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

Oliver B. Thompson; Michael K. Andrews

doi:10.1117/1.3400721

1 March 2010 Tissue perfusion measurements: multiple-exposure laser speckle analysis generates laser Doppler-like spectra

Oliver B. Thompson, Michael K. Andrews

Author Affiliations +

Journal of Biomedical Optics, Vol. 15, Issue 2, 027015 (March 2010). https://doi.org/10.1117/1.3400721

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.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Oliver B. Thompson and Michael K. Andrews "Tissue perfusion measurements: multiple-exposure laser speckle analysis generates laser Doppler-like spectra," Journal of Biomedical Optics 15(2), 027015 (1 March 2010). https://doi.org/10.1117/1.3400721

Published: 1 March 2010

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