Computed Axial Tomography (CAT) Scan
What is it?
A computed axial tomography (CAT) scan is a painless
x-ray test that provides detailed pictures of the inside
of the body. Also called computed tomography (CT) scan.
Who needs this procedure?
A CAT scan is a valued tool for detecting brain and
spinal abnormalities because of the great precision with
which it can show these structures. CAT scans are used to
diagnose brain tumors and strokes; sinusitis; aortic
aneurysms; chest infections; and diseases of organs such
as the liver, kidneys, and lymph nodes in the abdomen.
How do I prepare for this procedure?
There is usually no preparation required for a CAT
scan. However, your doctor may give you special
instructions depending upon the part of the body being
scanned. There are no risks associated with a CAT scan.
However, it does involve a very small amount of radiation.
If you are pregnant, you should notify your doctor. In
some cases, a dye called a contrast agent is injected into
a vein before this procedure to enhance the picture. If
you are allergic to any medications or chemicals like
iodine (found in shellfish), you should let your doctor
know because you will be likely to have an allergic
reaction to the dye.
How is this procedure performed?
A CAT scan is performed in a hospital or an outpatient
center. You will put on a gown and lie down on a table
that moves into the middle of a large, donut-shaped
scanner. It is important that you lie very still or the
picture will be blurry. You may be gently strapped to the
table to help you lie still. Right outside of the CAT scan
room is a smaller room with a window in it. The
radiologist sits in this room and controls the scanning
equipment. A microphone allows the radiologist to talk to
you throughout the procedure. The scanner is able to move
around your body to take the pictures at different angles,
which are then seen on a computer monitor. Many pictures
are taken, and each one provides a view of a different
layer of your body. If your test requires a contrast
agent, the dye will be injected through an intravenous
tube in your vein. Some contrast agents are given in
liquid form. A CAT scan takes approximately 30 to 90
minutes.
What can I expect after the procedure?
There are usually no side effects to this procedure.
Allergic reactions to the dye usually occur immediately,
but are unusual. Signs of an allergic reaction include
swelling and difficulty breathing.
This information has been designed as a comprehensive and quick reference
guide written by our health care reviewers. The health information written
by our authors is intended to be a supplement to the care provided by your
physician. It is not intended nor implied to be a substitute for
professional medical advice.
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