NDLI: Dipole Localization of Human Induced Focal Afterdischarge Seizure in Simultaneous Magnetoencephalography and Electrocorticography

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Noninvasive Localization of Electromagnetic Epileptic Activity. II. Demonstration of Sublobar Accuracy in Patients with Simultaneous Surface and Depth Recordings

Brain Topography : Volume 14, Issue 1, September 2001

Brain Topography : Volume 13

Brain Topography : Volume 12

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Brain Topography : Volume 10

Brain Topography : Volume 9

Dipole Localization of Human Induced Focal Afterdischarge Seizure in Simultaneous Magnetoencephalography and Electrocorticography

Content Provider	Springer Nature Link
Author	Sutherling, William W. Akhtari, Massoud Mamelak, Adam N. Mosher, John Arthur, Deborah Sands, Steve Weiss, Peter Lopez, Nancy DiMauro, Mauricio Flynn, Edward Leahy, Richard
Copyright Year	2001
Abstract	Localizations were compared for the same human seizure between simultaneously measured MEG and iEEG, which were both co-registered to MRI. The whole-cortex neuromagnetometer localized a dipole in a sphere phantom, co-registered to the MEG sensor array, with an error of 1.4 mm. A focal afterdischarge seizure was induced in a patient with partial epilepsy, by stimulation at a subdural electrocorticography (ECoG) electrode with a known location, which was co-registered to the MRI and to the MEG sensor array. The simultaneous MEG and ECoG during the 30-second seizure was measured and analyzed using the single, moving dipole model, which is the localization model used clinically. The dipole localizations from simultaneous whole cortex 68-channel MEG and 64-channel ECoG were then compared for the repetitive spiking at six different times during the seizure. There were two main regions of MEG and ECoG activity. The locations of these regions were confirmed by determining the location clusters of 8,000 dipoles on ECoG at consecutive time points during the seizure. The mean distances between the stimulated electrode location versus the dipole location of the MEG and versus the dipole location of the ECoG were each about one (1) centimeter. The mean distance between the dipole locations of the MEG versus the dipole locations of the ECoG was about 2 cm. These errors were compared to errors of MEG and ECoG reported previously for phantoms and for somatosensory evoked responses (SER) in patients. Comparing the findings from the present study to those from prior studies, there appeared to be the expected stepwise increase in mean localization error progressing from the phantom, to the SER, to the seizure.
Starting Page	101
Ending Page	116
Page Count	16
File Format	PDF
ISSN	08960267
Journal	Brain Topography
Volume Number	14
Issue Number	2
e-ISSN	15736792
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Neurosciences Neurology Psychiatry
Content Type	Text
Resource Type	Article
Subject	Neurology Anatomy Radiology, Nuclear Medicine and Imaging Neurology (clinical) Radiological and Ultrasound Technology

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