Optical properties of highly scattering media determined from the ratio of changes in attenuation, phase, and modulation depth

Matthias Kohl-Bareis; Russell W. Watson; Mark Cope

doi:10.1117/12.280265

18 August 1997 Optical properties of highly scattering media determined from the ratio of changes in attenuation, phase, and modulation depth

Matthias Kohl-Bareis, Russell W. Watson, Mark Cope

Author Affiliations +

Proceedings Volume 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II; (1997) https://doi.org/10.1117/12.280265
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

Abstract

The optical properties of scattering media determine the attenuation (A) and the transit time (<t>) of light diffusely reflected from the medium as well as the phase ((Phi) ) and modulation depth (M) of an intensity modulated light wave. Here it is described how the absorption coefficient can be derived from the ratio of changes in A, (Phi) and M. These ratios are approximately independent of the scattering properties. The changes in A, (Phi) and M can be induced either by small changes in the absorption coefficient of the medium or by tuning the wavelength over the absorption spectrum of medium. The application for the in vivo monitoring of haemoglobin and oxyhemoglobin concentrations in human tissue with near infra red light is discussed.

Citation Download Citation

Matthias Kohl-Bareis, Russell W. Watson, and Mark Cope "Optical properties of highly scattering media determined from the ratio of changes in attenuation, phase, and modulation depth", Proc. SPIE 2979, Optical Tomography and Spectroscopy of Tissue: Theory, Instrumentation, Model, and Human Studies II, (18 August 1997); https://doi.org/10.1117/12.280265

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