A PET/CT scanner is a machine that combines a positron emission tomography (PET) scan and a computed tomography (CT) scan to produce detailed images of the inside of the body. The scans are performed simultaneously, and the combined images are more detailed than either scan alone. 
PET/CT scans are used to:
Diagnose diseases, such as cancer
Plan treatment
Evaluate how well treatment is working 
Here's some more information about PET/CT scans:
How it works
The CT scan takes a series of X-rays to create a 3D image. The PET scan uses a radioactive liquid to show areas of the body where cells are more active than normal. 
Procedure
The scan is usually performed in a radiology department and takes about 30–60 minutes. You lie on a padded table that slides into the scanner, and you must remain still so the images aren't blurred. 
Safety
PET scans are very safe, with a small dose of radiation that's similar to several years' worth of natural radiation. There are no side effects associated with the radioactive tracers, and allergic reactions are very rare. 
PET-CT scan | Tests and scans - Cancer Research UK
A PET-CT scan combines a CT scan and a PET scan. It gives detailed information about your cancer. The CT scan takes a series of x-
Cancer Research UK
Definition of PET-CT scan - NCI Dictionary of Cancer Terms
A procedure that combines the pictures from a positron emission tomography (PET) scan and a computed tomography (CT) scan. The PET...
National Cancer Institute (.gov)
PET scan - NHS inform
7 Nov 2024 — Positron emission tomography (PET) scans are used to produce detailed three-dimensional images of the inside of the body...
NHS inform
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This is for informational purposes only. For medical advice or diagnosis, consult a professional. Generative AI is experimental.