Direction-independent bulk shear wave speed in 3D

Natural shear waves in the neonatal brain potentially provide more information about mechanical properties of the brain in healthy and diseased state. Since these shear waves can be omnipresent, a direction-independent method to determine the propagation speeds of these shear waves is needed. In this study, we developed a direction-independent 3D wavenumber-frequency-domain technique to estimate the shear wave propagation speeds. Furthermore, a dominant propagation direction of the shear waves can potentially be determined with this technique. Measurements were performed in a homogeneous bulk phantom. The obtained results show a good agreement with the propagation speeds obtained with a Radon transform applied on 2D measurements and a clinical system with an elasticity mode.

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