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Related Experiment Video

Updated: Sep 17, 2025

Robotic-Guided Stereoelectroencephalography for Invasive Epilepsy Monitoring
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Predictors of frame-based SEEG electrode implantation accuracy.

Thanomporn Wittayacharoenpong1, Matthew Gutman2, Martin Hunn2

  • 1Department of Neurology, Alfred Health, Melbourne, VIC, Australia; Department of Neuroscience, School of Translational Medicine, Monash University, Melbourne, VIC, Australia.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|June 28, 2025
PubMed
Summary

Accurate stereo-electroencephalography (SEEG) electrode placement is crucial. Deeper implantation, thicker bone, and electrode angle significantly impact accuracy, with increased radial error leading to missed targets.

Keywords:
Electrode accuracyElectrode placementEpilepsy surgeryFrame-based procedureSEEGStereo-electroencephalography

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Area of Science:

  • Neurosurgery
  • Neurology
  • Medical Imaging

Background:

  • Stereo-electroencephalography (SEEG) electrode accuracy factors are inconsistently reported.
  • This study addresses SEEG implantation variables and factors for unsuccessful sub-lobar target sampling using traditional frame-based methods.

Purpose of the Study:

  • To examine pre- and post-implantation variables influencing SEEG electrode accuracy.
  • To identify factors contributing to unsuccessful sub-lobar target sampling.
  • To provide a comprehensive reference for future SEEG implantations.

Main Methods:

  • Analysis of consecutive frame-based SEEG implantations.
  • Co-registration of pre-implantation MRI with post-implantation CT to determine planned vs. actual trajectories.
  • Calculation of absolute, radial, and depth errors; multivariate regression models assessed predictive factors for errors and off-target electrodes.

Main Results:

  • 629 electrodes from 50 patients analyzed; median absolute error 1.85 mm, radial error 1.56 mm.
  • 8.59% of electrodes were off-target; 19.89% exceeded the 2 mm safety margin.
  • Pre-implantation factors (trajectory angle, bone thickness, depth) and post-implantation factors (bone entry point localization error, bone thickness, depth) predicted radial errors.

Conclusions:

  • Electrode target radial error is strongly predicted by implantation depth, bone thickness, and bone entry angle.
  • Increased radial error is associated with missing the intended sub-lobar target.
  • Further research is needed to understand the clinical implications of electrode inaccuracy.