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Proceedings Paper

Optical noninvasive calculation of hemoglobin components concentrations and fractional oxygen saturation using a ring-scattering pulse oximeter
Author(s): Omar Abdallah; Wilhelm Stork; Klaus Muller-Glaser
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Paper Abstract

The deficiencies of the currently used pulse oximeter are discussed in diverse literature. A hazardous pitfalls of this method is that the pulse oximeter will not detect carboxyhemoglobin (COHb) and methemoglobin (metHb) concentrations. This leads to incorrect measurement of oxygen saturation by carbon monoxide poisoning and methemoglobinemia. Also the total hemoglobin concentration will not be considered and can only be measured in-vitro up to now. A second pitfall of the standard pulse oximetry is that it will not be able to show a result by low perfusion of tissues. This case is available inter alia when the patient is under shock or has a low blood pressure. The new non-invasive system we designed measures the actual (fractional) oxygen saturation and hemoglobin concentration. It will enable us also to measure COHb and metHb. The measurement can be applied at better perfused body central parts. Four or more light emitting diodes (LEDs) or laser diodes (LDs) and five photodiodes (PDs) are used. The reflected light signal detected by photodiodes is processed using a modified Lambert-Beer law (I=I0•e-α.d ). According to this law, when a non scattering probe is irradiated with light having the incident intensity I0, the intensity of transmitted light I decays exponentially with the absorption coefficient a of that probe and its thickness d. Modifications of this law have been performed following the theoretical developed models in literature, Monte Carlo simulation and experimental measurement.

Paper Details

Date Published: 18 June 2004
PDF: 11 pages
Proc. SPIE 5325, Optical Diagnostics and Sensing IV, (18 June 2004); doi: 10.1117/12.529430
Show Author Affiliations
Omar Abdallah, FZI Forschungszentrum Informatik (Germany)
Univ. Karlsruhe (Germany)
Wilhelm Stork, FZI Forschungszentrum Informatik (Germany)
Univ. Karlsruhe (Germany)
Klaus Muller-Glaser, Univ. Karlsruhe (Germany)


Published in SPIE Proceedings Vol. 5325:
Optical Diagnostics and Sensing IV
Gerard L. Cote; Alexander V. Priezzhev, Editor(s)

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