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What is combined PET/CT scanning?
Combined PET/CT scanning joins two imaging tests, CT and positron emission tomography (PET), into one procedure. A PET scan creates colored pictures of chemical changes (metabolic activity) in tissues. Because cancerous tumors usually are more active than normal tissue, they appear different on a PET scan.

Combining CT with PET scanning may provide a more complete picture of a tumor�s location and growth or spread than either test alone. Researchers hope that the combined procedure will improve health care professionals� ability to diagnose cancer, determine how far it has spread, and follow patients� responses to treatment. The combined PET/CT scan may also reduce the number of additional imaging tests and other procedures a patient needs. However, this new technology is currently available only at some facilities.
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Hi Cheryl

I hate to be the one to throw a spanner into the works but your National Cancer Institute has the above to say in response to your question. The link to the site is below

http://www.cancer.gov/cancertopics/factsheet/Detection/CT