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Image reconstruction results using true background optical properties obtained using (a) a semi-infinite model for the two-layer structure and (b) a two-layer model for the layered structure. In each figure, the first slice is the spatial x-y image at a 0.5-cm depth from the surface and the last slice is at a 3.0-cm depth. The dimension of each slice is 8×8 cm and the spacing between the slices is 0.5 cm. The vertical scale is absorption coefficient in inverse centimeters.
