Radiotherapy https://www.mmumullana.org/course/b-sc-medical-technology-radiotherapy-bmtr is a therapy using ionizing radiation. It is generally used as part of cancer treatment. In simple terms, the radiation is used to kill or control the growth of malignant cells in a specific part of the body or organ. The radiation alters the DNA structure of the malignant cells. Thus, it kills or restricts the growth of such harmful cells.