Clinical measurements of tissue optical properties in the esophagus

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Abstract
A noninvasive probe has been devised and clinically used to perform in vivo measurements of the optical properties of the esophageal wall. The absorption coefficient and the effective scattering coefficient are determined from the observation of the spatial distribution of the diffuse reflectance at the tissue surface. Results, obtained at 514 and 630 nm, i.e. wavelengths of interest in photodynamic therapy with actual clinically used photosensitizers are summarized. An efficient and easily-built isotropic microprobe is also presented which is suitable to measure in situ the radiant energy fluence rate distribution in tissue.

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