Acoustic Impedance Tomography: Two Reconstruction Procedures
Echography is a qualitative imaging technique. Grey levels are arbitrary, without any physical significance. Going further, i.e. attributing to each “pixel” a determined value of a determined parameter needs discussing the problem in physical terms, in inverse scattering terms. This is why the acoustic modelization problem is very important: it is necessary to have a good simple physical modelization, i.e. with the minimum number of parameters. We propose here a very synthetic formulation with only one explicit parameter: the Acoustic Impedance Profile, which is well adapted to backscattering. The non-linear 3-D inverse scattering problem has no solution. So we propose a linear approximation, by using a tomographic reconstruction procedure. A brief description of the advancement of the experimental system is given at the end of the paper.
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