In 1999, the World Health Organization (WHO) announced that about 45% of malignant tumors can be cured, including 22% by surgery, 18% by radiotherapy and 5% by chemotherapy. Currently, tumor treatments include surgery, radiotherapy, chemotherapy, targeted therapy, biological therapy (usually including immunotherapy, cell therapy, gene therapy, etc.), Chinese herbal medicine, interventional therapy, thermal therapy (ultrasound focusing, radiofrequency ablation), and so on. Usually, surgery, radiotherapy and chemotherapy are listed as the “trident” of tumor treatment and are the main means of tumor treatment. For many cancer patients, radiotherapy is the only and necessary treatment method.