Abstract
Probing diffuse light in the multiple scattering regime has become a very active field of research. The backscattering regime is of particular importance for biomedical imaging techniques using visible or near-infrared diffuse light. At sufficiently large length scales (larger than the transport mean free path l*) and at long times (larger than the collision time l*/c, where c is the energy velocity), the transport of intensity is well described in the diffusion approximation. The simplicity of the diffusion approximation makes it an important tool in the analysis of experimental data in practical situations. Nevertheless, it suffers from drawbacks which limit its validity. On the one hand, boundary conditions can only be introduced approximatively, using extrapolation distances and angle-averaged reflection factors when internal reflections cannot be neglected. On the other hand, the scalar diffusion approximation overestimates the contribution from the short paths the error becoming more and more severe as the anisotropy of scattering increases.
© 2007 IEEE
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