Secondly, the mathematical radiation extinction model of nonspherical particle is developed based on T-matrix method, and a computer program is designed to calculate the extinction cross section, scattering cross section, absorption cross section and scattering phase function of fixed or randomly oriented axially symmetric particle. 然后根据T矩阵方法,采用回转体微粒消光特性的计算模型编制出的相应程序,对固定取向和随机取向的非球形回转体微粒的消光截面、散射截面、吸收截面及散射相函数进行了计算。
Based on equivalent particle scattering model, Mie theory is introduced to calculate the scattering phase function, anisotropy factor and scattering coefficient of biological tissue. 根据等效颗粒散射模型,运用经典的Mie理论,对生物组织的散射相函数、各向异性因子及散射系数进行了数值计算。