Title :
Reconstruction of the anisotropic complex conductivity distribution of a human thigh in three dimensions
Author :
Wagner, B. ; Hollaus, K. ; Magele, Ch ; Stollberger, R.
Author_Institution :
Inst. for Fundamentals & Theor. in Electr. Eng., Graz Univ. of Technol.
fDate :
4/1/2006 12:00:00 AM
Abstract :
In electric impedance tomography (EIT), a set of electrodes measures surface potentials resulting from known currents injected into the target region. Using a correct model of the target region, these potentials can be simulated very accurately, too. Since injected currents spread out in three dimensions, simulations in three dimensions are inevitable. In addition, the anisotropic nature of electric material properties of biological tissue should not be neglected to obtain appropriate results. The aim of this work is to reconstruct the anisotropic complex conductivity distribution of a human thigh. "Pseudomeasurements" making up for EIT data were available. A finite element model of a human thigh based on magnetic resonance images was generated. A classical Gauss-Newton algorithm with regularization was used to match the real material values and the ones fed into the simulation. Results for a simple, but unrealistic isotropic case as well as for a complicated anisotropic case are presented and discussed
Keywords :
bioelectric potentials; biological tissues; biomedical electrodes; electric impedance imaging; finite element analysis; magnetic anisotropy; anisotropic complex conductivity distribution; anisotropic nature; biological tissue; classical Gauss-Newton algorithm; electric impedance tomography; electric material properties; finite element model; human thigh; magnetic resonance images; surface potential measurement; Anisotropic magnetoresistance; Biological system modeling; Conductivity; Current measurement; Electrodes; Humans; Image reconstruction; Surface impedance; Thigh; Tomography; Anisotropy; complex conductivity; electrical impedance tomography; reconstruction;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.872009