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Related Experiment Video

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Scalp electrode placement accuracy for the canine electroencephalography array.

Stephen Everest1,2, Myles St-Denis1, Robert Dony3

  • 1Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada.

Frontiers in Veterinary Science
|July 7, 2025
PubMed
Summary

This study quantifies electroencephalography (EEG) electrode placement error in dogs, revealing significant accuracy gaps across different skull types. Improved canine EEG localization methods are needed for better neurological diagnosis.

Keywords:
10–20 systemdogselectroencephalographyepilepsyseizuresstandardized electrode placement

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Area of Science:

  • Veterinary Neurology
  • Neuroimaging

Background:

  • Idiopathic epilepsy is common in dogs, yet electroencephalography (EEG), the gold standard for seizure detection, is underutilized in veterinary medicine.
  • Current EEG practices in dogs lack standardized quantification of electrode placement accuracy relative to canine cortical topography.

Purpose of the Study:

  • To quantify intra-observer electroencephalography (EEG) electrode placement error in virtual canine brain models.
  • To identify knowledge gaps in canine EEG electrode localization accuracy across diverse skull conformations.

Main Methods:

  • Virtual models of canine heads and brains were created from CT scans of Brachycephalic, Mesocephalic, and Dolichocephalic dogs.
  • Electrode placement error was quantified using a stereotactic brain atlas and a universal coordinate system for Mesocephalic dogs, and relative to cortical landmarks for others.

Main Results:

  • Identified gaps in cortical coverage, notably in olfactory/frontal regions (brachycephalic) and parietal regions (Mesocephalic/Dolichocephalic).
  • Quantified electrode localization variance in Mesocephalic dogs, with minimum variance at the F8 electrode (0.8 mm) and maximum at the Cz electrode (35.2 mm).

Conclusions:

  • This study is the first to highlight inaccuracies in canine EEG electrode localization.
  • Demonstrated differences in EEG array coverage across canine skull types.
  • Emphasized the urgent need for stereotactic brain atlases tailored to specific canine skull conformations for improved EEG accuracy.