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The direct MEG problem in the presence of an ellipsoidal shell inhomogeneity
Author(s):
George
Dassios;
Fotini
Kariotou
Journal:
Quart. Appl. Math.
63
(2005),
601-618.
MSC (2000):
Primary 78M99, 35QXX
Posted:
July 26, 2005
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Abstract:
The forward problem of Magnetoencephalography for an ellipsoidal inhomogeneous shell-model of the brain is considered. The inhomogeneity enters through a confocal ellipsoidal shell exhibiting different conductivity than the one of the brain tissue. It is shown that, as far as the leading quadrupolic moment of the exterior magnetic field is concerned, the complicated expression associated with the field itself is the same as in the homogeneous case, while the effect of the shell is focused on the form of the generalized dipole moment. In contrast to the spherical case, where no shell inhomogeneities are ``readable'' outside the skull, the ellipsoidal shells establish their existence on the exterior magnetic induction field in a way that depends not only on the geometry but also on the conductivity of the shell. The degenerated spherical results are fully recovered.
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Additional Information:
George
Dassios
Affiliation:
Division of Applied Mathematics, Department of Chemical Engineering, University of Patras, and ICEHT/FORTH
Fotini
Kariotou
Affiliation:
Division of Applied Mathematics, Department of Chemical Engineering, University of Patras, and Hellenic Open University
PII:
S0033-569X-05-00971-2
Received by editor(s):
August 13, 2004
Posted:
July 26, 2005
Copyright of article:
Copyright
2005,
Brown University
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