Meeting Banner
Abstract #2693

Traveling Wave MRI in a Vertical Bore 21.1-T System

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).

Abstract PDF Poster PDF

Keywords

achieved acrylic allowed analytical apparent arrangement asymmetry available axial axis beyond biomedical bore bottom capability capable centrifuge chemical clear clinical coil computational concentric conditions constructed construction continuing copper corroborate coupled critical cylindrical dataset developed diameter dielectric dielectrics ease either employed enable entirely excitation expected experiment experimental field fields free frequency general gradients grant head hybrid immersed impedance implementation in vivo inclusion initial inside interfaces isotropic laboratory length limited loop lowest magnet materials mode modes mouse much national nature novel null numerical obstruction open operating orientation orthogonal parallel part partially particularly pattern persists phantom physics pickup potentially power practice presence preserved price problem propagate propagating propagation properties proton recalled regime relies represent requirements resolution saline sample samples scanner schematic screened selection shield simple simulate simulated simulations space spatially special specially strength supports system systems transmission traveling tube typical ultra uniquely user usually utilization varied vertical volume water wave waveguide wavelength wavelengths waves wide yield