Cardiac CT angiograms are increasing in popularity as a non-invasive screening tool for detecting significant coronary artery disease. The angiograms are reconstructions from 64 or more slice CT scans following intravenous injection of radiocontrast dye. As of now it cannot replace conventional coronary angiograms for assessing the detailed coronary anatomy.
Reconstructed cardiac CT scan image as viewed from the left anterior aspect, showing left main (LM) left main coronary artery, left circumflex (LCX) coronary artery and left anterior descending (LAD) coronary artery. Ao: aorta. Two diagonal branches are also seen arising from the LAD. LCX is occupying the atrioventricular (AV) groove.
Reconstructed cardiac CT image as viewed from the posterior aspect showing the left anterior descending (LAD) coronary artery, left main coronary artery (LMCA), left circumflex (LCX) coronary artery and the coronary sinus (Coron sinus). The main tributaries of the coronary sinus are also seen joining it. A diagonal branch is seen arising from the LAD and an obtuse marginal branch from the LCX (not marked).
Reconstructed cardiac CT image showing the right coronary artery (RCA) in the atrioventricular (AV) groove. The structure to the left of the RCA is the right atrium and that to the left is left ventricle. The left anterior descending (LAD) coronary artery is seen to the left extreme of the image, though it is not visualised well. A diagonal branch of the LAD is also visible.
Distal right coronary artery (RCA) and coronary sinus seen in the atrioventricular (AV) groove seen on the posterior aspect view of reconstructed cardiac CT. Left circumflex coronary is seen adjacent the coronary sinus in the AV groove.