Fig. 3.

Comparison of the depth sensitivity functions s_AC (z, ρ, ω), s_PH (z, ρ, ω), and s_DC (z, ρ) obtained with the DE. The results pertain to a slab 100 mm thick, ρ =20 mm, ${\mu }_s^{\prime }=1{\text{mm}}^{-1}$, μ_a =0.005 mm⁻¹, ν = {100, 200, 400} MHz and refractive indexes of slab and external, 1.4 and 1, respectively.