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Apparatus for measuring absorption information in scattering medium and method therefor

  • US 5,441,054 A
  • Filed: 07/19/1993
  • Issued: 08/15/1995
  • Est. Priority Date: 07/20/1992
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring absorption information in a scattering medium, comprisinglight-emitting means for emitting modulated light having a predetermined wavelength,light-incident means for forming the modulated light having the predetermined wavelength into a spot and causing the spot to be incident on the scattering medium,photodetecting means for photodetecting the modulated light, changed during propagation in the scattering medium, through an opening located near an outer surface of the scattering medium,signal extracting means for extracting a signal of one predetermined frequency component constituting the modulated light from signals photodetected by said photodetecting means,parameter detecting means for comparing the signal extracted by the signal extracting means with the signal of the predetermined frequency component of the modulated light to be incident on the scattering medium and detecting a predetermined parameter associated with propagation of a photon density wave having the predetermined frequency component in the scattering medium and absorption of the light of the predetermined wavelength constituting the photon density wave having the predetermined frequency component,first arithmetic processing means for calculating first absorption information associated with an absorptive constituent in the scattering medium, utilizing a relationship between the predetermined parameter and an absorption coefficient obtained when the photon density wave having the predetermined frequency component propagates in the scattering medium, andsecond arithmetic processing means for calculating second absorption information associated with the absorption coefficient in the scattering medium, on the basis of a plurality of first absorption information obtained by the first arithmetic processing means.

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