In this work we explore the added incoherence introduced when shifting the undersampling pattern in the phase enconding direction in successive slices, both when doing standard in-plane acceleration in 2D imaging or Simultaneous Multi-Slice (SMS) imaging with CAIPI trajectories. To be able to explore this incoherence, we treat both the 2D imaging and SMS imaging as one volumetric problem where the physically successive slices are forced to be coherent.
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