Magnetic Resonance Imaging (MRI) is one of technology's
most advanced diagnostic tools for today's physician.
It allows your physician to see inside your body
without surgery or the use of ionizing radiation.
MRI uses a powerful magnet, low intensity radio
waves and computer technology to create detailed
images of the soft tissues, muscles, nerves and
bones in your body.
The main component of the MRI system or scanner
is the magnet. This magnet causes your body's hydrogen
atoms to align themselves in such a way as to recieve
radio signals from the magnetic resonance system.
When your body recieves these signals, it reacts
by sending its own radio signals back to the machine.
It is this radio frequency transmitted by your
body that is computer processed and turned into
incredibly detailed images.
There are two types of MRI. Closed MRI is where
the patient is placed in a closed machine, much
like a tunnel. An Open MRI has a clear unobstructed
space on three sides and is much less confining.
MRI is medically safe and there are no known side
effects
Preparing for the Exam
In general, there are no special preparations
before your exams. You may eat, drink, and take
your medications as you normally would. Because
MRI uses a strong magnetic field, metal objects
will interfere with the scan. When you arrive,
you will be given a locker to store and metal objects
you have including all jewelry, hair accessories,
credit cards, etc.
We ask that you wear comfortable, loose fitting
clothing but you may be asked to change into a
hospital gown.
Please check the following list carefully. You
cannot be examined by MRI if you have: a pacemaker,
aneurysm clips in the brain, inner ear implants,
metal fragments in eyes, implanted spinal cord
stimulatory, or IUD.
There are several cases when a paramagnetic agent
(a type of contrast media) may be used, please
tell your physician if you are any of the following:
pregnant or breast feeding, anemic or have a disease
that affects red blood cells, asthmatic or have
other allergic respitory disorders.
Please consult your physician is you have any
questions regarding your eligibility.
The Exam
While the MRI test is conducted you will be asked
to lie on a cushioned table. A device called a
coil will be placed over or under you. When you
are comfortably positioned, the table will move
under the magnet. The technologist will then step
into the control area while staying in constant
contact with you, both visually and through the
intercom system.
As the exam proceeds you will hear a muffled thumping
sound for several minutes at a time. Other than
the sound, the MRI creates no bodily sensation.
The test will last from 30 minutes to an hour
depending on the type of test.
It is very important that you relax and remain
as still as possible. Any movement during this
time will blur the picture.
After the test is complete, the technologist will
help you off of the table and you may get dressed.
Your films will be sent with you. A copy will
be read by the radiologist and results sent to
your physicians.
