PET (positron emission tomography) and molecular imaging technology allow your physician to measure cell and molecular activity within the body to detect cancer, heart disease and neurological disorders. PET/CT scanners combine the anatomical imaging supplied by CT with the confirmation of increased molecular and cellular activity provided by PET. The PET/CT image provides valuable information that can be used for early diagnosis, more accurate tumor detection and precise localization, improved biopsy sampling and better assessment of patient responses to chemotherapy and radiation therapy.