Method and apparatus for adaptive radiation therapy based on plan library invoking

An apparatus for Adaptive Radiation Therapy (ART), comprising:

• a first acquisition unit, configured to acquire a medical image of the day and a target plan library of a target patient, wherein the target plan library comprises a plurality of groups of images of the target patient and a radiation therapy plan corresponding to each set of images;
• and
• a determination unit, configured to determine the radiation therapy plan corresponding to the target patient according to the medical image of the day and the target plan library;
• wherein the acquisition unit includes a determination module, a registration module, and an updating module;
• the determination module, configured to determine whether there is an offline plan library corresponding to the target patient;
• the offline plan library includes a plurality of groups of images of the target patient and a radiation therapy plan corresponding to each set of images;
• the registration module, configured to, when there is the offline plan library corresponding to the target patient, perform image registration on the medical image of the day and the plurality of groups of images in the offline plan library to obtain a deformation field;
• the updating module, configured to, when a deformation quantity of the deformation field is less than a preset threshold I, use the offline plan library as the target plan library, or update the radiation therapy plan of the offline plan library according to the deformation quantity to obtain the target plan library.