Conference paper
Nonlinear 3-D Microwave Imaging for Breast-Cancer Screening: Log, Phase, and Log-Phase Formulation
The imaging algorithm used in the 3-D microwave imaging system for breast cancer screening, currently being developed at the Technical University of Denmark, is based on an iterative Newton-type algorithm. In this algorithm, the distribution of the electromagnetic constitutive parameters is updated in each iteration based on a comparison between the measured signals and the signals computed by a forward solver for the current parameter distribution.
A key feature of the algorithm is the use of the log-phase formulation in which the measured complex signals are represented by the logarithm of their amplitudes and their unwrapped phases. In this paper, simplifications of the log-phase formulation are proposed, namely the log formulation, in which only the logarithm of the amplitudes are used, and the phase formulation, in which only the unwrapped phases are used.
These formulations allow for the use of simpler tomographic systems in which only the amplitudes or the phases of the signals are measured. The performance of the algorithms using the two proposed formulations is investigated by reconstructing images of data collected with the above-mentioned imaging system, and the resulting images are compared with those obtained using the log-phase formulation.
Language: | English |
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Publisher: | IEEE |
Year: | 2011 |
Pages: | 1-4 |
Proceedings: | 2011 Loughborough Antennas & Propagation Conference |
Journal subtitle: | Lapc 2011 |
ISBN: | 1457710145 , 9781457710148 , 1457710153 , 1457710161 , 9781457710155 and 9781457710162 |
Types: | Conference paper |
DOI: | 10.1109/LAPC.2011.6114124 |
ORCIDs: | Zhurbenko, Vitaliy |
Antenna measurements Conductivity Image reconstruction Imaging Permittivity Phase measurement SDG 3 - Good Health and Well-being Vectors
Newton method Technical University of Denmark amplitude logarithm breast-cancer screening cancer electromagnetic constitutive parameters image reconstruction image representation iterative Newton-type algorithm log-phase formulation medical image processing microwave imaging nonlinear 3D microwave imaging system parameter distribution signal representation tomographic systems unwrapped-phase logarithm