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Wave propagation in a cylindrically aligned fibrin gel (200 Hz actuation) specimen, illustrating analysis by directional filtering. (a) Elliptical waves exhibiting direction dependent propagation with different wave speeds in different directions. (b–c) Displacement field after directional filtering in each of two propagation directions specified by angle, θ, from the dominant fiber direction. (b) θ = 0° and (c) θ = 90°.
