Fig. 13.

(a) Coregistered US image and CG reconstructed (b) absorption and (c) reduced scattering coefficient maps of a target with ${\mu }_a=0.18{\mathrm{cm}}^{-1}$ and ${\mu }_s^{\prime }=11.0{\mathrm{cm}}^{-1}$ located at the 1.0 cm depth of the first layer. The fitted first layer properties estimated from the smaller probe were ${\mu }_a=0.029{\mathrm{cm}}^{-1}$ and ${\mu }_s^{\prime }=3.87{\mathrm{cm}}^{-1}$. The first layer thickness was 1.5 cm with optical properties of ${\mu }_a=0.02{\mathrm{cm}}^{-1}$ and ${\mu }_s^{\prime }=4.0{\mathrm{cm}}^{-1}$, and the second layer properties were ${\mu }_a=0.2{\mathrm{cm}}^{-1}$ and ${\mu }_s^{\prime }=8.0{\mathrm{cm}}^{-1}$.