Title:
【発明の名称】経路長補正式酸素計等
Document Type and Number:
Japanese Patent JPH08509880
Kind Code:
A
Abstract:
A pathlength corrected spectrophotometer for tissue examination includes an oscillator for generating a carrier waveform of a selected frequency, an LED light source for generating light of a selected wavelength that is intensity modulated at the selected frequency introduced to a subject, and a photodiode detector for detecting light that has migrated in the tissue of the subject. The spectrophotometer also includes a phase detector for measuring a phase shift between the introduced and detected light, a magnitude detector for determination of light attenuation in the examined tissue, and a processor adapted to calculate the photon migration pathlength and determine a physiological property of the examined tissue based on the pathlength and on the attenuation data.
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Inventors:
Chance, briton
Application Number:
JP52116894A
Publication Date:
October 22, 1996
Filing Date:
March 15, 1994
Export Citation:
Assignee:
Non-Invasive Technology, Inc.
International Classes:
A61B5/145; A61B5/00; A61B5/1455; A61B5/1495; A61B10/00; G01N21/27; G01N21/31; G01N21/47; G01N21/49; G01N21/64; (IPC1-7): A61B5/14; G01N21/27
Attorney, Agent or Firm:
Masao Okabe (10 outside)