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Objective - Shear wave elastography has enriched ultrasound medical imagingwith quantitative measurements of tissue stiffness. However, this method stillsuffers from some limitations due to viscoelasticity, guiding geometry orstatic deformations.  Approach - To explore these limitations, a nearly-incompressible softelastomer strip is chosen to mimic the mechanical behavior of an elongatedtissue. A supersonic shear wave scanner measures the propagation of shear waveswithin the strip. By repeating the experiment on the same sample for differentorientations and static strains, the scanner estimates the shear wave velocityin a wide range from 2 to 6 m/s.  Main results - The effect of waveguiding is highlighted and thespatio-temporal Fourier transform of the raw data provides dispersion diagrams.We provide a theoretical model that accounts for the static deformation andallows the extraction of the mechanical parameters of the sample, including itsrheology and hyperelastic behavior.  Significance - To overcome some limitations of current elastography, wepropose a method that would allow the simultaneous characterization of theviscoelastic and hyperelastic properties of soft tissues, paving the way forrobust quantitative elastography of elongated tissues.

Supersonic shear wave imaging in stretched soft strips: modeling for quantitative elastography