gms | German Medical Science

57th Annual Meeting of the German Society of Neurosurgery
Joint Meeting with the Japanese Neurosurgical Society

German Society of Neurosurgery (DGNC)

11 - 14 May, Essen

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A new expression mode of magnetic brain activities – gradient magnetic field topography and its movie display, especially in epilepsy cases

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  • corresponding author K. Kurisu - Department of Neurosurgery, Hiroshima University Hospital, Hiroshima, Japan
  • A. Hashizume - Department of Neurosurgery, Hiroshima University Hospital, Hiroshima, Japan
  • K. Iida - Department of Neurosurgery, Hiroshima University Hospital, Hiroshima, Japan
  • H. Shirozu - Department of Neurosurgery, Hiroshima University Hospital, Hiroshima, Japan
  • K. Sugiyama - Department of Neurosurgery, Hiroshima University Hospital, Hiroshima, Japan

Deutsche Gesellschaft für Neurochirurgie. Japanische Gesellschaft für Neurochirurgie. 57. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie e.V. (DGNC), Joint Meeting mit der Japanischen Gesellschaft für Neurochirurgie. Essen, 11.-14.05.2006. Düsseldorf, Köln: German Medical Science; 2006. DocSO.08.07

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/dgnc2006/06dgnc215.shtml

Published: May 8, 2006

© 2006 Kurisu et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

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Objective: To evaluate epileptic phenomenon in patients with intractable epilepsy by gradient magnetic field topography and its movie display.

Methods: The authors have created gradient magnetic field topography and its movie display to recognize the magnetic brain activities. We have used Neuromag system with 102 orthogonal paired planar type gradiometers. Measured data at 102 sensor points were projected onto the surface of patient’s individual brain. Gradient magnetic field topographies were calculated after interpolation among the projected sensors’ points. Furthermore, hundreds or thousands of consecutive topographies were packed as motion picture experts group (MPEG) files. In this way, we can observe the change and spread of biomagnetic activities on the screen of the PC monitor. In addition, we compared the data with those recorded by subdural continuous recording in some cases.

Results: Information provided by this method was very helpful to evaluate epileptic brain activities as compared with conventional EEG and continuous EEG monitoring estimation. It was very interesting and exciting that we can estimate the epileptogenic zone by this method which is recorded during interictal periods.

Conclusions: Using this method, we can evaluate epileptic brain activity visually and topographically in intractable epilepsy patients. In the presentation, we will show the typical case in a movie.