Hyperpolarized 13C MRI using nanodiamond (ND) holds the potential for tailored diagnostic imaging combined with targeted drug delivery in the human body. An obstacle to realizing this potential is the transfer of hyperpolarized ND from the hyperpolarizer to the patient without losing the majority of the 13C polarization as it travels through low magnetic fields before reaching the MRI scanner. We demonstrate that polarization loss is highly dependent on magnetic field and construct a system of transfer magnets that improves the transfer efficiency of our hyperpolarized ND by more than an order of magnitude.
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