摘要
目的:评价心率、心率波动及重建时相的选择对西门子64层螺旋CT冠状动脉成像的影响。方法:51例临床疑诊冠心病或冠状动脉粥样硬化的患者,进行64层螺旋CT冠状动脉成像检查。将扫描数据从心动周期的R-R相位0～95%每间隔5%进行重建。使用西门子Syngo MMWP VE23A后处理工作站,进行容积再现、多平面重组、最大密度投影、曲面重组等处理。按扫描时平均心率及心率波动幅度分组,获得最佳重建时相,进而评价不同心率及心率波动幅度中的图像质量。结果:心率<65次/min冠状动脉最佳重建时相为60%～75%R-R间期;心率65～70次/min冠状动脉最佳重建时相为65%～70%R-R间期;心率>70次/min冠状动脉最佳重建时相为30%～40%R-R间期。图像质量随心率的增加及心率波动幅度的变大而下降。心率及心率波动幅度与图像质量呈负相关(P<0.05)。结论:西门子64层螺旋CT冠状动脉成像的图像质量受心率及心率波动幅度影响。控制心率、减小心率波动以及选择最佳重建时相可提高图像质量。
Objective： To evaluate the effect of average heart rate,heart rate variability and selection of reconstruction phase on quality of coronary angiography image by 64-slice spiral computed tomography（CT）.Methods： Fifty-one patients with suspected coronary artery disease or coronary atherosclerosis underwent CT coronary angiography using Siemens 64-slice spiral CT.Raw helical CT data were reconstructed at 0%～95% of the cardiac cycle with increments of 5% by Siemens Syngo MMWP VE23A reconstruction processing work station.The reconstruction included volume reconstruction,multi-planar reconstruction,maximum intensity projection and curved planar reconstruction.The 51 patients were divided into several groups according to the average heart rate and heart rate variability,and then select the optimal reconstruction phase and evaluate the quality of the image.Results： The optimal reconstruction phase of the coronary artery in 65 beats per min group was 60%～75%.The optimal reconstruction phase of the coronary artery in 65-70 beats per min group was 65%～70%.The optimal reconstruction phase of the coronary artery in 70 beats per min group was 30%～40%.There was a negative correlation between heart rate,heart rate variability and image quality score（P 0.05）.Conclusion： The appropriate control of heart rate and heart rate variability,and the correct selection of reconstruction phase could improve the image quality of coronary angiography.
出处
《南京医科大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第10期1501-1505,共5页
Journal of Nanjing Medical University(Natural Sciences)
关键词
64层螺旋CT
冠状动脉
心率
重建时相
图像质量
64-slice spiral computed tomography
coronary angiography
heart rate
reconstruction phase
image quality
