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Characterizing dispersion in bovine liver using ARFI-based shear wave rheometry.

Sanjay S Yengul¹, Paul E Barbone¹, Bruno Madore²

¹Department of Mechanical Engineering, Boston University, Boston, MA, 02215, United States of America.

Biomedical Physics & Engineering Express

|August 5, 2024

Summary

Shear Wave Rheometry (SWR) accurately models shear properties in bovine liver across a wide frequency range, validating its core assumptions for tissue analysis.

Keywords:

ARFI dispersion liver rheometry shear modulus shear wave elastography viscoelasticity

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Area of Science:

Biomedical Engineering
Rheology
Medical Imaging

Background:

Dispersion in shear wave elastography (SWE) presents challenges and diagnostic opportunities.
Shear Wave Rheometry (SWR) processes acoustic radiation force impulse (ARFI) data to characterize soft media.
SWR assumes tissue homogeneity, isotropy, and axisymmetric excitation.

Purpose of the Study:

To assess the validity of SWR assumptions in ex vivo bovine liver.
To evaluate SWR's performance across a broad frequency spectrum.

Main Methods:

SWR was applied to measure shear properties of bovine liver.
Measurements were taken at various locations and probe orientations to test assumptions.
Quantities revealing assumption violations were specifically measured.

Main Results:

Shear properties were measured from 25-250 Hz.
Shear storage modulus increased fourfold (1-4 kPa), and loss modulus increased tenfold (0.2-3 kPa).
Measurements demonstrated high repeatability with low model error.

Conclusions:

The simplifying assumptions of SWR are valid for bovine liver.
SWR accurately models ARFI-induced shear waves as vector viscoelastic waves.
SWR is a versatile tool for characterizing soft tissue rheology.