Path constrained spectrophotometer and method for determination of spatial distribution of light or other radiation scattering and absorbing substances in a radiation scattering medium

  • US RE36,044 E
  • Filed: 05/08/1997
  • Issued: 01/12/1999
  • Est. Priority Date: 12/24/1991
  • Status: Expired due to Term
First Claim
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1. A spectrophotometer for providing an image of a radiation scattering medium having one or more radiation attenuating constituents, comprising:

  • light source means for illuminating said medium from a source location at a time t0 with electromagnetic radiation of at least one wavelength, said electromagnetic radiation propagating through said medium over a plurality of paths;

    means for detecting, during a set of detection windows commencing at selected times relative to time t0, portions of said electromagnetic radiation emerging from said medium at a first detection location after having propagated through said medium from said source location to said first detection location over a corresponding set of paths of selected length;

    intensity measuring means for measuring intensity of each of said detected portions of electromagnetic radiation during said detection windows wherein said measured intensities are a function of attenuation of said region; and

    means for generating said image based upon said intensities measured during each of said detection windows and upon corresponding ones of said paths of selected length.

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