A non-selective inversion pulse is applied to a plurality of slices, r.f. resonance in MR active nuclei is excited in each of those slices individually, and the slice excitation order is cycled so that the time for the non-selective inversion pulse to any particular phase-encode gradient of all the slices is the same, the time of the zero phase-encode gradient corresponding to that for zero signal from cerebro spinal or other moving fluids.
Magnetic resonance imaging apparatus