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首页> 外文会议>Conference on Photon Migration and Diffuse - Light Imaging; Jun 22-23, 2003; Munich, Germany >Influence of the boundary conditions on the accuracy of diffusion theory in frequency-resolved spectroscopy
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Influence of the boundary conditions on the accuracy of diffusion theory in frequency-resolved spectroscopy

机译：边界条件对频率分辨光谱中扩散理论精度的影响

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摘要

A detailed investigation of the use of time-resolved reflectance and frequency-resolved reflectance for the optical characterization of scattering medium such as breast tissues based on the diffusion equation has been performed. Two different boundary conditions were imposed at the air-tissue interface : the first use the" zero real surface" (ZRS), the second refers to the " zero extrapolated surface" (ZES). To simplify the preliminary analysis, the tissues have been assimilated to a semi-infinite geometry or a slab sufficiently thick. Among the results, the computation showed that at low frequency approximation, the determination of the phase angle shift is independent of whatever boundary conditions is applied. Consequently breast tissue optical properties would be retrieved by means of frequency resolved data (modulation and phase) recorded at two different radial distances. For modulated light at f≈20 MHz, and using a model accounting for simple ZRS formulation. Under thes approximations discrepancies are within 3% for μ_a and 0.5% for μ'_s.
机译：已经进行了基于时间分辨反射率和频率分辨反射率的详细研究，以基于扩散方程对诸如乳腺组织的散射介质进行光学表征。在空气组织界面处施加了两个不同的边界条件：第一个使用“零实际表面”（ZRS），第二个使用“零外推表面”（ZES）。为了简化初步分析，已将组织同化为半无限几何形状或足够厚的平板。结果表明，在低频近似下，相角偏移的确定与所施加的任何边界条件无关。因此，将通过在两个不同的径向距离处记录的频率分辨数据（调制和相位）来检索乳腺组织的光学特性。对于f≈20MHz的调制光，并使用一个模型说明简单的ZRS公式。在近似值下，μ_a的误差在3％以内，μ'_s的误差在0.5％以内。

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