Fig. 4.

Representative (a) ARFI and single-push VisR and (b) double-push VisR one-dimensional axial displacement profiles measured in a homogeneous tissue mimicking phantom at the focal depth, 15 mm above and 5 mm below the focal depth. For each depth, ARFI peak displacement (PD) and recovery time (RT) measures (column a), single-push VisR D_1a and D_2a measures with associated τ_σ values (column a), and double-push VisR D₁, D₂, and D₃ measures with associated τ_σ values (column b) are shown. Although ARFI PD and RT and single-push VisR τ_σ values vary with depth, double-push VisR τ_σ values are more consistent.