CT Scan Without and With Dye - Head or Brain

This is a test that uses X-rays to create detailed images of the structures in your head and brain.




This is a test that uses X-rays to create detailed images of the structures in your head and brain.



A CT scan of the head or brain uses X-rays to create detailed images of the structures in your head and brain. This is done before and after a dye is put into a vein in your arm or hand. The dye helps to highlight the structures in your chest so they can be seen better.

Here are some things you should know before having a CT scan:

  • A CT scan is painless.
  • You may be told not to eat or drink for at least four hours before the test.
  • You must lie still during the exam. Moving could blur the images.
  • Generally, a complete scan takes only a few minutes. New scanners work even faster.
  • The contrast dye may cause you to feel flushed or to have a bad taste in your mouth for a short time.

Tell your health care provider if there is a chance you could be pregnant.

The costs for this test include the charge for the test (facility charge) and physician charges (for performing or interpreting the test). You may get separate bills from the facility and the physician's office.

What should I ask my health care provider before having this test?

  • Can I eat before the test? If not, how many hours before the test should I stop eating?
  • Do I need to have the test with dye? If I do, should I be concerned if I have allergies?
  • Is there any special preparation for the test? (If so, get clear steps to follow.)
  • What is the reason for the test? Are the test results likely to change my treatment plan? If not, why do I need the test?
  • Are there any less expensive, but effective, alternatives to my getting this test?

Source UHC.com

Also known as:

CT Scan Without and With Dye - Head or Brain
CT Scan
Ear CT Scan
Eye Socket
Eye CAT Scan
Eye CT Scan


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