Abstract
In this paper, we present a numerical investigation of metal-dielectric metasurface to improve the image quality of a 3-Tesla Magnetic Resonance Imaging system. The designed metasurface consists of non-magnetic copper strips placed in a circular fashion on a high dielectric substrate. The eigenmode analysis of the designed metasurface shows the fundamental eigenmode at a resonant wavelength of 127 Megahertz, which corresponds to the operating frequency of 3-Tesla Magnetic Resonance Imaging. When metasurface is investigated under the presence of an electromagnetic field, it is observed that the magnetic field redistributes at the centre of the metasurface and paves the way for better image quality. The three voxel simulation scenarios—the first with a metasurface, the second with just a dielectric pad, and the third with “no surface”—were compared in the numerical simulation. It is found that the proposed metasurface significantly reduces the Specific Absorption Rate value and increases the magnetic field in the area of interest by 1.5 times compared to the dielectric pad and by more than double compared to the “no surface” scenario.
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