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Generating accurate finite element meshes for the forward model of the human head in EIT

Tizzard, A; Horesh, L; Yerworth, RJ; Holder, DS; Bayford, RH; (2005) Generating accurate finite element meshes for the forward model of the human head in EIT. PHYSIOLOGICAL MEASUREMENT , 26 (2) S251 - S261. 10.1088/0967-3334/26/2/024.

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Abstract

The use of realistic anatomy in the model used for image reconstruction in EIT of brain function appears to confer significant improvements compared to geometric shapes such as a sphere. Accurate model geometry may be achieved by numerical models based on magnetic resonance images (MRIs) of the head, and this group has elected to use finite element meshing (FEM) as it enables detailed internal anatomy to be modelled and has the capability to incorporate information about tissue anisotropy. In this paper a method for generating accurate FEMs of the human head is presented where MRI images are manually segmented using custom adaptation of industry standard commercial design software packages. This is illustrated with example surface models and meshes from adult epilepsy patients, a neonatal baby and a phantom latex tank incorporating a real skull. Mesh quality is assessed in terms of element stretch and hence distortion.

Type:Article
Title:Generating accurate finite element meshes for the forward model of the human head in EIT
Location:Gdansk, POLAND
DOI:10.1088/0967-3334/26/2/024
Keywords:electrical impedance tomography, finite elements, surface modelling, solid modelling, ELECTRICAL-IMPEDANCE TOMOGRAPHY
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering

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