Beginning with the discovery of X-rays by Wilhelm Conrad Röntgen in 1895 and the subsequent application of X-rays for cancer treatment in 1896, the narrative unfolds through the advancements in radiation therapy modalities.

The discussion covers External Beam Radiotherapy (EBRT), including various techniques like 3D-CRT, IMRT, IGRT, stereotactic radiotherapy, and proton therapy. Emerging technologies such as Tomotherapy, Stereotactic Radiosurgery (SRS), Boron Neutron Capture Therapy (BNCT), Carbon Ion Therapy, and Brachytherapy are explored, offering tailored approaches for different cancer types.

The article delves into the history and advancements of brachytherapy, highlighting its techniques like intracavitary, interstitial, and HDR surface mould brachytherapy. The continuous pursuit of precision, efficacy, and reduced side effects in cancer treatment is evident throughout the narrative.

The article emphasizes the crucial role of radiation therapy, employing various ionizing radiation types, in targeting and eradicating cancer cells while minimizing harm to normal cells. The ongoing quest for advancements in technology and techniques reflects the commitment to improving cancer treatment outcomes. This article provides a comprehensive overview of radiation therapy's historical evolution and current state in cancer treatment

Keywords: Radiotherapy, EBRT, Brachytherapy, IMRT, SRS, IGRT, Proton therapy.

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Hrishikesh Kashyap

Department of Radiation Oncology, All India Institute of Medical Sciences Guwahati, Changsari, Assam-781101, India