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Abstract #0463

Scout Acquisition enables rapid Motion Estimation (SAME) for retrospective motion mitigation.

Daniel Polak1,2,3, Stephen Cauley2,4,5, Berkin Bilgic2,4,5, Daniel Nicolas Splitthoff3, Peter Bachert1, Lawrence L. Wald2,4,5, and Kawin Setsompop2,4,5
1Department of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, 2Department of Radiology, A. A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 3Siemens Healthcare GmbH, Erlangen, Germany, 4Department of Radiology, Harvard Medical School, Boston, MA, United States, 5Harvard-MIT Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States

Navigation-free retrospective motion-correction typically requires estimating hundreds of coupled temporal motion parameters by solving a large non-linear inverse problem. This can be extremely demanding computationally, which has impeded implementation/adoption in clinical settings. We propose a technique that utilizes a single rapid scout scan (Tadd=3sec) to drastically reduce the computation cost of this motion-estimation and create a pathway for clinical acceptance. We optimized this scout along with the sequence acquisition reordering in a 3D Turbo-Spin-Echo acquisition. Our approach was evaluated in-vivo with up to R=6-fold acceleration and robust motion-mitigation was achieved using a scout with differing contrast to the imaging sequence.

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