Figure 1.

Approach for creating analytical slow and fast shear wave data sets in three propagation directions. (a) The analytical data sets were created in a 70×70×70 mm³ cube of ITI material with a voxel size of 1 mm³; a fiber direction of $\mathit{a}=[1/\sqrt{2},0,-1/\sqrt{2}]$; and material properties of μ = 1000 Pa, ϕ = 1, ζ = 2, and η = 0.2. The displacements of the slow and fast shear waves relative to their polarizations are shown in (b) and (c), respectively. The polarizations of the slow m_s and fast m_f shear waves are shown with respect to the propagation directions in (d) n₁ = [− sin 15°,0, − cos 15°], (e) n₂ = [sin 1°,0, − cos 1°], and (f) n₃ = [sin 15°,0, − cos 15°]. Relative displacements of the slow and fast shear waves are compared for the propagation directions (g) n₁, (h) n₂, and (i) n₃. Slow shear wave displacements are displayed in the white planes in (d), (e), and (f), and the fast shear wave displacements are shown in the planes which include the fiber directions (black stripes).