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Abstract #3978

Diaphragm Motion Control in Fast MRI Using Audiovisual Biofeedback

Taeho Kim1, Michael Graf2, Elaine Ryan, Paul Keall1

1Radiation Physics Laboratory, Unviersity of Sydney, Camperdown, NSW, Australia; 2GE Healthcare

40% of lung cancer patients receive radiotherapy as part of their treatment. Involuntary respiratory motion can compromise treatment quality by decreasing image quality and lowering tumor control (4-5% dose variation per 5 mm tumor excursion). The aim of this study is to develop a novel respiratory motion control system using audiovisual (AV) biofeedback combined with chest MRI to improve diaphragm motion reproducibility, increasing respiratory gating efficiency and reducing motion artifacts in MRI.