CT simulation is a vital tool in teletherapy used in cancer treatment, especially at specialized hospitals like NICRH (National Institute of Cancer Research & Hospital). It is a process where a CT scan is used to create a detailed 3D image of the patient's tumor and surrounding tissues. This simulation allows radiation oncologists to accurately map the area requiring treatment and plan the precise delivery of radiation. The detailed imaging ensures that the radiation is directed exactly to the tumor while minimizing exposure to healthy tissues. At NICRH, this advanced technology helps in delivering personalized and effective treatment plans for cancer patients, contributing to improved outcomes and fewer side effects.