Most applications of hyperpolarized compounds for in vivo metabolic imaging currently use the Dynamic Nuclear Polarization (DNP) technique, for which commercial apparatus exists . However, the DNP technique suffers from high capital and running costs, low throughput, large footprint and technical complexity. This has stimulated interest in compact, mobile and less expensive methods such as parahydrogeninduced polarization (PHIP) . Although less general than DNP, PHIP-based techniques do not require high magnetic fields or cryogenic equipment, and also have high potential throughput.