Cranial CT scan
Alternative names:
CT scan of the head; CT scan of the skull; head CT
How the test is performed:
Remove all jewelry, dentures, glasses, or other metal from your head and neck. You lie face up on a movable table called a gantry, and your head is positioned inside the CT scanner. During the test, you must remain still.
Your head is immobilized and your face is left uncovered. X-rays are passed through the head in sections, or slices. A contrast-media (dye) may be injected into a vein to help define certain tissues. Each exposure takes a few seconds and the machine will make an audible hum. The table will move slightly (1/4 to 1/2 inch) between each scan to align for the next cross-section image. A sound system is built into the machine to allow for communication between the technician and you during the test.
The total amount of time in the CT scanner is 1/2 to 1 hour.
How to prepare for the test:
Usually any preparations are done just prior to the scan, such as removal of jewelry and the injection of a contrast dye. There is no restriction of food or fluids. You must sign a consent form.
Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:
How the test will feel:
If a dye is needed, there will be the small amount of pain when the needle is inserted, and shortly thereafter. Other than that, the CT is painless.
Why the test is performed:
A CT scan is recommended over other tests to determine: CT scans are also used to view the facial bones, jaw, and sinus cavities.
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