Assuming that the anatomy of the treatment area remains constant during the treatment and does not change during the treatment, the treatment plan is usually made once at the beginning and the same plan is used throughout the entire treatment.
However, there may be daily changes in the anatomy determined at the beginning, the shape, and position of the treated target. During the treatment period, the shape and position of the target area; There may be shrinkage or enlargement in the tumor, as well as differences in the filling of organs with anatomical cavities or cavities, movements of organs, changes in the patient's weight during treatment or due to hypoxic changes in the tumor. As a result, the doses planned to be given in the organs to be protected in and around the treated area may change.
ART is the changing of the image-guided radiotherapy plan applied to the patient during the treatment process according to the need, taking into account these changes specified in the field of radiotherapy.