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Journal Article Modeling of diffuse-diffuse photon coupling via a nonscattering region: a comparative study
Cited 19 time in scopus Share share facebook twitter linkedin kakaostory
Authors
Jae Hoon Lee, Seunghwan Kim, Youn Tae Kim
Issue Date
2004-06
Citation
Applied Optics, v.43, no.18, pp.3640-3655
ISSN
1559-128X
Publisher
Optical Society of America (OSA)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1364/AO.43.003640
Abstract
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 BIG 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.
KSP Keywords
Boundary coupling, Clear layer, Coupling method, Diffusion approximation, Finite Element(FE), Finite-element method(FEM), Four-layer, Head model, Light propagation, Monte Carlo (MC) Simulation, Pencil beam