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Effects of Head Model Inaccuracies on Regional Scalp and Skull Conductivity Estimation Using Real EIT Measurements

  • M. Fernández-Corazza
  • S. Turovets
  • P. Govyadinov
  • C. H. Muravchik
  • D. Tucker
Conference paper
Part of the IFMBE Proceedings book series (IFMBE, volume 54)

Abstract

we estimate the scalp and skull conductivities on two healthy adults, based on bounded (or parametric) Electri- cal Impedance Tomography (bEIT) measurements, and using current injection pairs of a high dense 128 sensor array. We compare the estimates obtained with three different electrode models: pointwise, volumetric, and the Complete Electrode Model (CEM). We also analyze the influence of the skull de- tails and the cerebrospinal fluid (CSF). The estimated scalp (skull) conductivities for these two subjects were ~0.4 and ~0.3 S/m (~0.0045 and ~0.005 S/m), similar for all three electrode models (within 8%). Volumetric and CEM models resulted in a better fit to real data. A model of nested and closed surfaces (no skull holes) resulted in a significant overestimation (~23%) of the skull conductivity. Moreover, neglecting the CSF result- ed in an extra 28% overestimation of the skull conductivity. This clearly shows the need of precise head modeling for bEIT.

Keywords

bounded electrical impedance tomography electrode modeling complete electrode model parametric estimation skull conductivity 

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Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  • M. Fernández-Corazza
    • 1
    • 2
    • 3
  • S. Turovets
    • 4
    • 5
  • P. Govyadinov
    • 6
  • C. H. Muravchik
    • 1
    • 7
  • D. Tucker
    • 4
    • 5
  1. 1.LEICI - Instituto de Electrónica, Control y Procesamiento de Señales, Facultad de Ingeniería, UNLPBuenos AiresArgentina
  2. 2.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Santa FeArgentina
  3. 3.Departamento de Ciencias Básicas, Facultad de IngenieríaUNLPBuenos AiresArgentina
  4. 4.NeuroInformatics CenterUniversity of OregonEugeneUSA
  5. 5.Electrical Geodesics Inc. (EGI)EugeneUSA
  6. 6.Electrical and Computer EngineeringUniversity of HustonHoustonUSA
  7. 7.Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICpBA)Buenos AiresArgentina

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