Array Sensitivity for Model-Based Microwave Breast Imaging

Mays, R. Owen; Behdad, Nader; Hagness, Susan C.

doi:10.1109/tap.2017.2688800

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Quantitative methods such as the Born iterative method [1] and the distorted Born iterative method [2] often struggle for high-contrast targets or take many iterations. In addition, the sensitivity of quantitative methods to forward solution error presents challenges when there are mismatches between the true and assumed propagation environments (e.g., [4]). Lastly, the internal dielectric profile of a near-PEC target is generally non-informative, and thus the computational expense associated with performing a quantitative estimate via nonlinear optimization may not be justified.…”

Section: Introductionmentioning

confidence: 99%

Phase-Encoded Linear Sampling Method Imaging of Conducting Surfaces From Full and Limited Synthetic Apertures

Burfeindt

Alqadah

2022

IEEE Open J. Antennas Propag.

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The linear sampling method (LSM) is a qualitative inverse scattering technique that can create good-fidelity imagery at low computational expense. However, it is challenging to use in many practical scenarios due to its need for wide-angle multistatic-multiview data with dense spatial sampling. We present a new LSM formulation for imaging conducting targets from a more limited sensor distribution. The technique mitigates the challenge of limited multistatic diversity by disciplining the solution via a propagation-based phase encoding. Phase encoding is accomplished on receive via a beamforming operation and on transmit via a regularization that enforces a desired phase behavior. We evaluate the method by applying it to multistatic synthetic aperture scenarios where a few sensors travel in formation while collecting data. These scenarios are challenging for conventional LSM, but also potentially desirable due to the limited required hardware resources. We demonstrate with both simulated and experimental data that the proposed technique produces images of fundamentally greater fidelity compared to conventional LSM processing. We demonstrate significantly improved performance both when the aperture completely encircles the target and when the aperture is limited in aspect. The latter result is particularly significant, as limited apertures present significant challenges to LSM imaging.INDEX TERMS Inverse scattering, beamforming, antenna arrays.

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Section: Introductionmentioning

confidence: 99%

Phase-Encoded Linear Sampling Method Imaging of Conducting Surfaces From Full and Limited Synthetic Apertures

Burfeindt

Alqadah

2022

IEEE Open J. Antennas Propag.

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“…Since all parts in a living biosystem are dielectric in nature [6], they can be considered as lossy dielectric and electromagnetic waves can penetrate inside the biosystem. For that reason, several electromagnetic imaging systems were developed [2,3,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] to meet the high demand for an alternative imaging modality for clinical applications.…”

Section: Introductionmentioning

confidence: 99%

Millimetre‐wave multi‐view near‐field scattering tomography system

Shahir

Semnani

Mohajer

et al. 2018

IET Microwaves, Antennas & Propagation

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In a previous study by Shahir et al., the permittivity profile of object under test (OUT) from electric fields measured outside OUT is accurately estimated by considering the region of interest confined within the boundary of the OUT. This study proposes a continuous‐wave multi‐view near‐field scattering tomography system at the millimetre‐wave frequency range and reformulates the sub‐space approach for reconstructing the continuous‐wave tomographic images while considering the region of interest beyond the OUT boundary. The OUT reconstructed tomographic images enable one to localise the OUT boundaries. The proposed system also eliminates the need for fully systemic isolation (i.e. anechoic chamber) or water as a background medium by reducing multipath effects substantially at millimetre wave. The system performance is evaluated by reconstructing the tomographic images of various samples, and the experimental results are presented.

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