Practical and adequate approach to modeling light propagation in an adult head with low-scattering regions by use of diffusion theory

Tatsuya Koyama, Atsushi Iwasaki, Yosuke Ogoshi, Eiji Okada

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A practical and adequate approach to modeling light propagation in an adult head with a low-scattering cerebrospinal fluid (CSF) region by use of diffusion theory was investigated. The diffusion approximation does not hold in a nonscattering or low-scattering regions. The hybrid radiosity - diffusion method was adopted to model the light propagation in the head with a nonscattering region. In the hybrid method the geometry of the nonscattering region is acquired as a priori information. In reality, low-level scattering occurs in the CSF region and may reduce the error caused by the diffusion approximation. The partial optical path length and the spatial sensitivity profile calculated by the finite-element method agree well with those calculated by the Monte Carlo method in the case in which the transport scattering coefficient of the CSF layer is greater than 0.3 mm-1. Because it is feasible to assume that the transport scattering coefficient of a CSF layer is 0.3 mm-1, it is practical to adopt diffusion theory to the modeling of light propagation in an adult head as an alternative to the hybrid method.

Original languageEnglish
Pages (from-to)2094-2103
Number of pages10
JournalApplied Optics
Volume44
Issue number11
DOIs
Publication statusPublished - 2005 Apr 10

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cerebrospinal fluid
Light propagation
diffusion theory
Cerebrospinal fluid
Scattering
propagation
scattering coefficients
scattering
optical paths
approximation
Monte Carlo method
finite element method
Monte Carlo methods
sensitivity
Finite element method
profiles
geometry
Geometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Practical and adequate approach to modeling light propagation in an adult head with low-scattering regions by use of diffusion theory. / Koyama, Tatsuya; Iwasaki, Atsushi; Ogoshi, Yosuke; Okada, Eiji.

In: Applied Optics, Vol. 44, No. 11, 10.04.2005, p. 2094-2103.

Research output: Contribution to journalArticle

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