Scan time reduction with partial Fourier was investigated for 4D flow MRI of mean velocity and turbulent kinetic energy. It was shown analytically, that PF leads to a loss in resolution for phase images. According to experiments with in-vivo data, the precondition of slowly varying phases is not met for PF reconstructions of 4D flow MRI, making homodyne reconstruction and POCS fail. Therefore, it is concluded, that PF cannot recover missing k-space samples in 4D flow MRI and does not offer a benefit over symmetric k-space sampling with the same number of phase encodes.
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