CutFEM forward modeling for EEG source analysis
Erdbrügger, Tim; Westhoff, Andreas; Höltershinken, Malte; Radecke, Jan Ole; Buschermöhle, Yvonne; Buyx, Alena; Wallois, Fabrice; Pursiainen, Sampsa; Gross, Joachim; Lencer, Rebekka; Engwer, Christian; Wolters, Carsten (2023)
Erdbrügger, Tim
Westhoff, Andreas
Höltershinken, Malte
Radecke, Jan Ole
Buschermöhle, Yvonne
Buyx, Alena
Wallois, Fabrice
Pursiainen, Sampsa
Gross, Joachim
Lencer, Rebekka
Engwer, Christian
Wolters, Carsten
2023
1216758
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-2023111610025
https://urn.fi/URN:NBN:fi:tuni-2023111610025
Kuvaus
Peer reviewed
Tiivistelmä
Introduction: Source analysis of Electroencephalography (EEG) data requires the computation of the scalp potential induced by current sources in the brain. This so-called EEG forward problem is based on an accurate estimation of the volume conduction effects in the human head, represented by a partial differential equation which can be solved using the finite element method (FEM). FEM offers flexibility when modeling anisotropic tissue conductivities but requires a volumetric discretization, a mesh, of the head domain. Structured hexahedral meshes are easy to create in an automatic fashion, while tetrahedral meshes are better suited to model curved geometries. Tetrahedral meshes, thus, offer better accuracy but are more difficult to create. Methods: We introduce CutFEM for EEG forward simulations to integrate the strengths of hexahedra and tetrahedra. It belongs to the family of unfitted finite element methods, decoupling mesh and geometry representation. Following a description of the method, we will employ CutFEM in both controlled spherical scenarios and the reconstruction of somatosensory-evoked potentials. Results: CutFEM outperforms competing FEM approaches with regard to numerical accuracy, memory consumption, and computational speed while being able to mesh arbitrarily touching compartments. Discussion: CutFEM balances numerical accuracy, computational efficiency, and a smooth approximation of complex geometries that has previously not been available in FEM-based EEG forward modeling.
Kokoelmat
- TUNICRIS-julkaisut [19236]