Parameter Scaling in Non-Linear Microwave Tomography
Paper in proceedings, 2012

Non-linear microwave tomographic imaging of the breast is a challenging computational problem. The breast is heterogeneous and contains several high-contrast and lossy regions, resulting in large differences in the measured signal levels. This implies that special care must be taken when the imaging problem is formulated. Under such conditions, microwave imaging systems will most often be considerably more sensitive to changes in the electromagnetic properties in certain regions of the breast. The result is that the parameters might not be reconstructed correctly in the less sensitive regions. In this paper, a method for obtaining a more uniform sensitivity throughout the breast is investigated. The method for obtaining uniform sensitivity throughout the imaging domain is a scaling of the parameters to be reconstructed. This scaling, based on the norms of the columns of the Jacobian, is also introduced as a measure of the sensitivity. The scaling of the parameters is shown to improve performance of the microwave imaging system when applied to reconstruction of images from 2-D simulated data and measurement data.

microwave imaging

preconditioning

sensitivity

Author

P. D. Jensen

Technical University of Denmark (DTU)

Tonny Rubaek

Technical University of Denmark (DTU)

Oskar Talcoth

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Biomedical Electromagnetics

J. J. Mohr

Technical University of Denmark (DTU)

Neil R. Epstein

Thayer School of Engineering at Dartmouth

2012 Loughborough Antennas & Propagation Conference, Loughborough, United Kingdom, 12-13 November 2012

6403009

Areas of Advance

Life Science Engineering (2010-2018)

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/LAPC.2012.6403009

ISBN

978-1-4673-2220-1

More information

Latest update

2/28/2018