Propagation of singularities for linearised hybrid data impedance tomography

Guillaume Bal, Kristoffer Hoffmann, Kim Knudsen

Research output: Contribution to journalJournal articleResearchpeer-review


For a general formulation of linearised hybrid inverse problems in impedance tomography, the qualitative properties of the solutions are analysed. Using an appropriate scalar pseudo-differential formulation, the problems are shown to permit propagating singularities under certain non-elliptic conditions, and the associated directions of propagation are precisely identified relative to the directions in which ellipticity is lost. The same result is found in the setting for the corresponding normal formulation of the scalar pseudo-differential equations. A numerical reconstruction procedure based of the least squares finite element method is derived, and a series of numerical experiments visualise exactly how the loss of ellipticity manifests itself as propagating singularities.
Original languageEnglish
Article number024001
JournalInverse Problems
Issue number2
Number of pages19
Publication statusPublished - 2017


  • Hybrid data
  • Reconstruction algorithm
  • Impedance tomography
  • Coupled physics tomograhy
  • Ultrasound modulated EIT
  • Acousto-electric tomography


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