Do you need a CT coronary angiogram?

CT coronary angiograms are increasing in popularity as a non-invasive screening test for detecting blocks in coronary arteries. Coronary arteries are blood vessels supplying oxygenated blood to the heart. Angiograms are images of blood vessels, usually obtained by injecting medications for contrast from body structures. CT angiograms are reconstructions from multi slice CT scans following injection of contrast material into a forearm vein.