中文摘要：

目的 应用计算流体力学（CFD）方法结合MR血管成像（MRA）显示并分析在体颈动脉分叉的血流模式。方法 选取7例受检者，采用Siemens Trio型3．0TMR仪，行颈动脉MR增强血管成像（CEMRA）检查，扫描所得原始图像经计算机后处理，并采用CFD方法计算并显示该段血管的血流模式。结果 7例受检者该血管段的血流模式随心动周期的不同期相呈现周期性变化，在颈动脉分叉及颈内动脉和颈外动脉的近端外侧部均可见血液涡流与回流，其出现与否及形态随心动周期的不同期相而变化，随着血液流向颈内和颈外动脉远端，该涡流与回流逐渐消失。结论 应用CFD方法结合MRA能显示颈动脉分叉血液的血流模式随心动周期的变化情况。

英文摘要：

Objective To investigate flow patterns at carotid bifurcation in vivo by combining computational fluid dynamics （CFD）and MR angiography imaging. Methods Seven subjects underwent contrast-enhanced MR angiography of carotid artery in Siemens 3.0 T MR. Flow patterns of the carotid artery bifurcation were calculated and visualized by combining MR vascular imaging past-processing and CFD. Results The flow patterns of the carotid bifurcations in 7 subjects were varied with different phases of a cardiac cycle. The turbulent flow and back flow occurred at bifurcation and proximal of internal carotid artery （ICA） and external carotid artery （ECA）, their occurrence and conformation were varied with different phase of a cardiac cycle. The turbulent flow and back flow faded out quickly when the blood flow to the distal of ICA and ECA. Conclusion CFD combined with MR angiography can be utilized to visualize the cyclical change of flow patterns of carotid bifurcation with different phases of a cardiac cycle.