Diffusion of intensity-modulated near-infrared light in turbid media
Diffusion of intensity-modulated near-infrared light in turbid media
复制标题
调强近红外光在浑浊介质中的扩散
DOI：
10.1117/12.44184
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发表时间：
1991
期刊：
影响因子：
3.6
通讯作者：
W. Mantulin
中科院分区：
文献类型：
--
作者：
J. Fishkin;E. Gratton;M. Vandeven;W. Mantulin
光在浑浊介质中的传播可以用光子扩散来描述。在频域中，正弦强度调制光产生具有相干前的漫射波。在均匀介质中，波前以恒定相速度传播，振幅随扩散波的推进呈指数衰减。我们研究了具有正弦强度调制粒子点源的单速线性输运方程的扩散近似，并利用均匀散射和吸收介质的频域检测方法进行了实验，以检验上述输运方程在混浊介质中光子迁移的适用性。我们利用齐次无限介质中线性输运方程的解析解，通过对频域数据的简单分析，确定了线性散射和吸收系数。
Light propagation in turbid media can be described by photon diffusion. In the frequency domain, sinusoidally intensity-modulated light gives rise to diffusive waves which have a coherent front. In a homogeneous medium, the wave front propagates with a constant phase velocity and the amplitude attenuates exponentially as the diffusional wave advances. We have studied the diffusion approximation to the one-speed linear transport equation with a sinusoidally intensity modulated point source of particles and performed experiments using frequency domain detection methods on homogeneous scattering and absorbing media to test the applicability of the above mentioned transport equation to photon migration in turbid media. We have used the analytical solutions of the linear transport equation in homogeneous, infinite media to determine via a simple analysis of our frequency domain data the linear scattering and absorption coefficients.