PET/CT is one of the most effective imaging techniques available today. It is particularly effective in diagnosing tumors in oncology, determining the degree to which a tumor has spread, planning radiotherapy, assessing the response to treatment and sometimes, it can determine if a mass is benign or malignant. PET/CT is the result of the combination of PET (Positron Emission Tomography) which displays the metabolic function of the organs and tissue in the human body, and CT (Computerized Tomography) which produces detailed, anatomical information. The PET/CT device is instrumental not only in oncology, but also in determining epilepsy, neurological diseases including Alzheimer’s and to pinpoint healthy tissue in the heart following a heart attack.