在手腕的光电显微镜信号质量的决定因素
Peter H Charlton1,2, Vaidotas Marozas3,4, Elisa Mejía-Mejía5
1Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom.
PLOS digital health
|June 27, 2025
概括
手腕光电显微镜 (PPG) 信号质量对于准确的生理监测至关重要. 这项研究发现,仰卧姿势和传感器在心脏高度的位置显著改善了PPG信号质量,而年龄和皮肤色调等因素具有混合作用.
科学领域:
- 生物医学工程 生物医学工程
- 生理监测 生理监测
- 可穿戴技术可穿戴技术
背景情况:
- 手腕光电显微镜 (PPG) 信号是消费者健康设备的组成部分.
- PPG信号易受噪声影响,影响监测生理参数的准确性.
- 了解影响PPG信号质量的因素对于可靠的健康监测至关重要.
研究的目的:
- 调查姿势和传感器高度对手腕PPG信号质量的影响.
- 确定影响基于PPG的生理测量准确性的关键因素.
主要方法:
- 使用了Aurora-BP数据集,包括来自1,142个不同受试者的反射手腕PPG信号.
- 获得PPG数据横跨卧卧,坐着和站立的姿势,与不同的传感器高度.
- 计算的信号噪声比 (SNR),透指数 (PI) 和模板匹配相关系数 (TMCC) 作为质量指标.
主要成果:
- 仰卧姿势产生了最高的信号质量 (SNR:18.6 dB),其次是坐着 (13.7 dB) 和站着 (9.0 dB).
- 将传感器提高到心脏高度显著改善了所有姿势的信号质量.
- 年龄与SNR和TMCC呈正相关性;肌肤色效应复杂,受LED光强度调整的影响.
结论:
- 姿势和传感器高度是手腕PPG信号质量的关键决定因素.
- 最佳的信号采集发生在卧卧的位置,传感器处于心脏水平.
- 调整LED强度对于保持不同肤色的信号质量至关重要.
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