Shao Dangdang, Tsow Francis, Liu Chenbin, Yang Yuting, Tao Nongjian
IEEE Trans Biomed Eng. 2017 May;64(5):1003-1010. doi: 10.1109/TBME.2016.2585109. Epub 2016 Jun 29.
We present a noncontact method to measure ballistocardiogram (BCG) and photoplethysmogram (PPG) simultaneously using a single camera. The method tracks the motion of facial features to determine displacement BCG, and extracts the corresponding velocity and acceleration BCGs by taking first and second temporal derivatives from the displacement BCG, respectively. The measured BCG waveforms are consistent with those reported in the literature and also with those recorded with an accelerometer-based reference method. The method also tracks PPG based on the reflected light from the same facial region, which makes it possible to track both BCG and PPG with the same optics. We verify the robustness and reproducibility of the noncontact method with a small pilot study with 23 subjects. The presented method is the first demonstration of simultaneous BCG and PPG monitoring without wearing any extra equipment or marker by the subject.
我们提出了一种使用单台相机同时测量心冲击图（BCG）和光电容积脉搏波图（PPG）的非接触式方法。该方法通过跟踪面部特征的运动来确定位移BCG，并分别从位移BCG的一阶和二阶时间导数中提取相应的速度和加速度BCG。所测量的BCG波形与文献中报道的波形一致，也与基于加速度计的参考方法记录的波形一致。该方法还基于来自同一面部区域的反射光来跟踪PPG，这使得使用相同的光学设备同时跟踪BCG和PPG成为可能。我们通过对23名受试者进行的小型初步研究验证了该非接触式方法的稳健性和可重复性。所提出的方法首次证明了受试者无需佩戴任何额外设备或标记即可同时监测BCG和PPG。
