| 李锡雪,李东,于铁链,马延贺,李锋坦.心率及心率变异对前瞻性心电门控64层螺旋CT冠状动脉成像图像质量的影响[J].中国医学影像技术,2011,27(8):1572~1576 |
| 心率及心率变异对前瞻性心电门控64层螺旋CT冠状动脉成像图像质量的影响 |
| Impact of heart rate and heart rate variability on image quality in 64-slice CT coronary angiography with prospective ECG-triggering |
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| DOI： |
| 中文关键词: 体层摄影术,X 线计算机 冠状血管造影术 心率 心率变异 图像质量 |
| 英文关键词:Tomography, X-ray computed Coronary angiography Heart rate Heart rate variability Image quality |
| 基金项目:国家自然科学基金(30870698)。 |
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| 中文摘要: |
| 目的 探讨前瞻性心电门控64层螺旋CT冠状动脉成像中心率及心率变异对图像质量的影响。方法 80名受检者接受前瞻性心电门控扫描,检查前口服美托洛尔将心率控制在65次/分以下。以4分法对各冠状动脉段的最佳图像的质量进行评定。利用Pearson相关分析法分析心率、心率变异对图像质量的影响。结果 80名受检者均顺利完成检查,共纳入分析1039段冠状动脉,其中1003段(96.54%)满足诊断需要。平均有效剂量为(6.07±1.13)mSv。右冠状动脉、左旋支及总体图像质量与心率呈负相关(P＜0.05),左前降支、左主干图像质量与心率无显著相关性。总体及各支冠状动脉图像质量与心率变异无显著相关性。结论 前瞻性心电门控64层螺旋CT冠状动脉成像能够降低辐射剂量,当受检者心率控制在65次/分以下时,心率变异对图像质量无显著影响,但心率仍是影响图像质量的因素之一。 |
| 英文摘要: |
| Objective To evaluate the impact of heart rate (HR) and HR variability on image quality in 64-slice CT coronary angiography (CTCA) using prospective electrocardiographic (ECG) triggering.Methods Totally 80 subjects underwent CTCA using prospective ECG triggering. Betaloc was orally administered if necessary to achieve the target HR ＜65 beats/min before scanning. The image quality of all coronary segments was rated on a 4-point scale by two independent readers. The impact of HR and HR variability on image quality were analyzed with Pearson correlation. Results Totally 80 subjects underwent CTCA successfully. The estimated mean effective radiation dose was (6.07±1.13)mSv. There were 1039 coronary segments, and the imaging quality of 1003 segments (96.54%) met the diagnostic requirements. Image quality of the right coronary artery (RCA), left circumflex coronary artery (LCX), and overall coronary segments negative related to HR (P＜0.05), while no significant correlation was found between HR and image quality of the left anterior clescending coronary artery (LAD) and left main aronary artery (LM). There was no significant correlation between HR variability and image quality of each coronary artery, nor overall segments. Conclusion Prospective ECG-triggering 64-slice CTCA can reduce the radiation dose. In patients whose HR ＜65 beats/min, there is no significant impact of HR variability on image quality, while HR still plays a key role in obtaining diagnostic image quality. |
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