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Abstract #4598

A Real-Time Motion Compensation Package and Active Marker Headband for Brain MRI

Melvyn Boon King Ooi1, Sascha Krueger2, William J. Thomas3, Srirama V. Swaminathan4, Truman R. Brown1,3

1Biomedical Engineering, Columbia University, New York, USA; 2Philips Research Europe, Hamburg, Germany; 3Radiology, Columbia University, New York, USA; 4Philips Medical Systems, Cleveland, OH, USA

A prospective, intra-image compensation strategy for rigid-body motion is presented. A short tracking-sequence, interleaved into the imaging-sequence, measures the positions of three active-markers integrated into a headband worn by the subject. During head motion, the rigid-body transformation that realigns these markers is fed back to update the image-plane maintaining it at a fixed orientation relative to the head before the next segment of k-space is acquired. The complete package requires minimal additional hardware and can be flexibly incorporated into multiple imaging-sequences, promoting transferability to clinical practice. Improvements in image quality are evaluated in 3D-MPRAGE brain MRI during volunteer motion.