1. A method for segmenting a structure in an image data record, comprising: carrying out a first segmentation of the structure in the image data record; obtaining a first final segmentation result from the first segmentation; selecting a region in the image data record based on the first final segmentation result; characterizing a background region by placing a first band at a first, outwardly pointing distance from the selected region; characterizing a structure region by placing a second band at a second, inwardly pointing distance from the selected region, carrying out a further segmentation based on the characterized background region and the characterized structure region; at least one of displaying and saving a final segmentation result of the further segmentation.