Fig. 2.

Logarithmic scale display of absorption distributions inside the medium computed using an absorption boundary (a) and a reflection boundary (b). The medium has dimensions of 12×12×7 cm³. The figure was displayed as x-z projection; x axis is the lateral dimension and z is the depth. The medium background optical properties were μ_a = 0.03⁻¹ and ${\mu }_s^{\prime }=6.0{\text{cm}}^{-1}$; the target optical properties were μ_a =0.3 cm⁻¹ and ${\mu }_s^{\prime }=6.0{\text{cm}}^{-1}$. The target was a 0.5-cm radius sphere located at (0, 0, 0.7 cm), and the source was located at (−1.7 cm, 0, 0).