Examination apparatus for measuring oxygenation in body organs

Details Examination apparatus for measuring oxygenation in body organs Examination apparatus for measuring oxygenation in body organs

1988-05-02

1990-03-13

McGraw, Vincent P.

Optics: measuring and testing

Blood analysis

Hemoglobin concentration

128633, G01N 3349, A61B 500

Patent

active

049078763

ABSTRACT:
An examination apparatus which measures the oxygenation in objects with near infrared light transmission spectrophotometry and that automatically adjusts a transmission light quantity to a magnitude suitable for detection by a photomultiplier tube. The examination apparatus comprises a ring-like ND filter whose transmission factor varies along its circumference, a filter driver for automatically setting a transmission factor of a filter, and a light source control device for automatically controlling output powers of light sources.

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Tamura, M. et al., "Measurement of Living Body Near Infrared Light Spectrophotometry", Near-Infrared Tissue Spectroscopy, vol. 23, No. 4, pp. 377-385, 1986 (In Japanese).
Wyatt, J. S. et al., "Quantification of Cerebral Oxygenation and Haemodynamics in Sick Newborn Infants by Near Infrared Spectrophotometry", The Lancet, pp. 1063-1066, Nov. 8, 1986.
Komarov, L. I. et al, "Recording Variable Radiation by Discrete-Photon Counting Method", Journal of Applied Spectroscopy, vol. 18, No. 3, pp. 349-353, Jan. 1975.
Hosu, K. K. et al., "Optimum Wavelength Selection System for Component Analyzer", Patent Abstracts of Japan, vol. 11, No. 79, Mar. 11, 1987.

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