Positron Emission Tomography – Computed Tomography (PETCT) scan is done by injecting radioactive drugs which accumulates in specific sites. This reveals the biochemical or metabolical function of the tissues and this information is used for diagnosis.
In cancer patients, 18-Fluro-Deoxy-Glucose, a radioactive glucose in injected into the patient which accumulates in cancer tissues which ‘light-up’ in the scan. This information helps in diagnosing and staging the cancer and for assessing the treatment response.
It is also used in non-cancerous diseases.
Brain – to check certain brain disorders, such as tumors, Alzheimer’s disease and seizures.
Heart – To analyze the functional capacity of the heart
Infections – To find the source of infection in cases of sepsis.