1. Device for iterative reconstruction of images recorded by at least two imaging methods, the device comprising: an extraction module, which is configured to extract a first set of patches from a first image recorded by a first imaging method and to extract a second set of patches from a second image recorded by a second imaging method; a generation module, which is configured to generate a set of reference patches based on a merging of a first limited number of atoms for the first set of patches and of a second limited number of atoms for the second set of patches; and a regularization module, which is configured to perform a joint regularization of the first image and the second image by means of the generated set of reference patches.