Yang Chenxi, Dong Yudi, Chen Yingying, Tavassolian Negar
Annu Int Conf IEEE Eng Med Biol Soc. 2018 Jul;2018:1-4. doi: 10.1109/EMBC.2018.8513270.
This paper presents a smartphone-only solution for measuring pulse transit time (PTT). An application based on an Android smartphone is developed to collect seismocardiogram (SCG), gyrocardiogram (GCG), and photoplethysmography (PPG) recordings. The system does not need any other external system for measurements, so the total cost and system complexity are minimized. PTT metrics are calculated as the time difference between the aortic valve opening points in the SCG or GCG signals recorded by the accelerometer or gyroscope of a smartphone respectively, and the fiducial points in the PPG signal recorded by a modified optical sensor connected to the audio input. A digital signal processing (DSP) system is developed in a post-processing environment and experimentally validated on ten healthy subjects at rest. Our results indicate that a smartphone-only PTT measurement system is feasible and comparable with stand-alone sensor node systems.
本文提出了一种仅使用智能手机测量脉搏传输时间（PTT）的解决方案。开发了一个基于安卓智能手机的应用程序，用于收集心震图（SCG）、心陀螺图（GCG）和光电容积脉搏波描记图（PPG）记录。该系统不需要任何其他外部系统进行测量，因此总成本和系统复杂性降至最低。PTT指标分别计算为智能手机的加速度计或陀螺仪记录的SCG或GCG信号中主动脉瓣开放点与连接到音频输入的改进型光学传感器记录的PPG信号中的基准点之间的时间差。在一个后处理环境中开发了一个数字信号处理（DSP）系统，并在十名静息状态的健康受试者身上进行了实验验证。我们的结果表明，仅使用智能手机的PTT测量系统是可行的，并且与独立传感器节点系统相当。
