Word parts
What it means
A PET scan shows function, not just structure. A tracer, often a radioactive form of glucose, is injected and collects in tissues that use a lot of energy, such as many cancers, active areas of the brain, or inflamed tissue. It is often combined with a CT scan (PET-CT) to show exactly where the activity is. It is used to find and stage cancer, check heart muscle and study brain disorders.
For the nurse
The client usually fasts for several hours before; blood glucose is checked, since high sugar can affect results. Teach them to drink fluids afterward to help clear the tracer.
At a glance
| Abbreviations | PET |
|---|---|
| Spanish | tomografía por emisión de positrones |
| Also written | PET scan, PET scans, PET, PET-CT |
Related terms
computed tomography
An imaging test that uses x-rays and a computer to make cross-section pictures of the inside of the body.
magnetic resonance imaging
An imaging test that uses a strong magnet and radio waves to make detailed pictures of the inside of the body.
-graphy
A word ending that means the process of recording or making an image.
radiation
Energy that travels as waves or particles, such as X-rays, used to make images or treat cancer; also pain that spreads from its starting point.