视细胞浓度分布对散射光偏振性的影响

人眼视网膜是一种具有高散射特性的生物组织。基于米氏散射理论研究光在视网膜组织中的传输过程对生物组织散射成像具有重要意义。根据解剖学上视网膜结构与细胞分布的特点,引入分子动力学领域的静态结构因子修正辐射传递理论,并采用离散坐标法求解视细胞对散射光偏振性的影响。结果表明散射光偏振性取决于视细胞尺寸与浓度分布等因素。在不同的极角和光程位置,散射光束的偏振性呈现波动性变化,视锥细胞核比视杆细胞核具有更强的散射特性,散射光束的偏振特性变化随散射角的增大而增大。

Visual Cell Concentration Effect on the Polarization of Scattered Light

Human′s eye is a biological tissue with high scattering. Analysis on light propagation in human′s eye based on Mie theory has great significance on the research of multi-scattering imaging in biological tissue. According to the anatomical retinal structure and cellular distribution, a static structure factor from molecular dynamics is introduced to revise the radiative transfer theory, and the polarization of scattered light is numerically solved by the discrete ordinate method (DOM). The numerical results show that the polarization of scattered light depends on the cellular size and concentration distribution etc. Light polarization fluctuates for different polar angles and optical paths, and cone nucleus has more intrinsic polarization than rod nucleus. The variance of scattered light polarization increases as the scattering angle increases.