A PET/CT scan is a specialized exam combining PET (Positron Emission Tomography) and CT (Computed Tomography) to assess the metabolic activity of cells and provide anatomic localization, respectively. Patient Instruction Sheet for PET/CT
What will I experience during a 18F FDG PET/CT scan?
- You may be asked to drink oral contrast material.
- Your blood glucose level will be checked.
- You will be injected with a small amount of a radiopharmaceutical, 18FDG (radioactive sugar), after which you will rest in a quiet room for approximately 60 minutes.
- You will be asked to remain still during the exam, which lasts from 30 to 45 minutes.
- You may resume your normal activities after the exam. Drink plenty of fluids to help flush any trace amounts of radioactive material from your body.
- There is no danger to other travelers on public transportation following a PET/CT scan. However, some current radiation detectors in public areas such as airports or international borders can be inadvertently activated by even a small amount of radiation. If appropriate, it may be a good idea to obtain a letter from Great Lakes Medical Imaging stating you have undergone a PET/CT scan in case you are questioned.
- A board-certified radiologist will interpret the results of your exam and share these results with your physician. Your physician will discuss the results with you.
- Notify our staff prior to your exam if you are pregnant, may become pregnant, or are currently breastfeeding.
- Wear comfortable clothing that does not contain metal or zippers. It is suggested that you wear warm (layered) clothing, even in the summer months.
- Abstain from eating or drinking four hours prior to exam, except for water and medications.
- Stay hydrated by drinking six to nine glasses of water the day prior to your exam, and continue to drink water up until your exam.
- Eat a low-carbohydrate, high-protein diet 24 hours prior to your exam. (Diets should consist of less than five grams of carbohydrates per serving)
- Suggested foods
- Non-starchy vegetables (green leafy vegetables like spinach, broccoli, green beans, zucchini)
- Fish, meat, eggs and cheese
- If you are claustrophobic, you can schedule a time with our staff to look at the machine prior to your exam. You may also ask your physician to prescribe a single dose of relaxant for the day of the exam, if necessary. In this case, please arrange for transportation to and from our office.
- Please allow two full hours in your schedule for your exam.
- Do not wear jewelry, piercings or removable dental work.
- Do not eat high-carbohydrate/sugar foods
Food to Avoid:
- Cereals, pastas, breads and grains
- Peas, corn, rice, potatoes and beans
- All fruits, fruit juices and soda pop
- Candy, mints, cough drops and gum
- Alcoholic beverages and caffeinated drinks
- Do not perform strenuous exercise, work, or cleaning 24 hours prior to your exam.
- Do not bring children or pregnant women with you to the exam.
- If you have diabetes, do not eat for two hours prior to the exam and do not take insulin within four hours of your exam. If you have a blood glucose level of greater than 200 mg/dL, your exam may need to be rescheduled. Consult with your physician with questions or concerns.
To schedule a PET/CT scan, please contact us at (716) 836-4646.
If you have additional questions about the test or the radiation involved, please visit www.radiologyinfo.org.