Figure 8.

Wave propagation visualized by MRE in cube samples with different directions of excitation relative to fiber orientation. Fibers are oriented approximately 45° from horizontal as in Figure 2(b,c). Top panels (a,b) show fast and slow wave propagation in turkey breast actuated at 800 Hz and bottom panels (c,d) show aligned fibrin actuated at 600 Hz. Left panels (a,c): Actuation in the m_f direction with a component along the fibers (as in Figure 2(b)) leads to downward-propagating, fast shear waves. Right panels (b,d): Actuation in the m_s direction, perpendicular to the fibers (as in Figure 2(c) leads to downward-propagating, slow shear waves.