PT  - JOURNAL ARTICLE
AU  - W W Orrison
AU  - L E Davis
AU  - G W Sullivan
AU  - F A Mettler, Jr
AU  - E R Flynn
TI  - Anatomic localization of cerebral cortical function by magnetoencephalography combined with MR imaging and CT.
DP  - 1990 Jul 01
TA  - American Journal of Neuroradiology
PG  - 713--716
VI  - 11
IP  - 4
4099  - http://www.ajnr.org/content/11/4/713.short
4100  - http://www.ajnr.org/content/11/4/713.full
SO  - Am. J. Neuroradiol.1990 Jul 01; 11
AB  - Magnetoencephalography (MEG) monitors magnetic field amplitudes, which are time averages of evoked neuronal responses. This method can detect magnetic fields emanating from the brain and localize the neuronal source. The location of somatosensory neuronal sources for voluntary right thumb and right index finger flexions were determined in four normal volunteers by using a seven-sensor neuromagnetometer inside a magnetically shielded room. These neuronal sources were then identified on the individual's respective CT or MR scans, and correlation was accomplished by geometric calculations, direct cranial measurement, and surface marker identification. Specific functional magnetic fields were located over the appropriate sensory motor cortex; however, there was considerable variation in the exact site. Magnetoencephalography combined with CT and MR may improve localization of normal and abnormal neurologic function.