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Magnetic Resonance Imaging
WHAT YOU SHOULD
KNOW
A magnetic resonance imaging scan (also called an MRI,
nuclear magnetic resonance [NMR], or a magnetic field scan)
uses a strong magnetic field coupled with bursts of radio waves
to produce detailed images of the internal organs. The pictures
show "slices" through the body at any angle the doctor
requires. Stacked together, these slices provide a
three-dimensional view of the interior.
An MRI machine looks like a large hollow tube with a
table at its center. The machine is usually located in a room
of its own, with its controls situated behind a window off to
the side. Magnetic resonance imaging does not use x-rays; the
scans are harmless and painless. (People who can't tolerate
confined spaces may find them upsetting, however.) A typical
session lasts 15 to 90 minutes.
This type of scan can't be done if you have anything
magnetic in your body, such as metal pins, clips, or plates.
It's also forbidden for people with
pacemakers.
IF YOU'RE HEADING FOR THE
HOSPITAL...
Before You Go
-
If you're going to have dye
injected to improve the contrast of the images, don't eat
or drink anything for 4 to 8 hours before the
test.
-
Do not wear ANY jewelry;
remove all metal from your body. Also take off any clothing
with metal hooks, buttons, or zippers.
-
If you can't stand cramped
places, be sure to tell your doctor. He can prescribe
medicine to help you relax during the scan.
-
MRIs tend to be very noisy.
Ask about head phones to block out the sound.
-
If you're pregnant, tell the
doctor. An MRI should not harm the baby, but the doctor
still needs to be aware of your condition.
What to Expect While You're
There
After putting on a gown, you'll be asked to lie down on
the scanner's table. You may be strapped down to prevent
inadvertent movement. The table will then slide into the
machine. Some models are equipped with mirrors that enable you
to see out. In others, it's impossible to see anything. You
can, however, talk with people outside the machine throughout
the time you're inside.
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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