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Related Experiment Videos

Cardiac artifacts in magnetoencephalogram

V Jousmäki1, R Hari

  • 1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|March 1, 1996
PubMed
Summary
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Cardiac currents contaminate magnetoencephalography (MEG) signals, particularly in the left hemisphere. Researchers found these magnetic artifacts, averaging 130 fT/cm, impact spontaneous brain activity recordings and require careful analysis.

Area of Science:

  • Biophysics
  • Neuroscience
  • Biomedical Engineering

Background:

  • Magnetoencephalography (MEG) is a non-invasive neuroimaging technique.
  • Cardiac activity can generate artifacts in MEG recordings.
  • Understanding and mitigating these artifacts is crucial for accurate brain activity analysis.

Purpose of the Study:

  • To investigate the characteristics of cardiac contamination in whole-scalp MEG signals.
  • To quantify the amplitude and distribution of cardiac artifacts.
  • To determine the origin of these magnetic artifacts.

Main Methods:

  • MEG signals were recorded from eight healthy volunteers in a magnetically shielded room.
  • Signals were averaged time-locked to the R wave of the electrocardiogram.

Related Experiment Videos

  • Cardiac artifacts were analyzed for amplitude and hemispheric distribution.

    • Main Results:

    • The average amplitude of cardiac artifacts was 130 fT/cm.
    • Significantly more channels were contaminated over the left hemisphere compared to the right.
    • The temporal variation of electric and magnetic signals indicated cardiac current origins.

    Conclusions:

    • Cardiac currents are the primary source of magnetic artifacts in MEG, not blood flow or movement.
    • These artifacts can significantly affect unaveraged spontaneous brain activity data.
    • Accounting for cardiac contamination is essential for robust MEG data analysis.