Title :
Alternating impedance multi-channel transmission line resonators for high field magnetic resonance imaging
Author :
Akgun, Can Eyup ; DelaBarre, Lance ; Snyder, Carl Jason ; Sohn, Sung-Min ; Adriany, Gregor ; Ugurbil, Kamil ; Gopinath, Anand ; Vaughan, John Thomas
Author_Institution :
Center for Magn. Resonance Res., Univ. of Minnesota, Minneapolis, MN, USA
Abstract :
In high field MRI systems, microstrip transmission line elements have been successfully implemented as magnetic field generating elements in multi-channel volume coils. However, at these field strengths, short in vivo wavelengths and greater sample losses lead to RF in-homogeneities, as well as, RF inefficiencies. Optimizations of these elements are required to overcome these challenges and to perform a variety of MR applications. In this study, two different microstrip designs with varying impedance lines along the length of the coil - one producing peak magnetic field in the center and the other extending the length of usable magnetic field along the length of the coil - are investigated. Simulation and image results for 8- channel volume coils incorporating these element designs were obtained using a phantom in a 7 Tesla MRI system.
Keywords :
coils; electromagnets; magnetic fields; magnetic resonance imaging; microstrip resonators; alternating impedance multichannel transmission line resonator; high field MRI system; high field magnetic resonance imaging; magnetic field generating elements; magnetic flux density 7 T; microstrip transmission line elements; varying impedance lines; Capacitors; Coils; Imaging phantoms; Impedance; Magnetic fields; Magnetic resonance imaging; Microstrip resonators; RLC circuits; Radio frequency; Transmission lines; MRI; Microstrip; RF coils; impedance; resonators;
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2010.5517107
