one or more systems and / or techniques are described for generating volumetric data from both radiographic and ultrasound examinations of an object , where the radiographic volumetric data and the ultrasound volumetric data are representative of a substantially same volumetric space of the object . this allows , for example , corresponding portions of the volumetric data and / or images resulting therefrom to be identified for comparison via the different modalities . moreover , in one embodiment , a compression paddle of a mammography examination apparatus is configured to selectively receive an ultrasound component .