scholarly journals Application of a forward model of axisymmetric shear wave propagation in viscoelastic media to shear wave elastography

2018 ◽  
Vol 143 (6) ◽  
pp. 3266-3277 ◽  
Author(s):  
Sanjay S. Yengul ◽  
Paul E. Barbone ◽  
Bruno Madore
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Shear Wave Elastography ◽  
Forward Model ◽  
Viscoelastic Media ◽  
Axisymmetric Shear

scholarly journals Shear wave propagation in viscoelastic media: validation of an approximate forward model

2019 ◽  
Vol 64 (2) ◽  
pp. 025008 ◽  
Author(s):  
Fernando Zvietcovich ◽  
Natalie Baddour ◽  
Jannick P Rolland ◽  
Kevin J Parker
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Forward Model ◽  
Viscoelastic Media

scholarly journals Fundamental modeling of wave propagation in temporally relaxing media with applications to cardiac shear wave elastography

2020 ◽  
Vol 147 (5) ◽  
pp. 3091-3099
Author(s):  
A. Sabbadini ◽  
L. B. H. Keijzer ◽  
H. J. Vos ◽  
N. de Jong ◽  
M. D. Verweij
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Shear Wave Elastography

Approximate analytical models for cylindrical shear wave propagation in viscoelastic media

2013 ◽  
Vol 134 (5) ◽  
pp. 4011-4011
Author(s):  
Yiqun Yang ◽  
Matthew W. Urban ◽  
Bob Qiang ◽  
Robert J. McGough
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Analytical Models ◽  
Viscoelastic Media

scholarly journals Viscoelasticity Imaging of Biological Tissues and Single Cells Using Shear Wave Propagation

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongliang Li ◽  
Guillaume Flé ◽  
Manish Bhatt ◽  
Zhen Qu ◽  
Sajad Ghazavi ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Soft Tissues ◽  
Acoustic Radiation ◽  
Single Cells ◽  
Shear Waves ◽  
Mechanical Vibration ◽  
Shear Wave Elastography ◽  
Biomechanical Properties ◽  
Biological Tissues

Changes in biomechanical properties of biological soft tissues are often associated with physiological dysfunctions. Since biological soft tissues are hydrated, viscoelasticity is likely suitable to represent its solid-like behavior using elasticity and fluid-like behavior using viscosity. Shear wave elastography is a non-invasive imaging technology invented for clinical applications that has shown promise to characterize various tissue viscoelasticity. It is based on measuring and analyzing velocities and attenuations of propagated shear waves. In this review, principles and technical developments of shear wave elastography for viscoelasticity characterization from organ to cellular levels are presented, and different imaging modalities used to track shear wave propagation are described. At a macroscopic scale, techniques for inducing shear waves using an external mechanical vibration, an acoustic radiation pressure or a Lorentz force are reviewed along with imaging approaches proposed to track shear wave propagation, namely ultrasound, magnetic resonance, optical, and photoacoustic means. Then, approaches for theoretical modeling and tracking of shear waves are detailed. Following it, some examples of applications to characterize the viscoelasticity of various organs are given. At a microscopic scale, a novel cellular shear wave elastography method using an external vibration and optical microscopy is illustrated. Finally, current limitations and future directions in shear wave elastography are presented.

scholarly journals Experimental Evidence of Generation and Reception by a Transluminal Axisymmetric Shear Wave Elastography Prototype

Diagnostics ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 645
Author(s):  
Antonio Gomez ◽  
Manuel Hurtado ◽  
Antonio Callejas ◽  
Jorge Torres ◽  
Nader Saffari ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Shear Wave ◽  
Shear Wave Elastography ◽  
Sensing Element ◽  
New Approach ◽  
Shear Wave Speed ◽  
Ultrafast Imaging ◽  
Axisymmetric Shear ◽  
Rotational Actuator ◽  
Good Agreement

Experimental evidence on testing a non-ultrasonic-based probe for a new approach in transluminal elastography was presented. The proposed modality generated shear waves by inducing oscillatory rotation on the lumen wall. Detection of the propagated waves was achieved at a set of receivers in mechanical contact with the lumen wall. The excitation element of the probe was an electromagnetic rotational actuator whilst the sensing element was comprised by a uniform anglewise arrangement of four piezoelectric receivers. The prototype was tested in two soft-tissue-mimicking phantoms that contained lumenlike conduits and stiffer inclusions. The shear wave speed of the different components of the phantoms was characterized using shear wave elastography. These values were used to estimate the time-of-flight of the expected reflections. Ultrafast ultrasound imaging, based on Loupas’ algorithm, was used to estimate the displacement field in transversal planes to the lumenlike conduit and to compare against the readouts from the transluminal transmission–reception tests. Experimental observations between ultrafast imaging and the transluminal probe were in good agreement, and reflections due to the stiffer inclusions were detected by the transluminal probe. The obtained experimental evidence provided proof-of-concept for the transluminal elastography probe and encouraged further exploration of clinical applications.

scholarly journals Reverberant Shear Wave Elastography: A Multi-Modal and Multi-Scale Approach to Measure the Viscoelasticity Properties of Soft Tissues

2021 ◽  
Vol 8 ◽  
Author(s):  
Juvenal Ormachea ◽  
Fernando Zvietcovich
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Acoustic Waves ◽  
Guided Waves ◽  
Soft Tissues ◽  
Ex Vivo ◽  
Surface Acoustic Waves ◽  
Shear Wave Elastography ◽  
Biomechanical Properties

There are a variety of approaches used to create elastography images. Techniques based on shear wave propagation have received significant attention. However, there remain some limitations and problems due to shear wave reflections, limited penetration in highly viscous media, requirements for prior knowledge of wave propagation direction, and complicated propagation in layers where surface acoustic waves and guided waves are dominant. To overcome these issues, reverberant shear wave elastography (RSWE) was proposed as an alternative method which applies the concept of a narrow-band diffuse field of shear waves within the tissue. Since 2017, the RSWE approach has been implemented in ultrasound (US) and optical coherence tomography (OCT). Specifically, this approach has been implemented in these imaging modalities because they are similar in image formation principles and both share several approaches to estimate the biomechanical properties in tissues. Moreover, they cover different spatial-scale and penetration depth characteristics. RSWE has shown promising results in the elastic and viscoelastic characterization of multiple tissues including liver, cornea, and breast. This review summarizes the 4-year progress of the RSWE method in US and OCT. Theoretical derivations, numerical simulations, and applications in ex vivo and in vivo tissues are shown. Finally, we emphasize the current challenges of RSWE in terms of excitation methods and estimation of biomechanical parameters for tissue-specific cases and discuss future pathways for the in vivo and in situ clinical implementations.

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