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Proceedings Paper

Studies of blood gas determination and intelligent image
Author(s): Chih-Cheng Wang; Xiaogang Jin
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Paper Abstract

In recent years, progress has been made in understanding the theory of laser absorption and emission. In addition, advancements of electronic components and fiber optics permitted construction of useful medical instruments. Such a fiber optic sensor (FOS) has been developed at the authors' institution. The technique is a method of major importance in the areas of geochemistry, biomedical engineering, and blood gas analysis. According to the type of variable to be measured, two wide classes can be defined; Biomedical (for oxygen saturation, pH, pO2, and pCO2 measurement) and physical (for pressure, temperature, and blood velocity). In general, biomedical sensors use an appropriate reversible reagent fixed at a fiber end, allowing spectrophotometric or fluorimetric analysis by modulation. Sensors for measuring blood velocity and flow are mainly applied in the cardiovascular clinic and in pathophysiology. Velocity in vessels can be measured using the laser Doppler method based on the frequency shift of light scattered by the moving red cells (erythrocytes, diameter 7/micrometers ). The Doppler-shifted backscattered light is partially collected by the same fiber tip end transmitted back to its entrance. There was shown to be a highly sensitive and linear relationship between the results obtained with this method and the blood gas analyzer.

Paper Details

Date Published: 16 April 1992
PDF: 4 pages
Proc. SPIE 1648, Fiber Optic Medical and Fluorescent Sensors and Applications, (16 April 1992); doi: 10.1117/12.58295
Show Author Affiliations
Chih-Cheng Wang, Wuhan Tongji Medical Univ. (China)
Xiaogang Jin, Wuhan Univ. of Hydraulic and Electric Engineering (China)

Published in SPIE Proceedings Vol. 1648:
Fiber Optic Medical and Fluorescent Sensors and Applications
Douglas R. Hansmann; Fred P. Milanovich; Gerald G. Vurek; David R. Walt, Editor(s)

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