PET/CT

Positron emission tomography/computed tomography (PET/CT) is special imaging technology. It uses nuclear medicine and computerized x-rays to give your care team the most accurate and precise image possible.

The PET scanner shows how cells are functioning (metabolism), while the CT scanner shows detailed anatomy and location.

Doctors use PET/CT scans to diagnose heart disease and brain disorders, but they’re most often used to diagnose cancer. They let your care team:

• Detect cancer and learn its stage
• Find the right place for a biopsy
• See how well cancer treatments are working
• Plan radiation therapy

How does a PET/CT scan work?

Like other nuclear medicine scans, PET/CT scans use very small amounts of radioactive material (called radiotracers) to see inside the body. A technologist or nurse will insert an IV to administer the radiotracers. You may then need to rest for 30 to 90 minutes to allow the radiotracers time to reach the tissues that will be scanned.

The PET/CT scanner looks like a large donut with a flat table in the middle. You’ll lie down on the scanner table, which may have pillows, straps or a cradle for your head. Your position on the table will depend on what part of your body is being scanned. Most patients lie on their backs.

All you need to do is relax and lie quietly. When the scan starts, the table will slide quickly through the hole in the center to make sure you’re in the right position. The table will slide slowly back and forth. The technologist may also raise or lower the table or tilt the scanner to get pictures from different angles.

After the procedure, the tech will answer any questions you may have. A radiologist will review your images and share them with your doctor in a few hours.