Event Abstract Back to Event Usefulness of Spatial filter techniques in MEG for epilepsy diagnosis Naohiro Tsuyuguchi1*, Takehiro Uda2, Yoshihito Shigihara3 and Kenji Ohata2 1 Osaka City University Graduate School of Medicine, Japan 2 Osaka City University Graduate School of Medicine, Department of Neurosurgery, Japan 3 Osaka City University Graduate School of Medicine, Department of Physiology, Japan MEG in epilepsy is useful for surgical treatment on determining epileptogenic focus by a signal dipole analysis on MRI. However, there are some cases in which it is difficult to estimate equivalent current dipole on the contrary that EEG and MEG clearly showed abnormal spike. This is the limitation of single dipole analysis for complex magnetic source of epileptic discharge. In such a case, spatial filter analysis called a virtual sensor technique may be useful.Methods: From all over intractable epileptic 70 cases, we selected 10 cases that had difficulty with dipole analysis.ãWe analyzed two ways of spatial filters of adaptive beamformer technique and non adaptive beamformer technique (sLORETA) and compared them. We chose 10 examples that had difficulty with single dipole analysis. In analysis, we extracted MEG data for approximately 30 seconds where same spikes were present on EEG.Results: As for sLORETA, it was rare that the results changed by width of analysis time. But area of an aberrant signal source was expressed greatly. In ABF, although an aberrant signal source was comparatively located, it was estimated in a slightly deep region from brain surface in comparison with sLORETA and its results depended on width in analysis time.Conclusions: Each spatial filter method haves advantage and disadvantage points. It is necessary to apply two spatial filter techniques to clinic stages under enough knowledge for those methods. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Epilepsy Citation: Tsuyuguchi N, Uda T, Shigihara Y and Ohata K (2010). Usefulness of Spatial filter techniques in MEG for epilepsy diagnosis. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00375 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 08 Apr 2010; Published Online: 08 Apr 2010. * Correspondence: Naohiro Tsuyuguchi, Osaka City University Graduate School of Medicine, Osaka, Japan, tnaohiro@aol.com Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Naohiro Tsuyuguchi Takehiro Uda Yoshihito Shigihara Kenji Ohata Google Naohiro Tsuyuguchi Takehiro Uda Yoshihito Shigihara Kenji Ohata Google Scholar Naohiro Tsuyuguchi Takehiro Uda Yoshihito Shigihara Kenji Ohata PubMed Naohiro Tsuyuguchi Takehiro Uda Yoshihito Shigihara Kenji Ohata Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.