In this paper, a passive and conformal magnetic metasurface excited by a 3T-MRI birdcage coil and able to enhance the magnetic field distribution inside the biological load is presented. The proposed structure is composed by a 5 × 13 passive array, whose unit-cells are loaded with capacitors chosen to precisely control the induced currents. These reactive loads are calculated with an analytic algorithm that optimizes the magnetic field distribution. We performed full-wave simulations of a biologically loaded birdcage coil working at 128 MHz with and without the metasurface presence. Specifically, the two cases were compared in terms of B1+ distribution inside the phantom. A significant magnetic field enhancement in the phantom region closer to the metasurface was observed, proportionally improving the signal-to-noise ratio. Our preliminary results suggest the possibility to adopt conformal metasurfaces for improving transmit performance in 3T magnetic resonance imaging, which will be further explored in future work.
A Passive and Conformal Magnetic Metasurface for 3T MRI Birdcage Coil / Rotundo, S.; Brizi, D.; Carluccio, G.; Lakshmanan, K.; Collins, C. M.; Lattanzi, R.; Monorchio, A.. - (2023), pp. 222-224. (Intervento presentato al convegno 2023 International Conference on Electromagnetics in Advanced Applications (ICEAA)) [10.1109/ICEAA57318.2023.10297782].
A Passive and Conformal Magnetic Metasurface for 3T MRI Birdcage Coil
Carluccio G.;
2023
Abstract
In this paper, a passive and conformal magnetic metasurface excited by a 3T-MRI birdcage coil and able to enhance the magnetic field distribution inside the biological load is presented. The proposed structure is composed by a 5 × 13 passive array, whose unit-cells are loaded with capacitors chosen to precisely control the induced currents. These reactive loads are calculated with an analytic algorithm that optimizes the magnetic field distribution. We performed full-wave simulations of a biologically loaded birdcage coil working at 128 MHz with and without the metasurface presence. Specifically, the two cases were compared in terms of B1+ distribution inside the phantom. A significant magnetic field enhancement in the phantom region closer to the metasurface was observed, proportionally improving the signal-to-noise ratio. Our preliminary results suggest the possibility to adopt conformal metasurfaces for improving transmit performance in 3T magnetic resonance imaging, which will be further explored in future work.File | Dimensione | Formato | |
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