The success of radiotherapy depends on the correct application of application. The treatment process, which starts with the determination of the correct target, is completed with the administration of sufficient dose in order to destroy the tumor and without unnecessary damage to the surrounding healthy tissues. body movements will occur in this process, and affects the respiratory movement of the treatment process. The definition of 4D radiotherapy is the application of appropriate treatment using repeated scans during the treatment process. For this purpose, respiration is continuously monitored with time position tracking sensors added to linear accelerators, ensuring that the treatment is appropriate throughout the treatment.