Boundary conditions for light propagation in diffusive media with nonscattering regions.
J OPT SOC AM A
1671 - 1681.
The diffusion approximation proves to be valid for light propagation in highly scattering media, but it breaks down in the presence of nonscattering regions. We present a compact expression of the boundary conditions for diffusive media with nonscattering regions, taking into account small-index mismatch. Results fi om an integral method based on the extinction theorem boundary condition are contrasted with both Monte Carlo and finite-element-method simulations, and a study of its limit of validity is presented. These procedures are illustrated by considering the case of the cerebro-spinal fluid in the brain, for which we demonstrate that for practical situations in light diffusion, these boundary conditions yield accurate results. (C) 2000 Optical Society of America [S0740-3232(00)00409-9] OCIS codes: 170.5270, 290.1990.
|Title:||Boundary conditions for light propagation in diffusive media with nonscattering regions|
|Keywords:||PHOTON-DENSITY WAVES, SCATTERING MEDIA, TURBID MEDIA, SIMULTANEOUS RECONSTRUCTION, OPTICAL-PROPERTIES, RADIATIVE-TRANSFER, TRANSPORT, TOMOGRAPHY, EQUATION, TISSUE|
|UCL classification:||UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
Archive Staff Only