WHAT IS
A CT SCAN?
CT (computerized Tomography) or CAT
Scan is an x-ray technique that uses a special scanner to create
cross-sectional images of the body and head. This produces “slices”
like the slice in a loaf of bread. Our CT scanner performs helical
slices-the newest and fastest scanning technology available.
CT’s can image the internal
portion of the organs and separate overlapping structures precisely.
Unlike standard x-rays which take a picture of the the structure
being examined, CT has the ability to image that same structure
one slice at a time. This allows the internal body area being
examined to be viewed in much greater detail than with standard
X-rays. CT is also able to provide clear imaging of both soft
tissue as well as bone.
Because a CT scan uses an
ultra-thin, low dose X-ray beam, radiation exposure is minimized.
WHAT WILL HAPPEN DURING THE EXAM?
When you enter
the exam room, you will be asked to lie on the CT table. The
technologist will explain the procedure to you and position
you on the scanning table. The table will then move to center
on the body part being examined. You will be able to see out
both ends of the scanner, and you will be able to talk to your
technologist via a two-way microphone. The table will move within
the scanner during the exam. It is normal to hear whirling or
clicking noises while the exam is being done.
While the exam
is being done, all you need to do is relax and remain as still
as possible. You may be asked to hold your breath for short
periods of time. You may be asked
to drink an oral contrast to fill your stomach and intestines.
An intravenous injection may also be required for your CT scan.
Daily medications may be taken with a sip of water. If you have
had a recent plain x-ray or other images of the area to be scanned
please bring them with you.
PREPARING FOR THE CT SCAN
You should wear
comfortable, loose fitting clothing. You will want to be comfortable
while you wait and during the test. Depending on the type of
scan you are having, you may be asked to change into a gown
for your procedure. You should not eat or drink anything for
2- 4 hours prior to your appointment time as intravenous contrast
may be used. You may be requested to have a lab test performed
prior to your appointment to check to see how your kidneys are
functioning, especially if you are diabetic.
Intravenous contrast
"highlights" the vasculature in the area that is scanned
making certain abnormalities easier to see. If you have had
a previous reaction to intravenous contrast (X-ray dye), call
and speak with our nurse about your reaction prior to coming
in. Depending on the reaction, we can call your doctor and have
you "pre-medicated" 24 hours prior to your appointment
with an antihistamine and steroid.
AFTER THE
SCAN
A radiologist
will provide your doctor with an interpretation of the CT scan
images. Your body will excrete the
IV contrast through your urine. This will not discolor your
urine or cause you pain. This will be gone in 24 hours, so it
is important to drink plenty of fluids to help your body get
rid of the contrast.
CT
Exam Prep
