1. A method for operating a magnetic resonance apparatus, comprising the steps of: in a first examination of a subject, obtaining a first scout dataset, representing magnetic resonance signals from said subject, and subsequently defining a first slice of said subject based on said first scout dataset; in a further, subsequent examination of said subject, obtaining a further scout dataset, representing magnetic resonance signals from said subject; identifying a change in position of said subject between said first scout dataset and said further scout dataset; and defining a further slice of said examination subject dependent on said change in position, said further slice having an identical positioning within said subject as said first slice.