空间分辨漫反射的一阶散射参量灵敏度

以输运理论的P3近似为基础,推导了空间分辨漫反射的一阶散射参量灵敏度的解析表示,并进行了数值分析,比较了散射参量对P3近似和漫射近似漫反射的影响.结果表明:在距光源两个输运平均自由程以内,该灵敏度与相应于漫射近似的灵敏度差别较为明显;距离光源约四个输运平均自由程附近,该灵敏度等于零,并且与光源之距与相应于漫射近似情况也...

Sensitivities of the Spatial-resolved Diffuse Reflectance First-order Scattering Parameter

The sensitivity expression of spatial-resolved diffuse reflectance to first-order scattering parameter is derived and numerical analyzed in the P3 approximation of transport theory, the influence of scattering parameter on the P3 approximation and diffusion approximation reflectance are also compared. The results show that: the sensitivity is distinct with that of the diffusion approximation in the region of about two transport mean free paths, and the optimum source–detector distance where the sensitivity to scattering parameter equals zero is found at some distance about four transport mean free paths, and differs from the diffusion approximation’s too. The optimum source–detector distance is found shortened when a medium has higher scattering coefficient, and this change is more obvious with lower absorption. The research is very valuable theoritically for obtaining absorption information of tissue with diffuse reflectance at the optimum source–detector distance.