Respiratory gating system

A respiratory gating system for inducing respiration of a patient during radiation therapy, the respiratory gating system comprising:

• an image management unit configured to acquire a magnetic resonance imaging (MRI) image of the patient and process the acquired MRI image;
• a projection unit configured to display the MRI image acquired and processed in the image management unit to the patient in real time;
• and
• a radiation irradiation unit configured to irradiate the patient with radiation according to a radiation therapy plan,
• wherein the projection unit is configured to project an image of a treatment region of the patient in real time together with a predefined boundary according to the radiation therapy plan using a bore of a radiation therapy apparatus, which is formed to surround the patient to acquire the MRI image, as a screen.