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Journal of Biomedical Optics • Open Access

Tissue perfusion measurements: multiple-exposure laser speckle analysis generates laser Doppler-like spectra

Paper Abstract

Variations in skin perfusion are easily detected by laser speckle contrast maps, but a robust interpretation of the information has been lacking. We show that multiple-exposure laser speckle methods produce the same spectral information as laser Doppler methods when applied to targets with embedded moving scatterers. This enables laser speckle measurements to be interpreted more quantitatively. We do this by using computer simulation of speckle data, and by experimental measurements on Brownian motion and skin perfusion using a laser Doppler system and a multiple-exposure laser speckle system. The power spectral density measurements of the light fluctuations derived using both techniques are exactly equivalent. Dermal perfusion can therefore be measured by laser Doppler or laser speckle contrast methods. In particular, multiexposure laser speckle can be rapidly processed to generate a full-field map of the perfusion index proportional to the concentration and mean velocity of red blood cells.

Paper Details

Date Published: 1 March 2010
PDF: 7 pages
J. Biomed. Opt. 15(2) 027015 doi: 10.1117/1.3400721
Published in: Journal of Biomedical Optics Volume 15, Issue 2
Show Author Affiliations
Oliver B. Thompson, Industrial Research Ltd. (New Zealand)
Michael K. Andrews, Industrial Research Ltd. (New Zealand)

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