18 August 1997 Optical properties of highly scattering media determined from the ratio of changes in attenuation, phase, and modulation depth
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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.
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Matthias Kohl-Bareis, Matthias Kohl-Bareis, Russell W. Watson, Russell W. Watson, Mark Cope, 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); doi: 10.1117/12.280265; https://doi.org/10.1117/12.280265
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