Fig. 2.

Absorption coefficient maps for four phantoms containing inclusions of ${\mu }_{\mathrm{a},\text{inclusion}}=0.058{\mathrm{cm}}^{-1}$ at (a) different initial depths and four phantoms containing inclusions of ${\mu }_{\mathrm{a},\text{inclusion}}=0.104{\mathrm{cm}}^{-1}$ (b) at partial compression (31%) and full compression (55%). Dotted circle represents the size of the inclusion (1.7 cm).