【摘要】 分析了半无限大介质漫射近似不同边界条件的镜像光源结构 ,用镜像光源的方法给出了连续光入射时稳态能流率分布的漫射近似表达式 ,并用MonteCarlo方法对能流率分布进行模拟 ,分析了两种模型能流率分布的特点及其形成的机理 ;用MonteCarlo模拟结果检验了能流率分布漫射近似的精度 ,结果表明 :漫射近似采用EBC边界条件的结果有较高的精度和计算较简单等优点 ,为能流率分布的快速准确计算提供了依据更多还原

【Abstract】 From the diffusion approximation equation, the configuration of image sources for different boundary conditions in a semi-infinite turbid medium are analyzed, the diffusion approximation expressions of the steady-state fluence rate are given by method of image sources and the fluence rate distributions are simulated by using Monte Carlo method, The fluence rate distributions of the two model are analyzed for the two model under the cw-light is directed perpendicularly to the surface of biological tissues. It is shown the diffusion approximation for the EBC boundary condition has the better precision and the calculation is simpler than the other two methods.更多还原