A device for medical imaging of coronary vessels includes a medical imaging device configured to extract a first vessel map from computed tomography angiography data covering at least one reference cardiac phase and a plurality of second vessel maps from three-dimensional rotational angiography data including at least the reference, to generate a plurality of warped versions of the first vessel map aligned with each of second vessel maps, to merge the plurality of warped first vessel maps with corresponding ones of the second vessel maps at different cardiac phases in order to generate a plurality of merged vessel maps of the coronary vessels in the plurality of cardiac cycles.
