Influence of fibrosis progression on the viscous properties of in vivo liver tissue elucidated by shear wave dispersion in multifrequency MR elastography

2021 ◽  
pp. 104645
Author(s):  
Rolf Reiter ◽  
Mehrgan Shahryari ◽  
Heiko Tzschätzsch ◽  
Matthias Haas ◽  
Christian Bayerl ◽  
...  
Keyword(s):  
Shear Wave ◽  
Liver Tissue ◽  
Wave Dispersion ◽  
Mr Elastography ◽  
Fibrosis Progression

Real-Time Monitoring of Shear Wave Traveling in Liver Tissue In Vivo

2004 ◽  
Vol 43 (5B) ◽  
pp. 3241-3244 ◽  
Author(s):  
Hideyuki Machida ◽  
Shin-ichi Yagi ◽  
Yuji Kondo ◽  
Yutaka Murata ◽  
Shin Akimoto
Keyword(s):  
Real Time ◽  
Shear Wave ◽  
Liver Tissue ◽  
Real Time Monitoring

Application of shear wave imaging and shear wave dispersion ultrasound vibrometry in assessing viscoelastic properties of human thyroid: In vivo pilot study

2013 ◽  
Vol 134 (5) ◽  
pp. 4009-4009 ◽  
Author(s):  
Mohammad Mehrmohammadi ◽  
Pengfei Song ◽  
Carolina A. Carrascal ◽  
Matthew W. Urban ◽  
Matthew R. Callstrom ◽  
...  
Keyword(s):  
Pilot Study ◽  
Shear Wave ◽  
Viscoelastic Properties ◽  
Wave Dispersion ◽  
Human Thyroid ◽  
Shear Wave Imaging ◽  
Wave Imaging

scholarly journals Fluids Alter Elasticity Measurements: Porous Wave Propagation Accounts for Shear Wave Dispersion in Elastography

2021 ◽  
Vol 9 ◽  
Author(s):  
Johannes Aichele ◽  
Stefan Catheline
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Shear Wave ◽  
Wave Dispersion ◽  
Elastic Wave Propagation ◽  
Elastic Model ◽  
Fluid Viscosity ◽  
Wave Speeds ◽  
Wide Range

In shear wave elastography, rotational wave speeds are converted to elasticity measures using elastodynamic theory. The method has a wide range of applications and is the gold standard for non-invasive liver fibrosis detection. However, the observed shear wave dispersion of in vivo human liver shows a mismatch with purely elastic and visco-elastic wave propagation theory. In a laboratory phantom experiment we demonstrate that porosity and fluid viscosity need to be considered to properly convert shear wave speeds to elasticity in soft porous materials. We extend this conclusion to the clinical application of liver stiffness characterization by revisiting in vivo studies of liver elastography. To that end we compare Biot’s theory of poro-visco-elastic wave propagation to Voigt’s visco-elastic model. Our results suggest that accounting for dispersion due to fluid viscosity could improve shear wave imaging in the liver and other highly vascularized organs.

Three-parameter shear wave inversion in MR elastography of incompressible transverse isotropic media: Application to in vivo lower leg muscles

2015 ◽  
Vol 75 (4) ◽  
pp. 1537-1545 ◽  
Author(s):  
Jing Guo ◽  
Sebastian Hirsch ◽  
Michael Scheel ◽  
Jürgen Braun ◽  
Ingolf Sack
Keyword(s):  
Shear Wave ◽  
Lower Leg ◽  
Mr Elastography ◽  
Leg Muscles ◽  
Wave Inversion ◽  
Isotropic Media ◽  
Transverse Isotropic

An initial study of complete 2D shear wave dispersion images using a reverberant shear wave field

2019 ◽  
Vol 64 (14) ◽  
pp. 145009 ◽  
Author(s):  
Juvenal Ormachea ◽  
Kevin J Parker ◽  
Richard G Barr
Keyword(s):  
Wave Field ◽  
Shear Wave ◽  
Wave Dispersion ◽  
Initial Study
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