A device and a method are for operating a computer tomograph and an injector, wherein an injector is used to control injection of a contrast medium and a computer tomograph to control a scanning process. Data regarding operation are transmitted between the computer tomograph and the injector via a data interface, especially in a reciprocal manner. The two devices reciprocally influence their operation, thereby reducing the strain imposed on a patient to be examined, increasing operational reliability and simplifying handling.
