A method is for operating a system for contrast-agent based medical imaging including a medical imaging device and a contrast-agent-injection device. In an embodiment, the method includes outputting a first operating element for operating the medical imaging device via a touch-sensitive screen； inputting a first piece of information for operating the medical imaging device via the touch-sensitive screen using the first operating element； outputting a second operating element for operating the contrast-agent-injection device via the touch-sensitive screen； and inputting a second piece of information for operating the contrast-agent-injection device via the touch-sensitive screen using the second operating element.
