Cardiac data of a living being is processed by a processing unit comprising a first fractional flow reserve (FFR) providing unit (11) for providing first FFR values being indicative of the FFR of different arteries of the living being, wherein said virtual FFR values were calculated from non-invasive imaging data of arteries of the living being； a second FFR providing unit (12) for providing FFR values measured in the arteries of the living being； a correction unit (13) configured to correct the first FFR values based on the second FFR values； and a display unit (14) configured to display at least one first FFR value and a second FFR value for a corresponding position in the coronary arteries. The first and second FFR values are displayed to a cardiologist, who can base his course of action on the simulated and corrected values.
