PET/CT Basics
 What is PET/CT?
In one continuous full-body scan (usually about 30 minutes), PET captures images of miniscule changes in the body's metabolism caused by the growth of abnormal cells, while CT images simultaneously allow physicians to pinpoint the exact location, size, and shape of the diseased tissue or tumor.
Positron Emission Tomography (PET) and Computerized Tomography (CT) are both standard imaging tools that allow physicians to determine the possibility of cancer within the body before making treatment recommendations.
Alone, each imaging test has particular benefits and limitations, but when the results of PET and CT scans are "fused" together, the combined image provides complete information on cancer location and metabolism.
Benefits PET/CT?
There are tremendous benefits of having a combined PET/CT scan:
- Earlier diagnosis
- Accurate staging and localization
- Precise treatment and monitoring
- Assess effectiveness of chemotherapy
What to expect
When you arrive, the technologist will ask some questions about your health history, explain the test, and check your blood sugar. You will receive an injection in your arm or hand. The injection will contain a tracer amount of radioactive material. The tracer is safe, and no adverse reactions have been documented. After the injection you will sit in a private room for approximately 1 hour while the tracer circulates. In most cases, you may relax, watch TV, or read. After the waiting period you will be asked to empty your bladder and proceed to the scan room. The scanner is similar to a CT scanner. You will lie on your back for 30-40 minutes and slowly move through the scanner as your body is imaged. Movement can impair images, so it is important that you are as comfortable as possible. In most cases, you may wear normal clothing for the entire procedure, although metal objects must be removed. The scan itself takes about 20-30 minutes. You should plan on being here for approximately 1 1/2 - 2 hours.
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