Ralph Sinkus1, Sverre Holm2, Bojan Guzina3, Sven Peter Nsholm2, Philippe Garteiser1, Sabrina Doblas1, Bernard E. Van Beers1, Valrie Vilgrain1
1Dept. of Radiology, CRB3, Hpital Beaujon (U773), INSERM, Clichy, France; 2Dept. of Informatics, University of Oslo, Norway; 3Department of Civil Engineering, University of Minnesota, Minneapolis, United States
At present, the origin of the power-law behaviour of the tissues complex shear modulus in the frequency domain is not understood. Multiple-scattering theories do provide a physical explanation for this phenomenon but require that very-short-delay multiple reflections do occur. We demonstrate via in-vivo transient MR-Elastography for the first time that that very-short-delay multiple reflections are present in liver tissue and that they are absent in a silicon phantom. This sets the basis for further research investigating whether the predicted link between the spatial distribution of reflection coefficients and the observed dispersive behaviour of G* indeed holds.