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A PET scan can be used to look at your whole body or just one area.

A PET scan can be used to look at your whole body or just one area.
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PET scan

A PET (positive emission tomography) scan is an imaging test used to diagnose certain diseases. Doctors use it to find tumours, diagnose heart disease, brain disorders and other conditions. PET scans can be used to look at your whole body, or just one area.

How do PET scans work?

If you have a PET scan, you’ll be given a substance that allows doctors to see if there’s anything abnormal with your tissues or organs. This substance is known as a tracer, and is radioactive.

The tracer may be injected, inhaled or swallowed, depending on what part of your body is being scanned.

After you’re given the tracer, you’ll be asked to lie very still in the PET scanner, which looks like a huge donut.

The scanner picks up energy, in the form of gamma rays, from the tracer and converts the rays into pictures.

The pictures show where the substance has moved in your body, which helps doctors understand how your tissues and organs are working.

A specialist examines the scans and gives a report to your doctor, who will explain the results to you.

A PET scan is sometimes used with other scans, such as a CT (computed tomography) scan, to get a more accurate view of your condition.

What should I know?

The scan takes about 30 minutes but you can expect to be in the PET imaging department for between two and three hours.

Before the scan, you should:

  • You should let the person scanning you know if you’re breastfeeding, or if you are (or might be) pregnant.
  • You should also tell them if you are likely to feel anxious about being in a closed space.
  • You should ask about any food and drink restrictions before your scan.

Last reviewed: June 2015

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