Contribution of the Inherent Traveling Wave in 7T to Large FOV Imaging

Bei Zhang¹, Daniel K. Sodickson¹, Qi Duan¹, Graham Wiggins¹

As the traveling wave has become a hot topic in high field MR as a promising method for large FOV imaging since ISMRM 2008, a lot of applications of traveling wave in imaging have been discussed. Since the conductive interface in 7T allows the propagation of TE11 mode, all excitations can create a TE11 mode in the interface. Therefore, it needs to understand the traveling wave contribution even in the conventional transmission and reception methods. In this work, we do full-wave electrodynamic simulations with a body model to explore the contribution of the conductive surface to the large FOV imaging with a conventional excitation method. From the simulation results, it can be seen that the traveling wave created in the conductive interface extends the FOV and boosts the SNR. It is also found that: in order to effectively excite the working mode, the position of the excitation should be that the current distribution in the excitation and the H field pattern comply with the right-hand law.