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Proceedings Paper

Development of noise-immune oximetry: theory and measurement
Author(s): Gonzalo Paez; Camille Vazquez-Jaccaud; Marija Strojnik
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Paper Abstract

We examine the feasibility of applying oximetry for the assessment of the degree of brain activity. Changes in concentration of oxygenated and deoxygenated hemoglobin may be used to determine the activity levels through differential attenuation in red and infrared (IR) spectral lines. We extend the classical mathematical model for oxygen saturation to include multiplicative and additive noises, signal gain, and detector responsivity. We perform temporal correlation between two signals (red and IR) to increase immunity to noise. This is particularly important when we consider dynamic biological processes and that the movement is always present. In the literature the difficulty of movement (differences in optical paths) is resolved with electronic solutions. We improve the effect of time displacement between signals at the level of equations. The considerations of noise in the saturation expression are significant when the signal levels approach zero.

Paper Details

Date Published: 7 September 2006
PDF: 9 pages
Proc. SPIE 6307, Unconventional Imaging II, 63070F (7 September 2006); doi: 10.1117/12.674923
Show Author Affiliations
Gonzalo Paez, Ctr. de Investigaciones en Óptica (Mexico)
Camille Vazquez-Jaccaud, Ctr. de Investigaciones en Óptica (Mexico)
Marija Strojnik, Ctr. de Investigaciones en Óptica (Mexico)

Published in SPIE Proceedings Vol. 6307:
Unconventional Imaging II
Victor L. Gamiz; Paul S. Idell; Marija S. Strojnik, Editor(s)

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