Figure 3.

Comparison of ordinary and nested shift undersampling for 4-fold SUPER-SENSE. Two coils were simulated, each with a step-function profile. With ordinary shift undersampling (top), each voxel has a unique modulation frequency. With nested shift undersampling (bottom), there is no frequency modulation between voxels half-FOV apart, but these voxels are measured by different coils. On the other hand, nested shift undersampling leads to a spectral difference twice as large as that with ordinary shift undersampling, between voxels ¼-FOV apart (double-headed arrows). This leads to reduced overlapping between these voxels compared to ordinary shift undersampling.