Therapeutic radiology is a branch of medicine that involves the use of high-energy radiation to treat cancer and other diseases. This field is also known by several other names such as radiation oncology, radiotherapy, and radiation therapy. Radiation has a therapeutic effect on cancer cells, which helps to destroy them or prevent them from spreading. Other synonyms that are commonly used to describe therapeutic radiology include ionizing radiation therapy, external beam therapy, and brachytherapy. These terms all refer to different forms of radiation therapy, which are used to treat a wide range of conditions and diseases. Regardless of the term used, therapeutic radiology is a critical field in helping patients to overcome cancer and other medical conditions.