发表机构
Tufts University（塔夫茨大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究针对深肤色患者血氧饱和度高估问题，提出黑色素与线宽校正的漫射光学校准方程，并在98名患者数据上验证，显示误差对黑色素依赖性降低，支持光谱着色理论。
AI 中文摘要
目前的脉搏血氧仪在深色皮肤患者中往往高估动脉血氧饱和度，从而增加隐匿性低氧血症的发生率。一种提出的机制是光谱着色：黑色素有助于重塑宽线宽光源的检测光谱，使得校准背后的波长相关参数依赖于肤色。漫射光学理论允许一种黑色素和线宽校正的校准方程，据我们所知，该方程从未在体内进行过测试。在这项工作中，我们将经验线性方程、漫射光学理论方程及其校正形式拟合到公开的OpenOximetry数据存储库——考虑了98名患者，这些患者具有配对的动脉血液抽取、原始光电容积脉搏波图和皮肤反射光谱。三种方法之间的准确性实际上无法区分，然而饱和度误差对黑色素的依赖性从每单位黑色素体积分数+2.8个百分点下降到+1.2再到+0.1个百分点——这与光谱着色理论一致。这些对黑色素的依赖性在此处均未在统计上得到解决——需要大约十倍大的队列——因此该校正得到理论及其预期方向的支持。所有三种校准方法都带有两个自由度：理论方程落入现有的校准程序中，而其黑色素感知形式需要每位患者的皮肤色调测量。这项工作展示了理论脉搏血氧测定模型如何在校准中应用。
英文摘要
Current pulse oximeters tend to overestimate arterial saturation in darkly pigmented patients, increasing occult hypoxemia rates. One proposed mechanism is spectral coloring: melanin contributes to reshaping the detected spectrum of a broad-linewidth source, making the wavelength-dependent parameters behind calibration skin-tone-dependent. Diffuse optics theory allows for a melanin- and linewidth-corrected calibration equation, which to our knowledge has never been tested in vivo. In this work, we fit the empirical linear equation, the diffuse optics theoretical equation, and its corrected form to the public OpenOximetry Repository---considering 98 patients with paired arterial blood-draws, raw photoplethysmograms, and skin reflectance spectra. Accuracy is practically indistinguishable between the three approaches, yet the saturation error's dependence on melanin falls from +2.8 to +1.2 to +0.1 percentage points per unit melanin volume fraction---consistent with the spectral-coloring theory. None of these dependencies on melanin are statistically resolved here---a cohort roughly ten times larger is needed---so the correction is backed by theory and its expected direction. All three calibration approaches carry two degrees of freedom: the theoretical equation drops into existing calibration procedures, and its melanin-aware form needs a per-patient skin-tone measurement. This work demonstrates how the theoretical pulse oximetry model can be applied in calibration.
