A system for patient imaging is provided. The system includes an imaging system and a parameter generator to determine parameters of at least a first phase of an injection procedure. The imaging system includes a scanner that has at least one x-ray tube. The parameter generator is programmed to determine at least one of the parameters on the basis of a voltage to be applied to the at least one x-ray tube during an imaging procedure. A method of controlling an injector system is also provided, and the method includes determining injection parameters, at least one of which is determined on the basis of a voltage to be applied to an x-ray tube during the imaging procedure, as well as controlling the injector system at least in part on the basis of the determined injection parameters.