Fig. 9

REACT-CMRA images in coronal view show a flow-related fat-water separation artifact in typical location, which is commonly observed in dual modified Dixon-based sequences. In the water-only image (A) a hypointense rimed artifact (arrow) is seen within the distal IVC. Fat-only images (B) show high signal in the same location, indicating a signal swapping (the signal of moving water appears in the fat images most likely due to phase shifts between the two echoes). In this case, the in- and out-of-phase images should also be reconstructed, because they usually show regular artifact-free signal, as shown in the presented out-of-phase image (C). Knowledge of the presented artifact is important, as it may mimic vena cava inferior or hepatic vein thrombosis