The carotid arteries are located in the neck and carry blood to the brain. As one gets older, they can narrow and reduce the flow of blood to the brain. A carotid arteriogram is a special type of x-ray picture to see the blood vessels of neck that carry blood to the brain. It is usually performed in patients who have had a stroke or who have symptoms such as numbness or weakness on one side of the body. Once doctors know where the blockage is, they can suggest the best treatment.