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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: IEEE Trans Med Imaging. 2014 Apr;33(4):961–969. doi: 10.1109/TMI.2014.2300500

Fig. 2.

Fig. 2

Diagram of the implementation of the system matrix A, composed of three sequential operators: the NUFFT operator F, the excitation profile modulation operator P and the sampling operator R. The solid dots in a) and b) represent the acquired samples in k-space and the hollow circles denote the locations which are interpolated by NUFFT but not acquired by the sequence.