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NEUROLOGY 1991;41:1072
© 1991 American Academy of Neurology

Localization of implanted dipoles by magnetoencephalography

M. Balish, MD, PhD, S. Sato, MD, P. Connaughton and C. Kufta, MD

Neurophysiology Unit, Medical Neurology Branch, National Institute of Neurologic Diseases and Stroke, National Institutes of Health, Bethesda, MD.

We attempted to validate the location of sources predicted by magnetoencephalography (MEG) by studying 19 specially designed dipole electrodes implanted in six patients with intractable partial seizures who were undergoing subdural electrode recording. We used a seven-channel magnetometer to measure the magnetic fields produced by passing through the dipoles a 40-µA, 5-msec square-wave pulse followed 40 msec later by a pulse of opposite polarity; 200 pulses were averaged for each magnetometer position. The actual dipole locations were measured from skull radiographs, and we based MEG localization on a spherical head model with the inclusion of volume currents. MEG estimates of the sources were within several centimeters (mean, 1.69 cm) of the measured locations. We conclude that MEG localization was promising.

Address correspondence and reprint requests to Dr. M. Balish, Building 10, Room 5C408, NINDS, NIH, Bethesda, MD 20892.

Presented in part at the 42nd annual meeting of the American Academy of Neurology, Miami Beach, FL, April 1990.

Received September 19, 1990. Accepted for publication in final form December 20, 1990.




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