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. Author manuscript; available in PMC: 2017 Oct 11.
Published in final edited form as: Magn Reson Med. 2015 Aug 26;76(2):380–390. doi: 10.1002/mrm.25896

FIG. 2.

FIG. 2

Change in peak gradient (a)/slew-rate (b) strength and the number of needed spatial interleaved shots (c), as a function of spatial resolution (Nx). Blue corresponds to the fastest acquisition [Schirda et al (10)], which pushes the gradient system the most, with least amount of spatially interleaved shots. Red circles correspond to a PI/PREP-like acquisition (trajectory depicted in Fig 1b), with the lowest demands on the gradient system and the most amount of shots needed to cover (kx, ky), π · Nx The solid red line corresponds to a circle-like acquisition (depicted in Fig 1c), with same gradient strength (a), but twice the slew rate of the PI/PREP-like acquisition (b). However, for typical brain SI acquisitions (NX < 64), the slew rate needed for circle-like trajectories is still substantially lower than for the fastest acquisition (b) and the number of excitations needed is twice as low as for the PI-like acquisition, π · Nx/2 (c).