TY - JOUR
T1 - MEG forward problem formulation using equivalent surface current densities
AU - Von Ellenrieder, Nicolás
AU - Muravchik, Carlos H.
AU - Nehorai, Arye
N1 - Funding Information:
Manuscript received June 16, 2004; revised December 23, 2004. The work of N. von Ellenrieder was supported by Consejo Nacional de Investigaciones Científicas y Técnicas. The work of C. Muravchik was supported by Comisión de Investigaciones Científicas de la provincia de Buenos Aires. The work of A. Nehorai was supported by the National Science Foundation (NSF) under Grant CCR-0105334 and Grant CCR-0330342. Asterisk indicates corresponding author. *N. von Ellenrieder is with the Laboratorio de Electrónica Industrial, Control e Instrumentación, Departamento de Electrotecnia, Facultad de Ingeniería, Uni-versidad Nacional de La Plata, Argentina (e-mail: [email protected], ellenrie@ ing.unlp.edu.ar).
PY - 2005/7
Y1 - 2005/7
N2 - We present a formulation for the magnetoencephalography (MEG) forward problem with a layered head model. Traditionally the magnetic field is computed based on the electric potential on the interfaces between the layers. We propose to express the effect of the volumetric currents in terms of an equivalent surface current density on each interface, and obtain the magnetic field based on them. The boundary elements method is used to compute the equivalent current density and the magnetic field for a realistic head geometry. We present numerical results showing that the MEG forward problem is solved correctly with this formulation, and compare it with the performance of the traditional formulation. We conclude that the traditional formulation generally performs better, but still the new formulation is useful in certain situations.
AB - We present a formulation for the magnetoencephalography (MEG) forward problem with a layered head model. Traditionally the magnetic field is computed based on the electric potential on the interfaces between the layers. We propose to express the effect of the volumetric currents in terms of an equivalent surface current density on each interface, and obtain the magnetic field based on them. The boundary elements method is used to compute the equivalent current density and the magnetic field for a realistic head geometry. We present numerical results showing that the MEG forward problem is solved correctly with this formulation, and compare it with the performance of the traditional formulation. We conclude that the traditional formulation generally performs better, but still the new formulation is useful in certain situations.
KW - BEM
KW - Current density
KW - Forward problem
KW - MEG
UR - https://www.scopus.com/pages/publications/21844451645
U2 - 10.1109/TBME.2005.847549
DO - 10.1109/TBME.2005.847549
M3 - Article
C2 - 16041984
AN - SCOPUS:21844451645
SN - 0018-9294
VL - 52
SP - 1210
EP - 1217
JO - IEEE Transactions on Biomedical Engineering
JF - IEEE Transactions on Biomedical Engineering
IS - 7
ER -