Nuclear medicine is a medical specialty involving the application of radioactive substances in the diagnosis and treatment of disease​. Nuclear medicine, in a sense, is "radiology done inside out" or "endoradiology" ​because it records radiation emitting from within the body rather than radiation that is generated by external sources like X-rays. In addition, nuclear medicine scans differ from radiology as the emphasis is not on imaging anatomy but the function and for such reason, it is called a physiological imaging modality.