Artificial boundary conditions and domain truncation in electrical impedance tomography. Part I: Theory and preliminary results

Daniela  Calvetti; Paul J.  Hadwin; Janne M. J.  Huttunen; David  Isaacson; Jari P.  Kaipio; Debra  McGivney; Erkki  Somersalo; Joseph  Volzer

doi:10.3934/ipi.2015.9.749

Article Contents

2015, Volume 9, Issue 3: 749-766. Doi: 10.3934/ipi.2015.9.749

This issue Previous Article The perturbation of transmission eigenvalues for inhomogeneous media in the presence of small penetrable inclusions Next Article Artificial boundary conditions and domain truncation in electrical impedance tomography. Part II: Stochastic extension of the boundary map

Artificial boundary conditions and domain truncation in electrical impedance tomography. Part I: Theory and preliminary results

1.
Case Western Reserve University, Department of Mathematics, Applied Mathematics, and Statistics, Cleveland, OH 44106
2.
University of Auckland, Department of Mathematics, Auckland
3.
University of Eastern Finland, Department of Applied Physics, Kuopio
4.
Rensselaer Polytechnic Institute, Department of Mathematics, Troy, NY 12180
5.
Case Western Reserve University, Department of Radiology, Cleveland, OH 44106

Received: April 2014

Revised: January 2015

Published: August 2015

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Abstract

Artificial boundary conditions have long been an active research topic in numerical approximation of scattering waves: The truncation of the computational domain and the assignment of the conditions along the fictitious boundary must be done so that no spurious reflections occur. In inverse boundary value problems, a similar problem appears when the estimation of the unknowns is restricted to a domain that represents the whole domain of the solutions of a partial differential equation with unknown coefficient. This problem is significantly more challenging than general scattering problems, because the coefficients representing the unknown material parameter of interest are not known in the truncated portion and assigning suitable condition on the fictitious boundary is part of the problem also. The problem is addressed by defining a Dirichlet-to-Neumann map, or Steklov-Poincaré map, on the boundary of the domain truncation. In this paper we describe the procedure, provide a theoretical justification and illustrate with computed examples the limitations of imposing fixed boundary condition. Extensions of the proposed approach will be presented in a sequel article.

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Mathematics Subject Classification: Primary: 35J20, 35R30, 65M32, 65M55.

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