The functional neuroimaging allows non-invasive mapping of the whole brain, estimating the location of eloquent areas adjacent to the tumor, which revolutionized DLGG approach. The most important techniques include functional MRI (fMRI), magnetoencephalography , white fiber tractography by Diffusion tension imaging (DTI) and transcranial magnetic stimulation. (41,48) fMRI is a noninvasive imaging modality that uses cortical blood flow changes as a tracer for increased or decreased neuronal activity, thus allowing cortical mapping when the patients perform specific tasks. One should note that it does not allow white matter mapping.
DTI is a form of MRI used to delimitate white matter anatomy, in order to map the subcortical tracts position
DTI is a form of MRI used to delimitate white matter anatomy, in order to map the subcortical tracts position