Reconstruction des propriétés viscoélastiques des tissus utilisant des mesures d'élastographie par résonance magnétique

Translated title of the contribution: Reconstruction of viscoelastic tissue properties from MR elastography-type measurements

Huina Yuan, Bojan B Guzina

Research output: Contribution to journalShort survey

2 Scopus citations

Abstract

This study is concerned with an optimization-based approach to the identification of "background" viscoelastic properties of soft tissues from magnetic resonance (MR) elastography-type measurements. In this approach, the triaxial tissue displacements, captured by the MR scanner over a suitable subdomain that is free of major heterogeneities, are split into (i) a boundary subset that is used to formulate the forward (Dirichlet) problem, and (ii) an internal subset, employed as "the data" for the inverse (material characterization) problem. For an elevated performance of the minimization scheme, material sensitivities of the featured cost functional are computed semi-analytically via a boundary-integral formulation, resulting in alternative "direct" and adjoint-field sensitivity formulas. The numerical results, obtained assuming input parameters that are relevant to MR elastography, indicate that the proposed approach may provide an effective means for comprehensive multi-frequency characterization of the "background" viscoelasticity of soft tissues.

Translated title of the contributionReconstruction of viscoelastic tissue properties from MR elastography-type measurements
Original languageFrench
Pages (from-to)480-488
Number of pages9
JournalComptes Rendus - Mecanique
Volume338
Issue number7-8
DOIs
StatePublished - Jul 1 2010

Keywords

  • Adjoint field
  • MR elastography
  • Material sensitivities
  • Optimization
  • Viscoelastic tissue characterization

Fingerprint Dive into the research topics of 'Reconstruction of viscoelastic tissue properties from MR elastography-type measurements'. Together they form a unique fingerprint.

  • Cite this