When we need radiotherapy, doctors often introduce different radiotherapy modalities for patients to choose, the most commonly mentioned is “precision radiotherapy” and “general radiotherapy”, so what is the difference between them? The difference between “general radiotherapy” and “precision radiotherapy” is the difference in the way of positioning, which is commonly known as the difference in the method used to determine the location of the tumor and the area to be irradiated. ”General radiotherapy” is the positioning of the tumor under the analog positioning machine. It is actually a special kind of X-ray machine, but its working principle and imaging capability are not very different from the machine we use for chest fluoroscopy. It is a “common” positioning method that has been used for decades and is “old”. ”Precision radiotherapy” is a new form of radiotherapy that combines radiotherapy treatment with computer technology. This treatment emphasizes the precise location of the tumor and the area to be irradiated. Therefore, it uses more advanced positioning methods, usually with a CT machine, which is capable of obtaining three-dimensional and clearer images. These images are fed into a computer, which helps to design the radiation treatment plan. The two main types of “precision radiotherapy” are “conformal radiotherapy” and “intensity modulated radiotherapy”.