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Simulation of polarization transfer due to cross relaxation between 15N and 1H in hyperpolarized [15N2]urea, where 15N hyperpolarization at t = 0 is 2.3%. A, Time dependence of the 15N and 1H polarizations. B, 15N and 1H polarizations following a series of 90° 1H pulses applied at 2 s intervals. C, 15N and 1H polarizations following repeated application of the ImpeRfection RobUst Partial Transfer (IRRUPT) pulse sequence at 2 s intervals. NOE, nuclear Overhauser enhancement
