Resting-state Functional Magnetic Resonance Imaging in Presurgical Functional Mapping: Sensorimotor Localization

Area of Science:

• Neuroimaging
• Neurosurgery
• Functional Magnetic Resonance Imaging

Background:

• Presurgical functional mapping is crucial for neurosurgery.
• Accurate localization of eloquent brain regions, like the sensorimotor cortex, minimizes surgical risks.
• Traditional task-based functional MRI (fMRI) has limitations in capturing the full extent of functional areas.

Purpose of the Study:

• To compare the efficacy of resting-state fMRI (rs-fMRI) versus task-based fMRI for presurgical functional mapping of the sensorimotor region.
• To evaluate the overlap between functional maps derived from both methods and anatomical definitions of the sensorimotor area.

Main Methods:

• 38 patients underwent both rs-fMRI and task-based fMRI prior to tumor resection.
• Sensorimotor regions were anatomically defined using two distinct software tools.
• Overlap analysis was performed between anatomical regions of interest and functional maps (task-activation and resting-state networks).

Main Results:

• A paired t-test revealed that rs-fMRI maps demonstrated a significantly higher overlap with anatomical references compared to task-based fMRI maps.
• This finding was consistent when using a maximal overlap criterion for comparison.
• Resting-state derived maps were found to be more comprehensive in their coverage of the sensorimotor region.

Conclusions:

• Resting-state fMRI provides a more comprehensive and potentially more accurate method for presurgical functional mapping of the sensorimotor cortex.
• rs-fMRI's superior overlap with anatomical data suggests it may be a more reliable tool for surgical planning in neuro-oncology.
• These findings advocate for the increased utilization of rs-fMRI in presurgical evaluations to enhance surgical precision and patient outcomes.