What is a PET scan?

A PET scan or a PET-CT is a special type of nuclear medicine test that combines the use of a radio nuclide and a CT scanner to obtain images and measure metabolic activity in the tissues being imaged.

Like other nuclear medicine tests, the PET-CT uses a radiotracer to acquire anatomic and physiological information about internal organs. The functional images obtained by the PET scan are then superimposed with anatomic images obtained by a conventional CT scanner. Post processing software is then used to create detailed two- and three-dimensional images for the Radiologist to review.

PET-CT has become instrumental in evaluating many types of cancers and neurological diseases such as Alzheimer’s disease.

How should I prepare for a PET scan?

Your provider will give you detailed instructions on how to prepare for your scan. A general rule is:

• Do not eat anything for 4 to 6 hours before the exam
• Avoid strenuous exercise for a couple of days before the study
• Wear comfortable clothing
• Be prepared to stay for 2-3 hours

If you have any of the conditions listed below, please let us know so we can make arrangements for you before your appointment.

• Have medical condition, such as diabetes
• Taking any medicines, vitamins or herbal supplements
• Pregnancy
• Breastfeeding
• Claustrophobia

What should I expect during a PET scan?

The PET/CT scanner is a large machine that looks similar to a CT scanner. From start to finish, the procedure takes about two hours to complete. You will receive the IV injection of the isotope about an hour prior to your imaging. You rest and remain silent in a reclining chair for 30 to 60 minutes while the radioactive substance takes effect. When you are ready, you lie on a narrow, padded table that slides into the scanner. It is very important to lie as still as possible during your exam as motion artifacts can have a negative effect on the image’s diagnostic quality. It takes about 30-45 minutes to complete a PET/CT scan. You won’t feel anything, so please relax comfortably while the table moves throughout your exam.

After the test you can carry on with your day as usual unless your provider tells you otherwise. You’ll need to drink plenty of fluids to help flush the tracer from your body.

What happens after a PET scan?

Your images will be interpreted by a Radiologist who will send a report to your provider. Your provider will discuss these results with you.