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Mapping of Optical Pathlength of Human Adult Head at Multi-Wavelengths in Near Infrared Spectroscopy

  • Akihisa Katagiri
  • Ippeita Dan
  • Daisuke Tuzuki
  • Masako Okamoto
  • Noriaki Yokose
  • Kouji Igarashi
  • Tatsuya Hoshino
  • Tokuo Fujiwara
  • Youichi Katayama
  • Yui Yamaguchi
  • Kaoru SakataniEmail author
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 662)

Abstract

Measurement of multichannel continuous-wave near-infrared spectroscopy (CW-NIRS) is dependent on the modified Beer-Lambert law, which includes optical pathlength (PL) as an essential parameter. PLs are known to differ across different head regions and different individuals, but the distribution of PLs for the whole head has not been evaluated so far. Thus, using time-resolved near-infrared spectroscopy (TR-NIRS), we measured the optical characteristics including PL, scattering coefficients (μ′s), and absorption coefficients (μa) at three wavelengths (760, 800, 830 nm). Then, we constructed maps of these parameters on the subjects’ head surface. While the PLs in nearby channels are similar, they differ depending on the regions of the head. The PLs in the region above the Sylvian fissure tended to be shorter than those in the other regions at all of the wavelengths. The difference in the distribution of PLs may be attributed to differences in tissue absorption and scattering properties. The current study suggests the importance of considering PL differences in interpreting functional data obtained by CW-NIRS.

Keywords

Occipital Region Hamamatsu Photonic Central Sulcus Language Dominance Optical Pathlength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was in part supported by Hamamatsu Photonics K.K. (Hamamatsu, Japan), the Program for Promotion of Basic Research Activities for Innovative Bioscience, Health and Labor Sciences Research Grants, Research on Psychiatric and Neurological Diseases and Mental Health, and grant-in-aids from the Ministry of Education, Culture, Sport, Science, and Technology, Japan (18700625 awarded to MO and 18390404 to ID).We thank Dr. Lester Clowney for proofreading the manuscript.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Akihisa Katagiri
    • 1
  • Ippeita Dan
    • 2
  • Daisuke Tuzuki
    • 2
  • Masako Okamoto
    • 2
  • Noriaki Yokose
    • 1
  • Kouji Igarashi
    • 1
  • Tatsuya Hoshino
    • 1
  • Tokuo Fujiwara
    • 1
  • Youichi Katayama
    • 3
  • Yui Yamaguchi
    • 2
  • Kaoru Sakatani
    • 3
    Email author
  1. 1.Division of Neurological Surgery, Department of Neurological SurgeryNihon University School of MedicineTokyoJapan
  2. 2.National Food Research InstituteTsukubaJapan
  3. 3.Division of Optical Brain Engineering, Department of Neurological Surgery; Division of Applied System Neuroscience, Department of Advanced Medical ScienceNihon University School of MedicineTokyoJapan

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