Patent ID: 6741876
Filing Date: 2004-05-25
Classification: A61B

Abstract:
A method for determining a concentration of a constituent in a tissue of a subject comprising the steps of:irradiating the tissue with a broad spectrum of radiation in the AV and NIR region from a first source of radiation; irradiating the tissue with radiation in the longer wavelength NIR region from a second source of radiation; measuring with a detector transmitted or radiation from the tissue at a continuum of wavelengths in the AV and NIR region and at one, or more than one discrete wavelength in the longer wavelength NIR region, wherein the continuum of wavelengths in the AV and NIR region is between 500 and 1100 nm, and wherein the one, or more than one discrete wavelength is between 1590 and 1700 nm; and calculating the concentration of the constituent on the basis of the measurements, thereby determining the concentration of the constituent in the tissue, wherein said first and second sources are approximately oppositely disposed to said detector.