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Computed Axial Tomography
WHAT YOU SHOULD
KNOW
Computed axial tomography (better known as a "CT"or "CAT"
scan) is a special type of x-ray that produces pictures of a
"slice" through the body. Unlike a regular x-ray, which gives
only a "camera's eye" view, a CAT scan shows the various layers
of tissue in any segment of the body.
The CAT scan machine is usually located in a room of its
own. The table on which you lie during your session is located
at the center of a donut-shaped scanner. The x-ray technician
conducting the scan usually sits behind a window at the side of
the room. CAT scans are painless. They typically last about 90
minutes.
IF YOU'RE HEADING FOR THE
HOSPITAL...
Before You Go
-
If you're going to have dye
injected to give the pictures extra contrast, don't eat or
drink anything for 4 to 8 hours before the
test.
-
If you are allergic to
shellfish (lobster, crab, or shrimp), make sure the doctor
is aware of it. People with this allergy could have a
reaction to the dye.
-
Do not wear ANY jewelry to
the test.
What to Expect While You're
There
You may encounter the following procedures and equipment
during your stay.
-
Before the test, you may be
given contrast dye through an IV in your vein. The dye may
make the skin around your IV feel warm. It may also produce
a salty taste in your mouth, and cause headache or
nausea.
-
After putting on a gown, you
will be asked to lie down on the scanner's table. Because
you need to remain as motionless as possible, your head may
be strapped down.
-
When the test starts, the
table will begin to slide into the scanning ring. You may
hear clicking sounds as the ring moves to take pictures. As
the test proceeds, the table may slide deeper into the
ring.
After You
Leave
-
If you were given medicine to
relax during the test, have someone on hand to drive you
home afterwards.
Seek Care Immediately
If...
-
You have trouble breathing.
This is an emergency. Call 911 or 0 (operator) to
get to the nearest hospital or clinic. Do not drive
yourself!
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