A method and an apparatus are disclosed for automatically linking at least two medical studies which are associated to different acquisition modalities (CT/PET) and which are subject of post-processing in the context of hybrid imaging. In a preparation phase of at least one embodiment, there is defined a classification scheme according to pre-definable rules, conditions and attributes. In an execution phase for a selected source study of a first modality there is looked for at least one target study of a second modality of the same type according to the rules. Then, the source study is automatically linked to the at least one target study.