Automatic Electrodes Detection during simultaneous EEG/fMRI acquisition

TL;DR

This paper presents a method for automatic detection of EEG electrodes during simultaneous EEG/fMRI scans using UTE imaging and sphere detection, achieving high detection accuracy and precise electrode localization.

Contribution

It introduces a UTE-based imaging technique combined with a sphere detection algorithm for automatic electrode localization during EEG/fMRI acquisition.

Findings

Detected approximately 90% of electrodes per subject.

Achieved an average electrode position error of 3.7mm.

Demonstrated reliable electrode detection in a clinical setting.

Abstract

Simultaneous EEG/fMRI acquisition allows to measure brain activity at high spatial-temporal resolution. The localisation of EEG sources depends on several parameters including the position of the electrodes on the scalp. The position of the MR electrodes during its acquisitions is obtained with the use of the UTE sequence allowing their visualisation. The retrieval of the electrodes consists in obtaining the volume where the electrodes are located by applying a sphere detection algorithm. We detect around 90% of electrodes for each subject, and our UTE-based electrode detection showed an average position error of 3.7mm for all subjects.