Abdominal Motion Control in Breath-Hold MRI Using Audiovisual Biofeedback

Taeho Kim¹, Paul Keall¹

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.