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Abstract #2499

Metamaterial Liner RF Head Coil for 23Na and 1H at 4.7 T

Adam Maunder1, Ashwin Iyer2, and Nicola De Zanche1
1Oncology, Medical Physics, Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada, 2Electrical and Computer ENgineering, University of Alberta, Edmonton, AB, Canada

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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