The invention aims to provide an electronic X-ray computed tomography unit which permits scanning of about 360<o>. The electron beam (2) is guided in an annular magnet arrangement which has a U-shaped cross-section. The U shape permits guidance of the electron beam (2) to the ring anode (1) and emergence of the X-rays (5). The magnet arrangement is composed of a large number of magnetic elements (9) in which a coil (10) is arranged for excitation purposes on the crossbar of the U. <IMAGE>
