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. Author manuscript; available in PMC: 2021 Jan 1.
Published in final edited form as: Magn Reson Med. 2020 Jul 14;85(1):413–428. doi: 10.1002/mrm.28395

FIGURE 4.

FIGURE 4

Spectral responses in the partial Fourier direction across different partial Fourier factors and SNR levels for the CCNN model. “PFC” indicates the partial Fourier cutoff. Ripples can be seen that are related to the Gibbs effect and the PF cutoffs. In the partial Fourier cases, the CCNN response has a cusp in the frequency response at the level of the partial Fourier factor. The response beyond the PFC characterizes the ability to restore the missing Fourier harmonics. At lower SNRs, the PFC singularity gradually disappears, and the CCNN model becomes a low-pass filter, applying more smoothing to compensate for the increased noise. Profiles for the MCNN method were similar, but resulted in smoothing at the lower SNR levels