This investigation combines CT scanning with positron emission tomography (PET). The PET scan uses low dose radiation to highlight cells in the body that are more active than normal. More active cells can identify the presence of cancer. A PET-CT may be carried out in place of a CT scan, or when further information is required to plan treatment.
For six hours before the test you will be unable to eat anything but will be able to drink water. When you arrive for the scan you will be given an injection of a low dose of radioactive substance and about an hour later have the scan. The scan itself will take 30-90 minutes.
For more information about having a PET-CT scan click here.