Taeho Kim1, Paul Keall1
1Radiation Physics Laboratory, Unviersity of Sydney, Camperdown, NSW, Australia
The quality of the radiation treatments can be compromised by involuntary respiratory motion, which can reduce image quality and tumor control (4-5% dose variation per 5 mm tumor excursion). Respiratory gating and breath-hold methods for respiratory motion-compensation are practically useful, but respiratory gating increases scan time and breath-hold requires the patients full cooperation during the scan. The aim of this study is to develop a novel respiratory motion control system using audiovisual (AV) biofeedback combined with abdomen MRI and to demonstrate improved abdominal position reproducibility and reduced motion artifacts in breath-hold MRI.