31P Spectroscopy in Human Calf Muscle at 7 Tesla Using a Balanced Double-Quadrature Proton-Phosphorus RF Coil

Andrew Webb¹, Nadine Smith¹

In order to obtain high quality 31P data from human calf muscle, we have designed a closely-fitting double-tuned half-volume coil with quadrature on both 1H and 31P channels. Balanced, second order trap circuits are inserted into the heteronuclear coil to prevent counter-currents from being set up at the proton frequency, thus improving the efficiency of the proton channel. 2D 31P CSI data sets have been obtained at 7 tesla using this coil, with high signal-to-noise.