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Journal of Biomedical Optics

Noncontact imaging photoplethysmography to effectively access pulse rate variability
Author(s): Yu Sun; Sijung Hu; Vicente Azorin-Peris; Roy Kalawsky; Stephen E. Greenwald
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Paper Abstract

Noncontact imaging photoplethysmography (PPG) can provide physiological assessment at various anatomical locations with no discomfort to the patient. However, most previous imaging PPG (iPPG) systems have been limited by a low sample frequency, which restricts their use clinically, for instance, in the assessment of pulse rate variability (PRV). In the present study, plethysmographic signals are remotely captured via an iPPG system at a rate of 200 fps. The physiological parameters (i.e., heart and respiration rate and PRV) derived from the iPPG datasets yield statistically comparable results to those acquired using a contact PPG sensor, the gold standard. More importantly, we present evidence that the negative influence of initial low sample frequency could be compensated via interpolation to improve the time domain resolution. We thereby provide further strong support for the low-cost webcam-based iPPG technique and, importantly, open up a new avenue for effective noncontact assessment of multiple physiological parameters, with potential applications in the evaluation of cardiac autonomic activity and remote sensing of vital physiological signs.

Paper Details

Date Published: 30 October 2012
PDF: 9 pages
J. Biomed. Opt. 18(6) 061205 doi: 10.1117/1.JBO.18.6.061205
Published in: Journal of Biomedical Optics Volume 18, Issue 6
Show Author Affiliations
Yu Sun, National Univ. of Singapore (Singapore)
Sijung Hu, Loughborough Univ. (United Kingdom)
Vicente Azorin-Peris, Loughborough Univ. (United Kingdom)
Roy Kalawsky, Loughborough Univ. (United Kingdom)
Stephen E. Greenwald, Barts and The London School of Medicine and Dentistry (United Kingdom)

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