Mie理论在生物组织散射特性分析中的应用

Application of Mie theory in biological tissue scattering characteristics analysis

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.计算结果表明:可见光照射生物组织时,各向异性因子、散射系数随等效颗粒直径增大而增大;等效颗粒直径较小时,各向异性因子、散射系数随入射光波长增大而单调减小;随着等效颗粒直径增大,各向异性因子、散射系数随入射光波长变化不再具有单调性.上述计算结果可合理解释公布的实验结果.

Based on equivalent particle scattering model, Mie theory is introduced to calculate the scattering phase function, anisotropy factor and scattering coefficient of biological tissue. Numerical results show that the anisotropy factor and scattering coefficients increase with the increasing of the equivalent particle＇ s diameter when the tissue is irradiated by visible light; the anisotropy factor and scattering coefficients decrease monotonously with the increasing of incident light wavelengths when the equivalent particle＇s diameter is relatively small; the anisotropy factor and scattering coefficients have no monotonicity with respect to the wavelengths when the equivalent particle＇s diameter is big. The above numerical results explain the published experiments well.