The MEG topography and the source model of abnormal neural activities associated with brain lesions

Conference · Mon Sep 01 04:00:00 EDT 1986 · IEEE Trans. Magn.; (United States)

OSTI ID:6549326

Ueno, S; Iramina, K; Ozaki, H; Harada, K

A source model is proposed to simulate spatial distributions of abnormal MEG and EEG activities generated by abnormal neural activities such as the delta activity associated with brain tumors. Brain tumor itself is electrically silent and the spherical shell around the tumor might generate abnormal neural activities. The sources of these neural activities are represented by combinations of multiple current dipoles. The head is assumed to be a spherical volume conductor. Electrical potentials and magnetic fields over the surface of the spheres are calculated. The computer simulation shows that the MEG topography and EEG topography vary variously with combinations of location and orientation of the dipoles. In a special case, however, that the dipoles orient in the same direction or orient radially, the spatial patterns of the MEGs and EEGs generated by numerous dipoles are analogous to those generated by single dipoles.

• Research Organization: Dept. of Electronics, Kyushu Univ., Fukuoka 812
• OSTI ID: 6549326
• Report Number(s): CONF-860436-
• Conference Information: Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG-22:5
• Country of Publication: United States
• Language: English

Related Subjects

550600* -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
COMPUTERIZED SIMULATION
DIPOLE MOMENTS
DISEASES
DISTRIBUTION
ELECTRIC POTENTIAL
MAGNETIC DIPOLE MOMENTS
MAGNETIC FIELDS
MAGNETIC MOMENTS
NEOPLASMS
NERVOUS SYSTEM
ORGANS
ORIENTATION
PATTERN RECOGNITION
SIMULATION
SPATIAL DISTRIBUTION
TOPOGRAPHY