The propagation of photons in media for which the diffusion approximation does not hold is investigated. To that end simulations are performed with a finite-difference discrete- ordinate transport code and compared to analytical diffusion calculations. Differences between these transport simulations and diffusion calculations point to features specific for non-diffusive photon migration in homogeneous and heterogeneous tissues.
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Hielscher et al. (1996) studied this question.
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