T. Morioka et al., FUNCTIONAL MAPPING OF THE SENSORIMOTOR CORTEX - COMBINED USE OF MAGNETOENCEPHALOGRAPHY, FUNCTIONAL MRI, AND MOTOR EVOKED-POTENTIALS, Neuroradiology, 37(7), 1995, pp. 526-530
Citations number
41
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging",Neurosciences
Combined use of magnetoencephalography (MEG), functional magnetic reso
nance imaging (f-MRI), and motor evoked potentials (MEPs) was carried
out on one patient in an attempt to localise precisely a structural le
sion to the central sulcus. A small cyst in the right frontoparietal r
egion was thought to be the cause of generalised seizures in an otherw
ise asymptomatic woman. First the primary sensory cortex was identifie
d with magnetic source imaging (MSI) of somatosensory evoked magnetic
fields using MEG and MRI. Second, the motor area of the hand was ident
ified using f-MRI during hand-squeezing. Then transcranial magnetic st
imulation localised the hand motor area on the scalp, which was mapped
onto the MRI. There was a good agreement between MSI, f-MRI and MEP a
s to the location of the sensorimotor cortex and its relationship to t
he lesion. Multimodality mapping techniques may thus prove useful in t
he precise localisation of cortical lesions, and in the preoperative d
etermination of the best treatment for peri-rolandic lesions.