Based on the audio-visual biofeedback(BFB)method for respiratory-gated radiotherapy of synchrotron-based pulsed heavy-ion beam delivery with tracking of external abdominal wall motion[1;2],this study evaluated the feasibility of the respiratory guidance method on thoracic and abdominal cancer patients,and the internal/external respiratory motion consistency under respiratory guidance maneuvers due to its interactive intervention in free breathing(FB).
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