The X-ray CT device has a ring anode (1) which receives an electron beam (2) whose intensity distribution is measured at different points on the ring anode in an on-line operation. The ring anode includes several isolated anode segments (11,12,13) to which a measuring device for intensity distribution (14) and charge distribution is connected. The anode segments are saw-toothed and intermesh. The charge distribution between the anode segments can also be determined. The electron beam can be electronically rotated.
