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Light Transport in Tissue Flux, Reflection, and Transmission in Three Dimensions The flux at a point r is given by Equation (4.83) $$\mathbf{F}_d(\mathbf{r})=-{h'\over2}{\partial\varphi_d(\math... ...r_s)\pi F_0(\rho)\mu_0\exp(-\zeta/\mu_0) \right]\hat\mathbf{z}$$ Equations (4.142) and (4.143) provide representations for the partial derivatives of $\varphi _d(\mathbf {r})$ needed to calculate the flux. If $\pi F_0$ is the total power density incident on the slab then the diffuse reflectance and transmission are given by Equation (4.106) with the understanding that these are a function of radius.

S. A. Prahl."Light Transport in Tissue," PhD thesis, University of Texas at Austin, 1988.