MEG and ECoG localization accuracy test

Sina Gharib, William W. Sutherling, Nobukazu Nakasato, Daniel S. Barth, Christoph Baumgartner, N. Alexopoulos, Steve Taylor, Robert L. Rogers

研究成果: Article査読

40 被引用数 (Scopus)

抄録

We tested the localization accuracy of magnetoencephalography (MEG) and electrocorticography (ECoG) for a current dipole in a saline filled sphere at depths ranging from 1 to 6 cm at 1 cm intervals. We used standard neuromagnetometer placements and subdural electrode grids, previously employed for patient studies, with precise measurements of sensor and electrode locations with a 3-dimensional spatial digitizer. MEG and ECoG had comparable accuracy with mean errors of 1.5 and 1.8 mm, respectively. It appears that use of the spatial digitizer increases accuracy for both MEG and EGoG localizations. The larger errors in the ECoG with increasing depths could be attributed to under-sampling of the spatial pattern of the field which spreads out with deeper sources. It should be noted that in clinical applications a grid of the dimensions used here would most typically be used for superficial sources on the cortex with depth recordings being preferred for investigations of deep epileptogenic activity. Results are encouraging for continued development of non-invasive MEG methods for further definition of epileptogenic zones in the brain.

本文言語English
ページ(範囲)109-114
ページ数6
ジャーナルElectroencephalography and Clinical Neurophysiology
94
2
DOI
出版ステータスPublished - 1995 2

ASJC Scopus subject areas

  • 神経科学(全般)
  • 臨床神経学

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