Fasting for 4-6 hours before the scan may be advised, especially if a contrast dye is used. You’ll also need to remove any metal objects around the head or neck to ensure clear images.

The procedure is generally painless. You may feel a warm sensation when the contrast dye is injected, which quickly fades.

The scan typically takes about 15-20 minutes, with the entire appointment, including preparation, lasting up to 30-45 minutes.

While there’s minimal radiation exposure, the scan is generally safe. However, people with kidney issues, allergies to contrast dye, or pregnancy should inform the doctor beforehand.