1. An examination apparatus for reconstruction of the coronary arteries, the examination apparatus comprising: an X-ray image acquisition device; an X-ray image reconstruction processor; an electrocardiogram device; and a display device; wherein the electrocardiogram device is configured for providing a gating signal; wherein the image acquisition device is configured for acquiring a first gated X-ray image sequence of one of the left and right branches of the coronary arteries with injected contrast agent into the one of the left or right branches of the coronary arteries and for acquiring a second gated X-ray image sequence of the other branch of the coronary arteries with injected contrast agent into said other branch; wherein said processor is configured: for performing gated reconstructions of the left and the right coronary artery and for generating volume data of the coronary arteries; for temporal registration of the volume data of the coronary arteries; for spatial registration of the volume data of the coronary arteries; and for combining the volume data of the coronary arteries and generating a combined coronary artery tree volume data set; and wherein said apparatus is configured for, via said display device, visualizing the combined coronary tree volume data set image.