Image reconstruction by nonlinear Landweber iteration for complicated distributions

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    Abstract

    In electrical capacitance tomography (ECT), a sensitivity matrix is usually calculated based on high permittivity perturbation with a low permittivity background and a fixed sensitivity matrix is used for both one-step and linear iterative image reconstruction. This paper presents a nonlinear iterative method with the sensitivity matrix updated during the iterative process. Using an updated sensitivity matrix, both the forward and inverse problems can be solved more accurately than using a fixed sensitivity matrix. Some complicated distributions, including 'sun-rise', cross, T and V shapes, have been examined using an 8-electrode sensor, with both noise-free simulation data and real measurements. The results are promising. © 2008 IOP Publishing Ltd.
    Original languageEnglish
    Article number094014
    JournalMeasurement Science and Technology
    Volume19
    Issue number9
    DOIs
    Publication statusPublished - 1 Sep 2008

    Keywords

    • Electrical capacitance tomography (ECT)
    • Landweber
    • Sensitivity matrix

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