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A single coil element based on a composite right/left-handed (CRLH) metamaterial transmission line for combined sodium and hydrogen MRI is presented.  It provides the particular feature of equal quarter-wavelength current and electromagnetic (EM) field distributions at the two distinct Larmor frequencies of  23 Na- and  1 H-nuclei at 7 T magnetic flux density.  The functionality of a manufactured prototype is validated through near-field measurements that are compared with finite-difference time-domain (FDTD) simulations.  Finally, results of a first successful MRI experiment are presented for a canister phantom including ping-pong ball insets filled with different liquids of high sodium concentrations.

A metamaterial based dual-resonant coil element for combined sodium/hydrogen MRI at 7 Tesla

A metamaterial based dual-resonant coil element for combined sodium/hydrogen MRI at 7 Tesla