positron emission tomography, or PET, scan is a diagnostic imaging technique that helps reveal how tissues and organs are functioning. PET scans are useful in detecting or evaluating certain conditions, such as cancer, heart disease, and brain disorders. PET images are often combined with CT or MRI scans to create special views.

Positron emission tomography is a new, modern imaging diagnostic tool that is very valuable in diagnosing and evaluating cancer and some other body functions.