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Applied Optics

Applied Optics


  • Vol. 43, Iss. 18 — Jun. 20, 2004
  • pp: 3640–3655

Modeling of diffuse-diffuse photon coupling via a nonscattering region: a comparative study

Jae Hoon Lee, Seunghwan Kim, and Youn Tae Kim  »View Author Affiliations

Applied Optics, Vol. 43, Issue 18, pp. 3640-3655 (2004)

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It is well established that diffusion approximation is valid for light propagation in highly scattering media, but it breaks down in nonscattering regions. The previous methods that manipulate nonscattering regions are essentially boundary-to-boundary coupling (BBC) methods through a nonscattering void region based on the radiosity theory. We present a boundary-to-interior coupling (BIC) method. BIC is based on the fact that the collimated pencil beam incident on the medium can be replaced by an isotropic point source positioned at one reduced scattering length inside the medium from an illuminated point. A similar replacement is possible for the nondiffuse lights that enter the diffuse medium through the void, and it is formulated as the BIC method. We implemented both coupling methods using the finite element method (FEM) and tested for the circle with a void gap and for a four-layer adult head model. For mean time of flight, the BIC shows better agreement with Monte Carlo (MC) simulation results than BBC. For intensity, BIC shows a comparable match with MC data compared with that of BBC. The effect of absorption of the clear layer in the adult head model was investigated. Both mean time and intensity decrease as absorption of the clear layer increases.

© 2004 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.7050) Medical optics and biotechnology : Turbid media
(290.1990) Scattering : Diffusion

Original Manuscript: October 30, 2003
Revised Manuscript: March 29, 2004
Published: June 20, 2004

Jae Hoon Lee, Seunghwan Kim, and Youn Tae Kim, "Modeling of diffuse-diffuse photon coupling via a nonscattering region: a comparative study," Appl. Opt. 43, 3640-3655 (2004)

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