Method and apparatus for minimizing spectral interference due to within and between sample variations during in-situ spectral sampling of tissue
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United States of America Patent
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Jan 4, 2005
Grant Date -
Jul 25, 2002
app pub date -
Sep 17, 2001
filing date -
May 2, 2000
priority date (Note) -
Expired
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Abstract
An apparatus and method for reproducibly interfacing a living tissue sample to the measurement probe of a spectrometer instrument in-situ minimizes spectral interference related to sampling variations. A minimal contact subject interface includes supports replaceably mounted on a base. An optical coupling means, such as a fiber optic probe, contacts the measurement site through a probe aperture in the base. During use, a subject rests an extremity on the support elements, so that the extremity is reproducibly positioned and supported in relation to the optical coupling means. The supports have a small contact area, minimizing contact with the skin at the measurement site. The interface module is adjustable to fit any subject. By reproducibly positioning and supporting the body appendage using minimal contact supports, spectral interference due to variations in placement, applied pressure, and temperature transients secondary to contact with the interface module are greatly minimized.
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