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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: IEEE Trans Med Imaging. 2020 Nov 30;39(12):4357–4368. doi: 10.1109/TMI.2020.3017450

Fig. 3.

Fig. 3.

(a) Compared to the fully sampled trajectory, the designed single-shot variable-density spiral trajectory for each time frame or kz plane enables a 12-fold acquisition acceleration. (b) Prospective 2D undersampling pattern with the incoherent rotations between fast time (the oscillation dimension) and slow time (the fMRI time dimension). (c) 3D undersampled stack-of-spirals providing a 10-fold acceleration with one spiral for the outer kz planes, two spirals for the two central kz planes, and golden-angle rotations between kz planes.