Elastography and time reversal of shear waves : application to the elasticity imaging of soft solids
type: Dataset
description: The interaction between wave and matter has long been studied in Physics. In particular, regarding medical applications, wave propagation through the human body resulted in several imaging modalities, each of which uses a specific type of wave linked to a given physical property. The elasticity of soft biological tissues is directly linked to its shear wave speed. Thus, in Elastography, shear waves are tracked for non-invasive assessment of the mechanical properties of soft tissues. In this context, this thesis proposes a study of different elastography techniques from a basic point of view, as well as from its potential applications. Firstly, in this manuscript, the use of 1D transient elastography for the quantitative elasticity assessment of thin layered soft tissues is proposed. Experiments on three phantoms with different elasticities and plate thicknesses were performed. Experimental shear wave speed estimations inside the plate were obtained and validated with finite difference simulation. In addition, the Supersonic Shear Imaging (SSI) technique was performed. For the SSI technique, the propagating wave inside the plate is guided as a Lamb wave. Experimental SSI dispersion curves were fitted using a generalized Lamb model to retrieve the plate bulk shear wave speed. Finally both techniques resulted in similar shear wave speed estimations. The main advantage of 1D transient elastography is that the bulk shear wave speed can be directly retrieved from a time of flight measurement without requiring a dispersion model. Secondly, throughout this thesis, two novel quantitative imaging modalities for extracting the soft tissue's elasticity from a complex reverberated diffuse elastic field are deepen: Time Reversal Elastography (TRE) and the passive inverse filter. The goal of both techniques is to locally estimate the tissue's elasticity, by measuring the focal spot size in a virtual time reversal experiment involving shear waves. By studying the Physics of a time …
identifier: NNT: 2012GRENY078
issued: 2026-05-09T11:19:45.166110
language: fr
modified: 2026-05-09T11:19:45.166114
contact point: Organization
  fn: CCSD
keyword: biological-tissues
keyword: elastographie
keyword: elastography
keyword: infoeu-reposemanticsdoctoralthesis
keyword: ondes-de-cisaillement
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: retournement-temporel
keyword: shear-waves
keyword: theses
keyword: time-reversal
keyword: tissues-biologiques
keyword: ultrasons
keyword: ultrasound
landing page: https://theses.hal.science/tel-00870362

Elastography and time reversal of shear waves : application to the elasticity imaging of soft solids
type: Distribution
format: HTML
issued: 2026-05-09T11:19:45.168951
modified: 2026-05-09T11:19:45.146729
access URL: https://theses.hal.science/tel-00870362

test_moissonnage_selune
type: Agent