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Bundled-Optode Method in Functional Near-Infrared Spectroscopy

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  • Hoang-Dung Nguyen
  • Keum-Shik Hong
  • Yong-Il Shin

Abstract

In this paper, a theory for detection of the absolute concentrations of oxy-hemoglobin (HbO) and deoxy-hemoglobin (HbR) from hemodynamic responses using a bundled-optode configuration in functional near-infrared spectroscopy (fNIRS) is proposed. The proposed method is then applied to the identification of two fingers (i.e., little and thumb) during their flexion and extension. This experiment involves a continuous-wave-type dual-wavelength (760 and 830 nm) fNIRS and five healthy male subjects. The active brain locations of two finger movements are identified based on the analysis of the t- and p-values of the averaged HbOs, which are quite distinctive. Our experimental results, furthermore, revealed that the hemodynamic responses of two-finger movements are different: The mean, peak, and time-to-peak of little finger movements are higher than those of thumb movements. It is noteworthy that the developed method can be extended to 3-dimensional fNIRS imaging.

Suggested Citation

  • Hoang-Dung Nguyen & Keum-Shik Hong & Yong-Il Shin, 2016. "Bundled-Optode Method in Functional Near-Infrared Spectroscopy," PLOS ONE, Public Library of Science, vol. 11(10), pages 1-23, October.
    • Handle: RePEc:plo:pone00:0165146
    DOI: 10.1371/journal.pone.0165146
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    References listed on IDEAS

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    1. Florian B Haeussinger & Sebastian Heinzel & Tim Hahn & Martin Schecklmann & Ann-Christine Ehlis & Andreas J Fallgatter, 2011. "Simulation of Near-Infrared Light Absorption Considering Individual Head and Prefrontal Cortex Anatomy: Implications for Optical Neuroimaging," PLOS ONE, Public Library of Science, vol. 6(10), pages 1-12, October.
    2. Marijke Welvaert & Yves Rosseel, 2013. "On the Definition of Signal-To-Noise Ratio and Contrast-To-Noise Ratio for fMRI Data," PLOS ONE, Public Library of Science, vol. 8(11), pages 1-10, November.
    3. Gary E Strangman & Zhi Li & Quan Zhang, 2013. "Depth Sensitivity and Source-Detector Separations for Near Infrared Spectroscopy Based on the Colin27 Brain Template," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-13, August.
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