A computer-implemented method for quantifying the patterns of coronary artery functional disease in a coronary vessel from a patient under hyperaemic conditions, comprising the following steps: - acquiring a set of relative pressure values obtained from: - pressure values obtained at different positions along the coronary vessel between the ostium and the most distal part of the coronary vessel; relative to - the pressure at the ostium of the vessel, - mapping said set of relative pressure values along the coronary vessel length, and determining: - the contribution of the relative pressure drop of the functional disease with respect to the relative pressure drop over the total length of the coronary vessel; and - the extent of the functional disease, which corresponds to: - the length of suspected vessel lesions, with respect to the total length of the coronary vessel; - the length of suspected vessel lesions with relative pressure drops, with respect to the total length of the coronary vessel; or - the sum of the length of segments of the coronary vessel with relative pressure drops that are larger than or equal to a predetermined threshold, with respect to the total length of the coronary vessel. - acquiring a set of relative pressure values obtained from: - pressure values obtained at different positions along the coronary vessel between the ostium and the most distal part of the coronary vessel; relative to - the pressure at the ostium of the vessel, - pressure values obtained at different positions along the coronary vessel between the ostium and the most distal part of the coronary vessel; relative to - the pressure at the ostium of the vessel, - mapping said set of relative pressure values along the coronary vessel length, and determining: - the contribution of the relative pressure drop of the functional disease with respect to the relative pressure drop over the total length of the coronary vessel; and - the extent of the functional disease, which corresponds to: - the length of suspected vessel lesions, with respect to the total length of the coronary vessel; - the length of suspected vessel lesions with relative pressure drops, with respect to the total length of the coronary vessel; or - the sum of the length of segments of the coronary vessel with relative pressure drops that are larger than or equal to a predetermined threshold, with respect to the total length of the coronary vessel. - the contribution of the relative pressure drop of the functional disease with respect to the relative pressure drop over the total length of the coronary vessel; and - the extent of the functional disease, which corresponds to: - the length of suspected vessel lesions, with respect to the total length of the coronary vessel; - the length of suspected vessel lesions with relative pressure drops, with respect to the total length of the coronary vessel; or - the sum of the length of segments of the coronary vessel with relative pressure drops that are larger than or equal to a predetermined threshold, with respect to the total length of the coronary vessel. - the length of suspected vessel lesions, with respect to the total length of the coronary vessel; - the length of suspected vessel lesions with relative pressure drops, with respect to the total length of the coronary vessel; or - the sum of the length of segments of the coronary vessel with relative pressure drops that are larger than or equal to a predetermined threshold, with respect to the total length of the coronary vessel.