RESEARCH ARTICLE
Effects of Head Models and Dipole Source Parameters on EEG Fields
Li Peng *, 1, Mingming Peng 2, Anhuai Xu 3
Article Information
Identifiers and Pagination:
Year: 2015Volume: 9
First Page: 10
Last Page: 16
Publisher ID: TOBEJ-9-10
DOI: 10.2174/1874120701509010010
Article History:
Received Date: 1/9/2014Revision Received Date: 12/10/2014
Acceptance Date: 30/10/2014
Electronic publication date: 27 /2/2015
Collection year: 2015
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
Abstract
Head model and an efficient method for computing the forward EEG (electroencephalography)problem are essential to dipole source localization(DSL). In this paper, we use less expensive ovoid geometry to approximate human head, aiming at investigating the effects of head shape and dipole source parameters on EEG fields. The application of point least squares (PLS) based on meshless method was introduced for solving EEG forward problem and numerical simulation is implemented in three kinds of ovoid head models. We present the performances of the surface potential in the face of varying dipole source parameters in detail. The results show that the potential patterns are similar for different dipole position in different head shapes, but the peak value of potential is significantly influenced by the head shape. Dipole position induces a great effect on the peak value of potential and shift of peak potential. The degree of variation between sphere head model and non-sphere head models is seen at the same time. We also show that PLS method with the trigonometric basis is superior to the constant basis, linear basis, and quadratic basis functions in accuracy and efficiency.
