CT angiography is a medical test that uses a CT scan and a dye to show blood vessels and tissues in your body. Learn about the reasons, risks, and preparation for this test from Johns Hopkins Medicine. However, for abnormal CT angiography findings, such as blockage or narrowing of one or more blood vessels, the patient may need a standard angiography as a follow-up. Q: Which angiography is best for detecting heart problems? A: CT angiography or CT coronary angiography is considered the most accurate method to detect heart problems. A CT angiogram is an imaging test that makes 3D pictures of your blood vessels. It uses CT scans and contrast dye. Learn how it works and how to prep. 64 Slice CT Angiography is a non-invasive procedure that helps in detecting minute blockages of the arteries of the heart. The images obtained through this procedure are sharp and crystal clear, enabling cardiologists to spot even the smallest of blockages at a very early stage.