An angiogram is a medical imaging technique that uses either X-ray, CT scan or MRI to take pictures of the blood vessels. Oftentimes, a special dye (contrast material) is injected into the bloodstream to aid in visualizing blood flow.
It can be used to see the inside of the arteries and veins and may be used to see vessels in the heart, lungs, brain or to see small vessels in the arms or legs. An angiogram shows any restriction in blood flow. For example, if there’s narrowing of the arteries, that indicates a patient may be at risk for a heart attack or stroke.