中文摘要：

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。

英文摘要：

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.