Evaluating and Optimizing Dentato-Rubro-Thalamic-Tract Deterministic Tractography in Deep Brain Stimulation for...

Area of Science:

• Neuroscience
• Neurosurgery
• Medical Imaging

Background:

• Deep brain stimulation (DBS) of the dentato-rubro-thalamic tract (DRT) effectively suppresses essential tremor (ET).
• Tractography-based depictions of the DRT vary, and the optimal DRT segment for DBS remains unclear.
• Variability in DRT depiction may impact the efficacy of DBS for ET.

Purpose of the Study:

• To evaluate deterministic DRT tractography in relation to tremor control achieved with DBS in ET patients.
• To identify the optimal DRT depiction for correlating with intraoperative tremor control.
• To assess the short-term postoperative effects of DBS guided by optimized DRT tractography.

Main Methods:

• DRT tractography was performed post-DBS surgery in 20 ET patients (37 trajectories).
• Five distinct DRT depictions were generated per trajectory using various regions of interest (ROIs).
• The DRT depiction with the highest correspondence to intraoperative tremor control was selected for further analysis.

Main Results:

• An optimized DRT depiction using ROIs (motor cortex, posterior subthalamic area, superior cerebellar peduncle, dentate nucleus) showed high correspondence with intraoperative trajectories (92%) and active DBS contacts (93%) for tremor control.
• DRT tractography using red nucleus or ventral intermediate nucleus (VIM) ROIs often resulted in a medial trajectory.
• Optimal stimulation sites were identified between the VIM and the posterior subthalamic area (PSA).

Conclusions:

• Optimized deterministic DRT tractography demonstrates a strong correlation with effective tremor control in ET patients.
• This tractography technique is practical for implementation in future DBS target planning for ET.
• The findings support the use of this optimized method for enhancing DBS efficacy in essential tremor.