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(a) Measured FWHM spatial resolution of an undiluted Resovist point source (2 μl) in the imager drops with increasing drive field amplitude. The resolution measured in the imager is comparable to measured resolution in the relaxometer at a similar frequency (23.2 kHz for the MPI scanner vs 25 kHz for the relaxometer). (b) A typical image of a point source. (c) 1D profile through the center of the image. (d) Experimental point source. Scan time: 2 min 52 s, FOV: 2 × 2 × 4.8 cm.
