Poliński Artur
Department of Biomedical Engineering, Faculty of Electronics, Telecommunication and Informatics, Gdańsk University of Technology, Gabriela Narutowicza 11/12, Gdańsk, Poland.
Physiol Meas. 2023 Mar 17;44(3). doi: 10.1088/1361-6579/acbf00.
The aim of the study is to investigate the effect of the signal sampling frequency and low-pass filtering on the accuracy of the localisation of the fiducial points of the photoplethysmographic signal (PPG), and thus on the estimation of the blood pressure (i.e. the accuracy of the estimation).Statistical analysis was performed on 3,799 data samples taken from a publicly available database. Four PPG fiducial points of each sample signal were examined in the study.Simulation suggests that for noise-free data, cubic spline interpolation causes the sampling frequency (in the considered range of 62.5-500 Hz) to have only limited influence on localisation of the fiducial point. Better results were obtained for the pulse transit time (PTT) than pulse arrival time (PAT) approach. The acceptable filter band depends on the selected fiducial point and PAT or PTT approach. The best results were obtained for the tangent fiducial point.The presented results make it possible to estimate the minimum requirements for the sampling frequency and filtering of the PPG signal in order to obtain a reliable estimation of blood pressure.
本研究的目的是调查信号采样频率和低通滤波对光电容积脉搏波信号（PPG）基准点定位准确性的影响，进而调查其对血压估计（即估计准确性）的影响。对从一个公开可用数据库中获取的3799个数据样本进行了统计分析。本研究检查了每个样本信号的四个PPG基准点。模拟表明，对于无噪声数据，三次样条插值使采样频率（在62.5 - 500 Hz的考虑范围内）对基准点定位的影响有限。脉搏传播时间（PTT）方法比脉搏到达时间（PAT）方法获得了更好的结果。可接受的滤波器频段取决于所选的基准点以及PAT或PTT方法。切线基准点获得了最佳结果。所呈现的结果使得能够估计PPG信号的采样频率和滤波的最低要求，以便获得可靠的血压估计。
