Oran, O. F.Ider, Y. Z.2016-02-082016-02-082012-07-270031-9155http://hdl.handle.net/11693/21361Most algorithms for magnetic resonance electrical impedance tomography (MREIT) concentrate on reconstructing the internal conductivity distribution of a conductive object from the Laplacian of only one component of the magnetic flux density (∇ 2B z) generated by the internal current distribution. In this study, a new algorithm is proposed to solve this ∇ 2B z-based MREIT problem which is mathematically formulated as the steady-state scalar pure convection equation. Numerical methods developed for the solution of the more general convectiondiffusion equation are utilized. It is known that the solution of the pure convection equation is numerically unstable if sharp variations of the field variable (in this case conductivity) exist or if there are inconsistent boundary conditions. Various stabilization techniques, based on introducing artificial diffusion, are developed to handle such cases and in this study the streamline upwind Petrov-Galerkin (SUPG) stabilization method is incorporated into the Galerkin weighted residual finite element method (FEM) to numerically solve the MREIT problem. The proposed algorithm is tested with simulated and also experimental data from phantoms. Successful conductivity reconstructions are obtained by solving the related convection equation using the Galerkin weighted residual FEM when there are no sharp variations in the actual conductivity distribution. However, when there is noise in the magnetic flux density data or when there are sharp variations in conductivity, it is found that SUPG stabilization is beneficial.EnglishArtificial diffusionConductivity distributionsConvection-diffusion equationsCurrent distributionExperimental dataField variablesFinite element method FEMGalerkinLaplaciansMagnetic resonance electrical impedance tomographiesPetrov-GalerkinPure convectionStabilization methodsStabilization techniquesWeighted residualsAlgorithmsElectric impedanceElectric impedance tomographyFinite element methodGalerkin methodsMagnetic fluxMagnetic resonanceStabilizationArticleDiffusionFinite element analysisImage qualityImpedanceInstrumentationMethodologyNuclear magnetic resonance imagingTemperatureTomographyDiffusionElectric impedanceFinite element analysisMagnetic resonance imagingPhantomsTemperatureTomographyArticle10.1088/0031-9155/57/16/5113