Chen B, Stamnes K, Stamnes J J
Appl Opt. 2001 Dec 1;40(34):6356-66. doi: 10.1364/ao.40.006356.
Accurate numerical simulations based on rigorous radiative transfer theory are used to assess the validity of the diffusion approximation that is frequently used in bio-optical imaging. These simulations show that the error is large for a non-index-matched boundary between air and tissue. This weakness of the diffusion approximation underscores the need to understand how diffusion theory can be used to extract accurate values of tissue optical properties. A validity criterion for the diffusion approximation is established on the basis of the single-scattering albedo a and the asymmetry factor g for a slab with index-matched boundaries.
基于严格辐射传输理论的精确数值模拟被用于评估生物光学成像中常用的扩散近似的有效性。这些模拟表明，对于空气与组织之间非折射率匹配的边界，误差很大。扩散近似的这一弱点凸显了理解如何利用扩散理论来提取组织光学特性准确值的必要性。基于具有折射率匹配边界的平板的单次散射反照率a和不对称因子g，建立了扩散近似的有效性准则。
