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Journal of Biomedical Optics

Removal of the skin blood flow artifact in functional near-infrared spectroscopic imaging data through independent component analysis
Author(s): Satoru Kohno; Ichiro Miyai; Akitoshi Seiyama; Ichiro Oda; Akihiro Ishikawa; Shoichi Tsuneishi; Takahi Amita; Koji Shimizu
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Paper Abstract

We investigate whether the functional near-infrared spectroscopic (fNIRS) signal includes a signal from the changing skin blood flow. During a locomotor task on a treadmill, changes in the hemodynamic response in the front-parietal area of healthy human subjects are simultaneously recorded using an fNIRS imaging system and a laser Doppler tissue blood flow meter. Independent component analysis (ICA) for fNIRS signals is performed. The skin blood flow changes during locomotor tasks on a treadmill. The activated spatial distribution of one of the components separated by ICA reveals an overall increase in fNIRS channels. To evaluate the uniformity of the activated spatial distribution, we define a new statistical value—the coefficient of spatial uniformity (CSU). The CSU value is a highly discriminating value (e.g., 2.82) compared with values of other components (e.g., 1.41, 1.10, 0.96, 0.61, and 0.58). In addition, the independent component signal corresponding to the activated spatial distribution is similar to changes in skin blood flow measured with the laser Doppler tissue blood flow meter. The coefficient of correlation indicates strong correlation. Localized activation areas around the premotor and medial somatosensory cortices are shown more clearly by eliminating the extracted component.

Paper Details

Date Published: 1 November 2007
PDF: 9 pages
J. Biomed. Opt. 12(6) 062111 doi: 10.1117/1.2814249
Published in: Journal of Biomedical Optics Volume 12, Issue 6
Show Author Affiliations
Satoru Kohno, Shimadzu Corp. (Japan)
Ichiro Miyai
Akitoshi Seiyama, Osaka Univ. (Japan)
Ichiro Oda, Shimadzu Corp. (Japan)
Akihiro Ishikawa, Shimadzu Corp. (Japan)
Shoichi Tsuneishi, Shimadzu Corp. (Japan)
Takahi Amita, Shimadzu Corp. (Japan)
Koji Shimizu, Shimadzu Corp. (Japan)

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