1. A method for performing flow acquisition within a sequence of images being a sequence of magnetic resonance images, comprising a processor: commencing an acquisition of a sequence of images; automatically detecting one or more landmarks from within one or more long axis cardiac images of the sequence of images, the one or more landmarks including a valve point; propagating the detected one or more landmarks across subsequent images of the sequence of images, including applying a deformable registration of the detected one or more landmarks across the subsequent images to predict a position of the one or more landmarks, wherein propagation comprises transforming a landmark from a starting phase to another phase using deformation fields and the deformation fields are computed using an inverse-consistent deformable registration algorithm; fitting an image acquisition plane to the propagation of landmarks in long axis cardiac images; and determining one or more flow properties from the sequence of images within the fitted image acquisition plane.