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Proceedings Paper

Hybrid Monte Carlo-diffusion method for light propagation in tissue with low-scattering layer
Author(s): Toshiyuki Hayashi; Yoshihiko Kashio; Eiji Okada
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Paper Abstract

Near infrared spectroscopy is increasingly being used for monitoring cerebral oxygenation and haemodynamics. Since the light in the head is strongly scattered, it is necessary to modelling the light propagation in the head to obtain the volume of tissue sampled and partial optical path length in the brain. The serious problem to calculate the light propagation in the head is the heterogeneity of tissue especially the presence of low scattering CSF layer. Since the diffusion equation no longer holds in the low scattering layer, the light propagation in the head model with low scattering layer should be analysed by Monte Carlo method or light transport equation. In this study, we propose a new approach Hybrid Monte Carlo-Diffusion Method to calculate the light propagation in the adult head model with a low scattering CSF layer. The light propagation in a high scattering medium is calculated by the diffusion theory and that in a low scattering CSF layer is predicted by Monte Carlo method. The results of detected intensity and mean time of flight in a simplified adult head model by the Hybrid Monte Carlo-Diffusion method agree well with those predicted by Monte Carlo method.

Paper Details

Date Published: 2 November 2001
PDF: 7 pages
Proc. SPIE 4431, Photon Migration, Optical Coherence Tomography, and Microscopy, (2 November 2001); doi: 10.1117/12.447417
Show Author Affiliations
Toshiyuki Hayashi, Keio Univ. (Japan)
Yoshihiko Kashio, Keio Univ. (Japan)
Eiji Okada, Keio Univ. (Japan)


Published in SPIE Proceedings Vol. 4431:
Photon Migration, Optical Coherence Tomography, and Microscopy
Stefan Andersson-Engels; Michael F. Kaschke, Editor(s)

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