4D flow MRI assessment of right atrial flow patterns in the normal heart – influence of caval vein arrangement and implications for the patent foramen ovale - Fig 1

<p>Manual identification in a control subject of a) right atrial and b) left atrial regions of interest (red contours) in the axial plane (depicted during late ventricular systole/atrial filling phase) colour coded according to direction of the flow and c) generation of a three dimensional time-averaged phase contrast angiogram viewed from the right posterior aspect.