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Application of Electric-Field-Optimized Augmented Reality-Guided Neuronavigation in Transcranial Magnetic

Pia Ritter1, Sascha Freigang2, Antonio Valentin3

  • 1Department of Radiology, Clinical Division of Neuroradiology, Vascular and Interventional Radiology, Medical University of Graz, 8036 Graz, Austria.

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|April 14, 2026
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Summary

Electric-field optimized navigated repetitive TMS (nrTMS) with AR guidance improved coil accuracy but did not increase language mapping. Different language error patterns emerged, offering insights into TMS neurophysiology.

Keywords:
augmented realityelectric-field simulationlanguage mappingobject naming taskresting-state fMRItranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Neuromodulation

Background:

  • Navigated repetitive TMS (nrTMS) is crucial for non-invasive cortical function mapping.
  • Optimizing coil positioning via electric-field modeling and AR-guided neuronavigation may enhance spatial accuracy and reduce stimulation-induced language errors.
  • This study compares electric-field optimized, AR-guided nrTMS with conventional manual nrTMS.

Purpose of the Study:

  • To compare the effectiveness of electric-field optimized, AR-guided nrTMS versus conventional manual nrTMS for language mapping.
  • To assess differences in mapped cortical regions and stimulation-induced language errors.
  • To evaluate the practical feasibility and accuracy of optimized coil placements.

Main Methods:

  • Twenty-eight healthy subjects underwent two MRI-guided left hemispheric nrTMS language mapping sessions.
  • 10 Hz stimulation at 100% resting motor threshold was applied to ROIs during an object naming task.
  • Coil positions were either manually planned or electric-field optimized using SimNIBS, with the latter assisted by AR goggles.

Main Results:

  • Electric-field optimized nrTMS did not increase the number of positively mapped ROIs.
  • A different distribution of language errors was observed between the two methods.
  • AR guidance improved target location accuracy, though optimized coil positions were not always feasible.

Conclusions:

  • AR guidance is a valuable addition to TMS experiments, enhancing target accuracy.
  • Electric-field optimization did not yield significant behavioral differences in language mapping.
  • Altered language error distributions provide insights into the neurophysiological mechanisms of repetitive TMS (rTMS).