Non-invasive EEG source localization using particle swarm optimization: a clinical experiment.
One of the most important steps of pre-surgical diagnosis in patients with medically intractable epilepsy is to find the precise location of the epileptogenic foci. An Electroencephalography (EEG) is a non-invasive standard tool used at epilepsy surgery center for pre-surgical diagnosis. In this paper a modified particle swarm optimization (MPSO) method is applied to a real EEG data, i.e., a somatosensory evoked potentials (SEPs) measured from a healthy subject, to solve the EEG source localization problem. A high resolution 1 mm hexahedra finite element volume conductor model of the subject's head was generated using T1-weighted magnetic resonance imaging data. An exhaustive search pattern and the MPSO method were then applied to the peak of the averaged SEPs data. The non-invasive EEG source analysis methods localized the somatosensory cortex area where our clinical expert expected the received SEPs. The proposed inverse problem solver found the global minima with acceptable accuracy and reasonable number of iterations.
Department of Signals and Systems, Chalmers University of Technology and MedTechWest Center, Göteborg, Sweden. yazdan.shirvany@chalmers.se
Yazdan
Y
Shirvany
Fredrik
F
Edelvik
Stefan
S
Jakobsson
Anders
A
Hedström
Qaiser
Q
Mahmood
Artur
A
Chodorowski
Mikael
M
Persson
D004569:Electroencephalography / Q000379:methods*; D005073:Evoked Potentials, Somatosensory; D020342:Finite Element Analysis; D006801:Humans