Cited by 73Direction-of-Arrival Estimation TechniquesEEG and Brain-Computer InterfacesNumerical methods in inverse problems

An alternative subspace approach to EEG dipole source localization

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Xu, Xiao-Liang, Xu, Bobby, He, Bin·2004·Physics in Medicine and Biology

Abstract

In the present study, we investigate a new approach to electroencephalography (EEG) three-dimensional (3D) dipole source localization by using a non-recursive subspace algorithm called FINES. In estimating source dipole locations, the present approach employs projections onto a subspace spanned by a small set of particular vectors (FINES vector set) in the estimated noise-only subspace instead of the entire estimated noise-only subspace in the case of classic MUSIC. The subspace spanned by this vector set is, in the sense of principal angle, closest to the subspace spanned by the array manifold associated with a particular brain region. By incorporating knowledge of the array manifold in identifying FINES vector sets in the estimated noise-only subspace for different brain regions, the present approach is able to estimate sources with enhanced accuracy and spatial resolution, thus enhancing the capability of resolving closely spaced sources and reducing estimation errors. The present computer simulations show, in EEG 3D dipole source localization, that compared to classic MUSIC, FINES has (1) better resolvability of two closely spaced dipolar sources and (2) better estimation accuracy of source locations. In comparison with RAP-MUSIC, FINES' performance is also better for the cases studied when the noise level is high and/or correlations among dipole sources exist.

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  • RAP-MUSIC and FINE localization mitigate the correlation problem to a certain degree.

    “Variations of MUSIC, such as the recursively applied and projected MUSIC (RAP-MUSIC) (39) and the first principle vector (FINE) localization method (40), mitigate this problem to a certain degree.”

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Authors
Xu, X.-L., Xu, B., & He, B.
Affiliations
  • University of Illinois Chicago (US)
  • University of Minnesota (US)
ORCID
He, Bin
Venue
Physics in Medicine and Biology
Published
2004-01-05
Volume
49
Issue
2
Pages
327-343
ISSN
  • 0031-9155 (ISSN-L)
  • 1361-6560
OpenAlex
W2049466097
Cited by
73
References
36
Citations by year
2026: 1 · 2025: 2 · 2024: 1 · 2022: 2 · 2021: 4 · 2020: 2 · 2019: 4 · 2018: 6 · 2017: 3 · 2016: 2 · 2015: 4 · 2014: 1 · 2013: 4 · 2012: 8
FWCI
7.64
Type
journal article
Language
en
Open access
Locations
  • Physics in Medicine and Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (CAREER, 9875344, 0218736)
  • National Institutes of Health
  • National Institute of Biomedical Imaging and Bioengineering (R01-EB-00178, R01EB000178)
Topics
  • Physical Sciences › Computer Science › Signal Processing › Direction-of-Arrival Estimation Techniques
  • Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
  • Physical Sciences › Mathematics › Mathematical Physics › Numerical methods in inverse problems
Keywords
MUSIC algorithm, array manifold, spatial resolution, rap music
MeSH terms
Algorithms, Brain, Brain Mapping, Computer Simulation, Electroencephalography, Genetic Vectors, Humans, Image Processing, Computer-Assisted, Models, Neurological, Music, Software, Time Factors, Reproducibility of Results, Models, Statistical, Normal Distribution

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