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Diffuse Reflectance Light on Surface of Biological Material

The absorption and transport scattering coefficients of biological material determine the radial dependence of the diffuse reflectance light that is due to a point source. In order to noninvasive determinate the optical scattering and absorption coefficients of biological material, we must know the radial dependence of the diffuse reflectance. The diffusion approximation of the radiative transfer equation is a model used widely to describe photon migration in biological material. An analysis of the steady state diffusion equation together with its solution of the diffuse reflectance light for the slab geometry and for a semi-infinite diffusing biological material is reported. The result has been compared with that obtained from Monte Carlo simulations. The comparison has shown that the solution about the diffuse reflectance light on surface of biological material is the same as that obtained from Monte Carlo simulations.