Comparison of Diffusion and Transport in human head
نویسندگان
چکیده
Why: Due to the long processing time associated with Monte Carlo, it is advisable to adopt a faster alternative forward model with comparable accuracy. FD, implementing the diffusion equation, offers greater computational efficiency, but at the cost of modeling accuracy. The low scattering properties of the Cerebral Spinal Fluid (CSF) filling the space between the brain and the skull has been of particular concern in the development of an accurate photon migration forward problem for the human head as the diffusion equation is known to provide inaccurate solutions under such circumstances [1, 4]. The roughness of CSF is of particular interest as it limits the average straight-line distance that a photon would travel in the ”void” region. Thus, even if the ”void” region does not scatter light, we could treat it as if it had an effective scattering coefficient such that the typical scattering length is greater than the average straight-line distance through the ”void” region [1]. The diffusion equation may be perfectly accurate under such conditions.
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