Figure 3: Qualitative comparison of zero-filling, POCS and DRPF-Net for a combined DW liver image (b = 800 s/mm²). First row: the zero-filled reconstruction is blurred along AP, while POCS exhibits artificial, ringing-like structures most apparent in the left liver lobe. In contrast, the DRPF-Net restores image sharpness without introducing visible artifacts. Second row: difference (5x) to the ground-truth. Third row: phase maps of a selected repetition with phase estimation errors coinciding with the locations of reconstruction errors in the magnitude images.

Figure 1: POCS reconstructions of retrospectively PF-sampled liver images (b = 800 s/mm²) in two representative cases: a) one with relatively smooth phase and b) one with high-frequency phase fluctuations. In a), the phase can be approximately restored using the LR phase estimate shown in the bottom right. However, ringing (white arrows) as well as a grid pattern (orange arrow) are still introduced into the magnitude image. The artifacts in b) are much more severe leading to signal-dropout in the liver (red arrow) whose location coincides with wrong estimations of the phase.