Filtering-induced time shifts in photoplethysmography pulse features measured at different body sites: the importance of filter definition and standardization.

Physiological Measurement
Haipeng LiuDingchang Zheng

Abstract

Objective.The waveform of a photoplethysmography (PPG) signal depends on the measurement site and individual physiological conditions. Filtering can distort the morphology of the original PPG signal waveform and change the timing of pulse feature points on PPG signals. We aim to quantitatively investigate the effect of PPG signal morphology (related to measurement site) and type of pulse feature on the filtering-induced time shift (TS).Approach.60 s PPG signals were measured from six body sites (finger, wrist under (volar), wrist upper (dorsal), earlobe, and forehead) of 36 healthy adults. Using infinite impulse response digital filters which are common in PPG signal processing, PPG signals were prefiltered (band-pass, pass and stop bands: >0.5 Hz and <0.2 Hz for high-pass filter, <20 Hz and >30 Hz for low-pass filter) and then filtered (low-pass, pass and stop bands: <3 Hz and >5 Hz). Four pulse feature points were defined and extracted (peak, valley, maximal first derivative, and maximal second derivative). For each subject, overall TS and intra-subject TS variability in feature points were calculated as the mean and standard deviation of TS between prefiltered and filtered PPG signals in 50 cardiac cycles. Statistical testin...Continue Reading

References

Feb 17, 2015·Computational and Mathematical Methods in Medicine·Rong-Chao PengYuan-Ting Zhang
Jan 7, 2016·Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society·Vala JeyhaniAntti Vehkaoja
Apr 7, 2018·Computational and Mathematical Methods in Medicine·William WaughThomas A W Beale
May 2, 2018·Scientific Data·Yongbo LiangRabab Ward
Mar 20, 2020·Healthcare Technology Letters·Patrick CelkaJordi Alastruey
Aug 19, 2020·Scientific Reports·Qunfeng TangMohamed Elgendi

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