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Journal of Biomedical Optics

Gas monitoring in human sinuses using tunable diode laser spectroscopy
Author(s): Linda Persson; Mats Andersson; Marta Cassel-Engquist; Katarina Svanberg; Sune Svanberg
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Paper Abstract

We demonstrate a novel nonintrusive technique based on tunable diode laser absorption spectroscopy to investigate human sinuses in vivo. The technique relies on the fact that free gases have spectral imprints that are about 10.000 times sharper than spectral structures of the surrounding tissue. Two gases are detected; molecular oxygen at 760 nm and water vapor at 935 nm. Light is launched fiber optically into the tissue in close proximity to the particular maxillary sinus under study. When investigating the frontal sinuses, the fiber is positioned onto the caudal part of the frontal bone. Multiply scattered light in both cases is detected externally by a handheld probe. Molecular oxygen is detected in the maxillary sinuses on 11 volunteers, of which one had constantly recurring sinus problems. Significant oxygen absorption imprint differences can be observed between different volunteers and also left-right asymmetries. Water vapor can also be detected, and by normalizing the oxygen signal on the water vapor signal, the sinus oxygen concentration can be assessed. Gas exchange between the sinuses and the nasal cavity is also successfully demonstrated by flushing nitrogen through the nostril. Advantages over current ventilation assessment methods using ionizing radiation are pointed out.

Paper Details

Date Published: 1 September 2007
PDF: 8 pages
J. Biomed. Opt. 12(5) 054001 doi: 10.1117/1.2777189
Published in: Journal of Biomedical Optics Volume 12, Issue 5
Show Author Affiliations
Linda Persson, Lunds Univ. (Sweden)
Mats Andersson, Lunds Univ. (Sweden)
Marta Cassel-Engquist, Lunds Univ. (Sweden)
Katarina Svanberg, Lund Univ. Hospital (Sweden)
Sune Svanberg, Lunds Tekniska Högskola (Sweden)

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