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.