Fig. 6.

Spatially resolved absorption sensitivity distributions are displayed on a ${\mathrm{Log}}_{10}$ scale for highly scattering media ${\mu }_s^{\prime }/{\mu }_a=100$ with ${\rho }_{\mathrm{sds}}={\ell }^{\star }$ for $\alpha =0\mathrm{deg}$ (a–c) and $\alpha =30\mathrm{deg}$ (d–f). Distributions are displayed for the $x\text{-}z$ plane at $y=0$ (a, d) and the $y\text{-}z$ plane at $x={\rho }_{\mathrm{sds}}/2$ (b, e), where the colormap provides the results obtained using fine angular discretization. The corresponding depth-dependent cumulative absorption sensitivity is plotted for the four angular discretization cases and the PHD (c, f).