Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"Flow phantom"”.
-
Generating Gaseous Emboli Mimics in an ECMO Flow Phantom
… to compare the results to. We aim to construct a flow phantom that fills these gaps. We build upon prior work on this project by mixing a translucent fluid that mimics the acoustic and rheological properties of blood. We explore various bubble generation designs and produce gaseous emboli mimics …
-
Modeling the Arterial System to Improve Ultrasound Measurements of Hemodynamic Parameters
… control. The solution presented here is to use a flow phantom: a physical, hydraulic system that mimics arterial blood flow. The phantom provides pressure waveforms, which come directly from a catheterized tube, and volumetric flow waveforms, from an ultrasonic flow meter, that closely match the …
-
Channel characterisation and modelling for transcranial Doppler ultrasound.
… Secondly, a TCD ultrasound medical blood flow phantom is described. The phantom, designed to replicate blood flow in the middle cerebral arteries (MCA) for TCD ultrasound studies, is discussed in terms of material selection, physical construction and acoustic characteristics, including …
-
An electronically steered, wearable transcranial doppler ultrasound system
… ultrasound system to measure cerebral blood flow velocity (CBFV) at the middle cerebral artery (MCA). TCD sonography has been clinically indicated in a variety of neurovascular diagnostic applications. Acceptance of conventional TCD methods, however, has been primarily impeded by several …
-
Pseudo Random Arterial Modulation (PRAM): A Novel ASL Approach to Measure Flow and Blood Transit Times
… a non-invasive MRI based method to measure blood flow. It does not require any contrast agent but rather uses water protons in the body as the contrast. PRAM is based on a pseudo random sequence of inversions and non-inversions of the arterial blood using radio frequency (RF) pulses at a labeling …
-
A wearable Transcranial Doppler ultrasound phased array system
… embedded signal processing implementations under flow phantom and human subject testing yields high correlation with accepted velocimetry methods. Vessel search and tracking functionality are also verified experimentally. Circuit integration is explored to further reduce instrumentation dimensions …
-
In-Silico design and verification of an extracorporeal normothermic cardiac perfusion system for use during heart transplantation procedures
… achieving physiologically relevant pressure and flow waveforms necessary for sustained coronary perfusion. A cardiovascular hemodynamic simulation environment was established by adapting lumped parameter models and integrating computed tomography angiograms, facilitating both in-silico and …
-
In-Silico design and verification of an extracorporeal normothermic cardiac perfusion system for use during heart transplantation procedures
… achieving physiologically relevant pressure and flow waveforms necessary for sustained coronary perfusion. A cardiovascular hemodynamic simulation environment was established by adapting lumped parameter models and integrating computed tomography angiograms, facilitating both in-silico and …
-
Investigation of ultrasound-measured blood flow related parameters in radial and ulnar arteries
… in some important ailments where blood flow related parameters such as flow rate (FR), wall shear rate (WSR), arterial wall motion (AWM) and pressure, all of which can be measured using ultrasound techniques, are useful in diagnosis and patient management. However these measurements are …
-
Coherent flow power Doppler imaging
<p>Ultrasonic flow detection is a widely used technique to detect vessel, measure blood flow velocities, and monitor perfusion. Conventional techniques include color Doppler imaging and power Doppler (PD) imaging. These methods depend on either the measurement of phase change or the detection of …
-
Fluid Dynamic Assessments of Spiral Flow Induced by Vascular Grafts
… affect endothelial function. Single spiral flow is a normal feature in medium and large sized vessels and it is induced by the anatomical structure and physiological function of the cardiovascular system. Grafts designed to generate a single spiral flow in the distal anastomosis have been …