Reconstruction of Corrupted Photoplethysmography Signals to Facilitate Continuous Monitoring.
2023 Computing in Cardiology (CinC)(2023)
摘要
Photoplethysmography (PPG) is the leading technology behind wearables, significantly hindered by PPG's susceptibility to motion artifacts (MAs). This study presents a PPG reconstruction algorithm operating regardless of the source of noise. Artifact detection is initially performed by spectral and amplitude-based control. Morphology, spectral and heart-rate (HR) variability (HRV) information of the adjacent clean segments are used for reconstruction. Thirty-six originally clean PPGs with added noise of 2–120 s were used. Recordings were resampled to 250 Hz. HR and HRV features were compared between original and reconstructed PPGs via Pearson correlation (
$\rho$
), Bland-Altman (BA), normalized root mean square error (nRMSE) and mean absolute percentage error (MAPE) analysis. For HR,
$\rho > 0.9$
for all noise lengths. Time-domain HRV:
$\rho > 0.91$
. Frequency-domain HRV:
$\rho > 0.75$
. Poincaré indices:
$\rho > 0.85$
. Max. nRMSE: 0.58%, max. MAPE: 1.72%. At least 86% of recordings were within confidence interval, with most results being between 89%–97%, regardless of the noise duration. The proposed algorithm allows the reconstruction of corrupted PPG signals. The noise duration cut-off for optimal results is 30–45 s. Nevertheless, it can be applied in longer segments, still providing satisfactory results.
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