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Magnetic
Resonance Imaging (MRI)
One of the most advanced diagnostic imaging methods available, the MRI provides
detailed information about the body and is often used to evaluate the spine.
Unlike plain X-rays, this non-invasive test not only shows the physician the
bones, but also provides excellent details of the soft tissues. The MRI is
helpful in diagnosing any condition in which the anatomy of the spine and its
soft tissues need to be seen clearly, including degenerative
disc disease,
herniated disc, spinal
stenosis, kyphosis, sciatica, scoliosis and tumors and
infections of the vertebrae. However, since the MRI is more expensive and generally
takes longer than the X-rays or CT
scans, it is usually not the first test
given.
Instead of X-rays, a MRI uses
magnetic waves to take pictures of the spine. A magnet excites
the hydrogen atoms in the body, which give off electromagnetic
waves that are recorded by a computer. The computer then analyzes
the results to reconstruct an image of the spine.
The MRI scanner is a large tube
with a table passing through it. Some people worry about feeling
closed in; however, the tube always remains open on both ends.
You won’t feel any pain, but you will hear some loud
noises during the exam. Depending on how many pictures are
needed, the exam can take anywhere from 20 minutes to 90 minutes.
It is very important that you
notify your physician if you have any metal in your body which
cannot be removed, such as a pacemaker, aneurysm clips or prosthesis.
You may not be able to have an MRI if you have such metal in
your body. Leave your jewelry at home, and remove all metallic
objects, such as hearing aids and dentures, before entering
the scanning room. There are “open” and “closed” MRIs;
unless you are claustrophobic, a closed MRI is always performed.
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