CT Angiography

A CT angiogram (CTA) is a CT with intravenous contrast that shows arteries and veins in detail. It is often used as a less invasive alternative to conventional angiography.

What it is used for

CTA is used to assess narrowing or blockage of blood vessels, aneurysms, aortic dissection, and congenital vascular abnormalities. It is also commonly used to view vessels in the brain, neck, heart, and legs.

For suspected pulmonary embolism, a CT pulmonary angiogram (CTPA) is often the main test to confirm a clot in the pulmonary arteries.

Contrast injection

Iodinated contrast is injected through a vein in the arm, and scanning starts when the contrast reaches the area of interest. Timing matters so that vessels appear bright and clear.

A warm sensation or the urge to urinate is common as contrast enters the bloodstream. This is generally temporary and harmless.

Risks and preparation

Patients with kidney disease, diabetes taking metformin, or a history of contrast allergy should be assessed by a doctor beforehand. Adequate hydration is often advised.

Contrast can cause mild reactions such as itching or redness. Severe reactions are rare, but medical facilities are always prepared to manage them.

Key points

• Used to assess narrowing or blockage of vessels.
• Patients with kidney problems should be evaluated first.

Educational information, not a substitute for medical advice.