| 摘要 |
In an exemplary embodiment a unit which can be rotated about vertical axes, essentially comprises an x-ray tube and a film carrier, with a head support arranged therebetween and used for the support of a patient's head. The head support is adjustably arranged in a horizontal plane relative to a mounting therefor so the head can be held in various positions for various object exposures. The adjustable positions are marked on an index field according to the different object exposures and can be selected by means of position selectors. A scanning device having signal indicators is coupled to the position selectors so that the position of the head support relative to its mounting is determined, and so that when the selected position is reached, a signal activates a display element assigned to the respective actuated position selector and arranged in the index field (FIG. 3). |
