Figure 1.

Experimental setup for measuring phosphorus-31 magnetic resonance spectroscopy (31P MRS) at 3 T, within the spinal erectors. A custom platform was built (striped arrow) to fit on the scanner table. This platform allowed the participants to lie flat on their backs with the phosphorus transmit/receive coil lowered into the platform (white arrow). Underneath the coil, a cavity housed the external cylindrical reference. Spaces were also made for the tuning and matching control rods (black arrow).