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Related Experiment Videos

A method for removing imaging artifact from continuous EEG recorded during functional MRI.

P J Allen1, O Josephs, R Turner

  • 1Department of Clinical Neurophysiology, National Hospital for Neurology and Neurosurgery, University College London Hospitals, Queen Square, London, WC1N 3BG, United Kingdom.

Neuroimage
|July 29, 2000
PubMed
Summary

Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) is now possible. A new recording system and artifact reduction method effectively remove fMRI interference, enabling advanced neuroimaging studies.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Combined EEG/fMRI is valuable for localizing brain activity and identifying cognitive states.
  • Significant artifacts from fMRI severely limit simultaneous EEG/fMRI recording capabilities.
  • Existing artifact removal methods are insufficient due to artifact magnitude and frequency overlap.

Purpose of the Study:

  • To develop and validate a novel recording system and artifact reduction technique for simultaneous EEG/fMRI.
  • To overcome the limitations imposed by fMRI-induced artifacts on EEG data quality.

Main Methods:

  • A high-dynamic-range recording system with 5-kHz sampling and low-pass filtering was employed.
  • Artifact reduction involved subtracting averaged artifact waveforms and adaptive noise cancellation.

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  • The system and method were validated in five subjects using various fMRI sequences.

    • Main Results:

    • The developed method effectively reduced fMRI artifacts, with minimal distortion to EEG signals (10-18% spectral difference).
    • Detection of simulated spike waves improved from 12% (uncorrected) to 99% (corrected).
    • Median noise level after artifact reduction was significantly lowered to 8 microV.

    Conclusions:

    • The new recording system and artifact reduction method enable high-quality simultaneous EEG/fMRI.
    • This breakthrough significantly expands the possibilities for cognitive neuroscience and clinical research using combined EEG/fMRI.