A fluid injection apparatus, comprising: at least one pressurizing system; at least a first fluid path operably connectible to the at least one pressurizing system to transport a contrast fluid pressurized by the pressurizing system, the at least a first fluid path comprising a first tubing set and a first catheter; a fluid heating system configured to determine a temperature of the contrast fluid; a control system operably associated with the at least one pressurizing system, the fluid heating system, a processor system, and an input system for receiving an injection protocol specifying a first flow rate according to which the contrast fluid is intended to be injected into a patient; a model stored in a memory system and executable by the processor system to determine whether a pressure threshold value would be reached in the at least a first fluid flow path were the injection protocol initiated using the first flow rate using the contrast fluid at the temperature determined by the fluid heating system, wherein the processor system, in response to determining that the pressure threshold value would be reached in the at least a first fluid flow path were the injection protocol initiated using the first flow rate, is configured to automatically change the temperature determined by the fluid heating system to update the injection protocol to create an updated injection protocol so that the expected pressure level is determined via the model to be less than or equal to the pressure threshold value thereby enabling the updated injection protocol to be carried out with the fluid heating system heating the contrast fluid to the changed temperature. at least one pressurizing system; at least a first fluid path operably connectible to the at least one pressurizing system to transport a contrast fluid pressurized by the pressurizing system, the at least a first fluid path comprising a first tubing set and a first catheter; a fluid heating system configured to determine a temperature of the contrast fluid; a control system operably associated with the at least one pressurizing system, the fluid heating system, a processor system, and an input system for receiving an injection protocol specifying a first flow rate according to which the contrast fluid is intended to be injected into a patient; a model stored in a memory system and executable by the processor system to determine whether a pressure threshold value would be reached in the at least a first fluid flow path were the injection protocol initiated using the first flow rate using the contrast fluid at the temperature determined by the fluid heating system, wherein the processor system, in response to determining that the pressure threshold value would be reached in the at least a first fluid flow path were the injection protocol initiated using the first flow rate, is configured to automatically change the temperature determined by the fluid heating system to update the injection protocol to create an updated injection protocol so that the expected pressure level is determined via the model to be less than or equal to the pressure threshold value thereby enabling the updated injection protocol to be carried out with the fluid heating system heating the contrast fluid to the changed temperature.