Conference proceeding
Mitigation of Motion Artifacts in Pulse Oximetry through Redundant Sensors
2022 Signal Processing Algorithms Architectures Arrangements and Applications (SPA), pp 46-51
21 Sep 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Photoplethysmography (PPG) signals are used in pulse oximetry to calculate peripheral capillary oxygen saturation (SpO(2)) levels. It is well known that the accuracy of the calculated SpO(2) is susceptible to motion noise. Using field data collected from human subjects during rest and while exhibiting medium to high-intensity physical exercises, we show how sensor redundancy can mitigate motion effects by employing two channels of red and infrared PPG signals. We demonstrate the advantage of redundancy using two SpO(2) calculation methods. These methods are widely used "Red over Infrared" (RoI) method and the Discrete Saturation Transform (DST) algorithm both, assisted by pre-filtering by a heart-rate tuned comb filter. The data were collected from individuals at rest and while exercising. SpO(2) levels are calculated for two channels, each using a red and an infrared PPG signal. We integrated the SpO(2) computed from the two channels with a Kalman filter (KF) and computed the SpO(2) mean absolute error (MAE) from each channel individually and after integrating the two channels. The SpO(2) MAEs of each one of the two channels separately were greater (and statistically significant) than the SpO(2) MAE obtained from the two channels integrated with a KF. We observed that when two channels of PPG (red and infrared) signals were available, then combining SpO(2) levels obtained from these two channels exhibited a smoother and more reliable estimate of the blood oxygen saturation level as compared the SpO(2) levels computed from each channel separately. The reason is that if the data for the two channels are collected at sufficient physical distance from one another, the motion artifacts affecting the two channels are uncorrelated. The KF is then able to use past measurements and modeling of the dynamics to attenuate the effect of the motion artifacts.
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Details
- Title
- Mitigation of Motion Artifacts in Pulse Oximetry through Redundant Sensors
- Creators
- Ludvik Alkhoury - New Jersey Institute of TechnologyJiwon Choi - New Jersey Institute of TechnologyChizhong Wang - New Jersey Institute of TechnologySean Mahoney - Athena GTX (United States, Johnston)Barry S. Shender - Naval Air Warfare Center Aircraft Division (United States, Patuxent River) - NAVAIRLeonid Hrebien - Drexel UniversityMoshe Kam - New Jersey Institute of Technology
- Publication Details
- 2022 Signal Processing Algorithms Architectures Arrangements and Applications (SPA), pp 46-51
- Conference
- 2022 Signal Processing Algorithms Architectures Arrangements and Applications (SPA) (Poznan, Poland, 21 Sep 2022–22 Sep 2022)
- Series
- Signal Processing Algorithms Architectures Arrangements and Applications
- Publisher
- IEEE
- Number of pages
- 6
- Grant note
- N68335-16-C-0085 / U.S. Office of Naval Research (ONR); Office of Naval Research
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000886613600011
- Scopus ID
- 2-s2.0-85143087326
- Other Identifier
- 991020532104604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Computer Science, Software Engineering
- Telecommunications