[Recent advances of MEG].
The number of MEG(Magnetoencephalography) channels was rapidly increased from 14 to 306 in the past decade and the detection coil array with the whole-scalp coverage has become fairly common these days. Besides the advances of biomagnetometer itself, there are several important technical advances around MEG measurements. An active shielding technique can reduce the contamination of environmental magnetic noise in the frequency range below 10 Hz. Applying SSP(signal space projection) technique, which is known as a strong tool to resolve multiple current sources, can be another choice to reduce this contamination in the full frequency range. Recently the realistic head model reconstructed from MRI data was accomplished and we can apply this model, instead of the conventional spherical model, to the patients with TLE(temporal lobe epilepsy) expecting further accurate dipole estimation. These advances are quite important for the data acquisition with high S/N(signal to noise) ratio and the reliable three-dimensional localization of current sources in the brain.
Yumoto
M
M
Department of Clinical Laboratory, University of Tokyo Hospital.
D006801:Humans; D015225:Magnetoencephalography