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The technique relies on the incorporation of hyperpolarized H2 into molecules, usually by hydrogenation.
References
Richard A.Green; Ralph W.Adams; Simon B.Duckett; Ryan E.Mewis; David C.Williamson; Gary G.R.Green (2012). "The theory and practice of hyperpolarization in magnetic resonance using parahydrogen". Progress in Nuclear Magnetic Resonance Spectroscopy. 67: 1–48. doi:10.1016/j.pnmrs.2012.03.001. PMID23101588.