It uses X-rays and computer processing to create detailed pictures of the blood vessels. It is especially helpful in evaluating your risk for a stroke or investigating dizzy spells.
Common Indications for CTA Carotid
Your doctor may request a CTA Carotid for:
- Recent ischemic stroke or transient ischemic attack (TIA, or "mini-stroke").
- Evaluating suspected carotid artery stenosis (narrowing of the arteries due to plaque).
- Vertebrobasilar insufficiency, which can cause symptoms like dizziness, vertigo, double vision, or trouble speaking.
- Suspected tears in the artery walls (dissections) due to trauma.
- Following up on an abnormal ultrasound of the neck.
What does the CT scanner look like?
The scanner looks like a large, wide, circular ring. You lie on a narrow table that moves through the center while images are captured.
What happens during a CTA Carotid scan?
You will lie flat on your back with your head resting comfortably in a cradle. An IV line will be placed in your arm, and contrast dye will be injected quickly. The table will move through the scanner as the pictures are taken. You will be asked to hold your breath and stay very still to avoid blurry images.
Do I need to prepare for a CTA Carotid scan?
Usually, you will be asked to fast for a few hours before the scan due to the contrast dye. You should also inform the clinic if you have kidney problems or allergies to contrast dye.
Can I eat or drink before my CTA Carotid scan?
You can generally drink clear liquids, but you may be asked to hold off on solid foods for a few hours before your appointment.
How long does a CTA Carotid scan take?
The scan itself is extremely fast, usually taking less than 5 minutes. Plan to be at the clinic longer to account for check-in and IV placement.
Are there different types of CTA Carotid scans?
No, a CTA is a specific protocol, though it is very frequently performed at the exact same time as a CTA of the brain to get a complete picture of the blood flow.
Why might contrast be needed?
Contrast dye is required for a CTA. It illuminates the arteries in your neck so the radiologist can easily spot areas where the blood flow is narrowed or blocked by plaque.
Is a CTA Carotid safe?
Yes. The amount of radiation used is considered minimal, and the benefit of preventing a major stroke far outweighs the risk.
Pregnancy Precaution
If you are pregnant or think you might be, inform your doctor so alternative imaging (like an ultrasound or MRI) can be considered.
What are the risks of contrast dye?
Most people tolerate the dye perfectly well. Rarely, it can cause mild allergic reactions or affect kidney function. Always inform the radiographer if you have severe allergies or kidney disease.
Will the scan hurt?
No, the scan is painless. You may feel a brief warm sensation or a metallic taste in your mouth as the contrast dye is injected.
Will I need to remove anything before the scan?
You will be asked to remove necklaces, earrings, hearing aids, and dental work, as metal around the neck will interfere with the images.
What happens after the scan?
You can resume normal activities immediately. If contrast was used, drinking water helps flush it out of your system.
Conclusion
A CTA Carotid is a fast, painless, and vital way to assess the health of the arteries leading to your brain. It provides clear answers that help doctors prevent strokes and manage vascular conditions effectively.