PC MR法测量主动脉血流准确性的临床研究

目的：评价磁共振相位对比法（PC MR）测量主动脉血流的准确性.方法：由2位医师先后2次对11例正常志愿者的左心室及主动脉起始部的MR数据进行测量、分析,获得主动脉起始部心动周期内的净血流量（即每搏输出量,SV）,并与左心室短轴位MR电影中左心室舒张期和收缩期容积的改变（SV）进行比较,探讨PC MR法测量主动脉血流的准确性;并观察上述两种方法在检查及后处理过程中所花费的时间,以及受测量者个体的影响情况.结果：PC MR法测量主动脉起始部所获得左心室的SV与左心室短轴位MR电影测量的结果具有良好的一致性（r=0.92）;PC MR法测量SV花费时间较少、受测量者的影响小.结论：PC MR法能准确测量主动脉的血流,并能快速获得SV等左心室功能评价的指标.

Assessment of accuracy of aorta blood flow measured by using PC MR

Objective：To evaluate the accuracy of phase contrast （PC） MR in measuring the blood flow of aorta.Method：Eleven cases of blood flow in the beginning of aorta of the healthy volunteers were measured by using PC MR,and the stroke volume which was derived from the change of left ventricle within each cardiac cycle were measured by short axis cine MRI.The values of stroke volume by the two methods were analysed and compared.We compared the time that cost in scanning and post-processing of the two methods.Results：There were good consistency between net blood flow volume of aorta measured by using PC MR with that of left ventricle by short axis cine MRI （r=0.92）.It took less time to scan and post-process imaging by using PC MR than short axis cine MRI.There was less inter-observer and intra-observer influence by using PC MR.Conclusion：PC MR is a noninvasive,safe,accurate method.It is a good way in research the blood flow dynamics of aorta by using PC MR,and can assess left ventricular systolic function.