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PPG motion artifact handling using a self-mixing interferometric sensor

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These file attachments have been under embargo and were made available to the public after the embargo was lifted on 28 March 2011.

Cite or link this publication as: doi:doi:10.1117/12.874170
Author: Wijshoff, R.W.C.G.R. · Veen, J. · Van der Lee, A.M. · Mulder, L. (HemoLab) · Stijnen, J.M.A. (HemoLab) · Van Tuijl, S. (HemoLab) · Aarts, R.M.
Type:Conference paper
Date:2011-03-28
Embargo lifted:2011-03-28
Publisher: SPIE (International Society for Optical Engineering)
Institution: Philips Research
Source:SPIE Photonics West 2011, San Francisco, USA, 22-27 January 2011; SPIE 7894: Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI; doi: 10.1117/12.874170
Identifier: MS 32.168
doi: doi:10.1117/12.874170
Keywords: adaptive noise cancellation · cardiovascular modeling · in vitro testing · motion artifacts · photoplethysmography · pulse oximetry · signal processing · skin modelling
Rights: (c) SPIE (International Society for Optical Engineering)

Abstract

Pulse oximeters measure a patient’s heart rate and blood oxygenationby illuminating the skin and measuring the intensity of the light that has propagated through it. The measured intensities, called photoplethysmograms (PPGs), are highly susceptible to motion, which candistort the PPG derived data. Part of the motion artifacts are considered to result from sensor deformation, leading to a change in emitter-detector distance. It is hypothesized that these motion artifacts correlate to movement of the emitter with respect to the skin. This has been investigated in a laboratory setup in which motion artifacts can be reproducibly generated by translating the emitter with respect to a flowcell that models skin perfusion. The top of the flowcell is a diffuse scattering Delrin skin phantom under which a cardiac induced blood pulse is modeled by a changing milk volume. By illuminating the flowcell, a PPG can be measured. The emitter’s translation has been accurately measured using self-mixing interferometry (SMI). The motion artifacts in the PPG as a result of emitter motion are shown to correlate with the emitter’s displacement. Moreover, it is shown that these artifacts are significantly reduced by a least-mean-square algorithm that uses the emitter’s displacement measured via SMI as artifact reference.

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