76-77 / 2437
PHYSIOLOGICAL IMAGING
FUNCTIONAL IMAGING - fMRI
•
Pitfalls:
• Does not monitor the neural response but a “surrogate” hemodynamic response
• Cannot distinguish essential hubs -> need for intraoperative monitoring
• Low localisation accuracy
•
Neurovascular uncoupling
(tumor infiltration zone, neovascularity) with reduced
fMRI signal in perilesional cortex
• More accurate for motor mapping than for speech
• Not giving any functional information about subcortical white matter pathways
Finger Tapping
Semantic speech