Gamma Knife is a new technology developed by our scientists and technicians on the basis of head rotating γ knife to implement stereotactic radiation therapy for tumors in the body parenchyma organs. It is through multiple radiation sources, rotating focus, like an invisible, non-invasive “knife”, to achieve high dose in the target area and low dose irradiation outside the target area, to destroy the tumor without harming the innocent. Of course, body gamma knife treatment is not suitable for all tumors, such as tumors located in or adjacent to cavernous organs, body gamma knife treatment should be avoided as much as possible. Therefore, body gamma knife is mainly suitable for the treatment of tumors in parenchymal organs such as lung, liver and pancreas, including radical radiotherapy, additional radiotherapy after conventional radiotherapy and recurrent radiotherapy after radiotherapy. For early limited tumors or metastases in lung and liver, γ-knife treatment can achieve radical effect and local control rate of tumors below 5cm in parenchymal organs such as liver and lung can reach over 90%. The efficacy of Gamma Knife depends on the standardization of treatment. What is standardization? Emphasis on five points Select the right patient. It refers to the selection of the best indications for treatment. For example, tumors growing in the stomach and intestinal tract are suitable for surgery because there is enough space for resection; however, patients with nasopharyngeal cancer, lung cancer patients who are old and frail, and liver cancer patients with liver cirrhosis can choose modern radiotherapy because there is no space for surgery or they are not suitable for surgery. Shine on the right field. Figure out which parts are tumors and which are not. Using enhanced CT, MRI and PET-CT technology to determine the location and size of the cancer, PET-CT is one of the best clinical tools used to diagnose and guide the treatment of tumors, and the imaging information provided can help doctors detect tumors over 2 mm, which is a prerequisite for achieving targeted radiotherapy. Accurate location. The tumor will be like a “moving target” when a person is breathing. Therefore, on the one hand, active breathing control is needed, and on the other hand, real-time tumor location tracking is needed for more accurate positioning. Give adequate dose. The new model of target-in-target dose incremental radiotherapy is implemented for tumors, which means that the high dose is highly concentrated in the target area and the dose outside the target area is significantly reduced. Avoid damage. Modern radiotherapy, with the help of imaging technology, positioning technology and other techniques and equipment, is like launching a cruise missile after global satellite positioning, pointing to where to hit, truly achieving targeting and protecting normal tissues. Those patients who cannot be removed surgically do not mean that modern radiotherapy cannot cure them. For example, surgery for cholangiocarcinoma of the hilar region is a forbidden area, but modern radiotherapy can eliminate this tumor with minimal damage. For example, the 5-year survival rate for stage I non-small cell lung cancer has increased from 30% to about 70%, which is the same as that of surgery, and the side effects are minimal. The efficacy of using modern radiotherapy techniques to treat brain tumors, liver cancer, pancreatic cancer, lung metastases, liver metastases and retroperitoneal tumors has been significantly improved. Therefore, for limited tumors of parenchymal organs, not only surgery can be used to cure them, but also modern radiotherapy can be used to cure them with less side effects and trauma.