PET CT scan is combination of Positron Emission Tomography (PET) and Computed Tomography (CT) imaging. In this scan the functional or metabolic information from PET scan is combined with anatomical information from CT scan for better understanding of disease process.
In PET scan we use small amount of radioactive material which is administered into the body through intravenous cannula. PET scan helps to understand early biochemical changes in the body. CT scan uses special x-ray equipment and in some cases a contrast material to produce multiple images of the inside of the body. This helps in understanding anatomy of internal organs. Fusion of PET and CT allows best of functional and anatomical images to be available for analysis, increasing diagnostic capabilities.