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Microelectrode array electrical impedance tomography for fast functional imaging in the thalamus.

Danyi Zhu1, Alistair McEwan1, Calvin Eiber2

  • 1School of Electrical and Information Engineering, The University of Sydney, Camperdown, NSW, Australia.

Neuroimage
|May 21, 2019
PubMed
Summary

Electrical Impedance Tomography (EIT) can image neural activity in the brain. Microelectrode array EIT shows potential for mapping subcortical brain activity with high precision.

Keywords:
Brain imagingConductivityDepth electrodesEITModellingVisual thalamus

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) offers millisecond-timescale functional brain imaging.
  • Previous studies demonstrated EIT's ability to image neural depolarization in rat brains.

Purpose of the Study:

  • To investigate the feasibility of using microelectrode array EIT for imaging impedance changes in the thalamus.
  • To simulate and validate microelectrode array EIT using an anatomically accurate marmoset brain model.

Main Methods:

  • Simulations were performed using an anatomically accurate marmoset brain model.
  • Physiological noise from the marmoset visual thalamus was used to validate impedance imaging and estimate detectability.

Main Results:

  • Visual-input-driven impedance changes in subcortical bodies within 300 μm of the array were reliably reconstructed and localized.
  • Microelectrode array EIT demonstrated comparable results to local field potential measurements.
  • Concurrent activity in multiple subcortical bodies was successfully reconstructed.

Conclusions:

  • Microelectrode array EIT is a feasible technique for imaging subcortical brain activity.
  • This method provides high spatial and temporal resolution for functional neuroimaging.
  • EIT holds promise for simultaneous monitoring of multiple brain regions.