Method for controlling fluid accuracy and backflow compensation

A method for controlling fluid ratio accuracy during a dual flow injection with a fluid delivery system including a powered fluid injector, the method comprising:

• selecting, using a fluid control module operatively associated with the powered fluid injector, at least one capacitance correction factor for predicting and compensating for a first capacitance volume of a first syringe comprising a first medical fluid and a second capacitance volume of a second syringe comprising a second medical fluid;
• selecting, using the fluid control module operatively associated with the powered fluid injector, a ratio of the first medical fluid and the second medical fluid to be administered to a patient in the dual flow injection;
• determining, using the fluid control module operatively associated with the powered fluid injector, a relative acceleration ratio of a first piston of the first syringe and a second piston of the second syringe based on the at least one capacitance correction factor, wherein the relative acceleration ratio is selected to maintain the selected ratio of the first medical fluid and the second medical fluid during the dual flow injection;
• and
• injecting a mixture of the first medical fluid and the second medical fluid having the selected ratio with the fluid delivery system.