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International Journal of Photoenergy
Volume 2014, Article ID 241364, 8 pages
http://dx.doi.org/10.1155/2014/241364
Research Article

Reflectance of Biological Turbid Tissues under Wide Area Illumination: Single Backward Scattering Approach

Department of Physics, Ryerson University, Toronto, ON, Canada M5B 2K3

Received 19 December 2013; Accepted 3 February 2014; Published 10 March 2014

Academic Editor: Victor Loschenov

Copyright © 2014 Guennadi Saiko and Alexandre Douplik. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Various scenarios of light propagation paths in turbid media (single backward scattering, multiple backward scattering, banana shape) are discussed and their contributions to reflectance spectra are estimated. It has been found that a single backward or multiple forward scattering quasi-1D paths can be the major contributors to reflected spectra in wide area illumination scenario. Such a single backward scattering (SBS) approximation allows developing of an analytical approach which can take into account refractive index mismatched boundary conditions and multilayer geometry and can be used for real-time spectral processing. The SBS approach can be potentially applied for the distances between the transport and reduced scattering domains. Its validation versus the Kubelka-Munk model, path integrals, and diffusion approximation of the radiation transport theory is discussed.