An X-ray system includes a plurality of X-ray detector modules and a backbone for positioning the detector modules relative to an X-ray source. A mount for each detector module is coupled to the backbone. One or more actuators extend between the mount and the detector module for individually adjusting the detector module relative to the mount for aligning the detector module. A plate with a rocker member may be attached behind each module and the mount then includes a frame with cradle surfaces for the rocker member.