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Example k-space trajectory designs for 2 (A), 3 (B) and 4 (C) spokes for one human subject. The spokes were constrained to be symmetrically placed around the origin in the kx-ky plane. In addition, the placement was optimized over a grid defined by different rotation angles ranging from 0 to 170 degrees in steps of 10 degrees and by different separation distances (Δk =1/FOV) with FOV ranging from 8 to 18 cm in steps of 2 cm.
