Related Experiment Videos
Functional MRI: primary motor cortex localization in patients with brain tumors
A Righini1, O de Divitiis, A Prinster
1Neuroradiology Department, IRCCS Ospedale Maggiore-Policlinico, Milan, Italy.
Journal of Computer Assisted Tomography
|September 1, 1996
Summary
Functional MRI (fMRI) can localize the primary motor cortex in brain tumor patients, even with altered anatomy. However, success rates are lower due to motion artifacts and compliance issues.
Area of Science:
- Neuroimaging
- Neurosurgery
- Radiology
Background:
- Accurate localization of the primary motor cortex is crucial for neurosurgical planning.
- Brain neoplasms can distort normal neuroanatomy, posing challenges for functional mapping.
Purpose of the Study:
- To evaluate functional MRI (fMRI) for primary motor cortex localization in brain tumor patients.
- To compare motor activation in affected versus unaffected hemispheres.
Main Methods:
- Seventeen patients with frontoparietal tumors underwent fMRI using a conventional scanner.
- Finger-tapping and repetitive flexion-extension tasks were performed with each hand.
- Activation maps were generated using a Z-score method and superimposed on high-resolution images.
Main Results:
- fMRI detected signal increases in the precentral gyrus in most patients, despite tumor presence.
- Activated areas showed spot-like morphology with no significant side-to-side differences in shape or extent.
- Displacement of activated areas was observed in cases of severe gyral compression.
Conclusions:
- fMRI is feasible for localizing the primary motor cortex in brain tumor patients using conventional scanners.
- Lower success rates compared to healthy volunteers are attributed to motion artifacts and patient compliance.
- fMRI can detect motor activation even in anatomically distorted cortical regions.