Radiofrequency Coil for Dual-nuclei MR Muscle Energetics Investigation Based on Two Capacitively Coupled Periodic Wire Arrays

International audienceIn this paper, we describe a dedicated radiofre-quency coil for magnetic resonance imaging and spectroscopy (MRSI) at 4.7 T optimized for investigation of muscle ener-getics in a human forearm. The coil operating at the Larmor frequencies of protons 1 H (200.1 MHz) and phosphorous 31 P (81 MHz) is based on two cylindrical periodic structures made of thin metal wires with tips interconnected through structural capacities of printed overlapping patches and sliding electric contacts. By independently exciting two orthogonal eigenmodes of the structure, the coil can be tuned and matched at both frequencies without lumped capacitors and cover the target region of interest for the forearm flexor muscles