1. A data processing method for planning an infusion of a medical substance into a target region of an anatomical body part, wherein the medical substance is to be infused using an associated infusion setup comprising the medical substance and an infusion device for performing the infusion, the method comprising: acquiring, on a non-patient-specific basis from an associated atlas storing predetermined standard anatomical data, target region geometry data, the target region geometry data comprising target region geometry information describing a position and a geometry of the target region for which an infusion of the medical substance is intended, and a position and a geometry of an off-target region for which application of the medical substance is intended to be avoided; acquiring, based on the acquired target region geometry data, target coverage data comprising target coverage information describing a planned coverage of the target and off-target regions by the medical substance, wherein the target coverage information comprises information describing a minimum dose of the medical substance to be infused into the target region and information describing a maximum dose of the medical substance to be applied to the off-target region; acquiring, based on selecting a predetermined spatial distribution of the medical substance in the target region based on the target coverage data, relationship data comprising relationship information which describes a relationship between at least one physical parameter of the associated infusion setup and the selected predetermined spatial distribution of the medical substance, wherein the at least one physical parameter describes at least one of a geometric property of the infusion device, a surface property of the infusion device, a fluid dynamic property of the medical substance, and/or time; and determining infusion setup data comprising infusion setup information which describes a planned infusion setup, based on the relationship data and the target coverage data.