Optical system for measuring metabolism in a body and imaging me

Details Optical system for measuring metabolism in a body and imaging me Optical system for measuring metabolism in a body and imaging me

1995-10-06

1998-09-08

Bahr, Jennifer

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600473, 600476, A61B 500

Patent

active

058039090

ABSTRACT:
Light rays of a plurality of wavelengths which are modulated in intensity with a plurality of different frequencies are irradiated on a plurality of irradiation positions on the surface of a living body, and time-variable changes in living body transmitting light intensity levels corresponding to the respective wavelengths and the respective irradiation positions are measured at different positions on the surface Changes in concentration values of absorbers are determined from the living body transmitting light intensity levels and a measuring point is set on a perpendicular extending through an intermediate point between the incident point and each detection point to image a function of the living body. The measuring time is shortened by estimating fluctuation attributable to the living body, and a local change in hemodynamic movement can be measured by detecting light rays transmitting through the interior of the living body by light detection at two different sites (equidistant from the light incident point) on a subject and by separating only the local change in hemodynamic movement from an overall change in hemodynamic movement in the living body in accordance with a logarithmic difference between the two detection signals.

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