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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 11 — Apr. 10, 2005
  • pp: 2094–2103

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, and Eiji Okada  »View Author Affiliations


Applied Optics, Vol. 44, Issue 11, pp. 2094-2103 (2005)
http://dx.doi.org/10.1364/AO.44.002094


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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.

© 2005 Optical Society of America

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.3890) Medical optics and biotechnology : Medical optics instrumentation

History
Original Manuscript: July 20, 2004
Revised Manuscript: November 17, 2004
Manuscript Accepted: November 17, 2004
Published: April 10, 2005

Citation
Tatsuya Koyama, Atsushi Iwasaki, Yosuke Ogoshi, and Eiji Okada, "Practical and adequate approach to modeling light propagation in an adult head with low-scattering regions by use of diffusion theory," Appl. Opt. 44, 2094-2103 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-11-2094

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