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Abstract #1587

Audiovisual Biofeedback Improves Image Quality and Reduces Scan Time for Gated 3D MRI

Danny Lee1, Peter Greer2, Jameen Arm3, Paul Keall1, Taeho Kim1

1Radiation Physics Laboratory, Sydney Medical School, The University of Sydney, Camperdown, NSW, Australia; 2The University of Newcastle, Newcastle, NSW, Australia; 3Calvary Mater Newcastle Hospital, Newcastle, NSW, Australia

Audiovisual (AV) biofeedback system has been employed to provide respiratory guidance during MR scans. The respiratory motion signals were obtained using real-time position management system to monitor a marker block on the abdomen. Respiratory-related motion artifacts have been noticeably reduced between breathing types (free and AV biofeedback) and scan time has been reduced for gated 3D MRI. Consequently, the improvement was from respiratory motion reproducibility, leading to regular internal organ displacement during gated 3D MR imaging. This study was the first to demonstrate that audiovisual biofeedback improves image quality and reduces scan time for gated 3D MRI.