生物组织中高阶光学参量对空间分辨漫反射的影响  

Influence of the High-order Parameters on Tissue Spatially Resolved Reflectance

作　　者：单筱莜[1] 刘迎[2] 田会娟[2] 高宗慧[2] 王利军[2] 

机构地区：[1]鞍山师范学院,辽宁省鞍山市114005 [2]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,天津300072

出　　处：《光电子．激光》2006年第6期767-771,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学资金资助项目(60278004)

摘　　要：采用Monte Carlo方法,研究了生物组织的二阶和三阶光学参量对空间分辨漫反射率R(ρ)的影响。当光源与探测器间距离ρ为几个输运平均自由程lt时,漫射近似理论不再适用,R(ρ)与散射相函数的高阶Legendre矩有关。研究表明:二阶光学参量γ对R(ρ)的影响范围约为5lt,在0.6lt<ρ<5lt范围内,R(ρ)随γ减小而降低;三阶光学参量δ对R(ρ)的影响范围约为2lt,在0.3lt<ρ<2lt内,R(ρ)随δ增加而降低;并且当不满足Δδ<<Δγ的条件时,δ对R(ρ)的影响会补偿γ的影响,使R(ρ)与γ的关系变得无规律。Influences of the second-order and third-order parameters of biological tissue on the spatially resolved diffuse reflectance are studied with Monte Carlo simulation. The reflectance R（ρ） is dependent on high-order moments of the tissues for a short source-detector separation, so the diffusion approximation theory fails to describe accurately R （ρ）. It is found that the effective region of second-order parameter γ is about 5l1 （transport mean free path） ,and the curve of the reflectance R（ρ） rises with γ in the region of 0.6l1 〈 ρ〈5l1. The effects of third-order parameter δ on the reflectance R （ρ） are studied, and the effective region is about 2l1. We find that the curves of the reflectance R （ρ） depresses with δ in the region of 0. 3l1〈ρ〈2l1,and the effect of γ on RMC（ρ） appears irregular because that the effect of γ be counteracted by the effect of δ when the condition of Δδ〈〈 Δγ is not satisfied.

关 键 词：空间分辨漫反射率 散射相函数 MONTE CARLO模拟 

分 类 号：R318.51[医药卫生—生物医学工程]