A rotating anode disk is balanced in a state where the rotating anode disk is mounted inside an X-ray tube. An adjustment device (54) balances the rotating anode disk in an operating state. The adjustment device includes at least a first plurality (72) of balancing elements (74) which are attached to at least one circular ring structure (76). The balancing elements each include a balancing portion (80) mounted to the circular ring structure via a bending portion (82). The bending portions are configured to be heated to a bending temperature to allow a radial pivoting movement (84) of the balancing portion from a first state (86) into a second state (88) caused by centrifugal forces upon rotation. A center of mass of the balancing portion is closer to a center (90) of the circular ring structure in a first state than the second state.