A diagnostic device for computer tomography and nuclear imaging of a body is provided. The device includes at least one movable robot arm, an x-ray source, and a detector for nuclear radiation. Further, a method for the 3D imaging of a body is provided. The method includes irradiating the body by a moving x-ray source, and acquiring nuclear emission data via readings from a moving nuclear detector, supervising the poses of the x-ray source and the nuclear detector, synchronizing the readings from the nuclear detector and the x-ray source with their respective poses, and calculating 3D images by using the acquired information from the x-ray source and from the nuclear detector.
