Figure 5.

(a,b) Maps of optical density (OD) of inhomogeneous phantom, calculated as −ln(R), obtained at different spatial frequencies (f = 0 mm⁻¹, (a)) and (f = 0.18 mm⁻¹, (b)). The rapid decrease of the OD values at the higher spatial frequency, where an increase of inhomogeneity localization depth in panel (b) is observed. (c) Optical density, calculated along the y coordinate, corresponds to the change of the localization depth of the inhomogeneity normalized to the minimum and maximum values of the OD along the profile. (d) Correlation between the ratio of normalized optical depths at spatial frequencies of projected patterns f = 0.05 mm⁻¹ and f = 0.0 mm⁻¹ with the true localization depth of inhomogeneity.