1.What is radiation therapy? Radiation therapy is the application of radiation energy to kill tumor cells to achieve the purpose of radical or palliative treatment of tumor, or radiotherapy for short (commonly known as light, baking electricity, etc.). After more than a hundred years of exploration and research by numerous physicists and medical doctors, radiation therapy has developed significantly, forming radiation therapy integrating oncology, radiation physics, radiation biology and radiation protection, and becoming one of the three major treasures in the treatment of tumors, and about 80% of tumor patients need radiation therapy. Radiotherapy has cured a large number of tumor patients and made great contribution to human tumor prevention and treatment. 2.What is the latest radiotherapy technology? The latest radiotherapy technology is called precise radiotherapy, including conformal radiotherapy and intensity-modulated radiotherapy, whose highest goal is precise technology, accurate site, high dose in the target area and low response to radiotherapy. We apply CT positioning, high-energy linear gas pedal, multileaf grating, fixation device, computer planning system, network and other high precision instruments and equipment to select different types of radiation and irradiation dose according to the patient’s specific situation, and use radiotherapy treatment planning system to make radiotherapy plan, such as the angle and direction of radiation projection, to ensure that the irradiated target area can be included within 90% of the equivalent dose line, and at the same time, try to make important tissues and organs The treatment plan is based on the tumor regression. During the treatment process, the treatment plan will be continuously improved according to the tumor regression. Therefore, the treatment must be carried out under the guidance of a professional radiotherapist with rich clinical experience. 3.What conditions are suitable for radiotherapy? Radiotherapy is preferred for nasopharyngeal cancer, laryngeal cancer, tonsil cancer, prostate cancer and upper segment esophageal cancer. Breast cancer, lung cancer, esophageal cancer, hepatobiliary cancer, pancreatic cancer, rectal cancer, bladder cancer, brain tumor, etc. need radiotherapy after surgery. Radiotherapy is the first choice for early and mid-stage tumors that cannot tolerate surgery or refuse surgery. Palliative radiotherapy for advanced tumors and brain, lung, liver, bone and lymph node metastases can significantly improve the quality of life.