A processing apparatus for processing cardiac data of a living being, the processing apparatus (13, 21; 30) comprising: - a fractional flow reserve providing unit for providing a distribution of fractional flow reserve values being indicative of the fractional flow reserve of different coronary arteries of the living being, - a myocardial perfusion providing unit for providing a distribution of myocardial perfusion values being indicative of the myocardial perfusion of different portions of the myocardium of the living being, - an assignments providing unit for providing assignments between coronary arteries and portions of the myocardium of the living being, wherein the assignments define which portion of the myocardium is fed by which coronary artery, - a correspondence determining unit for determining degrees of correspondence between fractional flow reserve values and myocardial perfusion values based on the distribution of fractional flow reserve values, the distribution of myocardial perfusion values and the assignments between the coronary arteries and portions of the myocardium, characterised in that - the fractional flow reserve providing unit is adapted to determine the distribution of fractional flow reserve values based on a provided three-dimensional geometry of the coronary artery tree; - the processing apparatus further comprises a heart model providing unit for providing a cardiac model, wherein the cardiac model models at least different portions of the myocardium fed by different coronary arteries, and - the assignments providing unit is adapted to register the cardiac model to the provided three-dimensional geometry of the coronary artery tree for determining the assignments between coronary arteries and portions of the myocardium. - a fractional flow reserve providing unit for providing a distribution of fractional flow reserve values being indicative of the fractional flow reserve of different coronary arteries of the living being, - a myocardial perfusion providing unit for providing a distribution of myocardial perfusion values being indicative of the myocardial perfusion of different portions of the myocardium of the living being, - an assignments providing unit for providing assignments between coronary arteries and portions of the myocardium of the living being, wherein the assignments define which portion of the myocardium is fed by which coronary artery, - a correspondence determining unit for determining degrees of correspondence between fractional flow reserve values and myocardial perfusion values based on the distribution of fractional flow reserve values, the distribution of myocardial perfusion values and the assignments between the coronary arteries and portions of the myocardium, characterised in that - the fractional flow reserve providing unit is adapted to determine the distribution of fractional flow reserve values based on a provided three-dimensional geometry of the coronary artery tree; - the processing apparatus further comprises a heart model providing unit for providing a cardiac model, wherein the cardiac model models at least different portions of the myocardium fed by different coronary arteries, and - the assignments providing unit is adapted to register the cardiac model to the provided three-dimensional geometry of the coronary artery tree for determining the assignments between coronary arteries and portions of the myocardium.