Enhancement of Magnetic Resonance Imaging with Metasurfaces

Slobozhanyuk, Alexey P.; Poddubny, Alexander N.; Raaijmakers, Alexander J. E.; Berg, Cornelis A.T. van den; Kozachenko, A. V.; Дубровина, И. А.; Melchakova, Irina V.; Kivshar, Yuri S.; Belov, Pavel A.

doi:10.1002/adma.201504270

Cited by 179 publications

(126 citation statements)

References 48 publications

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“…The ability of metamaterials to manipulate the magnetic field has enabled their applications to inductive wireless power transfer, [18] enhancement of the magneto-optic effect, [19] high-quality sensing, [20,21] plasmonic perfect absorption, [22] and magnetic field confinement, [23,24] among others. [27] Recently, judiciously designed metamaterials, consisting of wire [28] or helical resonator arrays, [29] have been utilized to enhance the signal-to-noise ratio (SNR) of the MRI by amplifying the radio-frequency (RF) magnetic field strength due to their capacity for magnetic field enhancement. For example, negative permeability metamaterials have been employed as waveguides [25] and lenses [26] to image deep tissues using 1.5 Tesla (T) MRI systems and a cylindrical meta-atom has been developed to mitigate the field inhomogeneity in 7 T MRI systems based on the Kerker effect.…”

mentioning

confidence: 99%

Intelligent Metamaterials Based on Nonlinearity for Magnetic Resonance Imaging

Zhao

Duan

et al. 2019

Advanced Materials

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the optical regime. [10,11] The capacity of metamaterials for electric field confinement has enabled the realization of a range of physical phenomena in metamaterials, such as electron emission [12] and phase transition in quantum materials. [13] In turn, the electric field enhancement resulting from the near-field confinement leads to nonlinear responses in metamaterials that have been harnessed to enable high harmonic generation, [14] saturable absorption, [15] phase-conjugation, [16] and optical electrifying effects, [17] among other features.In addition to confining the electric field, metamaterials are capable of interacting with and efficiently tailoring the magnetic field. The ability of metamaterials to manipulate the magnetic field has enabled their applications to inductive wireless power transfer, [18] enhancement of the magneto-optic effect, [19] high-quality sensing, [20,21] plasmonic perfect absorption, [22] and magnetic field confinement, [23,24] among others. Another important application of the capacity for magnetic field manipulation is magnetic resonance imaging (MRI), which is the focus herein. For example, negative permeability metamaterials have been employed as waveguides [25] and lenses [26] to image deep tissues using 1.5 Tesla (T) MRI systems and a cylindrical meta-atom has been developed to mitigate the field inhomogeneity in 7 T MRI systems based on the Kerker effect. [27] Recently, judiciously designed metamaterials, consisting of wire [28] or helical resonator arrays, [29] have been utilized to enhance the signal-to-noise ratio (SNR) of the MRI by amplifying the radio-frequency (RF) magnetic field strength due to their capacity for magnetic field enhancement. However, an ongoing limitation of currently available linear metamaterials (LMMs) for enhancing SNR in MRI systems reported to date is their linear nature, resulting in an amplification of the magnetic field during both RF transmission and reception phases in MRI, as shown in Figure 1a. The adoption of an LMM in MRI therefore requires modification of the RF excitation pulses during the transmission phase, [28,29] resulting in undue complications, suboptimal performance, potential safety concerns, and a substantial impediment to clinical adoption.Nonlinear metamaterials (NLMMs) yield an opportunity to construct intelligent and self-adaptive metamaterials in order to selectively enhance the magnetic field during MRI. By leveraging the voltage-dependent capacitance of a varactor diode induced by a reverse-biased p-n junction, [30,31] we developed an NLMM operating at RF frequencies. As opposed

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confidence: 99%

Intelligent Metamaterials Based on Nonlinearity for Magnetic Resonance Imaging

Zhao

Duan

et al. 2019

Advanced Materials

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“…The application of metamaterials in MRI environments is a topic that has been more and more investigated in the last years 21–23 and particular applications have been recently proposed to be applied to this topic 24 . Furthermore, a great interest for electromagnetic field cloaking applications has been demonstrated for a wide range of frequencies.…”

Section: Discussionmentioning

confidence: 99%

An ideal dielectric coat to avoid prosthesis RF-artefacts in Magnetic Resonance Imaging

Zanovello

Matekovits

Zilberti

2017

Sci Rep

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The number of people submitted to total hip or knee arthroplasty increased in the last years and it is likely to grow further. Hence, the importance of a proper investigation tool that allows to determine and recognize the potential presence of perioperative and/or postoperative diseases becomes clear. Although the Magnetic Resonance Imaging (MRI) technique demonstrated several advantages over the other common tomography tools, it suffers from the arise of image artefacts if it is performed in presence of metallic prostheses. In particular, the so-called RF-artefacts are caused by the inhomogeneity in the radiofrequency magnetic field of MRI, due to the electric currents induced on the metal surface by the field itself. In this work, a near-zero permittivity dielectric coat is simulated to reduce those currents and, therefore, the RF-artefacts onset in the final image. Numerical results confirm that the dielectric coat strongly reduces the magnetic field inhomogeneity, suggesting a possible solution to a well-known problem in the MRI field.

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“…Most involve external resonant relays, for example based on 'Swiss roll' resonators [18], magnetoinductive lenses [19,20] or metasurfaces [21,22]. Considerable efforts have also been made to develop endoscopes based on parallel wire media; however, demonstrated systems are still extremely bulky [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

Syms¹,

Kardoulaki²,

Rea³

et al. 2017

PIER

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Abstract-A magnetic resonance imaging (MRI) duodenoscope is demonstrated, by combining nonmagnetic endoscope components with a thin-film receiver based on a magneto-inductive waveguide. The waveguide elements consist of figure-of-eight shaped inductors formed on either side of a flexible substrate and parallel plate capacitors that use the substrate as a dielectric. Operation is simulated using equivalent circuit models and by computation of two-and three-dimensional sensitivity patterns. Circuits are fabricated for operation at 127.7 MHz by double-sided patterning of copper-clad Kapton and assembled onto non-magnetic flexible endoscope insertion tubes. Operation is verified by bench testing and by 1 H MRI at 3T using phantoms. The receiver can form a segmented coaxial image along the length of the endoscope, even when bent, and shows a signal-to-noise-ratio advantage over a surface array coil up to three times the tube diameter at the tip. Initial immersion imaging experiments have been carried out and confirm an encouraging lack of sensitivity to RF heating.

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Enhancement of Magnetic Resonance Imaging with Metasurfaces

Cited by 179 publications

References 48 publications

Intelligent Metamaterials Based on Nonlinearity for Magnetic Resonance Imaging

Intelligent Metamaterials Based on Nonlinearity for Magnetic Resonance Imaging

An ideal dielectric coat to avoid prosthesis RF-artefacts in Magnetic Resonance Imaging

Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

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