Annu Int Conf IEEE Eng Med Biol Soc. 2021 Nov;2021:7091-7094. doi: 10.1109/EMBC46164.2021.9630847.
Non-expensive methods for measuring heart rate and oxygen saturation are of great importance in the scope of the COVID-19 outbreak to follow up on the symptoms and help to control the disease.Smartphones are widely available and their cameras can be used to acquire relevant physiological data, such as Photo-plethysmography (PPG) signals. Covering a light source and the camera sensor with a finger, it is possible to acquire the camera-based photoplethysmography (cbPPG) signal. Two methods were analyzed in this work, namely using the rear smartphone camera and the flash LED, and using the front camera and device display as a light source. The latter presents more advantages overall - in particular, greater control over the emitted light and finger detection - and better results were found when compared to a reference device.Clinical relevance- This technology allows the pervasive monitoring of the PPG signal using a standard smartphone, providing a tool to evaluate the subject's heart rate and its variability, respiration, blood oxygenation, etc.
在 COVID-19 疫情爆发期间，非昂贵的心率和血氧饱和度测量方法对于监测症状和帮助控制疾病非常重要。智能手机广泛普及，其摄像头可用于获取相关生理数据，如光电体积描记法（PPG）信号。用手指覆盖光源和摄像头传感器，就可以获取基于摄像头的光电体积描记法（cbPPG）信号。本工作分析了两种方法，即使用后置智能手机摄像头和闪光灯 LED，以及使用前置摄像头和设备显示屏作为光源。后者总体上具有更多优势 - 特别是可以更好地控制发射光和手指检测 - 并且与参考设备相比，发现效果更好。临床相关性- 这项技术允许使用标准智能手机进行 PPG 信号的普及监测，提供了一种评估受试者心率及其变异性、呼吸、血氧等的工具。
