A fluid injection system comprising an injector head for delivering a fluid to a patient. The injector head comprises a housing, a mechanical interface on a front face of the housing for receiving a disposable syringe, a piston positioned within the housing for connecting to a plunger of the disposable syringe, and an actuation system positioned within the housing for moving the piston. At least one temperature sensor is positioned in the vicinity of the actuation system within the housing of the injector head for generating signals indicative of the temperature of the actuation system. A control system is operationally coupled to the injector head and the at least one temperature sensor for controlling an injection procedure. The control system inhibits operation of the actuation system if a temperature determined by the at least one temperature sensor exceeds a predefined threshold
