INVESTIGADORES
FERNANDEZ CORAZZA Mariano
congresos y reuniones científicas
Título:
Effects of Head Model Inaccuracies on Regional Scalp and Skull Conductivity Estimation Using Real EIT Measurements
Autor/es:
MARIANO FERNÁNDEZ CORAZZA; SERGEI TUROVETS; PAVEL GOVYADINOV; CARLOS MURAVCHIK; DON TUCKER
Lugar:
Montevideo
Reunión:
Conferencia; II Latin American Conference on Bioimpedance - CLABIO2015; 2015
Institución organizadora:
Universidad de La República, Montevideo, Uruguay
Resumen:
Abstract:We estimate the scalp and skull conductivities on two healthy adults, based on bounded (or parametric) Electrical Impedance Tomography (bEIT) measurements, and using 62 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 details 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 resulted in an extra 28% overestimation of the skull conductivity. This clearly shows the need of precise head modeling for bEIT.
