Detection of blood flow in left ventricle by echocardiography using speckle image velocimetry

2014 ◽  
Author(s):  
Qi Zhang ◽  
Moli Zhou ◽  
Ming Qian ◽  
Yun Dong ◽  
Ming Chen
Keyword(s):  
Blood Flow ◽  
Left Ventricle ◽  
Speckle Image ◽  
Image Velocimetry

scholarly journals Quantitative blood flow estimation in vivo by optical speckle image velocimetry

Optica ◽  
2021 ◽  
Author(s):  
Euiheon Chung ◽  
Muhammad Mohsin Qureshi ◽  
Yan Liu ◽  
Khuong Duy Mac ◽  
Minsung Kim ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Estimation ◽  
Speckle Image ◽  
Image Velocimetry

scholarly journals Quantitative blood flow estimation in vivo by optical speckle image velocimetry

2021 ◽  
Author(s):  
Muhammad Mohsin Qureshi ◽  
Yan Liu ◽  
Khoung Duy Mac ◽  
Minsung Kim ◽  
Abdul Mohaimen Safi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Optical Methods ◽  
High Temporal Resolution ◽  
Wide Field ◽  
Image Size ◽  
Speckle Image ◽  
Vector Map ◽  
Flow Vector ◽  
Image Velocimetry

Speckle based methods are popular non-invasive, label-free full-field optical techniques for imaging blood flow maps at single vessel resolution with a high temporal resolution. However, conventional speckle approach cannot provide an absolute velocity map with magnitude and direction. Here, we report a novel optical speckle image velocimetry (OSIV) technique for measuring the quantitative blood flow vector map by utilizing particle image velocimetry with speckle cross-correlations. We demonstrate that our OSIV instrument has a linearity range up to 7 mm/s, higher than conventional optical methods. Our method can measure the absolute flow vector map at up to 190 Hz without sacrificing the image size, and it eliminates the need for a high-speed camera/detector. We applied OSIV to image the blood flow in a mouse brain, and as a proof of concept, imaged the real-time dynamic changes in the cortical blood flow field during the stroke process in vivo. Our wide-field quantitative flow measurement OSIV method without the need of tracers provides a valuable tool for studying the healthy and diseased brain.

Numerical simulation of pulsatile blood flow in the human left ventricle

2007 ◽  
Vol 55 (S 1) ◽  
Author(s):  
W Schiller ◽  
K Spiegel ◽  
T Schmid ◽  
H Rudorf ◽  
S Flacke ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Left Ventricle ◽  
Pulsatile Blood Flow ◽  
Human Left Ventricle

Experimental investigation of the influence of the hydraulic performance of an axial blood pump on intraventricular blood flow

2021 ◽  
pp. 039139882110130
Author(s):  
Guang-Mao Liu ◽  
Fu-Qing Jiang ◽  
Xiao-Han Yang ◽  
Run-Jie Wei ◽  
Sheng-Shou Hu
Keyword(s):  
Blood Flow ◽  
Particle Image ◽  
Swirling Flow ◽  
Blood Stasis ◽  
Systemic Circulation ◽  
Operating Conditions ◽  
Blood Pump ◽  
Image Velocimetry ◽  
Ct Data

Blood flow inside the left ventricle (LV) is a concern for blood pump use and contributes to ventricle suction and thromboembolic events. However, few studies have examined blood flow inside the LV after a blood pump was implanted. In this study, in vitro experiments were conducted to emulate the intraventricular blood flow, such as blood flow velocity, the distribution of streamlines, vorticity and the standard deviation of velocity inside the LV during axial blood pump support. A silicone LV reconstructed from computerized tomography (CT) data of a heart failure patient was incorporated into a mock circulatory loop (MCL) to simulate human systemic circulation. Then, the blood flow inside the ventricle was examined by particle image velocimetry (PIV) equipment. The results showed that the operating conditions of the axial blood pump influenced flow patterns within the LV and areas of potential blood stasis, and the intraventricular swirling flow was altered with blood pump support. The presence of vorticity in the LV from the thoracic aorta to the heart apex can provide thorough washing of the LV cavity. The gradually extending stasis region in the central LV with increasing blood pump support is necessary to reduce the thrombosis potential in the LV.

scholarly journals Оценка изменений гемодинамики при вентрикуло-коронарной перфузии

2007 ◽  
Vol 6 (1) ◽  
pp. 94-96
Author(s):  
V. Ye. Tolpekin ◽  
D. V. Shumakov ◽  
E. K. Gasanov ◽  
R. Sh. Saitgareyev ◽  
A. V. Mukha ◽  
...  
Keyword(s):  
Blood Flow ◽  
Left Ventricle ◽  
Myocardial Blood Flow ◽  
Coronary Arteries ◽  
Myocardial Revascularization ◽  
Research Results

One of the most popular methods of myocardial revascularization is the surgery of coronary arteries. Our research results revealed that adequate myocardial blood flow is provided by hemo-perfusion from the left ventricle to coronary arter-ies.

Measurements of Mean Velocity and Turbulent Statistics in a Centrifugal Blood Pump

2002 ◽  
Author(s):  
Steven W. Day ◽  
James C. McDaniel ◽  
Phillip P. Lemire ◽  
Houston G. Wood
Keyword(s):  
Blood Flow ◽  
Left Ventricle ◽  
Heart Transplantation ◽  
Mechanical Design ◽  
Left Ventricular ◽  
The Body ◽  
Western World ◽  
Mean Velocity ◽  
Centrifugal Blood Pump ◽  
Turbulent Statistics

An estimated 150,000 patients in the Western World require heart transplantation every year, while only 4,000 (2.5%) of them actually receive a donor heart [1]. This lack of available donors for heart transplantation has led to a large effort since the 1960s to develop an artificial mechanical heart as an alternative to heart transplant. Most end stage cardiac failures result from cardiac disease or tissue damage of the left ventricle. After this failure, the ventricle is not strong enough to deliver an adequate supply of oxygen to critical organs. A left ventricular assist device (LVAD) is a mechanical pump that does not replace the native heart, but rather works in concert with it. An LVAD can effectively relieve some strain from a native heart, which has been weakened by disease or damage, and increase blood flow supplied to the body to maintain normal physiologic function. The inlet to the LVAD is attached to the native left ventricle, and the output of the assist pump rejoins the output of the native heart at the aorta, as shown in Figure 1. Blood flow from both the aortic valve and the assist pump combine and flow through the body. The clinical effectiveness of LVADs has been demonstrated; however, all of the currently available pumps have a limited life because of either the damage that they cause to blood or their limited mechanical design life.

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