Method for measuring deviation between human and body position fixing device in radiotherapy positioning based on infrared guiding

The invention discloses a method for measuring the deviation between a human and a body position fixing device in radiotherapy positioning based on infrared guiding. Accurate implementation of tumor radiotherapy requires a body position of a patient to be always consistent with that in a therapy plan when radiotherapy is carried out for multiple times. In order to realize the purpose, body position fixing devices such as a negative pressure bag can be generally used for assisting the fixation of the body position of the patient; but in actual operation, due to the factors of movement, body change and the like of the patient, the deviation can easily exist between the body position fixing device and the patient, so that the phenomenon that the body position of the patient is inconsistent with that in the plan is caused, and the accurate implementation of the radiotherapy is affected. Aiming at the defect of the prior art, the invention solves the technical problem to find the method for rapidly feeding back th