Giacomo Annio1,2, Omar Darwish2, Elijah Van Houten3, Knut Solna4, Sverre Holm5, and Ralph Sinkus1,2
1LVTS, INSERM U1148, Paris, France, 2Department of Biomedical Engineering, King's College London, London, United Kingdom, 3Département de Génie Mécanique, Université de Sherbrooke, Sherbrooke, QC, Canada, 4Department of Mathematics, University of California at Irvine, Irvine, CA, United States, 5Department of Physics, University of Oslo, Oslo, Norway
1LVTS, INSERM U1148, Paris, France, 2Department of Biomedical Engineering, King's College London, London, United Kingdom, 3Département de Génie Mécanique, Université de Sherbrooke, Sherbrooke, QC, Canada, 4Department of Mathematics, University of California at Irvine, Irvine, CA, United States, 5Department of Physics, University of Oslo, Oslo, Norway
We explore the origin of viscosity as quantified via MRE and
show that its majority is originating from scattering and not from absorption
(conversion to heat), fundamentally changing its interpretation. We propose a
nonlocal viscoelastic model to describe the dispersion in scattering media.
Figure 2: Results of the MRE acquisition depicting the z-component of the curl of the displacement vector in the pure ultrasound gel and in the ultrasound gel with the embedded scattering structure.
Figure 5: Dispersion
curves (with a power law fittings) and the corresponding frequency evolution of the phase angle for the
pure ultrasound gel, ultrasound gel with embedded fractal structure, and a bovine tissue
specimen. Magnitude coronal sections of the three specimens are shown on the first column.
