A TSVD Analysis of the Impact of Polarization on Microwave Breast Imaging Using an Enclosed Array of Miniaturized Patch Antennas

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

doi:10.1109/lawp.2014.2365755

Cited by 22 publications

(7 citation statements)

References 14 publications

(22 reference statements)

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“…The problem with the aforementioned cross-correlation based fidelity metric is exposed in its inability to answer the question: how the introduced features impact inversion performance and final image quality. A more advanced method is Truncated Singular Value Decomposition (TSVD) [38], [46]. TSVD method separates the testing of measured data quality from the problem of the inversion algorithm design.…”

Section: Resultsmentioning

confidence: 99%

“…Such an antenna would occupy less volume compared to the aforementioned Vivaldi and waveguide antennas [15]. A similar methodology of rectangular geometry is used for designing an array based on the multiband patch antenna [8], [14], [37], [38]. This array successfully fulfills all the aforementioned criteria, In [37], some additional criteria are given, for example possibility of coregistration with Magnetic Resonance Imaging (MRI).…”

Section: A Antenna Design Methodologymentioning

confidence: 99%

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Design and Modelling of an Enclosed Array of Square Spiral Antennas for Microwave Tomography

Subotic¹,

Pjevalica²,

Palfi³

2017

ElAEE

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Microwave tomography is a microwave imaging method in which the resolution is not limited by wavelength, but rather by measurement noise and modelling errors. Inversion algorithm is used for obtaining an image from the measured scattered waves. Performance improvement of the inversion algorithm is introduced by approximately modelled antennas as a point, line or plane source. Such modelling of antennas introduces modelling errors. Antenna array in the unshielded measurement chamber will pick up external interference, as well as backscattering of array's own radiation. Multipath occurring in measurement chamber has a large impact on the measurement performance. The wave propagated through the air and reflected from the chamber walls could mask a weaker wave scattered by the object under imaging. Also, a larger number of the antennas improves inversion and gives a more accurate image. This paper proposes a novel design of enclosed measurement antenna array for microwave tomography. To obtain an accurate and efficient antenna model in 3D FDTD, a square spiral wire antenna is used in this design. A metal shield protects the process of measurement from external interference and backscattering. Between the antenna array and the metal shield an absorption wall is introduced, which decreases multipath and partially prevents signal masking. Square spiral wire antennas are overlapped and packed, giving a larger number of antennas in the same space. Enclosed antenna array is modelled in 3D FDTD. Proposed antenna array is compared with solutions found in literature. Comparison is done using metrics relevant for antenna array measurement in microwave tomography.

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Section: Resultsmentioning

confidence: 99%

Section: A Antenna Design Methodologymentioning

confidence: 99%

Design and Modelling of an Enclosed Array of Square Spiral Antennas for Microwave Tomography

Subotic¹,

Pjevalica²,

Palfi³

2017

ElAEE

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“…To improve the matrix condition number, Tikhonov regularization technique was used. Other regularization techniques may also be applied including the Truncated Singular Value Decomposition method . Following Tikhonov's regularization, (7) becomes,

\begin{matrix} true{ε_{k + 1} true} = true{ε_{k} true} - {true[J^{T} J + μ R true]}^{- 1} {true[J true]}^{T} true({S}_{normalmeas} - \\ F true(true{ε_{0} true} true) - true[J true] (true{ε_{k} true} - true{ε_{0} true} true) \end{matrix}

…”

Section: The Image Reconstruction Algorithmmentioning

confidence: 99%

A modified Gauss-Newton algorithm for fast microwave imaging using near-field probes

Islam

Kiourti

Volakis

2017

Microw. Opt. Technol. Lett.

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In this work, effort has been made to reduce the reconstruction time of microwave tomographic images using the conventional Gauss‐Newton (GN) algorithm. As the forward scattering solution takes the most percentage of the total time, a modification to the GN algorithm by employing a Taylor series approximation of the forward problem is proposed. This helps to avoid the time consuming forward scattering solution required in each iteration, as such, the image reconstruction time is only limited by the time of the algebraic calculations involving matrices and vectors. Moreover, unlike most other works, in this paper, the imaging domain along with the actual transceivers are modeled by a full‐wave finite element method based commercial software package which reduces the so called “model error.” For validation of this method, a set of transceivers consisting of 8 dipole antennas operating at 1.2 GHz was fabricated on a flexible substrate and placed conformally around a cylindrical imaging domain. Simulation and measurements showed good agreement and fast image reconstruction. Overall, the proposed modified GN algorithm offers a fast imaging method towards developing high‐speed conformal microwave imagers for continuous monitoring. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1394–1400, 2017

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“…The impact of polarization on image reconstruction was evaluated in Ref. [13], and it was concluded that the effectiveness was limited. However, the physical considerations related to antenna arrangement have not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

Microwave Imaging for Early Breast Cancer Detection

Kuwahara¹

2017

New Perspectives in Breast Imaging

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We overview the research trend on microwave imaging for early breast cancer detection. The technologies have two categories: ultra-wide band (UWB) radar that reconstructs the scattering power distribution in the breast and inverse scattering problem that reconstructs the dielectric properties distribution. We have developed a clinical equipment using UWB radar and carried out clinical test 4 years ago. Through the experiments, we concluded that the UWB radar was insufficient for the clinical equipment, because the UWB radar cannot discriminate cancerous tumor and other lesions. Therefore, we have been studying inverse scattering. It is a challenging task to develop an equipment using inverse scattering technologies. We have proposed a microwave mammography that has four features: (1) sensor with breast fixing by absorption, (2) small sensor with multipolarization, (3) image reconstruction program linking the commercial EM simulator, and (4) hybrid imaging method using UWB radar and inverse scattering.

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A TSVD Analysis of the Impact of Polarization on Microwave Breast Imaging Using an Enclosed Array of Miniaturized Patch Antennas

Cited by 22 publications

References 14 publications

Design and Modelling of an Enclosed Array of Square Spiral Antennas for Microwave Tomography

Design and Modelling of an Enclosed Array of Square Spiral Antennas for Microwave Tomography

A modified Gauss-Newton algorithm for fast microwave imaging using near-field probes

Microwave Imaging for Early Breast Cancer Detection

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