Abstract #1358
Accurate and fast longitudinal RF magnetic field profiling for 7T traveling-wave MRI systems
Thorsten Liebig 1 , Jan Taro Svejda 1 , Hongyi Yang 1 , Andreas Rennings 1 , Juerg Froehlich 2 , and Daniel Erni 1
1
General and Theoretical Electrical
Engineering (ATE), University of Duisburg-Essen,
Duisburg, NRW, Germany,
2
Laboratory
for Electromagnetic Fields and Microwave Electronics (IFH),
ETH Zurich, Zurich, ZH, Switzerland
We propose an adaptive, fast and accurate scheme for
tailoring the RF magnetic field along the bore of a 7T
traveling-wave MRI system. The setting consists of a
periodic arrangement of quadrature fed resonant CRLH
metamaterial ring antennas that are perfectly apt to
excite, mold, and dump the propagating TE11 mode within
the cylindrical bore. We have achieved narrow field
profiles for larynx illumination while tackling the
inverse problem using efficient electromagnetic
simulations in conjunction with a direct (weighted)
least-squares solution. This localized traveling-wave
approach has the potential to act as a non-resonant head
coils supporting uniform high-resolution brain imaging.
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