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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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