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Spiral gradients and trajectories. a) Spiral-out read gradient (solid) with rewinding lobe (dashed). b) Spiral-in/out read gradient with prewinding and rewinding lobes. c,d) k-space trajectories for the gradients in (a,b), respectively. Arrows indicate direction of travel in k-space. e) k-space trajectory for second spiral-in/out trajectory, rotated 180° from the trajectory in (d). The redundant spiral-in/out scheme averages data acquired with trajectories (d) and (e).
