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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 1 — Jan. 4, 2010

Simple and accurate expressions for diffuse reflectance of semi-infinite and two-layer absorbing and scattering media

Dmitry Yudovsky and Laurent Pilon  »View Author Affiliations


Applied Optics, Vol. 48, Issue 35, pp. 6670-6683 (2009)
http://dx.doi.org/10.1364/AO.48.006670


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Abstract

We present computationally efficient and accurate semiempirical models of light transfer suitable for real-time diffuse reflectance spectroscopy. The models predict the diffuse reflectance of both (i) semi- infinite homogeneous and (ii) two-layer media exposed to normal and collimated light. The two-layer medium consisted of a plane-parallel slab of finite thickness over a semi-infinite layer with identical index of refraction but different absorption and scattering properties. The model accounted for absorption and anisotropic scattering, as well as for internal reflection at the medium/air interface. All media were assumed to be nonemitting, strongly forward scattering, with indices of refraction between 1.00 and 1.44 and transport single-scattering albedos between 0.50 and 0.99. First, simple analytical expressions for the diffuse reflectance of the semi-infinite and two-layer media considered were derived using the two-flux approximation. Then, parameters appearing in the analytical expression previously derived were instead fitted to match results from more accurate Monte Carlo simulations. A single semiempirical parameter was sufficient to relate the diffuse reflectance to the radiative properties and thickness of the semi- infinite and two-layer media. The present model can be used for a wide range of applications including noninvasive diagnosis of biological tissue.

© 2009 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(160.1190) Materials : Anisotropic optical materials
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(230.4170) Optical devices : Multilayers
(010.5620) Atmospheric and oceanic optics : Radiative transfer

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: August 4, 2009
Revised Manuscript: October 21, 2009
Manuscript Accepted: October 26, 2009
Published: December 1, 2009

Virtual Issues
Vol. 5, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Dmitry Yudovsky and Laurent Pilon, "Simple and accurate expressions for diffuse reflectance of semi-infinite and two-layer absorbing and scattering media," Appl. Opt. 48, 6670-6683 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-48-35-6670

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