University of Utah Research Foundation

Robert W McClane

Werner Gellermann

Paul S Bernstein

Nikita B Katz

A method and apparatus are provided for the determination of levels of carotenoids and similar chemical compounds in biological tissue such as living skin. The method and apparatus provide a noninvasive, rapid, accurate, and safe determination of carotenoid levels which in turn can provide diagnostic information regarding cancer risk, or can be a marker for conditions where carotenoids or other antioxidant compounds may provide diagnostic information. Such early diagnostic information allows for the possibility of preventative intervention. The method and apparatus utilize the technique of resonance Raman spectroscopy to measure the levels of carotenoids and similar substances in tissue. In this technique, laser light is directed upon the area of tissue which is of interest. A small fraction of the scattered light is scattered inelastically, producing the carotenoid Raman signal which is at a different frequency than the incident laser light, and the Raman signal is collected, filtered, and measured. The resulting Raman signal can be analyzed such that the background fluorescence signal is subtracted and the results displayed and compared with known calibration standards.

Method and apparatus for noninvasive measurement of carotenoids and related chemical substances in biological tissue

The present invention is directed to a new and useful method and apparatus for use in determining the levels of macular pigments in the tissue of live subjects. Specifically, the method and apparatus of the present invention provide a non-invasive, rapid, and objective determination of the macular carotenoid levels, and in turn, offer valuable diagnostic information applicable to large populations. The present invention measures the levels of macular carotenoid pigments, as well as other retinal materials. Monochromatic laser light is projected onto a retina, preferably in the macular area. A very sensitive detection system then detects light scattered from the retina. The majority of the light is scattered elastically at the same wavelength of the laser in a manner known as Rayleigh scattering. A very small fraction of laser light is scattered inclastically at a wavelength different from that of the laser in a manner known as Raman scattering. The Raman scattered light is selected and then routed to a detection system, wherein the results are calibrated against actual standards for the particular retinal material being tested.

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Salt Lake City, UT, United States of America

Robert W McClane