Alexey A. Tonyushkin1, 2, Jose Antonio Muniz3, 4, Samuel Colles Grant3, 4, Andrew J M Kiruluta1, 2
1Radiology, Massachusetts General Hospital, Boston, MA, United States; 2Physics, Harvard University, Cambridge, MA, United States; 3Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL, United States; 4Chemical & Biomedical Engineering, The Florida State University, Tallahassee, FL, United States
Originally implemented clinically at 7 T, traveling wave nuclear magnetic resonance is a far-field imaging technique that relies on successful mode propagation in a waveguide. However, for higher field magnets with smaller bores, hollow waveguides are below cut-off requirements for mode propagation. This work demonstrates the first traveling wave MRI experiments on a 21.1-T (900-MHz) vertical widebore magnet. Coupled with a simple transceive loop coil, the setup utilizes a high dielectric material within a cylindrical waveguide to achieve a traveling wave regime that allows the propagation of numerous modes (TEmn, TMmn and HEmn).