Chronic thalamic stimulation with three-dimensional MR stereotactic guidance

Area of Science:

• Neurosurgery
• Medical Imaging
• Neurology

Background:

• Medically refractory tremor poses a significant challenge in neurological treatment.
• Accurate electrode placement is crucial for effective deep brain stimulation (DBS).
• Traditional stereotactic techniques may have limitations in precision for targeting deep brain structures.

Purpose of the Study:

• To describe a novel method for electrode implantation in the ventralis intermedius nucleus of the thalamus.
• To utilize 3-D stereotactic magnetic resonance (MR) imaging for enhanced surgical precision.
• To evaluate the efficacy of this technique in treating patients with medically refractory tremor.

Main Methods:

• Five patients with essential tremor underwent stereotactic MR imaging-guided electrode implantation.
• A 1.5-T MR unit and an MR-compatible Leksell G stereotactic frame were employed.
• Target coordinates were determined using MR imaging, with intraoperative electrophysiological and clinical validation.
• Postoperative MR imaging confirmed electrode placement accuracy.

Main Results:

• Stereotactic MR imaging enabled precise electrode implantation in all cases.
• Significant tremor reduction was observed post-implantation, with reductions up to 90%.
• Mean electrode positioning error was minimal (0.77 mm in x, 0.80 mm in y).

Conclusions:

• 3-D stereotactic MR imaging is a reliable and precise method for functional neurosurgery.
• This technique offers high confidence for accurate electrode placement in the thalamus.
• The findings support the use of MR-guided stereotaxy for tremor treatment.