Edge-enhancing reconstruction algorithm for three-dimensional electrical impedance tomography

Lauri Oskari Harhanen, N. Hyvönen, H. Majander, S. Staboulis

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Electrical impedance tomography is an imaging modality for extracting information on the conductivity distribution inside a physical body from boundary measurements of current and voltage. In many practical applications, it is a priori known that the conductivity consists of embedded inhomogeneities in an approximately constant background. This work introduces an iterative reconstruction algorithm that aims at finding the maximum a posteriori estimate for the conductivity assuming an edge-preferring prior. The method is based on applying (a single step of) priorconditioned lagged diffusivity iteration to sequential linearizations of the forward model. The algorithm is capable of producing reconstructions on dense unstructured three-dimensional finite element meshes and with a high number of measurement electrodes. The functionality of the proposed technique is demonstrated with both simulated and experimental data in the framework of the complete electrode model, which is the most accurate model for practical impedance tomography.
Original languageEnglish
JournalS I A M Journal on Scientific Computing
Volume37
Issue number1
Pages (from-to)B60-B78
ISSN1064-8275
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Electrical impedance tomography
  • Priorconditioning
  • Edge-preferring regularization
  • LSQR
  • Complete electrode model

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