Solution of the nonlinear inverse scattering problem by T-matrix completion. I. Theory
Résumé
We propose a conceptually different method for solving nonlinear inverse scattering problems (ISPs) such as
are commonly encountered in tomographic ultrasound imaging, seismology, and other applications. The method
is inspired by the theory of nonlocality of physical interactions and utilizes the relevant formalism.We formulate
the ISP as a problem whose goal is to determine an unknown interaction potential V from external scattering
data. Although we seek a local (diagonally dominated) V as the solution to the posed problem, we allow V to be
nonlocal at the intermediate stages of iterations. This allows us to utilize the one-to-one correspondence between
V and the T matrix of the problem. Here it is important to realize that not every T corresponds to a diagonal V
and we, therefore, relax the usual condition of strict diagonality (locality) of V . An iterative algorithm is proposed
in which we seek T that is (i) compatible with the measured scattering data and (ii) corresponds to an interaction
potential V that is as diagonally dominated as possible. We refer to this algorithm as to the data-compatible
T -matrix completion. This paper is Part I in a two-part series and contains theory only. Numerical examples of
image reconstruction in a strongly nonlinear regime are given in Part II [H.W. Levinson and V. A. Markel, Phys.
Rev. E 94, 043318 (2016)]. The method described in this paper is particularly well suited for very large data sets
that become increasingly available with the use of modern measurement techniques and instrumentation.
Domaines
Optique [physics.optics]Origine | Fichiers produits par l'(les) auteur(s) |
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