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Appl. Sci. 2017, 7(8), 840;

Effect of Ultrafast Imaging on Shear Wave Visualization and Characterization: An Experimental and Computational Study in a Pediatric Ventricular Model

IBiTech-bioMMeda, Ghent University, 9000 Ghent, Belgium
Institut Langevin, Ecole Supérieure de Physique et de Chimie Industrielles, CNRS UMR 7587, INSERM U979, 75012 Paris, France
Circulation and Medical Imaging, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada
Author to whom correspondence should be addressed.
Received: 14 July 2017 / Revised: 3 August 2017 / Accepted: 12 August 2017 / Published: 16 August 2017
(This article belongs to the Special Issue Ultrafast Ultrasound Imaging)
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Plane wave imaging in Shear Wave Elastography (SWE) captures shear wave propagation in real-time at ultrafast frame rates. To assess the capability of this technique in accurately visualizing the underlying shear wave mechanics, this work presents a multiphysics modeling approach providing access to the true biomechanical wave propagation behind the virtual image. This methodology was applied to a pediatric ventricular model, a setting shown to induce complex shear wave propagation due to geometry. Phantom experiments are conducted in support of the simulations. The model revealed that plane wave imaging altered the visualization of the shear wave pattern in the time (broadened front and negatively biased velocity estimates) and frequency domain (shifted and/or decreased signal frequency content). Furthermore, coherent plane wave compounding (effective frame rate of 2.3 kHz) altered the visual appearance of shear wave dispersion in both the experiment and model. This mainly affected stiffness characterization based on group speed, whereas phase velocity analysis provided a more accurate and robust stiffness estimate independent of the use of the compounding technique. This paper thus presents a versatile and flexible simulation environment to identify potential pitfalls in accurately capturing shear wave propagation in dispersive settings. View Full-Text
Keywords: ultrafast imaging; shear wave elastography; multiphysics modeling ultrafast imaging; shear wave elastography; multiphysics modeling

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Caenen, A.; Pernot, M.; Kinn Ekroll, I.; Shcherbakova, D.; Mertens, L.; Swillens, A.; Segers, P. Effect of Ultrafast Imaging on Shear Wave Visualization and Characterization: An Experimental and Computational Study in a Pediatric Ventricular Model. Appl. Sci. 2017, 7, 840.

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