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Dipole estimation errors in EEG source localization due to not incorporating anisotropic conductivities of white matter in realistic head models

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Abstract
The electroencephalogram (EEG) is a useful tool in the diagnosis of epilepsy. EEG source localization can provide neurologists with an estimation of the epileptogenic zone. Many EEG source localization approaches assume head models with isotropic conductivity, while in reality the conductivity of white matter is anisotropic. The conductivity along the nerve bundle is higher than the conductivity perpendicular to the nerve bundle. Using diffusion weighted magnetic resonance images (DW-MRI), we can determine the directions the anisotropic diffusion. Using the latter we can derive the anisotropic conductivity tensor. These anisotropic conductivities can be fused with the realistic head model, derived from MR images. Using a grid of dipoles, placed in white and grey matter regions, we can compare the head model with white matter anisotropy with a head model with isotropic conductivity for the white matter compartment. As quantification measures we used the dipole location and orientation error. Results show that the location error was very small in both white and grey matter regions (< 5 mm). The dipole orientation error had a mean of 3.8 degrees and 6.1 degrees in grey and white matter regions. This would indicate that the systematical error due to not incorporating anisotropic conductivities of white matter is very small.
Keywords
anisotropie, EEG bronlokalisatie

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Please use this url to cite or link to this publication:

MLA
Hallez, Hans, Bart Vanrumste, Steven Delputte, et al. “Dipole Estimation Errors in EEG Source Localization Due to Not Incorporating Anisotropic Conductivities of White Matter in Realistic Head Models.” 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING. New York, NY, USA: IEEE, 2007. 51–54. Print.
APA
Hallez, H., Vanrumste, B., Delputte, S., Van Hese, P., Assecondi, S., D’Asseler, Y., & Lemahieu, I. (2007). Dipole estimation errors in EEG source localization due to not incorporating anisotropic conductivities of white matter in realistic head models. 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING (pp. 51–54). Presented at the Joint Meeting of the 6th Symposium on Noninvasive Functional Source Imaging of the Brain and Heart / International Conference on Functional Biomedical Imaging, New York, NY, USA: IEEE.
Chicago author-date
Hallez, Hans, Bart Vanrumste, Steven Delputte, Peter Van Hese, Sara Assecondi, Yves D’Asseler, and Ignace Lemahieu. 2007. “Dipole Estimation Errors in EEG Source Localization Due to Not Incorporating Anisotropic Conductivities of White Matter in Realistic Head Models.” In 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING, 51–54. New York, NY, USA: IEEE.
Chicago author-date (all authors)
Hallez, Hans, Bart Vanrumste, Steven Delputte, Peter Van Hese, Sara Assecondi, Yves D’Asseler, and Ignace Lemahieu. 2007. “Dipole Estimation Errors in EEG Source Localization Due to Not Incorporating Anisotropic Conductivities of White Matter in Realistic Head Models.” In 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING, 51–54. New York, NY, USA: IEEE.
Vancouver
1.
Hallez H, Vanrumste B, Delputte S, Van Hese P, Assecondi S, D’Asseler Y, et al. Dipole estimation errors in EEG source localization due to not incorporating anisotropic conductivities of white matter in realistic head models. 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING. New York, NY, USA: IEEE; 2007. p. 51–4.
IEEE
[1]
H. Hallez et al., “Dipole estimation errors in EEG source localization due to not incorporating anisotropic conductivities of white matter in realistic head models,” in 2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING, Hangzhou, PR China, 2007, pp. 51–54.
@inproceedings{416838,
  abstract     = {The electroencephalogram (EEG) is a useful tool in the diagnosis of epilepsy. EEG source localization can provide neurologists with an estimation of the epileptogenic zone. Many EEG source localization approaches assume head models with isotropic conductivity, while in reality the conductivity of white matter is anisotropic. The conductivity along the nerve bundle is higher than the conductivity perpendicular to the nerve bundle. Using diffusion weighted magnetic resonance images (DW-MRI), we can determine the directions the anisotropic diffusion. Using the latter we can derive the anisotropic conductivity tensor. These anisotropic conductivities can be fused with the realistic head model, derived from MR images. Using a grid of dipoles, placed in white and grey matter regions, we can compare the head model with white matter anisotropy with a head model with isotropic conductivity for the white matter compartment. As quantification measures we used the dipole location and orientation error. Results show that the location error was very small in both white and grey matter regions (< 5 mm). The dipole orientation error had a mean of 3.8 degrees and 6.1 degrees in grey and white matter regions. This would indicate that the systematical error due to not incorporating anisotropic conductivities of white matter is very small.},
  author       = {Hallez, Hans and Vanrumste, Bart and Delputte, Steven and Van Hese, Peter and Assecondi, Sara and D'Asseler, Yves and Lemahieu, Ignace},
  booktitle    = {2007 JOINT MEETING OF THE 6TH INTERNATIONAL SYMPOSIUM ON NONINVASIVE FUNCTIONAL SOURCE IMAGING OF THE BRAIN AND HEART AND THE INTERNATIONAL CONFERENCE ON FUNCTIONAL BIOMEDICAL IMAGING},
  isbn         = {978-1-4244-0948-8},
  keywords     = {anisotropie,EEG bronlokalisatie},
  language     = {eng},
  location     = {Hangzhou, PR China},
  pages        = {51--54},
  publisher    = {IEEE},
  title        = {Dipole estimation errors in EEG source localization due to not incorporating anisotropic conductivities of white matter in realistic head models},
  url          = {http://dx.doi.org/10.1109/NFSI-ICFBI.2007.4387695},
  year         = {2007},
}

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