Improving pulse oximetry accuracy by removing motion artifacts from photoplethysmograms using relative sensor motion:
R W C G R Wijshoff1, M Mischi2, P H Woerlee3
1Department of Electrical Engineering, Signal Processing Systems group, Eindhoven University of Technology, Den Dolech 2, Eindhoven, 5612 AZ, The Netherlands. R.W.C.G.R.Wijshoff@tue.nl.
Advances in Experimental Medicine and Biology
|July 16, 2013
Summary
Motion artifacts in pulse oximetry can be reduced by using sensor motion as a reference. This improves the accuracy of blood oxygen saturation (SpO2) and pulse rate (PR) measurements, especially in ambulatory settings.
Area of Science:
- Biomedical Engineering
- Medical Devices
- Physiological Monitoring
Background:
- Pulse oximetry is crucial for monitoring blood oxygen saturation (SpO2) and pulse rate (PR).
- Motion artifacts significantly degrade the accuracy of pulse oximetry readings in ambulatory settings.
- Existing methods struggle to mitigate motion-induced errors effectively.
Purpose of the Study:
- To reduce motion artifacts in photoplethysmograms (PPGs) for improved SpO2 and PR measurements.
- To investigate the use of relative sensor motion as an artifact reference signal.
- To enhance the applicability of pulse oximetry in low-acuity ambulatory environments.
Main Methods:
- Developed a method using relative sensor motion as an artifact reference.
- Employed a correlation canceller with a normalized least mean square algorithm.
- Acquired in vivo forehead PPGs and measured relative sensor motion via self-mixing interferometry during treadmill walking.
Main Results:
- Successfully reduced motion artifacts in PPG signals.
- On average, the standard deviation of SpO2 errors decreased by 31%.
- On average, the standard deviation of PR errors decreased by 13%.
Conclusions:
- Relative sensor motion can effectively serve as an artifact reference to improve pulse oximetry accuracy.
- The proposed method enhances the reliability of SpO2 and PR measurements in the presence of motion.
- This technique holds promise for expanding the use of pulse oximetry in ambulatory care settings.
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