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Influence of Realistic Head Modeling on EEG Forward Problem

  • Ernesto Cuartas Morales
  • Yohan Ricardo Céspedes Villar
  • Héctor Fabio Torres Cardona
  • Carlos Daniel Acosta
  • German Castellanos Dominguez
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11309)

Abstract

We study the influence of realistic head modeling on the EEG forward problem. To this end, we define a high-resolution patient-specific realistic head model from 3T-MRI and DWI data. Further, we performed a nine tissues segmentation and a white matter anisotropy estimation. Then we solve the forward problem using a state-of-the-art FDM solution that allows volumetric voxelwise anisotropic definition in a reciprocity sensors space. Finally, we compared the 9-tissues realistic head model against the commonly used 5-tissues isotropic representation. Our results show significant potential deviations due to the white matter anisotropy, and radio to tangential patterns in the outer skull regions as a direct effect of essential tissues like fat or muscle. Moreover, we analyze the dipole estimation errors in a parametric inverse setup, finding DLE’s larger than 20 mm. Additionally, we study the influence of neglecting the blood vessels, finding DLE’s larger than 4 mm in deep brain areas.

Keywords

Forward modeling Conductivity anisotropy Finite differences 

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Ernesto Cuartas Morales
    • 1
  • Yohan Ricardo Céspedes Villar
    • 2
  • Héctor Fabio Torres Cardona
    • 3
  • Carlos Daniel Acosta
    • 1
  • German Castellanos Dominguez
    • 1
  1. 1.Signal Processing and Recognition GroupUniversidad Nacional de Colombia, Km 9 Vía al Aeropuerto la Nubia, Manizales, ColombiaManizalesColombia
  2. 2.Centro de Bioinformática y Biología Computacional de Colombia - BIOSBogotaColombia
  3. 3.Universidad de CaldasManizalesColombia

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