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Journal of Biomedical Optics

Capillary blood flow monitoring using laser speckle contrast analysis (LASCA)
Author(s): J. David Briers; Glenn J. Richards; Xiao-Wei He
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Paper Abstract

Coherent light scattered from an ensemble of moving scatterers produces a time-varying speckle pattern. The intensity fluctuations observed in a single speckle can be regarded either as a time-varying interference effect or as a Doppler beating effect. Techniques based on each of these approaches have been developed to analyze the fluctuations in an attempt to measure the velocities of the scatterers. Most of these methods measure the temporal statistics of the intensity fluctuations in a single speckle, i.e., at a single point. If a map of the velocity distribution is required, some form of scanning must be introduced. One way of avoiding the need to scan is to make use of the spatial statistics of time-integrated speckle. This is the basis of a technique, already described in the literature, called laser speckle contrast analysis (LASCA). In this article, we present a brief review of the theory linking the intensity fluctuations to the velocity and of the various techniques that have been proposed to measure them. We then describe the present configuration of our LASCA technique and describe some recent developments in our search for a real-time, noninvasive, full-field technique for visualizing capillary blood flow.

Paper Details

Date Published: 1 January 1999
PDF: 12 pages
J. Biomed. Opt. 4(1) doi: 10.1117/1.429903
Published in: Journal of Biomedical Optics Volume 4, Issue 1
Show Author Affiliations
J. David Briers, Kingston Univ. (United Kingdom)
Glenn J. Richards, Kingston Univ. (United Kingdom)
Xiao-Wei He, Kingston Univ. (United Kingdom)

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