Development of a custom-designed echo particle image velocimetry system for multi-component hemodynamic measurements: system characterization and initial experimental results
Development of a custom-designed echo particle image velocimetry system for multi-component hemodynamic measurements: system characterization and initial experimental results
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DOI：
10.1088/0031-9155/53/5/015
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发表时间：
2008-03-07
影响因子：
3.5
通讯作者：
Shandas, Robin
中科院分区：
文献类型：
--
作者：
Liu, Lingli;Zheng, Hairong;Shandas, Robin
我们最近开发了一种基于超声的速度测量技术，称为回声粒子图像速度测量(Echo PIV)，通过识别和跟踪动脉和不透明流体流动中的流动示踪剂(超声对比微泡)来测量动脉和不透明流体中的多分量速度矢量和局部剪切率。最初的系统是在从商用超声心动图扫描仪获得的图像上实现的。尽管前景看好，但该系统在空间分辨率和可测量的速度范围方面存在局限性。在这项工作中，我们提出了表征Echo PIV性能的标准规则，并报告了一个定制设计的Echo PIV系统，该系统具有更高的空间分辨率和可测量的速度范围。然后，我们使用该系统对管流、旋转流以及体外颈动脉和腹主动脉瘤(AAA)模型进行了初步测量，获得了这些流场中的局部速度和剪切率分布。实验结果验证了该技术的准确性，表明了定制的Echo PIV系统在非侵入性捕捉复杂流场方面的应用前景。
We have recently developed an ultrasound-based velocimetry technique, termed echo particle image velocimetry ( Echo PIV), to measure multi- component velocity vectors and local shear rates in arteries and opaque fluid flows by identifying and tracking flow tracers ( ultrasound contrast microbubbles) within these flow fields. The original system was implemented on images obtained from a commercial echocardiography scanner. Although promising, this system was limited in spatial resolution and measurable velocity range. In this work, we propose standard rules for characterizing Echo PIV performance and report on a custom-designed Echo PIV system with increased spatial resolution and measurable velocity range. Then we employed this system for initial measurements on tube flows, rotating flows and in vitro carotid artery and abdominal aortic aneurysm ( AAA) models to acquire the local velocity and shear rate distributions in these flow fields. The experimental results verified the accuracy of this technique and indicated the promise of the custom Echo PIV system in capturing complex flow fields non-invasively.