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Peak signal increases with the increasing magnetic field slew rate. (a) Peak signal in the imager increased approximately linearly for Resovist with increasing drive field amplitude. [(b) and (c)] Peak signal in the relaxometer increased linearly with magnetic slew rate, for Resovist and UW33 at four frequencies (4.5, 9.3, 12.2, and 25 kHz) across a range of drive field amplitudes (5–30 mT).
