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目的:计算流体动力学(CFD)和粒子图像测速法(PIV)都可以测量流场速度分布,通过对这两种方法的对比研究,为临床评估血流速度分布提供参考。方法:制备3组狭窄程度不同的血管仿体,分别在PIV硬件平台采集超声图像计算PIV实验结果,同时将PIV实验过程中的实验条件作为CFD模拟方法的边界初始条件,进行数值模拟获取CFD模拟的结果。最后将这两种方法得到的实验结果进行对比研究。结果:在30%狭窄程度较低的斑块仿体中,CFD与PIV实验结果相符,而在50%和70%狭窄程度的斑块仿体中,CFD和PIV实验结果相差较大。结论:PIV和CFD都可以用于流场血流速度的计算,但是CFD更适用于低速度流场的计算。
OBJECTIVE: Both computational fluid dynamics (CFD) and particle image velocimetry (PIV) can measure the velocity distribution of the flow field. By comparing these two methods, it provides a reference for the clinical assessment of blood flow velocity distribution. Methods: Three groups of vascular fimbriae with different degree of stenosis were prepared. The PIV results were collected on the PIV hardware platform. The experimental conditions in the PIV experiment were taken as the initial boundary conditions for the CFD simulation. The CFD simulation the result of. Finally, the experimental results obtained by these two methods are compared. Results: The CFD was consistent with the PIV results in 30% of the plaques with lower stenosis. However, the results of the CFD and PIV were quite different in 50% and 70% of the plaques. Conclusion: Both PIV and CFD can be used to calculate the velocity of flow field, but CFD is more suitable for the calculation of velocity field.