Computed Tomography Angiography (CTA)
CTA creates images of arteries throughout the body. A contrast medium (x-ray dye) is injected to make the blood vessels stand out. Pictures are then taken with the CT scanner. The CT images are processed by a computer to make a three-dimensional picture.
Why CTA Is Done
CTA may be used to:
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Examine arteries in the abdomen, neck, lungs, pelvis, kidneys, or brain.
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Look for an aneurysm (ballooning of the blood vessel wall) or dissection (tear).
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See whether a stent (device used to keep an artery open) is working properly.
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Detect damage to arteries due to injuries.
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Gather details on blood vessels that supply tumors.
Preparing for the Procedure
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Drink only clear liquids for 6 hours before the procedure.
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Tell your radiologist what medications, herbs, or supplements you take; if you are, or may be, pregnant; or if you are allergic to contrast medium or other medications.
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Remove hair clips, jewelry, dentures, and other metal items that could show up on the x-ray.
During the Procedure
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You'll lie down on the scanning table. An IV (intravenous) line will be set up.
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The scanning table will be positioned so that the part of your body being examined is inside the donut-shaped CT scanner.
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One image may be taken to be sure you are positioned correctly for the test.
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The IV will be hooked up to an automatic injection machine. This controls the timing and rate of injection. The injection may continue during part of the exam.
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Contrast medium will be injected into a vein through the IV line. You may feel warmth through your body when the contrast material is injected.
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You will need to remain still while the x-rays are being taken. Pillow and foam pads may be used to help you stay in position. You'll be told to hold your breath for 10 to 25 seconds at a time.
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The whole procedure may take 10 to 25 minutes.
Risks of CTA
Potential risks and complications of CTA are minimal and include:
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Problems due to contrast medium, including allergic reaction or kidney damage
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Skin damage from leaking contrast fluid near IV site
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After the Procedure
Online Medical Reviewer:
Desser, Terry, MD
Online Medical Reviewer:
Williams, Scott Thomas, MD
Last Review Date:
10/26/2011
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