Modified Monte Carlo method as applied to photon migration in biological tissues

A modification of the Monte Carlo simulation of light propagation in turbid isotropically scattering media is proposed. The modification consists in that, besides simulating free paths, multi-scattering photon migrations are statistically modeled by using the exact values of the transition densities obtained for infinite media. An estimate of the efficiency of the method is given. The method is shown to essentially reduce the computing time when modeling the photon propagation far from the boundaries. The angle distribution for the photon after multi-scattering migration is derived. The advantages and drawbacks of the method suggested are discussed.