NDLI: Two-dimensional FDTD inverse-scattering scheme for determination of near-surface material properties

Content Provider	IEEE Xplore Digital Library
Author	Popovic, M. Taflove, A.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, Que., Canada (Popovic, M.)
Abstract	Numerical inverse-scattering studies found in the literature are based on either frequency- or time-domain approaches. Frequency-domain algorithms can result in a very large number of unknown parameters. In contrast. time-domain approaches can exploit causality to limit the region of inversion, potentially reducing the number of unknowns. The most relevant approach to our work is the one-dimensional (1D) FDTD formulation of an inverse-scattering scheme for remote sensing of inhomogeneous lossy layered media (Umashankar, K.R. et al., 1994). A layer-stripping procedure was used to recover the conductivity and permittivity profiles simultaneously, assuming a normally incident plane wave pulse and zero noise present on the received pulse. Our work extends that technique to the case of a two-dimensional (2D) layered lossy half-space impulsively excited at its surface by an infinitely long monopole. The new algorithm permits simultaneous estimation of the electrical permittivity, /spl epsiv//sub r/, and conductivity, /spl sigma/, of a surface layer by generating a search trajectory in the (/spl epsiv//sub r/, /spl sigma/) parameter space of the layer. The robustness of the algorithm is tested in the presence of Gaussian noise. We illustrate our new algorithm by the measurement of the dielectric parameters and skin thickness of the female human breast. Monitoring of near-surface breast properties may be useful for the prediagnosis of underlying tissue pathologies.
Sponsorship	Northrop Grumman, Electron. Syst. Ohio State Univ. Mission Res. Corp. Nat. Sci. Found
Starting Page	523
Ending Page	526
File Size	146597
Page Count	4
File Format	PDF
ISBN	0780378466
DOI	10.1109/APS.2003.1217511
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Finite difference methods Time domain analysis Material properties Conductivity Permittivity Breast Frequency Remote sensing Nonhomogeneous media Noise robustness
Content Type	Text
Resource Type	Article

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