Cardiac CT scan image of left anterior descending coronary artery (LAD) and right coronary artery (RCA). Ao: aorta. Though the distal LAD appears tapered, it could be due to change in the plane as this is only a tomographic section and not a total angiographic image of the LAD. Proximal RCA is seen well. Only a short portion of the left circumflex coronary artery (LCX) is seen arising from the left main coronary artery (LMCA) [not marked] just beyond the aorta (Ao).
Cardiac CT scan image of left circumflex (LCX) coronary artery in the atrioventricular (AV) groove, seen arising from the aorta (A0). Though only a short segment of the LCX is seen in the previous view, a good extent is seen in this section. Hence caution has to be exerted before committing that a short segment visualised is the stump of an occluded artery as the segments may become invisible when the plane of imaging changes in tomographic images.
Cardiac CT scan image of left main coronary artery (LM), left circumflex (CX) coronary artery and right coronary artery (RCA). The left main and RCA are seen arising from the left and right coronary sinuses of the aorta (Ao). The non coronary sinus of the aorta from which no coronary artery arises is also seen. These are the sinuses of Valsalva.
Cardiac CT image of right coronary artery (RCA), seen almost to the full extent, including the bifurcation. Right ventricular branch is also seen. The cross sections of the left ventricle and aorta are seen filled with contrast. A portion of the left coronary system is also seen incompletely on the right side of the image (not marked).