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Proceedings Paper

Characterizing tissue optical properties using confocal and low-coherence imaging
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Paper Abstract

The signal from a confocal measurement as the focal volume is scanned down into a tissue yields an exponential decay versus depth (z_focus), signal = rho exp(-mu z_focus), where rho [dimensionless] is the local reflectivity and mu [1/cm] is an attenuation coefficient. A simple theory for how rho and mu depend on the optical properties of scattering (mu_s) and anisotropy (g) is presented. Experimental measurements on 5 tissue types from mice (white and gray matter of brain, skin, liver, muscle) as well as 0.1-um-dia. polystyrene microspheres are presented. The tissues have similar mu_s values (about 500 [1/cm]) but variable g values (0.8-0.99). Anisotropy appears to be the primary mechanism of contrast for confocal measurements such as reflectance-mode confocal scanning laser microscopy (rCLSM) and optical coherence tomography (OCT). While fluorescence imaging depends on fluorophores, and absorption imaging depends on chromophores, the results of this study suggest that contrast of confocal imaging of biological tissues depends primarily on anisotropy.

Paper Details

Date Published: 1 March 2006
PDF: 5 pages
Proc. SPIE 6084, Optical Interactions with Tissue and Cells XVII, 60840L (1 March 2006); doi: 10.1117/12.660050
Show Author Affiliations
Steven L. Jacques, Oregon Health & Science Univ. (United States)
Daniel S. Gareau, Oregon Health & Science Univ. (United States)

Published in SPIE Proceedings Vol. 6084:
Optical Interactions with Tissue and Cells XVII
Steven L. Jacques; William P. Roach, Editor(s)

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