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In order to evaluate the heart function, it is valuable to detect and visualize the blood flow inside the left ventricle (LV) of the heart. In this paper, a method for flow detection in LV is proposed based on the echocardiography by using the speckle image velocimetry (SIV). It first segments the LV from the echocardiography and then conducts the SIV in the LV and estimates displacement vectors of...
This study aims to experimentally investigate the impact of vessel stiffness on the flow dynamics of pulsatile vascular flow. Vessel phantoms with elastic walls were fabricated using polyvinyl alcohol cryogel to result in stiffness ranging from 60.9 to 310.3 kPa and tested with pulsatile flows using a flow circulation set-up. Two-dimensional instantaneous and time-dependent flow velocity and shear...
Purpose: Hemodynamic changes in vascular stenosis could affect blood flow component of flow distribution which changed the nature of vascular smooth muscle cells. Observation and analysis of blood flow in the heart disease have important clinical significance of treatments of arterial stenosis. Method: The ultrasonic particle image velocimetry (Echo PIV) technique is appropriate for measuring blood...
We have recently developed a novel contrast-based micro echo particle imaging technique (Micro-EPIV) for non-invasively measuring multi-component flow vectors and flow-induced shear stress in microscale tube flow or in vivo small blood flows. In this study, the measuring principle and system characterization are first introduced. Then, the Micro-EPIV technique is applied to examine flows in several...
This paper presents a high-resolution microscale ultrasonic particle image velocimetry technique (termed as Micro-EPIV) for measuring multi-component velocity vectors in microscale opaque flows such as blood and biofluid flow in microvessel. The method was tested by in vitro flow imaging and in vivo small animal blood flow imaging studies. The bioflow and blood flow were seeded with ultrasound contrast...
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