超声粒子图像测速技术及应用

Echo particle image velocimetry technique and its applications

心血管疾病的产生与动脉血流的流动状况密切相关。然而,目前普遍应用的超声多普勒成像技术不能精确测量复杂血流流场信息。本文提出了一种基于超声造影微泡的超声全流场粒子图像测速技术,能够获得多维流速速度信息,且不依赖于声束与速度向量之间的夹角。本文首先着重阐述了超声全流场粒子测速技术的基本原理以及系统组成,并对直管流和旋转流场流体动力学特性进行了实验测试研究,实验结果表明本技术能够测量全流场速度,并可作为表征复杂血流流场的有力手段。

Developments of many cardiovascular problems have been shown to have a close relationship with arterial flow conditions. However, current ultrasound/Doppler imaging techniques cannot resolve the complex nature of arterial blood flow. We have recently developed a novel contrast-based echo particle imaging technique （Echo PIV） without angel dependence for noninvasive measuring multi-component flow vectors. Here we introduce the Echo PIV principles, system characterization and utility examination for characterizing hemodynamics in laminar flow and rotating flow. Echo PIV measurement results show its capability to resolve the complex hemodynamics including proximal flow velocity vectors, and velocity mapping. The Echo PIV method provides an easy, direct and accurate means of quantitatively yet noninvasively characterizing the complex vascular hemodynamics.