Improving B 1 + Uniformity Using Segmented Dielectric Pads
Aurelien Destruel 1 , Jin Jin 1 , Feng Liu 1 , Mingyan Li 1 , Ewald Weber 1 , and Stuart Crozier 1
School of ITEE, University of Queensland,
Brisbane, Queensland, Australia
This study presents a novel method of improving
dielectric shimming. In contrast to conventional
approach where large pads are generally used, narrow
segmented pads are used in the current study.
Additionally, the combination of permittivity values for
all segments is optimised. The simulation results show
that, for 7T head imaging, using eight narrow pads with
optimised permittivity distribution constraints the
displacement currents to the longitudinal direction, to
most effectively produce transmit magnetic field.
Furthermore, the uniformity of the transmit magnetic
field has been significantly improved. By increasing the
degrees-of-freedom in regulating the displacement
current distribution, the proposed approach provides a
new perspective in dielectric shimming.
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