Improving the performance of linear inverse solutions by inverting the resolution matrix

Details

Serval ID
serval:BIB_85649A5C0B5B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Improving the performance of linear inverse solutions by inverting the resolution matrix
Journal
IEEE Transactions on Biomedical Engineering
Author(s)
de Peralta Menendez  R. G., Murray  M. M., Andino  S. L.
ISSN
0018-9294
Publication state
Published
Issued date
09/2004
Peer-reviewed
Oui
Volume
51
Number
9
Pages
1680-3
Notes
Evaluation Studies
Journal Article
Research Support, Non-U.S. Gov't
Validation Studies --- Old month value: Sep
Abstract
This paper proposes a new strategy for improving the localization capabilities of linear inverse solutions, based on the relationship between the real solution and the estimated solution as described by the resolution matrix equation. Specifically, we present two alternatives based on either the partial or total inversion of the resolution matrix and applied them to the minimum norm solution, which is known for its poor performance in three-dimensional (3-D) localization problems. The minimum norm transformed inverse showed a clear improvement in 3-D localization. The strong dependence of localization errors with the eccentricity of the sources, characteristic of this solution, disappears after the proposed transformation. A similar effect is illustrated, using a realistic example where multiple generators at striate areas are active. While the original minimum norm incorrectly places the generators at extrastriate cortex, the transformed minimum norm localizes, for the example considered, the sources at their correct eccentricity with very low spatial blurring.
Keywords
*Algorithms Brain/*physiology Brain Mapping/*methods Computer Simulation Diagnosis, Computer-Assisted/*methods Electroencephalography/*methods Head/*physiology Humans Linear Models *Models, Neurological Reproducibility of Results Sensitivity and Specificity
Pubmed
Create date
21/01/2008 11:23
Last modification date
20/08/2019 15:44
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