Patient-specific anatomical model for deep brain stimulation based on 7 Tesla MRI

Area of Science:

• Neurosurgery
• Medical Imaging
• Neurology

Background:

• Accurate targeting of anatomical structures like the subthalamic nuclei (STN) is crucial for effective deep brain stimulation (DBS).
• Ultra-high field 7 Tesla (T) MRI offers high-resolution imaging for creating patient-specific anatomical models.

Purpose of the Study:

• To validate the accuracy of patient-specific STN models generated from 7T MRI for pre-surgical DBS targeting.
• To assess the variability in STN location and dimensions across movement disorder patients.

Main Methods:

• 7T MRI scans were acquired from 72 patients undergoing DBS surgery.
• Patient-specific 3D STN models were generated and visualized.
• Validation was performed using microelectrode recording (MER) in 21 cases and VTA-STN overlap with monopolar review in 12 cases.

Main Results:

• Successful reconstruction and visualization of the STN in all patients.
• Significant inter-individual variability in STN location, volume, length, depth, and width was observed.
• High correlations were found between the 7T STN model and MER (r=0.86), and VTA-STN overlap and monopolar review (r=0.61).

Conclusions:

• 7T MRI facilitates accurate, patient-specific 3D STN modeling for DBS.
• The validated model aids in precise pre-surgical targeting and post-operative visualization.
• Understanding STN variability underscores the importance of direct visualization for optimizing DBS outcomes.