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PET Scans

If your doctor has prescribed a PET scan, let the team at Banner Health assist with your tests and treatments. Learn more about PET scans from the experts.  

What is a PET Scan?

A positron emission tomography (PET) scan is a type of nuclear medicine imaging test used to assess healthy versus unhealthy tissues in the body. A PET scan is performed using a PET scanner, which detects radioactive tracers that are injected, swallowed or inhaled by the patient. 

PET scan vs CT scan vs MRI scan

PET scans are often combined with a computed tomography (CT) scan or an MRI scan to form PET-MRI or PET-CT scans. A CT scan uses X-rays to create detailed images of the body, while an MRI scan uses magnetic fields and radio waves to generate images of organs and tissues.  

When is a PET Scan used?

Your doctor may prescribe a PET scan to assess how your body is functioning, including blood flow and oxygen utilization. PET scans are useful for diagnosing cancer, heart disease and brain disorders, as well as monitoring treatment effectiveness. The scan provides detailed images that help doctors evaluate whether a disease is progressing or a treatment is working.

How to prepare for a PET scan

Proper preparation can help ensure accurate PET scan results. Here are some important steps to follow:

  • Diet and fasting: Stop eating at least six hours before your PET scan. Only drink water during this fasting period. Avoid foods or drinks containing caffeine or sugar, as they can affect the scan results, particularly your blood sugar levels.
  • Medication: Continue taking prescribed medications unless your doctor advises otherwise. Inform your doctor of all medications and supplements you are taking, as some may need to be paused before the scan.
  • Clothing: Wear comfortable, loose-fitting clothing. Avoid jewelry or accessories with metal, as they can interfere with the scan.
  • Allergies and medical conditions: Inform your doctor if you have any allergies, particularly to iodine, as some PET scans may use a contrast dye. Also, let your doctor know if you have any medical conditions such as diabetes or kidney disease, or if you are pregnant or breastfeeding.
  • Hydration: Stay well-hydrated by drinking water before your scan. This helps your body eliminate the radioactive tracers more quickly after the scan.
  • Previous imaging tests: If you have had previous imaging tests, such as a CT scan, MRI scan or another PET scan, bring those records with you. This can help the radiologist compare results for a more accurate diagnosis.
  • Claustrophobia: If you have a fear of enclosed spaces, inform your doctor. They may provide a mild sedative to help you relax during the scan.

Following these preparation steps can help ensure a smooth and accurate PET scan experience. If you have any questions or concerns, Banner Health is here to assist you. 

What to expect from a PET scan

PET scans may be performed at a Banner Health hospital, clinic or one of our Banner Imaging locations.

First, the radioactive tracers will be swallowed, inhaled or injected. These tracers allow the gamma camera to detect gamma rays from the tracers, meaning the PET scan machine itself does not produce radiation. The scan takes place in a scanner, where you must lie still without movement. The test is painless, and the tracers should leave your body within 60 hours. Once the test is complete, your doctor will review the results to compare healthy tissues and organs with unhealthy ones. 

How long does a PET scan take?

A PET scan typically takes about 30 minutes to two hours, depending on the type of imaging test being performed.

PET scan risks

Since the radioactive tracer is a small amount, there are no known significant risks associated with a PET scan. However, inform your doctor if you have allergies, are pregnant or are breastfeeding.

Where can I get a PET scan?

You can get a PET Scan at many of our conveniently located Banner Imaging facilities.

Trust the professionals at Banner Health to assist with your PET scan testing and treatment options.

Find an Imaging Location Near You

Whatever your need, your doctor can refer you to one of our conveniently located free-standing imaging centers or one of our hospitals.