Computational framework for applying electrical impedance tomography to head imaging

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-01-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
27
B1034-B1060
Series
SIAM Journal on Scientific Computing, Volume 41, issue 5
Abstract
This work introduces a computational framework for applying absolute electrical impedance tomography to head imaging without accurate information on the head shape or the electrode positions. A library of 50 heads is employed to build a principal component model for the typical variations in the shape of the human head, which leads to a relatively accurate parametrization for head shapes with only a few free parameters. The estimation of these shape parameters and the electrode positions is incorporated in a regularized Newton-type output least squares reconstruction algorithm. The presented numerical experiments demonstrate that strong enough variations in the internal conductivity of a human head can be detected by absolute electrical impedance tomography even if the geometric information on the measurement configuration is incomplete to an extent that is to be expected in practice.
Description
Keywords
Computational head model, Detection of stroke, Electrical impedance tomography, Inaccurate measurement model, Principal components, Shape derivatives
Other note
Citation
Candiani , V , Hannukainen , A & Hyvonen , N 2019 , ' Computational framework for applying electrical impedance tomography to head imaging ' , SIAM Journal on Scientific Computing , vol. 41 , no. 5 , pp. B1034-B1060 . https://doi.org/10.1137/19M1245098