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.
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© 2016 Springer Science+Business Media Singapore
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Fernández-Corazza, M., Turovets, S., Govyadinov, P., Muravchik, C.H., Tucker, D. (2016). Effects of Head Model Inaccuracies on Regional Scalp and Skull Conductivity Estimation Using Real EIT Measurements. In: Simini, F., Bertemes-Filho, P. (eds) II Latin American Conference on Bioimpedance. IFMBE Proceedings, vol 54. Springer, Singapore. https://doi.org/10.1007/978-981-287-928-8_2
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DOI: https://doi.org/10.1007/978-981-287-928-8_2
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Online ISBN: 978-981-287-928-8
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