Phase velocity reconstructions based on the (a) 2D-FT, and (b) GST-SFK methods, for shear wave motion measurements. The phase velocity maps have superimposed markers corresponding to the maximum peaks of the phase velocity. Results were computed for the experimental, in vivo human liver studies, for (a) Subject I, (b) Subject II, (c) Subject III, (d) Subject IV, (e) Subject V, and (f) Subject VI.