title: Electrical impedance tomography using induced and injected currents.
abstract: A two-dimensional forward problem formulation is introduced for electrical impedance tomography (EIT) using induced currents. The forward problem is linearised around a certain resistivity distribution and the inverse problem is formulated as a solution of a linear system of equations. Sensitivity of boundary measurements to resistivity variations are analysed for spatially uniform, linear and quadratic fields. The formulation, however, is suitable for studying the effects of a general magnetic field applied to induce the currents in the conductive object. A similar inverse problem formulation is also developed for EIT using injected currents. Simulation studies are performed by reconstructing images of a simulation distribution using both methods separately with generalised inversion. It is also shown that the derived formulations for the inverse problems of the two methods can be combined to solve a larger set of equations with a greater number of independent measurements.
authors.affiliation: Electrical and Electronics Engineering, Middle East Technical University, Ankara, Turkey.
authors.forename: N G
authors.initials: NG
authors.lastname: Gençer
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Ider
authors.forename: M
authors.initials: M
authors.lastname: Kuzuoglu
mesh_terms: D004553:Electric Conductivity; D006801:Humans; D008433:Mathematics; D014054:Tomography / Q000379:methods*