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Image Reconstruction using Modified Iterative Landweber Method in Electrical Impedance Tomography  

Kim, Bong-Seok (Institute for Nuclear Science and Technology, Jeju National University)
Kim, Ji-Hoon (Dept. of Electronic Engineering, Kyungpook National University)
Kim, Sin (Dept. of Nuclear and Energy Engineering, Jeju National University)
Kim, Kyung-Youn (Dept. of Electronic Engineering, Jeju National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.49, no.4, 2012 , pp. 36-44 More about this Journal
Abstract
Electrical impedance tomography is a relatively new imaging modality in which the internal conductivity (or resistivity) distribution of a object is reconstructed based on the injected currents and measured voltages through the electrodes placed on the surface of the object. In this paper, it is assumed that the relationship between the resistivity distribution and the resistance of electrodes is linear. From this linear relation, the weighting matrix can be obtained and modified iterative Landweber method is applied to estimate the internal resistivity distribution. Additionally, to accelerate the convergence rate and improve the spatial resolution of the reconstructed image, optimal step lengths for the iterative Landweber method are computed from the objective function in the least-square sense. The numerical experiments have been performed to illustrate the superior reconstruction performance of the proposed scheme.
Keywords
Electrical impedance tomography; Landweber method; image reconstruction;
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