Tumor radiotherapy

Radiation therapy, referred to as radiotherapy, the South commonly known as "light", the North commonly known as "roasted", is the application of radiation treatment of disease. The radiation used in radiotherapy may be derived from gamma-rays or beta-rays from radioisotopes, or X-rays from X-ray machines, but the most commonly used X-rays produced by accelerators are currently Including electron beams, protons, fast neutrons, negative mesons, and other heavy particles (carbon ions, etc.) produced by various accelerators. Clinically, radiotherapy is mainly used for the treatment of malignant tumors, therefore, also known as radiation oncology, but in addition to malignant tumors, radiation therapy can also be used for about 100 kinds of benign disease treatment.
 
Radiation therapy and surgery, chemotherapy and known as the traditional three major treatment of tumor, about 65% to 75% of malignant tumors in different stages of the need for radiation therapy; radiation therapy can be used for early and local advanced malignant tumor radical Sexual therapy, can also be used in patients with surgical treatment of adjuvant or neoadjuvant therapy, as well as advanced cancer patients palliative care.
 
Radiation therapy has a history of more than a century, in the treatment of malignant tumors play an important role, but radiation therapy is also a means of injury treatment, while killing tumor cells, but also on the normal tissue around the tumor have a certain damage , So the dose of radiation therapy is often limited by the normal tissue around the tumor; In addition, radiation therapy is a local area of treatment, has been distant metastasis of advanced tumors, radiation therapy is often only palliative effect.
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Today, with the development of clinical oncology, radiophysics and radiobiology, radiotherapy has been developed in the direction of precise positioning, precise planning, and precise treatment of "three refinements" with the aim of maximizing tumor dose Radiation on the normal tissue around the tumor damage.