Journal
EPILEPTIC DISORDERS
Volume 14, Issue 3, Pages 298-303Publisher
JOHN LIBBEY EUROTEXT LTD
DOI: 10.1684/epd.2012.0517
Keywords
stereotactic electroencephalography; magnetoencephalography; simultaneous recording; volume conduction; quadratic fall-off
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Funding
- National Institutes of Health [R01-EB009048, R01-NS074980]
- Epilepsy Center of the Cleveland Clinic Neurological Institute
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Simultaneous SEEG-MEG recording has the potential to define the epileptic spike source accurately. We present a case of a 55-year-old female with intractable left temporal lobe epilepsy in whom we evaluated the relationship between the amplitude recorded from SEEG electrodes, inserted in the lateral temporal region, and their distance from the MEG-modelled spike. We found a quadratic fall-off relationship between the amplitude and distance. This result supports the concept that the MEG dipoles reflect the centre of spike locations and may provide comprehensive information for SEEG which records spike activities directly but is inherently limited in spatial sampling.
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