Title :
RF excitation in 7 tesla MRI systems using monofilar axial-mode helical antenna
Author :
M. M. Ilić;A. A. Tonyushkin;N. Šekeljić;P. Athalye;B. M. Notaroš
Author_Institution :
School of Electrical Engineering, University of Belgrade, Serbia
fDate :
7/1/2015 12:00:00 AM
Abstract :
We present a novel RF exciter for traveling-wave magnetic resonance imaging (MRI) systems based on a monofilar axial-mode helical antenna. In specific, we present a bore-extended, subject-loaded monofilar helical antenna for 7-T (ultra-high magnetic field) MRI systems. By means of rigorous full-wave electromagnetic modeling, we confirm clear advantages of the novel exciter over the existing TW excitation methods, and its excellent performance in terms of circular polarization and uniformity of the RF magnetic field in simple phantoms inside MRI bores at 7 T.
Keywords :
"Magnetic resonance imaging","Radio frequency","Magnetic fields","Phantoms","Helical antennas","Finite element analysis"
Conference_Titel :
Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2015 IEEE International Symposium on
DOI :
10.1109/APS.2015.7305062
