Comparison of the RF Fields Distribution Between a High-Permittivity Material and a Metasurface for Magnetic Resonance Imaging

Different novel solutions have been explored to improve the fields distribution for Magnetic Resonance Imaging. High Permittivity Materials and metasurfaces have shown very promising results for enhancing the Signal to Noise Ratio and the Transmit Efficiency. In this work, through numerical simulations, we analyze the electromagnetic field distribution in a cubic phantom when two dipoles are used to generate the radiofrequency fields for three cases: when no additional devices are used to manipulate the fields, and when a metasurface and a High-Permittivity Material are positioned between the coil and the phantom. The results show that the metasurface and High-Permittivity Material significantly contribute to enhance the fields in the phantom. Specifically, the metasurface improve the fields in locations closer to the coil, while the High-Permittivity Material perform better in locations far from the coil.