Discrete-ordinate transport simulations of light propagation in highly forward scattering heterogeneous media

Andreas Hielscher, Raymond E. Alcouffe

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We implemented a delta-Eddington scheme in conjunction with a finite-difference, discrete-ordinate, radiative- transport code to accurately and efficiently simulate light propagation in highly-forward-scattering media. It is demonstrated that light propagation does only weakly depend on the anisotropy factor, g, as long as the reduced scattering coefficient, |US', is much larger than the absorption coefficient, jna. When |ia ~ ps', the fluence rate decays faster in media with high g-values compared to isotropically scattering (g = 0) media. In heterogeneous media that contain void-like spaces, such as the cerebrospinal-fluid-filled ventricles in the brain, the choice of g barely affects the predicted light propagation. However, the diffusion approximation does not yield an accurate description of the light transport in these cases.
    Original languageEnglish (US)
    Title of host publicationAdvances in Optical Imaging and Photon Migration, J. Fujimoto and M. Patterson, eds., Vol. 21 of OSA Trends in Optics and Photonics (Optica Publishing Group, 1998)
    StatePublished - 1998

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