RADIATION TREATMENT SYSTEM HAVING A FUNCTION OF COMPENSATING DISPLACEMENT ACCORDING TO BREATHING AND METHOD FOR CONTROLLING THE SYSTEM

摘要

A radiotherapy system capable of compensating for displacement according to the breathing of a patient, and a method for controlling the same are disclosed. The method includes the steps of: a) irradiating an affected part of the patient who lies on a moving phantom (100) which compensates for displacement of the irradiated part according to breathing of the patient; b) measuring a distance from the irradiated part of the patient to each of ultrasonic sensors (101) using ultrasound; c) extracting displacement of the irradiated part of the patient on the basis of the measured distance; d) generating displacement-compensation information for compensating for the extracted displacement of the irradiated part; and e) moving the moving phantom on the basis of the displacement-compensation information, and compensating for the displacement of the irradiated part. The radiotherapy system acquires the displacement according to the breathing of a patient using an ultrasonic sensor, and adjusts the location of a moving phantom (i.e., a patient bed) using an inverse value of the acquired displacement, such that it recognizes displacement caused by the natural breathing of the patient, reduces a target volume, and ensures patient safety.