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Proceedings Paper

Laser speckle contrast analysis for pulse waveform extraction
Author(s): Pedro Vaz; Pedro Santos; Edite Figueiras; Carlos Correia; Anne Humeau-Heurtier; João Cardoso
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Paper Abstract

The present paper shows a method for pulse waveform extraction using laser speckle contrast analysis. An experimental apparatus was assembled, using a coherent light source and a digital video camera to record time varying speckle patterns emitted from the radial artery. The speckle data were analysed by computing the speckle pattern contrast on a sequence of video frames. The speckle pulse wave signal was then compared with a photoplethysmographic signal both time and frequency domain. A total of thirty data-sets were acquired from 10 individuals. Subjects heart rate was identified with a root mean square error of 1.3 beats per minute. Signals similarity was evaluated using spectral coherence with an overall mean coherence of 0.63. Speckle contrast analysis is a newly commercialized technique to monitor microvascular blood flow. However, these results demonstrate the ability of the same technique to extract pulse waveform information. The inclusion of this feature in the current speckle devices is only associated with a slightly change in the signal processing techniques and video acquisition parameters but can be very useful in clinical context.

Paper Details

Date Published: 17 July 2015
PDF: 6 pages
Proc. SPIE 9540, Novel Biophotonics Techniques and Applications III, 954007 (17 July 2015); doi: 10.1117/12.2183293
Show Author Affiliations
Pedro Vaz, Univ. of Coimbra (Portugal)
Univ. of Angers (France)
Pedro Santos, Univ. of Coimbra (Portugal)
Edite Figueiras, FinnMedi (Finland)
Carlos Correia, Univ. of Coimbra (Portugal)
Anne Humeau-Heurtier, Univ. of Angers (France)
João Cardoso, Univ. of Coimbra (Portugal)

Published in SPIE Proceedings Vol. 9540:
Novel Biophotonics Techniques and Applications III
Arjen Amelink; I. Alex Vitkin, Editor(s)

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