Functional network reorganization following VIM-MRgFUS for essential tremor.

Area of Science:

• Neuroscience
• Medical Imaging
• Neurology

Background:

• Essential tremor (ET) is a neurological disorder affecting motor control.
• Magnetic resonance-guided focused ultrasound (MRgFUS) offers a noninvasive treatment option for ET.
• The impact of MRgFUS lesions on functional brain network organization in ET patients is not well understood.

Purpose of the Study:

• To investigate changes in brain network organization after unilateral MRgFUS treatment for ET.
• To analyze alterations in small-world properties and modular architecture using graph theory.
• To understand the functional network reorganization following VIM nucleus lesioning.

Main Methods:

• Graph theory analysis was applied to functional brain network data.
• Patients with ET underwent unilateral MRgFUS targeting the VIM nucleus.
• Network properties were assessed six months post-treatment.

Main Results:

• Significant increases in small-worldness and normalized clustering coefficient were observed.
• Clustering coefficient, path length, and efficiency metrics remained largely unchanged.
• Modular organization was preserved, with trend-level increases in inter-modular connectivity.
• Betweenness centrality increased in specific cortical hubs like the superior frontal gyrus and postcentral gyrus.

Conclusions:

• Unilateral VIM-MRgFUS induces selective functional network reorganization in ET patients.
• The treatment affects relative clustering and nodal centrality patterns within brain networks.
• These findings highlight targeted network modifications following MRgFUS therapy.