Fig. 3.
Simulations. The fMRI signal was simulated for the TRs applied in Fig. 2C. The subplots demonstrate the simulation results for parameters indicated in the leftmost box. The apparent displacement of the whole volume was Δz, except for the subplots marked edge, where Bz remained constant at slices below the one observed. T1 values of the simulations are shown. Transition width as a percentage of full-width at half-maximum (key: bottom right) indicates the steepness of the slice profile. Both measurements and simulations show that the signal, after step changes of Bz, is modulated to a new level through periods of similar transient deflections.