Various modifications of the diffusion model designed to describe photon migration in scattering and absorbing media are analyzed and compared in the nondiffusion region. A more accurate modified diffusion equation that has a broader region of applicability is introduced. The radiative-transfer equation is solved numerically to assess the validity range of different models tested and to select the best one.
© 1997 Optical Society of America
A. Ya. Polishchuk, S. Gutman, M. Lax, and R. R. Alfano, "Photon-density modes beyond the diffusion approximation: scalar wave-diffusion equation," J. Opt. Soc. Am. A 14, 230-234 (1997)