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Pathlength corrected oximeter and the like

  • US 20030023140A1
  • Filed: 06/18/2002
  • Published: 01/30/2003
  • Est. Priority Date: 02/06/1989
  • Status: Abandoned Application
First Claim
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1. A spectrophotometer for tissue examination utilizing a measured average pathlength of migrating photons, comprising:

  • an oscillator adapted to generate a carrier waveform of a selected frequency comparable to an average migration time of photons scattered in tissue on paths from an optical input port to an optical detection port;

    a light source, operatively connected to said oscillator, adapted to generate light of a selected wavelength that is intensity modulated at said frequency, said light being introduced to a subject at said input port;

    a photodiode detector adapted to detect, at said detection port, light of said wavelength that has migrated in said tissue of the subject between said input and detection ports;

    a phase detector, operatively connected to receive signals from said oscillator and said diode detector, adapted to measure a phase shift between said introduced and said detected light;

    a processor adapted to determine said pathlength based on said phase shift; and

    said processor further adapted to determine a physiological property of the examined tissue based on said pathlength.

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