According to the visual and audio feedback, the patient tries to screen into the green box every time; The therapist can also observe the patient's breath holding condition in real time, give voice instructions at the appropriate time (generally, each breath holding needs to last for about 25 seconds), and guide the patient to carry out efficient breathing cooperation until the end of treatment
The success of breath holding directly affects the precise positioning of radiotherapy target area. Doctors can judge whether the breath holding repeatability of patients is consistent. The most accurate method is to compare the consistency of real-time acquisition image and positioning CT image through the position verification film taken before treatment. With visual feedback, patients can see their breathing state and intuitively understand their breath holding completion, which is more conducive to improving the consistency of breath holding

