Optimization of a Transverse Electromagnetic Resonator for Magnetic Resonance Imaging at High Field of 9.4 T

In this paper, we have implemented a numerical tool using finite element method (FEM) for designing an antenna for MRI (Magnetic Resonance Imaging) probe operating at high field. The birdcage antenna type is a transverse electromagnetic (TEM) coupled lines resonator, and the developed model in the absence of a biological load is based on the propagation equations of voltages and currents on the coupled lines of the resonator. This numerical tool simulates the frequency response of the reflection coefficient of the RF (Radio Frequency) excitation port of the resonator, which allows us to estimate the level of adaptation of the antenna for imaging small animals at a field of 9.4 T.