mri 5 fourier-transform 3 signal-processing 2 adjoint 1 artifacts 1 channel-compression 1 coil-combination 1 coil-compression 1 density-compensation 1 epi 1 fft 1 linear-algebra 1 linear-operator 1 mathematics 1 matlab 1 noise 1 non-cartesian 1 nyquist-ghost 1 optimization 1 pca 1 phase-error 1 power-spectral-density 1 proof 1 proximal 1 psd 1 psf 1 reconstruction 1 resolution 1 snr 1 spiral 1 svd 1