基于CT影像的颈动脉分叉血流动力学特性分析

利用实际病人的CT影像数据构建颈动脉分叉血管几何模型，利用ANSYS有限元软件计算血流速度和压力分布，对颈动脉血流动力学的特征进行分析，如颈动脉剪切应力在一个心动周期里不同时刻的变化情况，颈动脉窦部的血流速度场随时间变化情况，涡流形成的特点；然后分析颈总动脉、颈内动脉和颈外动脉的血流阻力变化情况.数值仿真结果表明，在心动周期的不同时刻，颈动脉窦部的剪切力几乎是最小的.在颈动脉窦部下方附近，涡流易于形成.在收缩期的开始阶段，动脉阻力有一个很大的高峰.这些特点会对研究颈动脉血管疾病有一定的启发.

Hemodynamic Characteristics Analysis of Carotid Artery Bifurcation Based on CT Images

The geometric model of a carotid artery bifurcation was constructed from the CT images of a real patient. Using this model， the velocity and pressure distribution of the carotid arteries were simulated by a finite element software ANSYS. Further analysis was done on the hemodynamic characteristics of the carotid artery bifurcation， such as the wall shear stress distribution at different time points， the blood velocity field at different time points， and the characteristics of turbulence. Finally the blood resistance of carotid arteries was analyzed. The results turned out that the wall shear stress is almost the lowest at the sinus， the turbulence occurs nearby the sinus. There is a high pulse for blood resistance at the beginning of systole period. These findings could be useful for relevant research of cardiovascular diseases.