Effects of anisotropy in a physical torso phantom on source reconstructions from a current dipole
Date
2007-01-03
Journal Title
Journal ISSN
Volume Title
Publisher
Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging
Abstract
In this study, we investigated experimentally the
influence of anisotropic compartments on source reconstruction
using phantom measurements with an artificial current dipole as
signal source. The anisotropic compartment was built from single
skeins with a nine times higher conductivity than the surrounding
solution. We placed the dipole at the lower borders of the
anisotropic bulk and measured the magnetic field and the electric
potential for each dipole location. The current dipole was rotated
in relation to the anisotropic skeins and potentials and fields were
recorded for different angles between anisotropic skeins and
current dipole. We found that the estimated dipole orientations
are strongly influenced by the anisotropy, while the reconstructed
position of the dipole is not significantly influenced. We conclude
that for bioelectric and biomagnetic source reconstruction, it is
necessary to take into account anisotropic structures in the
volume conductor if dipole orientations are of interest.
Description
Keywords
electrical & electronics engineering