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EEG-triggered echo-planar functional MRI in epilepsy

S Warach1, J R Ives, G Schlaug

  • 1Department of Neurnlogy, Beth Israel Hospital, Boston, MA 02215, USA.

Neurology
|July 1, 1996
PubMed
Summary
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Simultaneous electroencephalography (EEG) and ultrafast functional MRI successfully detected focal brain activity during epileptic discharges. This novel technique may pinpoint seizure origins in epilepsy patients.

Area of Science:

  • Neuroimaging
  • Epileptology
  • Medical Technology

Background:

  • Simultaneously recording electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) presents technical challenges.
  • Identifying the precise brain regions responsible for epileptic discharges is crucial for effective epilepsy treatment.

Observation:

  • EEG recordings were successfully performed within an MRI imager.
  • Ultrafast fMRI images were triggered by subclinical epileptic discharges.
  • Artifact-free fMRI images were acquired during concurrent EEG monitoring.

Findings:

  • Focal signal increases, indicating increased local blood flow, were observed in ultrafast fMRI.
  • These signal increases were specifically timed to epileptic discharges.
  • One patient exhibited a focal increase despite a history of generalized discharges.

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Implications:

  • This integrated EEG-fMRI approach shows potential for localizing brain regions activated by brief epileptic events.
  • It may offer a new method for identifying seizure onset zones in epilepsy.
  • Further research could refine this technique for clinical diagnostic applications.