PET / CT of Las Colinas PET CT Imaging Center Las Colinas employs PET / Positron Emission Tomography. PET is a powerful imaging technique that holds great promise in the diagnosis and treatment of many diseases, particularly cancer. A non-invasive test, PET scans accurately image the body’s physiologic changes. A CT / Computed Tomography scan shows the structure of the anatomy where the changes are taking place. During a single outpatient exam, combining these two scans in one highly sophisticated PET/CT imaging technique provides detailed information to physicians about the presence or spread of disease and accurately identifies its precise location.