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ID 114231
Author
Kohno, Satoru Tokushima University|Tokyo Metropolitan Institute of Medical Science Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Hoshi, Yoko Tokyo Metropolitan Institute of Medical Science|Hamamatsu University School of Medicine
Keywords
functional near-infrared spectroscopy
verbal-fluency task
superficial signals
blood flow
supraorbital
cluster analysis
Content Type
Journal Article
Description
Functional near-infrared spectroscopy (fNIRS) signals originate in hemoglobin changes in both the superficial layer of the head and the brain. Under the assumption that the changes in the blood flow in the scalp are spatially homogeneous in the region of interest, a variety of methods for reducing the superficial signals has been proposed. To clarify the spatial distributions of the superficial signals, the superficial signals from the forehead during a verbal-fluency task were investigated by using ten source–detector pairs separated by 5 mm, whereas fNIRS signals were also detected from two source–detector pairs separated by 30 mm. The fNIRS signals strongly correlated with the superficial signals at some channels on the forehead. Hierarchical cluster analysis was performed on the temporal cross-correlation coefficients for two channels of both the NIRS signals, and the analysis results demonstrate spatially heterogeneous distributions and network structures of the superficial signals from within the forehead. The results also show that the assumption stated above is invalid for homogeneous superficial signals from any region of interest of 15-mm diameter or larger on the forehead. They also suggest that the spatially heterogeneous distributions may be attributable to vascular networks, including supraorbital, supratrochlear, and superficial temporal vessels.
Journal Title
Journal of Biomedical Optics
ISSN
10833668
15602281
NCID
AA11237889
AA11953151
Publisher
SPIE
Volume
21
Issue
6
Start Page
066009
Published Date
2016-06-14
Remark
Satoru Kohno, Yoko Hoshi, “Spatial distributions of hemoglobin signals from superficial layers in the forehead during a verbal-fluency task,” J. of Biomedical Optics, 21(6), 066009 (2016). DOI: http://dx.doi.org/10.1117/1.JBO.21.6.066009
Rights
©2016 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
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language
eng
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departments
Medical Sciences