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Proceedings Paper

Near-infrared muscle oximeter that can correct the influence of a subcutaneous fat layer
Author(s): Katsuyuki Yamamoto; Masatsugu Niwayama; Ling Lin; Toshikazu Shiga; Nobuki Kudo; Makoto Takahashi
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Paper Abstract

The inhomogeneity of tissue structure greatly affects the sensitivity of tissue oxygenation measurement by reflectance NIRS. We have proposed a method for correcting the influence of a subcutaneous fat layer on muscle oxygenation measurement. In this study, this method was validated by measuring the peak-to-peak variation of muscle oxygenation in periodic exercise tests on the vastus lateralis and the falling rate of oxygenation in ischemia tests on the forearm. A newly developed multisensor probe with source- detector distances of 7-40 mm was used. THe probe, consisting of a two-wavelength LED and four photodiodes, was connected to a 4-channel tissue oxygen monitor. The fat layer thickness was also measured by ultrasonography. Results of the tests clearly showed that the presence of a fat layer greatly decreases the sensitivity of measurement and increases the light intensity at a detector. The correction factors of sensitivity were determined from this relationship and Monte Carlo simulation. The corrected oxygenation levels were quantitatively compared among subjects in spite of different fat layer thicknesses.

Paper Details

Date Published: 24 April 1998
PDF: 10 pages
Proc. SPIE 3257, Infrared Spectroscopy: New Tool in Medicine, (24 April 1998); doi: 10.1117/12.306080
Show Author Affiliations
Katsuyuki Yamamoto, Hokkaido Univ. (Japan)
Masatsugu Niwayama, Hokkaido Univ. (Japan)
Ling Lin, Hokkaido Univ. (Japan)
Toshikazu Shiga, Omron Institute of Life Science Co., Ltd. (Japan)
Nobuki Kudo, Hokkaido Univ. (Japan)
Makoto Takahashi, Hokkaido Univ. (United States)

Published in SPIE Proceedings Vol. 3257:
Infrared Spectroscopy: New Tool in Medicine
Henry H. Mantsch; Michael Jackson, Editor(s)

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