TY  - JOUR
AU  - Koh, D.
AU  - Felder, J.
AU  - Shah, N. J.
TI  - A novel analytical description of periodic volume coil geometries in MRI
JO  - Journal of magnetic resonance
VL  - 288
SN  - 1090-7807
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2018-01663
SP  - 37 - 42
PY  - 2018
AB  - MRI volume coils can be represented by equivalent lumped element circuits and for a variety of these circuit configurations analytical design equations have been presented. The unification of several volume coil topologies results in a two-dimensional gridded equivalent lumped element circuit which compromises the birdcage resonator, its multiple endring derivative but also novel structures like the capacitive coupled ring resonator.The theory section analyzes a general two-dimensional circuit by noting that its current distribution can be decomposed into a longitudinal and an azimuthal dependency. This can be exploited to compare the current distribution with a transfer function of filter circuits along one direction. The resonances of the transfer function coincide with the resonance of the volume resonator and the simple analytical solution can be used as a design equation. The proposed framework is verified experimentally against a novel capacitive coupled ring structure which was derived from the general circuit formulation and is proven to exhibit a dominant homogeneous mode.In conclusion, a unified analytical framework is presented that allows determining the resonance frequency of any volume resonator that can be represented by a two dimensional meshed equivalent circuit.
LB  - PUB:(DE-HGF)16
C6  - pmid:29414062
UR  - <Go to ISI:>//WOS:000427807000005
DO  - DOI:10.1016/j.jmr.2018.01.003
UR  - https://juser.fz-juelich.de/record/844222
ER  -