| 摘要 |
An x-ray diagnostics installation has a detector for the mean image brightness in a predetermined region which is within the x-ray beam path. The detector is formed by a matrix of individually activateable detector elements. A control unit, connected to the detector, has a memory in which data sets are stored respectively corresponding to different anatomical parts and positions of those parts. A selection unit identifies and selects a data set corresponding to the anatomical part currently being examined, and the detector elements in the array corresponding to that part are then activated via the control unit. The radiation incident on the acitvated detector elements is then compared, in the aggregate, to a rated value, and the radiation dose is controlled on the basis on the comparison.
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