国医学影像技术》2010年第2期282-284,共3页Chinese Journal of Medical Imaging Technology

摘　　要：目的观察3.0T磁共振自由呼吸全心冠状动脉成像过程中平均心率(HR)及心率变异对图像质量的影响。方法应用Philips3.0TMR,采用节段k空间采集梯度回波序列对65名健康志愿者行自由呼吸回顾性心电门控全心磁共振冠状动脉成像(MRCA)检查。心率变异的程度用HR的标准差占R-R间期的百分比表示。由2名有经验的放射科医生对各冠状动脉近端的MRCA图像质量进行评分(1分:优秀;2分:良好;3分:一般;4分:无诊断意义)。采用Pearson相关性分析检验各冠状动脉平均HR及心率变异与MRA图像质量的相关性。结果65名健康志愿者的平均HR为(64.5±13.3)次/分,心率变异为(6.1%±2.6)%。HR与右侧冠状动脉(P<0.05)以外的各支冠状动脉近端MRA的图像质量无相关性(P>0.05),心率变异与各支冠状动脉的图像质量均显著相关(P<0.001)。结论心率变异对3.0T自由呼吸MR-CA图像质量的影响较HR更为显著。Objective To observe the effect of the average heart rate （HR） and the variability of HR on image quality of 3D free-breathing whole-heart coronary MR angiography （MRCA）. Methods A total of 65 healthy volunteers underwent retrospectively electrocardiography-gated 3D free-breathing whole-heart coronary MRA with ECG-gated 3D segmented-kspace gradient echo sequence. Two observers evaluated image quality of each coronary segment. Visualization of the proxi- mal coronary arteries （CA） with coronary MRA was qualitatively evaluated using a four point grading scale （1： excellent; 2： good; 3： moderate; 4： non-diagnostic）. Pearson correlation analysis was performed to analyze the correlation between image quality of each coronary artery and the average HR and heart rate variability. Results Average HR was 64.5± 13.3 beats per minute （bpm） （range 40-86 bpm） with a variability of （6.1% ±2.6） %. No significant correlation presented between mean HR and image quality of all segments of the left circumflex and left anterior descending artery except the right coronary artery （P〈 0. 05）. heart rate variability significantly correlated with overall image quality （P〈0. 001） and image quality of each coronary artery. Conclusion heart rate variability influences the image quality of 3D free-breathing coronary MRA more obvious than HR does.

关 键 词：磁共振血管成像 冠状血管 心律 图像质量 

分 类 号：R445.2[医药卫生—影像医学与核医学] R332[医药卫生—诊断学]