Keywords: Non-Array RF Coils, Antennas & Waveguides, Non-Array RF Coils, Antennas & Waveguides
Motivation: Although dielectric waveguides can facilitate efficient travelling-wave MRI, their effectiveness is constrained by the availability of high-permittivity materials.
Goal(s): Design dielectric waveguide with artificial dielectric slabs for efficient travelling-wave MRI at 7T.
Approach: Artificial dielectric slabs with high in-plane permittivity were employed, consisting of periodic metal patches on alternating and shifted layers.
Results: Compared to previously reported dielectric waveguides, the artificial dielectric waveguide demonstrates comparable efficacy in TE11-TM11 mode-conversion, power-focusing, and phase-velocity matching. These findings have been validated through numerical simulations and MRI studies conducted on a saline head phantom.
Impact: The promising results offer valuable insights into the design of future UHF MRI travelling-wave transmission systems.
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