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Conducting Hyperscanning Experiments with Functional Near-Infrared Spectroscopy
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Photogrammetry-based stereoscopic optode registration method for functional near-infrared spectroscopy.

Xiao-Su Hu1, Neelima Wagley1, Akemi Tsutsumi Rioboo1

  • 1Univ. of Michigan, United States.

Journal of Biomedical Optics
|September 4, 2020
PubMed
Summary

A new photogrammetry optode registration (POR) method offers accessible neuroanatomical registration for functional near-infrared spectroscopy (fNIRS) brain imaging. This photo-based approach provides reliable data alignment for fNIRS and other surface-based neuroimaging techniques.

Keywords:
functional near-infrared spectroscopymagnetic resonance imagingoptode/probe registrationphotogrammetry

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Area of Science:

  • Neuroimaging
  • Brain Imaging Techniques
  • Biomedical Engineering

Background:

  • Functional near-infrared spectroscopy (fNIRS) is a portable, low-cost brain imaging method.
  • fNIRS lacks inherent neuroanatomical information, posing interpretation challenges.
  • Current registration methods like MRI and 3-D digitization have limitations in cost, accessibility, or accuracy.

Purpose of the Study:

  • To develop and evaluate a novel photogrammetry optode registration (POR) method for fNIRS.
  • To provide an accessible and reliable solution for aligning fNIRS data with neuroanatomy.

Main Methods:

  • The POR method utilizes a consumer-grade camera and structure from motion (SfM) algorithms to create a 3-D reconstruction of fNIRS optodes on the head.
  • Approximately 100-150 digital photographs are used for the 3-D reconstruction.
  • The reconstructed optode positions are then aligned with a standard brain anatomical template.

Main Results:

  • Validation studies in 22 adults and 19 children compared POR with MRI-based registration.
  • Average overlap between POR and MRI registration was 55% in adults and 46% in children.
  • Frontal channel registration showed higher overlap, reaching 65% in adults and 60% in children.

Conclusions:

  • The POR method demonstrates potential as an accessible and reliable tool for fNIRS neuroanatomical registration.
  • Observed registration discrepancies may stem from optode placement variability rather than the POR method's efficacy.
  • This photo-based approach is applicable to other surface-based neuroimaging and neuromodulation techniques.