Chernomordik V, Nossal R, Gandjbakhche A H
Division of Computer Research and Technology, National Institutes of Health, Bethesda, Maryland 20892, USA.
Med Phys. 1996 Nov;23(11):1857-61. doi: 10.1118/1.597748.
Simple scaling arguments are used to determine spatial resolution achievable in time-resolved transillumination experiments involving highly diffuse media. These arguments allow us to obtain relationships linking target resolution at different planes inside an optically turbid slab to the gating times of the imaging system. We show that this approach yields the same results as those obtained previously from an approximate and rather complicated analytical derivation. In addition, we are now able to assess the effects of scattering anisotropy on spatial resolution attainable when gating times are so short that a constant scaling of photon transport scattering length is not appropriate. These results should enable one to devise more accurate and simpler image reconstruction algorithms.
简单的尺度论证被用于确定在涉及高度漫射介质的时间分辨透照实验中可实现的空间分辨率。这些论证使我们能够获得将光学浑浊平板内不同平面处的目标分辨率与成像系统的选通时间联系起来的关系。我们表明，这种方法产生的结果与先前从一个近似且相当复杂的解析推导中获得的结果相同。此外，当选通时间非常短时，光子输运散射长度的恒定尺度不再适用，我们现在能够评估散射各向异性对可实现的空间分辨率的影响。这些结果应该能使人们设计出更准确、更简单的图像重建算法。
