Head CT scan

What Is a Head CT Scan?

A head CT scan, also known as a computed tomography (CT) scan, is a common imaging test used to view the structures inside the head, including the skull, brain, and other bones and tissues. It uses X-ray technology to create detailed images of the head, and can help doctors diagnose medical conditions, such as stroke, aneurysms, or brain tumors.

Preparation for a Head CT Scan

If you’re scheduled to have a head CT scan, you’ll need to follow certain instructions to make sure you’re prepared for the procedure. The details of your preparation will depend on which type of CT scan you’re having, as well as the doctor’s instructions. Generally, though, you should:

• Let your doctor know about any medications, vitamins, or supplements you’re taking.
• Follow any dietary instructions, such as fasting for a certain number of hours before the test.
• Discuss any potential risks with your doctor.
• Refrain from wearing jewelry, watches, and other metal objects to the appointment.
• Follow any instructions about removal of hearing aids, dental devices, or other implanted medical devices.

Procedure for a Head CT Scan

Head CT scans are usually performed in a hospital, imaging center, or a doctor’s office. The procedure generally takes 10 to 15 minutes. It may take longer depending on the complexity of the scan and the number of images taken.

During the procedure, you’ll need to stay still while the images are being taken. You may be asked to take deep breaths while the images are being taken. You’ll also need to remain as still as possible to ensure clear images.

Types of Head CT Scans

There are several different types of head CT scans that can be used:

• A standard head CT scan, which produces images of the entire head and neck.
• A contrast head CT scan, which uses a contrast material to make certain structures in the head appear brighter on the CT scan.
• A three-dimensional reconstructed head CT scan, which produces highly detailed images of the brain, skull, and face.
• An angiography CT scan, which uses a contrast material to create detailed images of the blood vessels in the brain.
• A brain perfusion CT scan, which measures blood flow to the brain.

Risks of a Head CT Scan

Head CT scans are considered to be very safe. The radiation exposure from a head CT scan is typically low, so there is low risk of cancer from the procedure. Some people may be allergic to the contrast material used during certain scans. Be sure to tell your doctor if you’ve ever had an allergic reaction to contrast material.

Why a Head CT Scan Is Done

A head CT scan may be ordered to diagnose a range of medical conditions, including:

• Stroke
• Brain tumors
• Hemorrhage and bleeding in the brain
• Infections in the brain, such as meningitis
• Injuries to the brain or skull
• Aneurysms
• Hydrocephalus, a condition that occurs when fluid builds up in the brain

When a Head CT Scan Is Done

A head CT scan may be done for a variety of reasons. It’s typically ordered when a doctor suspects a problem with the brain, but doesn’t yet know the exact cause. It can also be used to monitor the progression of a known disease, such as a brain tumor. In some cases, a head CT scan may be ordered after a head injury or whenever a person experiences symptoms of a stroke.