How to Read a CT Scan of the Head

What is a head CT?

Computed tomography, more commonly known as a CT or CAT scan, is a diagnostic medical imaging test. Like traditional x-rays, it produces multiple images or pictures of the inside of the body.

A CT scan generates images that can be reformatted in multiple planes. It can even generate three-dimensional images. Your doctor can review these images on a computer monitor, print them on film or via a 3D printer, or transfer them to a CD or DVD.

CT images of internal organs, bones, soft tissue, and blood vessels provide greater detail than traditional x-rays. This is especially true for soft tissues and blood vessels.

CT scanning provides more detailed information on head injuries, stroke, brain tumors, and other brain diseases than regular x-rays.

 

What are some common uses of the procedure?

Doctors typically use head CT to detect:

  • bleeding, brain injury and skull fractures in patients with head injuries.
  • bleeding caused by a ruptured or leaking aneurysm in a patient with a sudden severe headache.
  • blood clot or bleeding within the brain in a patient with symptoms of a stroke.
  • a stroke, especially with a technique called CT perfusion of the head.
  • brain tumors.
  • enlarged brain cavities (ventricles) in patients with hydrocephalus.
  • diseases or malformations of the skull.
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