Figure 1From: Clinical Implications of Cardiac Hyperpolarized Magnetic Resonance ImagingThe DNP process. (A) Tracer Sample (13C pyruvate in this example) is placed in a strong magnetic field with a radical source of electrons (B). The sample is cooled to very low temperatures (C) resulting in high electron polarization. Microwaves are used to transfer the spin polarization from electrons to the tracer (D). The tracer is rapidly melted for injection (E).Back to article page