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首页> 外文会议>Optical diagnostics and sensing XVIII: Toward Point-of-Care Diagnostics >Evaluation of arterial oxygen saturation using RGB camera-based remote photoplethysmography
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Evaluation of arterial oxygen saturation using RGB camera-based remote photoplethysmography

机译：使用基于RGB相机的远程光电容积描记法评估动脉血氧饱和度

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摘要

Plethysmogram is the periodic variation in blood volume due to the cardiac pulse traveling through the body. Photo-plethysmograph (PPG) has been widely used to assess the cardiovascular system such as heart rate, blood pressure, cardiac output, vascular compliance. We have previously proposed a non-contact PPG imaging method using a digital red-green-blue camera. In the method, the Monte Carlo simulation for light transport is used to specify a relationship among the RGB-values and the concentrations of oxygenated hemoglobin (C_(HbO)) and deoxygenated hemoglobin (C_(HbR)). The total hemoglobin concentration (C_(HBT)) can be calculated as a sum of C_(HbO) and C_(HnR) Applying the fast Fourier transform (FFT) band pass filters to each pixel of the sequential images for C_(HbT) along the time line, two-dimentional plethysmogram can be reconstructed. In this study, we further extend the method to imaging the arterial oxygen saturation (SaO_2). The PPG signals for both C_(HbO) and C_(HbO) are extracted by the FFT band pass filter and the pulse wave amplitudes (PWAs) of C_(HbO) and C_(HbR) are calculated. We assume that the PWA for C_(HbO) and that for C_(HbR) are decreased and increased as SaO_2 is decreased. The ratio of PWA for C_(HbO) and that for C_(HbR) are associated to the reference value of SaO_2 measured by a commercially available pulse oximeter, which provide an empirical formula to estimate SaO_2 from the PPG signal at each pixel of RGB image. In vivo animal experiments with rats during varying the fraction of inspired oxygen (FiO_2) demonstrated the feasibility of the proposed method.
机译：脉搏波描记器是由于心脏脉冲穿过身体而引起的血容量的周期性变化。光电容积描记器（PPG）已被广泛用于评估心血管系统，例如心率，血压，心输出量，血管顺应性。我们以前已经提出了一种使用数字式红绿蓝相机的非接触式PPG成像方法。在该方法中，使用用于光传输的蒙特卡洛模拟来指定RGB值与氧合血红蛋白（C_（HbO））和脱氧血红蛋白（C_（HbR））的浓度之间的关系。可以将总血红蛋白浓度（C_（HBT））计算为C_（HbO）和C_（HnR）的总和，将快速傅里叶变换（FFT）带通滤波器应用于C_（HbT）的顺序图像的每个像素上在时间线上，可以重建二维体积描记图。在这项研究中，我们将方法进一步扩展到成像动脉血氧饱和度（SaO_2）。通过FFT带通滤波器提取C_（HbO）和C_（HbO）的PPG信号，并计算C_（HbO）和C_（HbR）的脉搏波幅度（PWA）。我们假设随着SaO_2的减少，C_（HbO）和C_（HbR）的PWA会降低和增加。 C_（HbO）和C_（HbR）的PWA之比与通过商用脉搏血氧仪测得的SaO_2的参考值有关，后者提供了经验公式，可从RGB图像中的PPG信号估计SaO_2 。在大鼠体内改变吸入氧气（FiO_2）比例期间的体内动物实验证明了该方法的可行性。

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