Title :
Investigation of the resonance behavior of a MR-birdcage applying a 3-D-FEM code
Author :
Renhart, W. ; Biró, O. ; Wach, P. ; Stollberger, R.
Author_Institution :
Inst. for Fundamentals & Theory in Electr. Eng., Tech. Univ. Graz, Austria
fDate :
9/1/2001 12:00:00 AM
Abstract :
For MR-imaging processes, high precision in the homogeneity of the static magnetic field B&oarr;0 and of the high frequency transversal field B&oarr;1 is extremely important. Investigations on the behavior of the field B&oarr;1 in a widely used birdcage resonator type consisting of twelve rods are presented in this paper. On coil systems for B&oarr;0-fields of 1.5 T and of 4.0 T the field requirements at resonance will be discussed. Special attention is paid to the influence of necessary RF-shields. The numerical simulations of the resonators are done using a 3D finite element code, based on an edge element formulation
Keywords :
coils; electromagnetic shielding; finite element analysis; magnetic fields; magnetic resonance imaging; resonators; 1.5 T; 3D finite element method; 4.0 T; RF shield; birdcage resonator; coil system; edge elements; magnetic field; magnetic resonance imaging; numerical simulation; Capacitance; Coils; Copper; Finite element methods; Frequency; Geometry; Image quality; Magnetic fields; Magnetic resonance; Numerical simulation;
Journal_Title :
Magnetics, IEEE Transactions on
