光源附近组织的空间分辨漫反射研究  

Spatial-Resolved Diffuse Reflectance of Tissue Close to Source

作　　者：张小娟[1] 刘迎[1] 高宗慧[1] 

机构地区：[1]天津大学理学院物理系光电信息技术科学教育部重点实验室

出　　处：《中国激光》2005年第4期571-575,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60278004)资助项目。

摘　　要：P3 近似理论可以描述光源附近约1个输运平均自由程(MFP)内组织的漫反射光分布,这个区域的光分布与组织的散射相函数有关。利用P3 近似理论研究了组合相函数的结构因子α对光源附近组织的漫反射光分布的影响。研究表明:在输运平均自由程不变条件下,各向异性因子的变化不引起漫射近似适用区域光分布的改变,但对光源附近约1个输运平均自由程附近的光分布有很大影响;α对漫反射率的影响远大于相函数的高阶矩对漫反射率的影响。研究结果对于使用内窥方式或对表层组织进行活体检测的空间分辨漫反射测量技术具有实际意义。Diffuse reflectance of tissue close to source about 1 transp or t mean free path (MFP) can be analyzed by P 3 approximation theory, the lig ht distribution of this area is dependent on scattering phase function of tissue . The influence of the structure factor (α) of the combined phase function on the diffuse reflectance light distribution close to source is studied in this paper. The research shows that when the transport MFP is kept constant, the lig ht distribution close to source changes with the anisotropy factor g, but al most does not change in the region of the diffusion approximation; the influence of α on the diffuse reflectance is much more than the influence of the hig h-order moments of phase function on it. The research is very valuable for the in vivo measurement in endoscopic mode or in superficial tissue based on the spa tial-resolved diffuse reflectance.

关 键 词：医用光学与生物技术 相函数 P3近似 空间分辨漫反射 

分 类 号：Q631[生物学—生物物理学]