Paperdoi:10.3390/bioengineering3040021
Optimal Signal Quality Index for Photoplethysmogram Signals
Bioengineering
TL;DR
Compared eight SQIs (perfusion, kurtosis, skewness, relative power, non-stationarity, zero crossing, entropy, matching of systolic-wave detectors) on 106 x 60 s PPG recordings with three adjudicated labels (excellent / acceptable / unfit). Skewness (SSQI) outperformed the others: overall F1 86.0% / 87.2% / 79.1% across the three pairwise classifications. Optimal windows were short (2-5 s), which fits wearable burst duty cycles.
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Abstract
A photoplethysmogram (PPG) is a noninvasive circulatory signal related to the pulsatile volume of blood in tissue and is typically collected by pulse oximeters. PPG signals collected via mobile devices are prone to artifacts that negatively impact measurement accuracy, which can lead to a significant number of misleading diagnoses. Given the rapidly increased use of mobile devices to collect PPG signals, developing an optimal signal quality index (SQI) is essential to classify the signal quality from these devices. Eight SQIs were developed and tested based on: perfusion, kurtosis, skewness, relative power, non-stationarity, zero crossing, entropy, and the matching of systolic wave detectors. Two independent annotators annotated all PPG data (106 recordings, 60 s each) and a third expert conducted the adjudication of differences. The independent annotators labeled each PPG signal with one of the following labels: excellent, acceptable or unfit for diagnosis. All indices were compared using Mahalanobis distance, linear discriminant analysis, quadratic discriminant analysis, and support vector machine with leave-one-out cross-validation. The skewness index outperformed the other seven indices in differentiating between excellent PPG and acceptable, acceptable combined with unfit, and unfit recordings, with overall F 1 scores of 86.0%, 87.2%, and 79.1%, respectively.
Verbatim from the publisher's DOI record (opens in a new tab) · Publisher licence: https://creativecommons.org/licenses/by/4.0/
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Cite this paper
Elgendi, M. (2016). Optimal Signal Quality Index for Photoplethysmogram Signals. Bioengineering. https://doi.org/10.3390/bioengineering3040021
Elgendi, Mohamed. 2016. "Optimal Signal Quality Index for Photoplethysmogram Signals." Bioengineering. https://doi.org/10.3390/bioengineering3040021.
Elgendi, M. (2016) 'Optimal Signal Quality Index for Photoplethysmogram Signals', Bioengineering. doi: 10.3390/bioengineering3040021.
Elgendi, Mohamed "Optimal Signal Quality Index for Photoplethysmogram Signals." Bioengineering, 2016. https://doi.org/10.3390/bioengineering3040021.
M. Elgendi, "Optimal Signal Quality Index for Photoplethysmogram Signals," Bioengineering, 2016, doi: 10.3390/bioengineering3040021.
@article{elgendi2016optimal,
title = {{Optimal Signal Quality Index for Photoplethysmogram Signals}},
author = {Elgendi, Mohamed},
year = {2016},
journal = {Bioengineering},
doi = {10.3390/bioengineering3040021}
}Added to the ChatPPG research hub
