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Related Experiment Videos

[ECG-triggered EEG in a static magnetic field].

L von Klitzing1

  • 1Klinisch-Experimentelle Forschungseinrichtung, Medizinische Universität zu Lübeck.

EEG-EMG Zeitschrift Fur Elektroenzephalographie, Elektromyographie Und Verwandte Gebiete
|September 1, 1990
PubMed
Summary

Static magnetic fields in MRI trigger electroencephalogram (EEG) signals with heart activity. These EEG signals shift from an isotropic to an anisotropic state within the magnetic field.

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[Do encephalo-electric signals determine the pulse frequency in man?].

EEG-EMG Zeitschrift fur Elektroenzephalographie, Elektromyographie und verwandte Gebiete·1992
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[Current status of knowledge of the effects of uniform magnetic fields on biological systems during MRI studies].

Rontgenpraxis; Zeitschrift fur radiologische Technik·1991
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A new encephalomagnetic effect in human brain generated by static magnetic fields.

Brain research·1991
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Short-term exposure to a 1.5 tesla static magnetic...

Magnetic resonance imaging·1991
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[Is the isotropic load distribution in the cortical space increased by a static magnetic field?].

EEG-EMG Zeitschrift fur Elektroenzephalographie, Elektromyographie und verwandte Gebiete·1990
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[Effect of static magnetic fields on biosignal processing in humans].

Biomedizinische Technik. Biomedical engineering·1990

Area of Science:

  • Neuroscience
  • Biophysics
  • Medical Imaging

Context:

  • Electroencephalography (EEG) is commonly used for brain activity monitoring.
  • Magnetic Resonance Imaging (MRI) utilizes strong static magnetic fields for diagnostics.
  • The interaction between EEG signals and static magnetic fields is not fully understood.

Purpose:

  • To investigate the effect of static magnetic fields, as used in clinical MRI, on spontaneous electroencephalogram (EEG) signals.
  • To characterize the nature of EEG signal alterations induced by these magnetic fields.
  • To explore the potential for magnetic fields to influence the spatial distribution of EEG currents.

Summary:

  • Spontaneous EEG signals are observed to be triggered by cardiac activity in the presence of static magnetic fields typical of MRI environments.
  • The EEG signal exhibits oscillations between 8-10 Hz, often starting at higher frequencies.
  • Signal characteristics demonstrate dependence on the magnetic flux vector but lack regularity and lead-point independence, suggesting a transition in current distribution.

Impact:

  • Reveals that static magnetic fields can alter the normally isotropic distribution of EEG currents towards an anisotropic state.
  • Provides insights into the biophysical interactions between electromagnetic fields and biological electrical activity.
  • Suggests implications for EEG monitoring during or in proximity to MRI procedures.

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