Fig. 12.

(a) to (c) Reconstructed optical absorption maps at (a) 780 and (b) 830 nm and the computed total hemoglobin map (c) using the semi-infinite model. Reconstructed absorption coefficients were 0.232 cm^-1 (780 nm), 0.238 cm^-1 (830 nm), and 111.33 μmol/liter (total hemoglobin). (d) to (f) Reconstructed optical absorption maps at (d) 780 and (e) 830 nm and the computed total hemoglobin map (f) using the layer-based model. Reconstructed absorption coefficients were 0.247 cm^-1 (780 nm), 0.293 cm^-1 (830 nm), and 126.39 μmol/liter (total hemoglobin). In each figure, the first slice is the spatial x-y image of 0.2-cm depth from the skin surface and the last slice is 3.0 cm toward the chest wall. The dimensions of each slice are 9×9 cm and the spacing between the slices is 0.5 cm. The vertical scale is absorption coefficient in inverse centimeters or total hemoglobin in the unit of micromoles per liter.