不同狭窄度斑块的血流动力参数检测方法研究

摘要

To investigate the hemodynamics parameter of stress phase angle (SPA) in different stenosis states, the high-frequency ultrasonic imaging system was employed to obtain ultrasound contrast images of stenotic plaques, and the value of SPA was calculated through echo particle image velocimetry and cross-correlation algorithms. The experimental results showed that when the stenosis was 30%, 50% and 70%, the mean SPA was-162.88°,-201.99° and-222.89°, respectively. The study may suggest that the bigger stenosis, the more negative the SPA and the more asynchronous between the wall shear stress and circumferential stress.%为研究不同狭窄度斑块的血液动力学参数——应力相位角，利用高频超声成像系统采集不同狭窄度斑块的超声造影图像，并通过超声粒子图像测速算法和互相关算法计算得到这一参数。结果显示，30%狭窄度斑块的平均应力相位角为－162.88°；50%狭窄度斑块的平均应力相位角为－201.99°；70%狭窄度斑块的平均应力相位角为－222.89°。该研究表明，斑块狭窄程度越大，应力相位角的数值越负，壁面剪切力和周向应力越不同步。