Time-resolved photon migration through an adult head model: comparison between Finite Element and Monte Carlo calculations
2007
In this work, a Finite Element calculations based on diffusion approximation
are compared with Monte Carlo transport data code in time-resolved reflectance
simulations of light propagation in a three-layered head model, which can be seen as
a very simplistic approximation of the adult head. We also address the effects
caused by the cerebrospinal fluid (CSF), filling the space between the skull and the
brain, on the accuracy of the diffusion approximation for different values of CSF
reduced scattering coefficients µs′ varying
between 0.1 and 1 mm-1. Significant differences between transport and
diffusion calculations show that diffusion approximation fails to describe
accurately light propagation in voidlike region such as the cerebrospinal fluid
(CSF), in which absorption and scattering are very small compared to the surrounding
media, whereas the Monte Carlo predictions are not greatly affected. However, It is
shown that the diffusion equation should provide reasonable solutions with a CSF
reduced scattering coefficient µs′ = 0.3
mm-1. The results indicate that a multi-layered model including CSF
is more appropriate for the determination of the optical properties of the human
head and to obtain accurate solutions of the forward problem with diffusion
approximation.
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