A hybrid strategy for acousto-electric tomography based on a complete electrode model

Abstract : In acousto-electric tomography (AET), the electrical conductivity distribution in a domain of interest (DOI) is retrieved from power density data obtained from the perturbation of a focused ultrasonic wave. Yet this power density cannot be measured directly. One has to retrieve it from the potential on the entire boundary of the DOI, which is not practical. A new hybrid reconstruction strategy, working with the complete electrode model (CEM), is proposed, based on the fact that the boundary measurements are not very sensitive to the interior change of conductivity in electrical impedance tomography (EIT). Boundary potentials are first obtained from EIT measurements with and without the perturbation due to the focused ultrasonic wave. Then, these potentials can be used to retrieve the power densities, from which the conductivity distribution in the DOI follows. A method based on singular-value-decomposition (SVD) is applied to get the boundary potentials and the conductivity distribution, the latter serving as initial guess of a Levenberg- Marquardt solution method to retrieve it with a higher level of accuracy. Numerical simulations are carried out with the above strategy and its accuracy and efficiency are illustrated.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-02200484
Contributor : Dominique Lesselier <>
Submitted on : Wednesday, July 31, 2019 - 10:44:06 AM
Last modification on : Friday, August 2, 2019 - 2:23:37 AM

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  • HAL Id : hal-02200484, version 1

Citation

Changyou Li, Kang An, Kuisong Zheng, Dominique Lesselier. A hybrid strategy for acousto-electric tomography based on a complete electrode model. 2019. ⟨hal-02200484⟩

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