Talk to us about: becoming a patient
At Icon, our PET/CT service supports the diagnosis, treatment planning, and monitoring of a wide range of cancers. Positron Emission Tomography–Computed Tomography (PET/CT) is an advanced imaging test that combines two scans in one:
Together, these scans deliver a highly detailed picture that helps doctors detect cancer, stage the disease, guide treatment, and monitor response to therapy.
A small amount of a radioactive tracer is injected into your bloodstream. The type of tracer used depends on your condition:
The PET scan detects areas of abnormal cellular activity, while the CT scan pinpoints their exact location, giving your doctors a highly detailed view to guide care.
Your preparation instructions will vary depending on the type of scan and tracer used.
For PSMA and most non-FDG oncology scans:
For FDG PET/CT scans:
On the day of your scan:
What to tell us before your scan
Please let us know if you:
The scan itself takes 15–40 minutes, and your full appointment may last about two and a half hours.
At Icon, we combine advanced PET/CT technology with the expertise of radiologist oncologists who focus on cancer imaging. When required, our teams also perform neurological PET/CT scans, such as those used in the assessment of Alzheimer’s disease.
We’re here to:
In some cases, PET/CT is also used for other conditions, including certain neurological diseases such as Alzheimer’s, when clinically appropriate.
Unlike CT or MRI scans, which mainly show structural changes, PET/CT shows both structure and function. This means it can detect cellular changes early, sometimes before anatomical changes become visible on other imaging tests.
PET/CT uses only a small amount of radiation, comparable to other imaging tests. The radioactive tracer is quickly broken down and leaves your body naturally, usually within 24 hours. The scan is considered safe, and the diagnostic benefits greatly outweigh any potential risks.
The tracer is a small amount of radioactive material that helps highlight areas of abnormal activity in your body. The PET scanner detects this activity, allowing doctors to see how your tissues and organs are functioning.
Most commonly, the tracer is administered through a small injection into a vein. However, for certain types of scans, the tracer may instead be given as a tablet to swallow or as a gas to inhale. The method used depends on the type of tracer and the condition being investigated.
Regardless of how it is given, the tracer is safe, uses only a tiny amount of radioactivity, and naturally leaves your body within about 24 hours.
Preparation depends on the type of tracer used. For PSMA scans, you can eat and drink as usual. For FDG scans, you may need to follow a low-carbohydrate diet and fast for several hours before your appointment. Our team will provide specific instructions when you book.
No, the scan itself is painless. The only minor discomfort is the insertion of the IV cannula for the tracer injection. If CT contrast is also used, you might feel a warm flush or metallic taste for a few seconds – this is normal.
Side effects are extremely rare. The tracer leaves your body naturally, and you can resume your normal activities after the scan. If you are breastfeeding, you will be asked to express and bottle-feed for a short time to minimise radiation exposure to your baby.
Your images will be reviewed by our specialist radiologists, who prepare a detailed report for your referring doctor. Your doctor will discuss the results with you at your follow-up appointment.
For safety reasons, children cannot enter the scan room, and there is no supervision available in the waiting area. Please arrange childcare or bring another adult to assist if needed.
Your PET/CT will be performed by a qualified technologist, with images reviewed by subspecialist radiologists who focus on oncology imaging. Our team is here to ensure you feel informed, comfortable, and supported throughout your appointment.
Find out how to become a patient at Icon Cancer Centre, or request more information from your nearest centre.
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