Monte Carlo prediction of light propagation in realistic adult head model

Kaori Tajima; Shuhei Eda; Eiji Okada

doi:10.1117/12.407607

22 November 2000 Monte Carlo prediction of light propagation in realistic adult head model

Kaori Tajima, Shuhei Eda, Eiji Okada

Proceedings Volume 4160, Photon Migration, Diffuse Spectroscopy, and Optical Coherence Tomography: Imaging and Functional Assessment; (2000) https://doi.org/10.1117/12.407607
Event: EOS/SPIE European Biomedical Optics Week, 2000, Amsterdam, Netherlands

Abstract

The light propagation in the head models has been investigated to deduce the volume of the brain tissue sampled by NIR instrument. The light propagation in the adult head is strongly affected by the presence of low scattering cerebrospinal fluid (CSF) layer. Although the brain surface is folded with sulci filled with the CSF, the brain surface in the previous head models has had simple geometry such as a flat or curved surface. In this study, the light propagation in a realistic adult and neonatal head models of which geometry is generated from MRI scan of the head is predicted by Monte Carlo method. The adult neonatal head models consist of small square elements to represent complex geometry and each element specified its scattering and absorption coefficients. The delta-scattering algorithm is implemented to keep the computation time within reasonable limit. The spatial sensitivity profiles for various source-detector spacing are predicted and the difference in the effect of the CSF on the spatial sensitivity profiles in the adult and neonatal head models is discussed. The low scattering CSF affects the light propagation in the adult head model while the distortion in spatial sensitivity profiles in the neonatal head models is not significant.

Citation Download Citation

Kaori Tajima, Shuhei Eda, and Eiji Okada "Monte Carlo prediction of light propagation in realistic adult head model", Proc. SPIE 4160, Photon Migration, Diffuse Spectroscopy, and Optical Coherence Tomography: Imaging and Functional Assessment, (22 November 2000); https://doi.org/10.1117/12.407607

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KEYWORDS

Head

Scattering

Light scattering

Brain

Monte Carlo methods

Absorption

Tissue optics

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