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Abstract #0478

Boosting MR Temporal Resolution Using Rapid Ultrasound Measurements, for Motion-Tracking Purposes

Matthew Toews1, Chang-Sheng Mei1, Renxin Chu1, W. Scott Hoge1, Benjamin M. Schwartz1, Guangyi Wang1, 2, Lawrence P. Panych1, Bruno Madore1

1Department of Radiology, Harvard Medical School, Brigham and Women's Hospital, Boston, MA, United States; 2Department of Radiology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China

A frame rate of twenty frames per second or more is often considered necessary to properly resolve breathing motion for MR-guided therapies. But images with the overall quality, information content and spatial coverage required for effective guidance often cannot be acquired that fast. The present work proposes a system for boosting MR temporal resolution by incorporating ultrasound (US) measurements with high temporal resolution. Experiments showed that predicted MR images could be used to accurately localize anatomical targets in in-vivo liver data, in the presence of breathing motion.