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Proceedings Paper

PPG motion artifact handling using a self-mixing interferometric sensor
Author(s): Ralph W. C. G. R. Wijshoff; Jeroen Veen; Alexander M. van der Lee; Lars Mulder; Marco Stijnen; Sjoerd van Tuijl; Ronald M. Aarts
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Paper Abstract

Pulse oximeters measure a patient's heart rate and blood oxygenation by 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 can distort 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.

Paper Details

Date Published: 16 February 2011
PDF: 13 pages
Proc. SPIE 7894, Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI, 78940F (16 February 2011); doi: 10.1117/12.874170
Show Author Affiliations
Ralph W. C. G. R. Wijshoff, Eindoven Univ. of Technology (Netherlands)
Philips Research Nederland B.V. (Netherlands)
Jeroen Veen, Philips Research Nederland B.V. (Netherlands)
Alexander M. van der Lee, Philips Research Nederland B.V. (Netherlands)
Lars Mulder, HemoLab BV (Netherlands)
Marco Stijnen, HemoLab BV (Netherlands)
Sjoerd van Tuijl, HemoLab BV (Netherlands)
Ronald M. Aarts, Eindoven Univ. of Technology (Netherlands)
Philips Research Nederland B.V. (Netherlands)

Published in SPIE Proceedings Vol. 7894:
Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI
Israel Gannot, Editor(s)

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