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Over the years, the management of lymphomatous disease has followed a general trend from the purely empirical and intuitive use of medications to radiation, to surgery, and to chemotherapy with alkylating agents and anti-metabolites. In the 20th century, the treatment of these diseases has been predominantly by radiation. As radiology emerged from Roentgen’s original work to the sophisticated science of the present, the radiological equipment, which had been crude and inaccurate, evolved into mechanical and electronic instruments of enormous complexity and capable of great accuracy. The progress and success of radiation therapy for malignant disease paralleled the technical development of the devices employed. For this reason, the chronology of the parallel development is given in detail.