Opt Lett. 2021 Oct 1;46(19):4817-4820. doi: 10.1364/OL.433233.
Robust models for single-fiber reflectance (SFR) are relatively complex [Opt. Lett.45, 2078 (2020)OPLEDP0146-959210.1364/OL.385845] due to overlapping of the illumination and collection areas that entails probability weighting of the spatial integration of photon-remission. We demonstrate, via analytical means for limiting cases and Monte Carlo simulation of broader conditions, that diffuse photon-remission collected by single-fiber geometry may be scaled over the center-illuminated photon-remission. We specify for a medium revealing Henyey-Greenstein (HG) scattering anisotropy that the diffuse photon-remission from a sub-diffusive area of a top-hat illumination is ∼84.9 of that collected over the same area when under a centered-illumination. This ratio remains consistent over a reduced-scattering fiber-size product of =[10,10], for absorption varying 3 orders of magnitude. When applied to hemoglobin oxygenation changes induced in an aqueous phantom using a 200 µm single-fiber probe, the center-illumination-scaled model of SFR produced fitting results agreeing with reference measurements.
由于照明和收集区域的重叠，导致了光子发射的空间积分的概率加权，因此单纤维反射率（SFR）的稳健模型相对复杂[Opt. Lett.45, 2078 (2020)OPLEDP0146-959210.1364/OL.385845]。我们通过对限制情况的分析手段和更广泛条件的蒙特卡罗模拟进行了演示，即在单纤维几何形状下收集的漫射光子发射可以扩展到中心照明的光子发射。我们指定了一个揭示 Henyey-Greenstein（HG）散射各向异性的介质，当在中心照明下，从平顶照明的亚扩散区域收集的漫射光子发射约为相同面积下中心照明收集的 84.9。当散射光纤尺寸乘积为=[10,10]时，吸收变化 3 个数量级，该比值保持不变。当将其应用于使用 200 µm 单纤维探头在水相仿体中诱导的血红蛋白氧合变化时，SFR 的中心照明缩放模型产生的拟合结果与参考测量值一致。
