混浊介质中光子的迁移程长研究  

Investigations on Path-Length of Photons Migrating in Turbid Media

作　　者：罗云瀚[1] 贺忠海[1] 韩永辉[1] 谷筱玉[1] 徐可欣[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《中国激光》2005年第8期1150-1154,共5页Chinese Journal of Lasers

基　　金：国家"十五"科技攻关(2004BA706B12)资助项目。

摘　　要：从时间分辨漫射方程出发推导了混浊介质中光子的程长概率分布函数,研究了平均程长、最可几程长与组织光学特性参数以及光源检测器之间的距离的关系。结果显示,约化散射系数对程长分布的影响要大于吸收系数的影响;平均程长在整个范围内与光源检测器之间的距离呈现良好的线性关系;而最可几程长在光源检测器之间的距离较大时与其呈线性关系。蒙特卡罗模拟结果显示与理论计算结果吻合。A possibility distribution for photon path-length in turbid media is derived from the analytical solution of time resolved diffusion equation. And subsequently, mean path-length, path-length of maximum probability are investigated as a function of tissue optical properties and source-detector separation respectively. It is found that reduced scattering coefficient has a greater influence on path-length distribution than absorption coefficient, and mean path-length is in linearity relation with source-detector separation in its whole range, whereas path-length of maximum probability is in linearity relation with source-detector separation only in case of large source-detector separation. Monte Carlo simulations have shown good agreements with theoretical analysis。

关 键 词：医用光学与生物技术 漫射理论 光程长 光学参数 蒙特卡罗模拟 

分 类 号：R318.51[医药卫生—生物医学工程]