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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 5, Iss. 7 — Jul. 1, 2014
  • pp: 2362–2375

Quantifying tissue mechanical properties using photoplethysmography

Tony J. Akl, Mark A. Wilson, M. Nance Ericson, and Gerard L. Coté  »View Author Affiliations

Biomedical Optics Express, Vol. 5, Issue 7, pp. 2362-2375 (2014)

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Photoplethysmography (PPG) is a non-invasive optical method that can be used to detect blood volume changes in the microvascular bed of tissue. The PPG signal comprises two components; a pulsatile waveform (AC) attributed to changes in the interrogated blood volume with each heartbeat, and a slowly varying baseline (DC) combining low frequency fluctuations mainly due to respiration and sympathetic nervous system activity. In this report, we investigate the AC pulsatile waveform of the PPG pulse for ultimate use in extracting information regarding the biomechanical properties of tissue and vasculature. By analyzing the rise time of the pulse in the diastole period, we show that PPG is capable of measuring changes in the Young’s Modulus of tissue mimicking phantoms with a resolution of 4 KPa in the range of 12 to 61 KPa. In addition, the shape of the pulse can potentially be used to diagnose vascular complications by differentiating upstream from downstream complications. A Windkessel model was used to model changes in the biomechanical properties of the circulation and to test the proposed concept. The modeling data confirmed the response seen in vitro and showed the same trends in the PPG rise and fall times with changes in compliance and vascular resistance.

© 2014 Optical Society of America

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Optics of Tissue and Turbid Media

Original Manuscript: April 1, 2014
Revised Manuscript: May 23, 2014
Manuscript Accepted: June 16, 2014
Published: June 19, 2014

Tony J. Akl, Mark A. Wilson, M. Nance Ericson, and Gerard L. Coté, "Quantifying tissue mechanical properties using photoplethysmography," Biomed. Opt. Express 5, 2362-2375 (2014)

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