Abstract
Recently, numerical models for photon propagation inside the living tissues have extensively been discussed based on the radiative transfer (RTE) and diffusion equations (DE). In this paper, we propose a hybrid model based on the RTE and DE for photon propagation in a turbid medium with an anisotropic source and refractive-index-mismatched boundaries. At first, we examine the validity of the diffusion approximation by comparing calculated fluence rates between the RTE and DE. The accuracy of the diffusion approximation is confirmed when the detector is placed far from the source and boundaries. These length scales are estimated at ∼10/μt from the source and ∼3/μt from the boundaries with the transport coefficient μt. By using the two length scales, we can construct a hybrid model successfully. Our hybrid model recovers photon propagation based on the RTE, and effectively reduces computation costs by approximately half.
Published Version
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