NDLI: Comparison of different auto-solid angle approximations in BEM for EEG dipole source localization

Content Provider	IEEE Xplore Digital Library
Author	Assecondi, S. Hallez, H. D'Asseler, Y. Lemahieu, I.
Copyright Year	2007
Abstract	The solution of the forward problem in electroencephalography requires the computation of the potential distribution on the surface of an isolated conductor, generated by a known source. In order to solve the problem in realistic head-shaped conductors, numerical methods must be used, such as boundary element method (BEM). In the BEM the surface of the volume conductor is subdivided in triangles and the potential is calculated at the centres of gravity, or collocation points, of these triangles. Key to the BEM is the estimation of the solid angle subtended by a triangle at a given collocation point. Particular care must be taken when considering the auto-solid angle, i.e. the solid angle subtended by a triangle at a point which belongs to that triangle. In this work we investigate the effect of the number of collocation points and we compare different approximations of the auto-solid angle commonly used in literature by means of the relative difference measure (RDM). We found that the finer the tessellation the smaller the median RDM and the narrower the distribution of RDM values. Moreover, we found that the use of the "one solid angle" approximation clearly outperforms the other approximations in terms of RDM.
Starting Page	70
Ending Page	73
File Size	175753
Page Count	4
File Format	PDF
ISBN	9781424409488
DOI	10.1109/NFSI-ICFBI.2007.4387690
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-12
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scalp Boundary element methods Conductivity Conductors Solids Electroencephalography Conducting materials Distributed computing Gravity Information systems
Content Type	Text
Resource Type	Article

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