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Freqently Asked Questions
Q: |
What is MRI? |
A: |
MRI stands for Magnetic Resonance Imaging. Through
the use of a large magnet, radio waves, and a computer,
it is another way to look inside the body without taking
an X-ray. Top |
Q: |
How long have MRIs
been in use? |
A: |
The basic principles of MR have been
in use for various purposes since the 1940s. However,
not until the 1980s have MRI's been approved commercially
by the FDA. Top |
Q: |
How are MRIs different
from X-rays? |
A: |
MRI is so precise, the image taken
is often the same as looking directly at the tissue
(only in black and white). This clarity can lead
to the early detection of disease and helps reduce
the number of some diagnostic surgeries. Early detection
is very valuable since it can lead to early treatment.
Unlike X-rays, there are no known side effects to
MRI. Top |
Q: |
For what types of
medical problems is MRI the most useful? |
A: |
MRI is best at seeing soft tissue.
Therefore, it is very useful for brain and nervous
disorders (stroke, traumatic injuries, fluid in the
skull, tumors, multiple sclerosis, and spinal conditions
or diseases). It is also beneficial for musculoskeletal
problems (ligament, tendon and cartilage injuries)
and subtle bone injuries and tumors. Newer applications
include imaging of the abdominal and pelvic organs
(liver, kidneys, pancreas, uterus and ovaries). MR
can also evaluate the heart and blood vessels. Top |
Q: |
How does an MRI
work? |
A: |
The body is made up of tiny particles
called atoms. Protons located inside the atoms continually
spin at random. The magnetic field from the MRIs
magnet makes the protons line up together and spin
in the same direction. Then, a radio frequency signal
is beamed into the magnetic field. This signal disrupts
the protons, causing them to spin out of alignment.
By then turning the signal off, the protons return
to their aligned position and release energy. A receiver
coil measures the energy released by the disrupted
protons, and the time it took the protons to return
to their aligned position. This data tells us about
the type of tissue where the protons are located
and its condition. Now, with this information gathered,
a computer can construct an image on a monitor which
can be recorded on film or magnetic tape for future
reference. Top |
Q: |
Are there any risks
to MRI? |
A: |
At this time, there are no known
significant side effects. There are, however, some
patients who are not eligible for an MR study (for
instance, if you have a pacemaker). Top |
Q: |
Will my doctor process
the MRI results from start to finish?? |
A: |
A radiologist specializing in MRI
will first examine the images and help determine
a diagnosis. These results will then be shared with
your doctor. Top |
Q: |
How long does the
MRI exam take? |
A: |
Exam times vary depending on the
area being examined and the complexity of the case,
but generally run under one hour. Top |
Q: |
How soon can I
schedule myself for the MRI? |
A: |
In routine MRI scanning, we can normally
schedule you within two to four working days. If
you are an emergency case (or very urgent), we can
schedule you the same day, but we will need your
doctor to call us and talk to our staff regarding
the particulars of your case for same day approval.
Top |
Q: |
Is an MRI exam painful? |
A: |
No. However, we commonly have to
give an injection of a contrast agent (Gadolinium)
for the MRI. This is given normally in a vein in
your arm. Top |
Q: |
What if I am claustrophobic? |
A: |
Approximately 10 percent of the population
has some degree of claustrophobia. Most of these
patients can still be scanned in our hi-field tunnel
magnets. Occasionally, a patient will need oral or
in severe cases IV sedation for the hi-field scanner.
We also offer a lower field OPEN MRI scanner for
most exams. (There are, however, a few types of MRI
studies which can only be done in the hi-field magnet
scanner). Top |
Q: |
What does the exam
cost? |
A: |
Again, this varies somewhat with
the type of MRI exam being performed, but generally
around $1,200. This includes the radiologist reading
fee and an extra set of films (no hidden fees). Top |
Q: |
Can I still have
the MRI test if I have...? |
A: |
Dental Work - Yes, but you should
remove anything that can be removed just prior to
the exam.
Limb/Joint Prosthesis - Yes, but images on the
area of the metal may be blurred or obscured.
Pacemaker - No.
Hearing Aid - Yes, but you must be able to remove
it before the test or it may be ruined.
Implanted Infusion Pump - No.
Pregnant - Probably yes, but case details need
to be discussed with your physician and a consent
form signed.
Metallic Foreign Bodies - Depends on how large
and where they are located, you may need X-rays of
the area before a determination can be made to assess
you.
Please refer to the MR Patient Checklist for complete
eligibility. This checklist must be completed and
signed before you can have the MRI. This is for your
own safety. Top |
Q: |
Should I bring with
me any previous MRIs, CTs, or X-rays of the area
for comparison? |
A: |
Yes! Top |
Q: |
How do I prepare
for the MRI study? |
A: |
Generally, no preparation is necessary.
If you are having a scan of your abdomen or pelvis,
it is helpful not to eat or drink approximately four
hours prior. It is encouraged that you make a trip
to the washroom right before your scan (so you will
not have to go during it). You generally can stay
on any medication you normally take. Wear comfortable
clothes. Do not forget your insurance information
and do not forget to bring any previous MRI or related
exams with you for comparison. Top |
Q: |
Can someone be in
the scan room with me or can I be in the room with
my child? |
A: |
Yes, as long as the person with you
fulfills the criteria on the MRI patient checklist.
Top |
Q: |
Is the MRI exam
covered under my insurance |
A: |
Almost always yes. Our staff will
contact your insurance company to verify coverage
and let you know. Do not be afraid to ask them how
much the exam will cost, and how much the insurance
will cover. Do not forget your deductible and to
mention any supplementary insurance that you may
have. Bring this information with you when you come.
Top |
Q: |
How long before
my doctor gets results? |
A: |
Usually within 24-48 hours for non-emergency
exams. Top |
Q: |
What type of clothing
should I wear? |
A: |
Wear something comfortable. You may
be asked to change into a gown since much of normal
clothing worn contains metal. Top |
Q: |
Do you have music
during the exam? |
A: |
Yes, on request. This should be of
a calming variety. Remember any music that makes
you want to move, e.g., hard rock is discouraged
since motion degrades the images. Top |
Q: |
What preparation(s)
are necessary if any child needs sedation for the
MRI? |
A: |
The child should have nothing to
eat or drink for at least four hours prior to the
exam time. It is also strongly suggested that the
child be deprived of a full night's sleep prior to
the exam. Top |
Q: |
What can I do to
get the best possible study? |
A: |
Hold still. MRI and the accuracy
of your exam is completely dependant on your ability
to hold still. Top |
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