Nuclear Medicine >>

Nuclear Medicine includes a variety of imaging techniques that show the function of internal organs. Very low-level radioactive isotopes are injected into the patient, who is then examined by a rotating camera that can detect that radiation. The injected material is completely gone from the body within 24 hours.

The PET (Positron Emission Tomography)/CT Scan

Please arrive 30 minutes prior to your scheduled appointment time. To re-schedule your appointment, please call (603) 577-2665.

What is a PET/CT scan?

A PET scan is a safe and effective way to measure tissue or organ function in your body. It is used to diagnose diseases and to monitor the progress of your treatment.

Why is this test needed?

PET scans are used to detect cancer and to examine the effects of cancer therapy. PET is also used to evaluate memory disorders and proven tumor or seizure disorders.

What are the risks?

A PET/CT study requires an injection of a high energy radioactive agent called FDG. Since the radioactivity is very short-lived, the radiation exposure is low.  If you are pregnant or nursing an infant – please advise your physician who will evaluate the risks to your unborn baby or infant.

How do I prepare?

• You should have nothing to eat for 6 hours prior to the exam. 
• Refrain from eating bread, pasta, rice, and chips the evening before your exam.
• Please do not chew gum 24 hours prior to your exam.
• You may take your prescribed medications with a little water.
• Avoid excessive talking and strenuous exercise the day before your exam.
• Wear warm, loose clothing on the day of your exam.

If you are diabetic:

• You should have nothing to eat or drink (including additional insulin) for 6 hours prior to your scan.
• A technologist will call you to discuss dietary restrictions.
• If your glucose level exceeds 200 the morning of your exam – please call the Nuclear Medicine Department at (603) 577-2815. Your scan may need to be rescheduled.

What can I expect during the test?

A technologist will first perform a blood sugar (glucose) test which requires a pin prick in your finger. If your glucose level exceeds 200, the test will need to be rescheduled.

You will be injected with a radioactive substanc (fluoredeoxyglucose or FDG) and asked to lie quietly for 45 minutes in a darkened room. The injection is not painful and there are no side effects.

A series of images will then be taken, lasting 30-60 minutes. The PET scanner is a ring shaped device, similar to a CT scanner. If you have any problem with claustrophobia, please inform your physician prior to the testing day.

After the test, you should drink plenty of fluids to flush the small amount of radioactive substance from your body.

How do I find out the results?

A final report will be sent to your health care provider who will discuss the results with you. Please note that the radiologist who interprets your study will submit a separate bill to your insurer.

Learn more about nuclear medicine tests at WebMd.