Shear Wave Speed Estimation Using Reverberant Shear Wave Fields: Implementation and Feasibility Studies

Ultrasound in Medicine & Biology
Juvenal OrmacheaKevin J Parker

Abstract

Elastography is a modality that estimates tissue stiffness and, thus, provides useful information for clinical diagnosis. Attention has focused on the measurement of shear wave propagation; however, many methods assume shear wave propagation is unidirectional and aligned with the lateral imaging direction. Any deviations from the assumed propagation result in biased estimates of shear wave speed. To address these challenges, directional filters have been applied to isolate shear waves with different propagation directions. Recently, a new method was proposed for tissue stiffness estimation involving creation of a reverberant shear wave field propagating in all directions within the medium. These reverberant conditions lead to simple solutions, facile implementation and rapid viscoelasticity estimation of local tissue. In this work, this new approach based on reverberant shear waves was evaluated and compared with another well-known elastography technique using two calibrated elastic and viscoelastic phantoms. Additionally, the clinical feasibility of this technique was analyzed by assessing shear wave speed in human liver and breast tissues, in vivo. The results indicate that it is possible to estimate the viscoelastic properti...Continue Reading

Citations

Apr 28, 2018·Physics in Medicine and Biology·K J ParkerZ Hah
Sep 6, 2018·Ultrasonic Imaging·Kevin J ParkerZaegyoo Hah
Jun 7, 2019·Physics in Medicine and Biology·Juvenal OrmacheaRichard G Barr
Oct 24, 2020·Journal of Diabetes Science and Technology·Roozbeh NaemiBenjamin Castaneda Aphan
Aug 7, 2021·Physics in Medicine and Biology·J Ormachea, K J Parker
Aug 29, 2021·Journal of Medical Ultrasonics·Naotaka NittaTsuyoshi Shiina
Feb 21, 2019··Kevin J. ParkerJannick P. Rolland

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