Multi-Compartment Volume Conductor with Complete Electrode Model: Simulated Stereo-EEG Source Localization using Brainstorm-Zeffiro Plugin

TL;DR

This paper presents a new integrated pipeline combining Brainstorm and Zeffiro Interface for detailed multi-compartment head modeling and source localization in stereo-EEG, enhancing accuracy with the complete electrode model.

Contribution

It introduces the BST-2-ZI plugin enabling seamless transfer of anatomical data and FE mesh generation for precise EEG source imaging in stereo-EEG applications.

Findings

Accurate modeling of multi-compartment head geometry and conductivity.

Demonstrated end-to-end pipeline from MRI to source localization.

Preliminary results show improved localization with combined scalp and stereo-EEG data.

Abstract

This study introduces a novel integration of the Brainstorm (BST) software and the Zeffiro Interface (ZI) to enable whole-head, multi-compartment volume conductor modeling for electroencephalography (EEG) source imaging, with a particular focus on stereotactic EEG applications. We present the BST-2-ZI plugin, a MATLAB-based tool that facilitates seamless transfer of tissue segmentations and anatomical atlases from BST into ZI for finite element (FE) mesh generation as well as forward and inverse modeling. The generated FE meshes support variable spatial resolution and implement the complete electrode model (CEM), allowing for precise modeling of both invasive depth electrodes and non-invasive scalp electrodes. Using the ICBM152 template and synthetic source simulation, we demonstrate the end-to-end pipeline from MRI data to lead field (LF) computation and source localization in a stereotactic EEG (stereo-EEG) setting. Our numerical experiments highlight the capability of the pipeline to accurately model multi-compartment head geometry and conductivity with a stereotactic CEM-based electrode configuration. Our preliminary source localization results show how a synthetic stereo-EEG probe corresponding to a bidirectional deep brain stimulation (DBS) probe with four omnidirectional contacts can, in principle, be coupled with scalp electrodes to improve source localization in its vicinity.