TY - GEN

T1 - Nonlinear 3-D Microwave Imaging for Breast-Cancer Screening: Log, Phase, and Log-Phase Formulation

A1 - Jensen,Peter Damsgaard

A1 - Rubæk,Tonny

A1 - Mohr,Johan Jacob

A1 - Zhurbenko,Vitaliy

AU - Jensen,Peter Damsgaard

AU - Rubæk,Tonny

AU - Mohr,Johan Jacob

AU - Zhurbenko,Vitaliy

PB - IEEE

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Phase measurement

KW - Conductivity

KW - Vectors

KW - Antenna measurements

KW - Imaging

KW - Image reconstruction

KW - Permittivity

U2 - 10.1109/LAPC.2011.6114124

DO - 10.1109/LAPC.2011.6114124

SN - 9781457710148

BT - Loughborough Antennas & Propagation Conference

T2 - Loughborough Antennas & Propagation Conference

ER -