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Verification of neuronavigated TMS accuracy using structured-light 3D scans.

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  • 1Department of Electrical Engineering and Automation, Aalto University, Espoo, Finland.

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Summary

Manual three-point co-registration in neuronavigated transcranial magnetic stimulation (TMS) shows significant coil placement errors. Incorporating 3D scanning improves accuracy, crucial for precise electric field calculations in TMS research.

Keywords:
dosimetric modellingelectric fieldlandmark pointingnavigated TMSnavigation accuracytranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Neuronavigated transcranial magnetic stimulation (TMS) relies on accurate coil positioning.
  • Manual co-registration methods may introduce inaccuracies affecting stimulation precision.

Purpose of the Study:

  • To evaluate the reliability and accuracy of manual three-point co-registration in neuronavigated TMS.
  • To assess the impact of landmark pointing errors on coil placement and induced electric/magnetic fields.

Main Methods:

  • Compared neuronavigation system coil positions with 3D scanning data in ten healthy participants.
  • Calculated differences in coil location, orientation, and theoretical electric/magnetic field errors.
  • Determined the sensitivity of coil location accuracy to landmark pointing precision.

Main Results:

  • Average coil location error was 10.2 mm (range 3.1–18.7 mm) with angular errors of 2–3 degrees.
  • Coil misplacement resulted in average 29% electric field error (9–51%) and 33% magnetic field error (10–58%).
  • Landmark point misplacement could lead to a 1.8-fold error in coil location.

Conclusions:

  • Manual three-point co-registration in neuronavigated TMS introduces significant coil position errors.
  • These errors can impede research relying on precise electric field calculations.
  • Integrating 3D scanning offers an efficient method to enhance coil positioning accuracy in TMS.