Nakai T, Nishimura G, Yamamoto K, Tamura M
Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan.
Phys Med Biol. 1997 Dec;42(12):2541-9. doi: 10.1088/0031-9155/42/12/017.
The optical diffusion coefficient in a homogeneous turbid medium with high absorption was determined by steady-state measurements of the light transmission under the infinite-boundary condition. The intensity of the transmission was well described by the solution of the optical diffusion equation. Moreover, the optical diffusion coefficient D was given by a constant, (3 mu'(s))-1, where mu'(s) is the reduced scattering coefficient, up to the absorption coefficient of about 0.3 mu'(s). These results mean that attenuation by absorption only contributes to exponential attenuation along the optical path defined by the scattering coefficient and geometry of the system even in high-absorption turbid media such as the pathological living tissues of bleeding or haematoma.
在具有高吸收的均匀浑浊介质中，光学扩散系数是通过在无限边界条件下对光透射率进行稳态测量来确定的。透射强度可以很好地用光学扩散方程的解来描述。此外，光学扩散系数D由常数(3μ'(s))-1给出，其中μ'(s)是约化散射系数，直到吸收系数约为0.3μ'(s)。这些结果意味着，即使在诸如出血或血肿的病理活体组织等高吸收浑浊介质中，吸收引起的衰减也仅导致沿由散射系数和系统几何形状定义的光路的指数衰减。
