Requirements for accurate estimation of anisotropic material parameters by magnetic resonance elastography: A computational study.

ABSTRACT:

Purpose

To establish the essential requirements for characterization of a transversely isotropic material by magnetic resonance elastography (MRE).

Theory and methods

Three methods for characterizing nearly incompressible, transversely isotropic (ITI) materials were used to analyze data from closed-form expressions for traveling waves, finite-element (FE) simulations of waves in homogeneous ITI material, and FE simulations of waves in heterogeneous material. Key properties are the complex shear modulus μ₂ , shear anisotropy ϕ=μ1/μ2-1, and tensile anisotropy ζ=E1/E2-1.

Results

Each method provided good estimates of ITI parameters when both slow and fast shear waves with multiple propagation directions were present. No method gave accurate estimates when the

SUBMITTER: Tweten DJ 

PROVIDER: S-EPMC5513802 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature