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      Diseño de lente metamaterial con anillos resonantes para aplicación en imágenes médicas por Resonancia Magnética Translated title: Metamaterial lens design with resonant rings for application in medical imaging of Magnetic Resonance

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          Abstract

          RESUMEN El presente artículo propone el diseño de dos prototipos de lentes metamateriales magnéticas empleando anillos resonadores. La estructura elegida es basada en resonadores CLR por sus siglas en inglés (capacitively loaded rings). Los diseños se conciben como guías de onda, con la finalidad de disminuir el efecto del campo eléctrico que provoca el aumento de la Relación Señal-Ruido en la bobina para animales (Volume Resonator ID35OD119 of Rapid Biomedical GmbH). Esta bobina se emplea para obtener imágenes de ratas en ensayos no clínicos. Para ello se empleó el equipo de imágenes por resonancia magnética Siemens Magnetón Allegra 3T del Centro de Neurociencias de Cuba a una frecuencia de Larmor de 123.3 MHz.

          Translated abstract

          ABSTRACT This article proposes the design of two prototypes of magnetic metamaterial lens using rings resonator. The chosen structure is based on CLR resonator (capacitively loaded rings). The designs are conceived as wave guides, in order to reduce the effect of the electric field that causes the increase Signal-Noise Ratio in the coil for animals (Volume Resonator IDR5OD119 from Rapid Biomedical GmbH). This coil is used to obtain images of rats in non-clinical trials. The Siemens Magneton Allegra 3T Magnetic Resonance Imaging equipment was used from the Cuban Neuroscience Center at Larmor frequency of 123.3 MHz.

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          Magnetism from conductors and enhanced nonlinear phenomena

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            A New Compact Double-Negative Miniaturized Metamaterial for Wideband Operation

            The aim of this paper is to introduce a compact double-negative (DNG) metamaterial that exhibits a negative refractive index (NRI) bandwidth of more than 3.6 GHz considering the frequency from 2 to 14 GHz. In this framework, two arms of the designed unit cell are split in a way that forms a Modified-Z-shape structure of the FR-4 substrate material. The finite integration technique (FIT)-based Computer Simulation Technology (CST) Microwave Studio is applied for computation, and the experimental setup for measuring the performance is performed inside two waveguide ports. Therefore, the measured data complies well with the simulated data of the unit cell at 0-degree and 90-degree rotation angles. The designed unit cell shows a negative refractive index from 3.482 to 7.096 GHz (bandwidth of 3.61 GHz), 7.876 to 10.047 GHz (bandwidth of 2.171 GHz), and 11.594 to 14 GHz (bandwidth of 2.406 GHz) in the microwave spectra. The design also exhibits almost the same wide negative refractive index bandwidth in the major region of the C-band and X-band if it is rotated 90 degrees. However, the novelty of the proposed structure lies in its effective medium ratio of more than 4, wide bandwidth, and compact size.
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              Development of a magnetoinductive lens for magnetic resonance imaging

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                Author and article information

                Journal
                eac
                Ingeniería Electrónica, Automática y Comunicaciones
                EAC
                Universidad Tecnológica de La Habana José Antonio Echeverría, Cujae (La Habana, , Cuba )
                1815-5928
                December 2021
                : 42
                : 3
                : 1-17
                Affiliations
                [1] La Habana orgnameCentro de Neurociencias de Cuba Cuba
                [2] La Habana orgnameUniversidad Tecnológica de la Habana “José Antonio Echeverría” (CUJAE) Cuba
                Article
                S1815-59282021000300001 S1815-5928(21)04200300001
                22e63cfd-34a6-4c2b-9a12-96101919da30

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 26 November 2021
                : 20 August 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 17, Pages: 17
                Product

                SciELO Cuba

                Categories
                ARTICULOS ORIGINALES

                Magnetic Resonance Imaging,imágenes por resonancia magnética,Relación Señal-Ruido,guías de onda,resonadores CLR,anillos resonadores,lentes metamateriales magnéticas,Signal-Noise Ratio,wave guides,CLR resonator (capacitively loaded rings),rings resonator,magnetic metamaterial lens

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