Well-established and emerging methods of 23Na sodium imaging in the brain benefit from high field strength, but require imaging sequences that are constrained by specific absorption rate (SAR) limits. Additionally, concurrent proton imaging is desirable for complementary anatomical/structural information. Here, we present a novel metamaterial liner-based MR coil for 23Na/1H imaging at 4.7 T, consisting of longitudinally-spaced rings that alter the effective electromagnetic properties between the liner and outer RF shield (waveguide boundary). In simulation, the metamaterial liner was found to produce lower local 10g averaged SAR for the same mean transmit field relative to a conventional birdcage coil.
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