Why the study?
Wall shear stress provides useful diagnostic information for vascular diseases, but accurate ultrasonic measurement requires correcting underestimation in vessels with complex geometries such as stenotic vessels.
Does fitting a Womersley flow model improve the accuracy of wall shear stress estimation compared to a linear model in ultrasonic measurements of stenotic vessels?
Does fitting a Womersley flow model improve the accuracy of wall shear stress estimation compared to a linear model in ultrasonic measurements of stenotic vessels?
Using a Womersley flow model rather than a linear model significantly reduces the error in estimating wall shear stress from ultrasound velocity profiles in stenotic vessels.
May improve ultrasound WSS accuracy via Womersley modeling; leaves open clinical validation before diagnostic use.
The wall shear stress (WSS) contains useful information for the diagnosis of vascular diseases. To improve the accuracy of WSS measurements by ultrasound, some studies have attempted to correct the underestimation of the WSS by approximating a blood flow velocity profile measured by ultrasound to a velocity distribution model such as laminar flow. In this study, a blood flow velocity profile measured by ultrasound was modeled by the Womersley flow model, in order to correct underestimation of WSS in cases of measurements of vessels with complex geometries such as stenotic vessels. The simulation results showed that the rms error of the estimated WSSs was 45.8% from the stenotic vessel with a stenotic ratio of 40% when the spatial gradient was estimated by fitting a linear model to the measured flow profile. Such an error was improved from 45.8% to 25.3% by fitting a Womersley flow model to the measured blood velocity profile.
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Mozumi et al. (2023) studied this question.
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