In previous work, we attempted to identify events using sensor data from full-night polysomnography studies using a global 20-second oximetry sensor lag across all studies. However, we observed that oxygen desaturation onset trailed the corresponding human expert-labeled events by varying amounts of time, even within the same study. In this work, we estimate the localized ideal oximetry (SpO2) sensor lag using the cross-correlation between the labeled disordered breathing event and the observed desaturation.
Snider, Brian and Kain, A, "Estimation of Localized Ideal Oximetry Sensor Lag Via Oxygen Desaturation-Disordered Breathing Event Cross-Correlation" (2017). Faculty Publications - Department of Electrical Engineering and Computer Science. 18.