Method for establishing compensation information to compensate for a bending of a couch in computed tomography, computed tomography facility, computer program and electronically readable data medium

A computed tomography facility for use in processes related to a target region of an object comprising:

• an object table with a couch for the object able to be moved in at least one direction, wherein at least one marker visible in x-ray imaging is provided on or in the couch;
• and
• a control facility, the control facility including,
• a storage, in which a three-dimensional reference dataset of the marker for a non-loaded couch is stored,
• a recording unit configured to record a target region image dataset showing the target region of the object at a recording position of the couch,
• a compensation information establishment unit configured to establish compensation information to compensate for a bending of the couch at the recording position under a weight of the object to be recorded, wherein the compensation information establishment unit has a comparison subunit configured to establish the compensation information from a comparison of the reference dataset with the target region image dataset, the comparison taking place in a projection space, the comparison including establishing at least one comparison image with a recording geometry of an assigned projection image of the target region image dataset by forward projection from the reference dataset, and
• a compensation facility configured to compensate for localization information relating to the target region.