The invention relates to a dual-modality imaging system and a method for dual-modality imaging, wherein a positron emission tomography (PET) scanner for acquiring PET imaging data and at least one optical imaging detector for acquiring optical imaging data are arranged to acquire the PET imaging data and the optical imaging data of an imaged object (5) simultaneously (i.e. at the same time and at superimposed fields-of-view). The at least one optical imaging detector is a non-contact optical imaging detector.
