Total body irradiation (TBI) is a type of radiation therapy that involves exposing the entire body to high-energy radiation. It is commonly used in the treatment of cancer and is often part of the preparation for a bone marrow transplant. It is typically administered in several doses over a period of several days. Sarvodaya Cancer Institute houses the most advanced Versa HD 6D Couch LINAC for radiation therapies, including TBI therapy. The primary goal of TBI therapy is to kill cancer cells or to suppress the immune system for a bone marrow transplant. It is often used in combination with other treatments, such as chemotherapy, to maximize the effectiveness of the therapy.