PET-CT

A PET-CT (Positron Emission Tomography-Computed Tomography) scan is a medical imaging technique that combines two powerful imaging technologies: PET and CT. This hybrid imaging approach provides valuable information about the structure and function of various organs and tissues in the body.

PET-CT scans are a valuable tool in modern medicine and have greatly improved the ability to diagnose and manage various diseases, particularly cancer. They offer a more holistic view of a patient's condition and aid in making more informed medical decisions.

Why a PET-CT scan is done

  • Finding out the stage of a cancer and whether it has spread
  • Checking how well cancer treatment is working
  • Looking for cancer that may have come back
  • Planning radiotherapy
  • Selected heart and brain conditions, and some infections or inflammation

How to prepare

  • Usually no food for about six hours before the scan; plain water is allowed and encouraged
  • Avoid strenuous exercise for a day before the scan
  • People with diabetes should ask for specific instructions about food and medicines, as high blood sugar can affect the scan
  • Bring previous scans, reports and your doctor's request
  • Tell the team if you are pregnant, may be pregnant or are breastfeeding

What happens on the day

  1. Your blood sugar is checked.
  2. A small amount of a radioactive tracer, most commonly FDG (a form of glucose), is injected into a vein.
  3. You rest quietly for about an hour while the tracer spreads through the body.
  4. You lie on the scanner table for about 20 to 30 minutes while images are taken.

Plan for the visit to take two to three hours in total.

Is it safe?

The radiation dose is small and the tracer leaves the body within hours. Drinking plenty of water after the scan helps. As a precaution, avoid close contact with pregnant women and small children for a few hours afterwards. The report is prepared by a specialist and sent to your treating doctor.

For help, call 0522-666-4444. Charak Hospital & Research Centre, Hardoi Road, Dubagga, Lucknow.

Frequently asked questions

Is a PET-CT the same as a CT scan?

No. A CT scan shows structure, while PET-CT also shows how active tissues are, which helps detect disease that may not be visible on CT alone.

Will I feel anything?

Only the small needle prick for the injection. The scan itself is painless.

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