Research on an artificial dielectric material for millimeter-wave imaging application

Wang, Jinbang; Mei, Hanxue; Yang, Kui; Zhao, Lu; Liu, Zhiguo; Zhang, Tao

doi:10.1364/ao.56.001947

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…Fresh healthy and/or malignant human tissues are rarely available for the aforementioned investigations. Therefore, artificial materials that can mimic the relative permittivity and conductivity of the required human tissues are needed in medical application [Garrett and Fear, 2014; Li et al, 2017; Wang et al, 2017], such as in studying MR EPT that can noninvasively provide in vivo imaging of the relative permittivity and conductivity of tissues at arbitrary tomographic slices [Haacke, et al, 1991; Voigt et al, 2011]. Artificial materials that can precisely mimic the electromagnetic properties of human tissues are required to verify the tomographic images obtained using MR EPT, usually at 3 T with the resonance frequency of 128 MHz.…”

Section: Introductionmentioning

confidence: 99%

Reliable Method for Fabricating Tissue‐Mimicking Materials With Designated Relative Permittivity and Conductivity at 128 MHz

Deng

Cai

Feng

et al. 2020

Bioelectromagnetics

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Artificial materials that can simultaneously mimic the relative permittivity and conductivity of various human tissues are usually used in medical applications. However, the method of precisely designing these materials with designated values of both relative permittivity and conductivity at 3 T MRI resonance frequency is lacking. In this study, a reliable method is established to determine the compositions of artificial dielectric materials with designated relative permittivity and conductivity at 128 MHz. Sixty dielectric materials were produced using oil, sodium chloride, gelatin, and deionized water as the main raw materials. The dielectric properties of these dielectric materials were measured using the open-ended coaxial line method at 128 MHz. Nonlinear least-squares Marquardt-Levenberg algorithm was used to obtain the formula, establishing the relationship between the compositions of the dielectric materials and their dielectric properties at 128 MHz. The dielectric properties of the blood, gall bladder, muscle, skin, lung, and bone at 128 MHz were selected to verify the reliability of the obtained formula. For the obtained formula, the coefficient of determination and the expanded uncertainties with a coverage factor of k = 2 were 0.991% and 4.9% for relative permittivity and 0.992% and 6.4% for conductivity. For the obtained artificial materials measured using the open-ended coaxial line method, the maximal difference of relative permittivity and conductivity were 1.0 and 0.02 S/m, respectively, with respect to the designated values. In conclusion, the compositions of tissue-mimicking material can be quickly determined after the establishment of the formulas with the expanded uncertainties of less than 10%. Bioelectromagnetics. 2021;42:86-94.

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Section: Introductionmentioning

confidence: 99%

Reliable Method for Fabricating Tissue‐Mimicking Materials With Designated Relative Permittivity and Conductivity at 128 MHz

Deng

Cai

Feng

et al. 2020

Bioelectromagnetics

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“…In an AMMW system, using the focusing element to control the size of the beam is vitally important. Usually, a lens is chosen to control the size of the beam because it's easier to design in the near field and easier to manufacture than a reflector [4][5]. The performance of the focusing lens used in AMMW system directly affects the image quality.…”

Section: Introductionmentioning

confidence: 99%

Quasi-optical lens antenna made of electromagnetic-induction materials

Wang¹,

Mei²,

Liu³

et al. 2018

Proceedings of the 2nd International Forum on Management, Education and Information Technology Application (IFMEITA 2017)

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Abstract.A biconvex lens was designed and fabricated by embedding electromagnetic-induction materials (cage-shaped granules of conductor materials, CGC) in polymethyl methacrylate (PMMA). The CGC material has a refractive index of 1.504 at 35 GHz. The spatial resolution and depth of focus of the active millimeter wave (AMMW) imaging system were analyzed. Millimeter-wave (MMW) images of a square and two bars have been obtained with the biconvex lens. The image quality was acceptable, proving that the CGC material has the ability to refract MMWs in MMW imaging.

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