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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Single calibration multiplane stereo-PIV: the effect of mitral valve orientation on three-dimensional flow in a left ventricle model
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Single calibration multiplane stereo-PIV: the effect of mitral valve orientation on three-dimensional flow in a left ventricle model

机译：单校准倍增立体PIV：二尖瓣方向对左心室模型三维流动的影响

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摘要

The characterization of flow patterns in the left ventricle may help the development and interpretation of flow-based parameters of cardiac function and (patho-)physiology. Yet, in vivo visualization of highly dynamic three-dimensional flow patterns in an opaque and moving chamber is a challenging task. This has been shown in several recent multidisciplinary studies where in vivo imaging methods are often complemented by in silico solutions, or by in vitro methods. Because of its distinctive features, particle image velocimetry (PIV) has been extensively used to investigate flow dynamics in the cardiovascular field. However, full volumetric PIV data in a dynamically changing geometry such as the left ventricle remain extremely scarce, which justifies the present study. An investigation of the left ventricle flow making use of a customized cardiovascular simulator is presented; a multiplane scanning-stereoscopic PIV setup is used, which allows for the measurement of independent planes across the measurement volume. Due to the accuracy in traversing the illumination and imaging systems, the present setup allows to reconstruct the flow in a 3D volume performing only one single calibration. The effects of the orientation of a prosthetic mitral valve in anatomical and anti-anatomical configurations have been investigated during the diastolic filling time. The measurement is performed in a phase-locked manner; the mean velocity components are presented together with the vorticity and turbulent kinetic energy maps. The reconstructed 3D flow structures downstream the bileaflet mitral valve are shown, which provides additional insight of the highly three-dimensional flow.
机译：左心室中的流动模式的表征可以有助于对心脏功能的基于流动参数的发展和解释（PATO-）生理学的发展和解释。然而，在不透明和移动室中的高动态三维流动模式的体内可视化是一个具有挑战性的任务。这已在最近的几个多学科研究中示出，其中在体内成像方法中通常由硅溶液中的或通过体外方法互补。由于其独特的特征，粒子图像VELOCIMETRY（PIV）已被广泛地用于研究心血管场中的流动动态。然而，在诸如左心室的动态变化的几何形状中的全容积PIV数据仍然非常稀缺，这证明了本研究。提出了利用定制心血管模拟器的左心室流的研究;使用乘法扫描立体镜PIV设置，其允许在测量体积上测量独立平面。由于遍历照明和成像系统的准确性，本设置允许重建仅执行一个单一校准的3D体积中的流量。在舒张填充时间期间研究了假体二尖瓣对假体二尖瓣瓣膜和抗解剖结构的影响。测量以锁相方式执行;平均速度分量与涡旋和湍流动能图一起呈现。示出了双叶片下游的重建的3D流动结构，其提供了对高度三维流动的额外识别。

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