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How does an MRI work? Top
MRI uses the strength of a magnet to produce clear
pictures of the body without using X-ray (ionizing
radiation).The human body is made up of millions of
atoms, which are magnetic. When placed in a magnetic
field, these atoms line up with the field, much like a
compass points to the North Pole. Radio waves, tuned
to a specific frequency, tip these tiny magnets away
from the magnetic field. When the radio waves are
turned off, the atoms try to realign with the magnetic
field. A powerful antenna picks up these signals and
sends them to a computer, which performs millions
of calculations to produce a black-and-white image,
similar to a photograph negative, for diagnosis.
What should you expect during an MRI scan? Top
The MRI scanner is a large, tunnel-shaped magnet.
You will lie on a cushioned table. When you
are comfortably positioned, the table will move
through the magnet, acquiring images of your
body.The technologist will leave the room during
the examination, but will be able to hear, see and
talk to you throughout the procedure.We also
offer you a choice of various musical styles to
listen to, which many patients find relaxing
during the exam.
Our state-of-the-art MRI suite offers maximum
patient comfort and shorter exam times.The system
has a spacious, well-lit opening on both ends.
The complete exam usually takes less than an hour,
depending upon the part of the body being scanned.
The exam consists of several image sequences lasting
just a few minutes each. When each sequence begins,
you will hear a thumping sound. Other than sound,
you should experience no unusual sensation during
scanning. It is important that you remain relaxed
and as still as possible, because motion may blur the
images. If you would like earplugs, please ask
the technologist.
During the exam, you may be given an injection of a
substance called gadolinium through an IV. In specific
instances, i.e., extreme claustrophobia or severe pain,
sedation may be arranged for you by your referring
physician and center staff.
For your personal safety Top
The MRI exam poses no risk to the average patient
when appropriate safety guidelines, as described below,
are followed.
For us to provide quality patient care in a safe
environment, you must answer specific screening
questions before the MRI scan.Your responses will allow
the MRI staff time to resolve any problems, thereby
avoiding difficulties and delays on the day of the exam.
Please review the following list and, if any
categories apply to you, contact the Nursing staff
at the Rose Imaging Center at 248-932-3200.
- Cardiac pacemaker
- An artificial heart valve
- Cerebral aneurysm clips
- History of open-heart surgery
- History of or presently have metal fragments in your eyes
- Metal plate, pin or other metallic implant
- Intrauterine device, such as a Copper-7 IUD
- Neurostimulator
- Ear prosthesis/cochlear implant
- Permanent (tattoo) eyeliner
- Previous gunshot wound, shrapnel
- Pregnancy or breast-feeding
- Claustrophobia
- Inability to lie flat or still for any length of time
Any metallic substance on your person can affect the
quality of the diagnostic images. It can also cause discomfort
or injury to you when you are placed in the magnetic
field, and we may not be able to perform the exam.
The day of your MRI exam Top
You should expect to be at the Rose Imaging Center
for approximately one to one-and-one-half hours. Please
arrive promptly at your appointed time.We allow
for approximately one-half hour of preparation time
before your actual exam begins.
Please remember to bring the following items with you
when you come:
- Your insurance card and any referral/authorization forms.
- Picture identification.
- The prescription from your doctor.
Please refrain from eating or drinking for two hours
prior to your exam; four hours if you will need sedation.
You may take any prescribed medications, if needed.
Small sips of water are permissible.
Wear comfortable clothing without any metallic
attachments, although certain exams require
changing in to a hospital gown. Makeup and hair
spray may alter the images; please refrain from
their application.
The magnetic field can erase credit cards, alter
calculators and watches and is powerful enough to
attract objects if carried too close.You will be asked to
remove jewelry, wallets, watches, dentures, keys, loose
change, hairpins, etc.These personal items will be
secured in a locked area and will be returned to you
following the exam.
The results of your MRI or CT Top
Your MRI or CT images will be interpreted by our boardcertified,
fellowship-trained radiologists.The results will be
sent to your physician, usually within 48 to 72 hours.
If you require sedation, please call the Nursing staff at
248-932-3200 for special instructions.
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