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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 9, Iss. 4 — Apr. 1, 2014

Simple correction factor for laser speckle imaging of flow dynamics

J. C. Ramirez-San-Juan, R. Ramos-Garcia, G. Martinez-Niconoff, and B. Choi  »View Author Affiliations

Optics Letters, Vol. 39, Issue 3, pp. 678-681 (2014)

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One of the major constraints facing laser speckle imaging for blood-flow measurement is reliable measurement of the correlation time (τC) of the back-scattered light and, hence, the blood’s speed in blood vessels. In this Letter, we present a new model expression for integrated speckle contrast, which accounts not only for temporal integration but spatial integration, too, due to the finite size of the pixel of the CCD camera; as a result, we find that a correction factor should be introduced to the measured speckle contrast to properly determine τC; otherwise, the measured blood’s speed is overestimated. Experimental results support our theoretical model.

© 2014 Optical Society of America

OCIS Codes
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(170.3880) Medical optics and biotechnology : Medical and biological imaging

ToC Category:
Imaging Systems

Original Manuscript: November 6, 2013
Revised Manuscript: December 20, 2013
Manuscript Accepted: December 23, 2013
Published: January 30, 2014

Virtual Issues
Vol. 9, Iss. 4 Virtual Journal for Biomedical Optics

J. C. Ramirez-San-Juan, R. Ramos-Garcia, G. Martinez-Niconoff, and B. Choi, "Simple correction factor for laser speckle imaging of flow dynamics," Opt. Lett. 39, 678-681 (2014)

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