Department of Electrical Engineering, Signal Processing Systems group, Eindhoven University of Technology, Den Dolech 2, Eindhoven, 5612 AZ, The Netherlands.
Patient Care Solutions, Philips Research, High Tech Campus 34, Eindhoven, 5656 AE, The Netherlands.
Adv Exp Med Biol. 2013;789:411-417. doi: 10.1007/978-1-4614-7411-1_55.
To expand applicability of pulse oximetry in low-acuity ambulatory settings, the impact of motion on extracted parameters as saturation (SpO2) and pulse rate (PR) needs to be reduced. We hypothesized that sensor motion relative to the skin can be used as an artifact reference in a correlation canceller to reduce motion artifacts in photoplethysmograms (PPGs), in order to improve SpO2 and PR measurements. This has been proven true in in vivo measurements, where forehead PPGs have been obtained while subjects are walking on a treadmill and relative sensor motion has been measured via self-mixing interferometry. By using relative motion in a normalized least mean square algorithm, the standard deviation of SpO2 and PR errors is on average reduced by 31 % and 13 %, respectively.
为了扩大脉搏血氧饱和度仪在低 acuity 门诊环境中的适用性，需要降低运动对提取参数（如饱和度（SpO2）和脉搏率（PR））的影响。我们假设，传感器相对于皮肤的运动可以用作相关消除器中的伪影参考，以减少光体积描记图（PPG）中的运动伪影，从而改善 SpO2 和 PR 测量。这在体内测量中已经得到证实，在这些测量中，当受试者在跑步机上行走时获得额部 PPG，并且通过自混合干涉测量法测量相对传感器运动。通过在归一化最小均方算法中使用相对运动，SpO2 和 PR 误差的标准差平均分别降低了 31%和 13%。
