30 / 1266
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