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Q:
What is the difference between CT and MRI?
A:
Computed tomography (CT) imaging, also known as "CAT
scanning" (Computerized Axial Tomography) provides
a form of imaging which utilizes advanced technology and
x-rays to generate an image. CT imaging systems produce
cross-sectional images or "slices" of anatomy,
like the slices of an orange. A patient lies on a table
which then moves him or her through a circular opening in
the CT imaging system where the images are taken. Using
advanced computerized technology, the CT equipment translates
the images into "slices" of the patient's body.
CT Scans are good for imaging all parts of the body. CT
is also a very fast study. With advanced CT Scanners, we
are able to scan a patient usually in less than a few minutes.
MRI stands for Magnetic Resonance Imaging. MRI uses radio
frequency waves and a magnetic field to create an image.
MRI does not utilize radiation. Instead, radio frequency
waves are  directed
at the protons which are found in the body's hydrogen atoms.
Once placed in the magnetic field of the MRI, the protons
emit radio signals that are processed to form an image.
For most MRI procedures, the patient lies on a table which
slides into a cylindrical scanner. MRIs take about 30 minutes.
MRIs allow radiologists to evaluate many different types
of tissues including ligament and muscles from many different
angles.
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