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**Harvard**

Rubaek, T., Meaney, P. och Paulsen, K. (2011) *A Contrast Source Inversion Algorithm Formulated Using the Log-Phase Formulation*.

** BibTeX **

@article{

Rubaek2011,

author={Rubaek, Tonny and Meaney, P. and Paulsen, K. D.},

title={A Contrast Source Inversion Algorithm Formulated Using the Log-Phase Formulation},

journal={International Journal of Antennas and Propagation},

issn={1687-5869},

abstract={The contrast source inversion (CSI) algorithm was introduced for microwave imaging in 1997 and has since proven to be one of the most successful algorithms for nonlinear microwave tomography. In the CSI algorithm, the nonlinear integral equation, which must be solved to extract the constitutive electromagnetic parameters of the object under test from the microwave measurements, is represented by two linear equations, known as the data and the object equations. In this paper, the data equation in the CSI algorithm is reformulated using the so-called log-phase formulation. In this formulation, the measured data is represented by the change in the logarithm of the amplitude and the change in the unwrapped phase. This formulation has previously been applied for nonlinear tomography within the framework of a Gauss-Newton based algorithm for detection of breast cancer. Here, significant improvements have been observed compared to the more commonly used real-imaginary formulation. The modified CSI algorithm is tested on both simulated data and on a measurement of a breast. It is shown that for imaging setups with large differences in the measured signals, the new formulation of the data equation significantly improves the performance of the CSI algorithm.},

year={2011},

keywords={initial clinical-experience, dielectric-properties, nonlinear inversion, microwave, tissues, women },

}

** RefWorks **

RT Journal Article

SR Electronic

ID 156553

A1 Rubaek, Tonny

A1 Meaney, P.

A1 Paulsen, K. D.

T1 A Contrast Source Inversion Algorithm Formulated Using the Log-Phase Formulation

YR 2011

JF International Journal of Antennas and Propagation

SN 1687-5869

AB The contrast source inversion (CSI) algorithm was introduced for microwave imaging in 1997 and has since proven to be one of the most successful algorithms for nonlinear microwave tomography. In the CSI algorithm, the nonlinear integral equation, which must be solved to extract the constitutive electromagnetic parameters of the object under test from the microwave measurements, is represented by two linear equations, known as the data and the object equations. In this paper, the data equation in the CSI algorithm is reformulated using the so-called log-phase formulation. In this formulation, the measured data is represented by the change in the logarithm of the amplitude and the change in the unwrapped phase. This formulation has previously been applied for nonlinear tomography within the framework of a Gauss-Newton based algorithm for detection of breast cancer. Here, significant improvements have been observed compared to the more commonly used real-imaginary formulation. The modified CSI algorithm is tested on both simulated data and on a measurement of a breast. It is shown that for imaging setups with large differences in the measured signals, the new formulation of the data equation significantly improves the performance of the CSI algorithm.

LA eng

DO 10.1155/2011/849894

LK http://dx.doi.org/10.1155/2011/849894

LK http://publications.lib.chalmers.se/records/fulltext/local_156553.pdf

OL 30