Different configurations of metamaterials coupled with an RF coil for MRI Applications

In this paper the effect of coupling two kinds of metamaterial cells with a coil to achieve Magnetic Resonance Imaging (MRI) is investigated. Both an array of four spirals and a single spiral-shaped metamaterial are associated to the coil antenna. The goal is to increase the sensitivity of the whole system and to improve the homogeneity of the RF magnetic field pattern. The spiralshaped metamaterials associated to the antenna give very promising numerical results. We are fabricating both structures using microfabrication techniques because of the small size of the structures.