Positron Emission Tomography (PET)
How It Works
PET scan of melanoma
9.0 mCi 3min em, 45
sec tr
Images courtesy of University of Sherbrooke
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Positron emission tomography, or PET, is a painless
diagnostic test that allows radiologists to get a unique view, at
the chemical level, of the body's functions. The PET scan is different
from an x-ray or CT scan in that it looks at the body's metabolic
activity and provides information on the chemical level.
During a PET scan, a radioactive tracer is injected
into the body and is tracked as it moves through organs. The tracer
is a radiolabeled form of glucose known as fluorodeoxyglucose (FDG).
The radiation exposure associated with PET is safe and lower than
that associated with conventional CT scanning. The PET scanner detects
and records the signals the tracers emit. These signals are then
reassembled into actual images through a computer.
Almost all diseases alter the body's biological processes.
PET is able to discover these changes in their earliest stages,
often before any symptoms appear, and can provide physicians with
important and accurate information. When physicians can detect cancers
early in their development, they can initiate treatment plans sooner.
For many cancers, early detection is a key to successful recovery.
A PET scan may also eliminate the need for other diagnostic procedures
and may prevent unnecessary surgical procedures.
For more information about PET at Rhode Island Hospital
or to schedule an physician-referred appointment, please call 401-444-7383.
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