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Direct visualization of the human subthalamic nucleus with 3T MR imaging
K V Slavin1, K R Thulborn, C Wess
1Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL 60612, USA.
AJNR. American Journal of Neuroradiology
|January 19, 2006
Summary
High-resolution 3T MRI reliably visualizes the subthalamic nucleus (STN) for Parkinson disease surgery. This direct visualization improves targeting accuracy, reducing the need for lengthy intraoperative electrophysiological searches and minimizing tissue disruption.
Area of Science:
- Neurosurgery
- Radiology
- Neurology
Background:
- Subthalamic nucleus (STN) deep brain stimulation is effective for advanced Parkinson disease (PD).
- Accurate STN targeting is challenging due to its small size and variable location.
- Current methods rely on indirect targeting using CT, atlas coordinates, and neurophysiology, with limitations in direct STN visualization.
Purpose of the Study:
- To evaluate the utility of 3 Tesla (3T) Magnetic Resonance (MR) imaging for direct visualization of the STN.
- To assess the accuracy of STN targeting using 3T MR imaging in patients with PD.
Main Methods:
- Preoperative stereotactic 3T MR imaging was performed in 13 PD patients undergoing deep-brain stimulation.
- High-resolution T2-weighted fast spin-echo images were acquired in axial, sagittal, and coronal planes.
- The STN was identified in three planes using a stereotactic frame and cross-referencing.
Main Results:
- The STN was successfully visualized as a distinct hypointense structure in all patients.
- Its anatomical location relative to the red nucleus and internal capsule was precisely identified.
- Intraoperative microelectrode recordings confirmed the accuracy of the MR-based coordinates on the first pass.
Conclusions:
- 3T MR imaging provides reliable and accurate direct visualization of the human STN.
- This technique facilitates precise surgical targeting for STN deep brain stimulation in PD.
- Improved visualization reduces operative time and potential complications associated with targeting.