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Related Experiment Video

Updated: Mar 2, 2026

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
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Functional network reorganization following VIM-MRgFUS for essential tremor.

Jinlong Liu1, Jonas Krauss2, Veronika Purrer3

  • 1University of Bonn, University Hospital Bonn, Clinical Functional Imaging Group, Department of Nuclear Medicine, Bonn, Germany.

Neurotherapeutics : the Journal of the American Society for Experimental Neurotherapeutics
|February 28, 2026
PubMed
Summary

Magnetic resonance-guided focused ultrasound (MRgFUS) for essential tremor (ET) selectively reorganizes brain networks. Six months post-treatment, functional connectivity shows altered clustering and nodal centrality, indicating targeted network changes.

Keywords:
Brain networksEssential tremorGraph theory analysisMRgFUSVentral intermediate nucleus

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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.