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Proceedings Article

Near-infrared muscle oximeter that can correct the influence of a subcutaneous fat layer

[+] Author Affiliations
Katsuyuki Yamamoto, Masatsugu Niwayama, Ling Lin, Nobuki Kudo

Hokkaido Univ. (Japan)

Toshikazu Shiga

Omron Institute of Life Science Co., Ltd. (Japan)

Makoto Takahashi

Hokkaido Univ. (USA)

Proc. SPIE 3257, Infrared Spectroscopy: New Tool in Medicine, 146 (April 24, 1998); doi:10.1117/12.306080
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From Conference Volume 3257

  • Infrared Spectroscopy: New Tool in Medicine
  • Henry H. Mantsch; Michael Jackson
  • San Jose, CA | January 27, 1998

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.

© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Katsuyuki Yamamoto ; Masatsugu Niwayama ; Ling Lin ; Toshikazu Shiga ; Nobuki Kudo, et al.
"Near-infrared muscle oximeter that can correct the influence of a subcutaneous fat layer", Proc. SPIE 3257, Infrared Spectroscopy: New Tool in Medicine, 146 (April 24, 1998); doi:10.1117/12.306080; http://dx.doi.org/10.1117/12.306080


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