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Abstract #2556

Retrospective rigid motion correction of undersampled MRI data

Alexander Loktyushin 1 , Maryna Babayeva 2,3 , Daniel Gallichan 4 , Gunnar Krueger 2,3 , Klaus Scheffler 5,6 , and Tobias Kober 2,3

1 Empirical Inference, Max Planck Institute for Intelligent Systems, Tbingen, Germany, 2 Siemens ACIT - CHUV Radiology, Siemens Healthcare IM BM PI, & Department of Radiology, University Hospital (CHUV), Lausanne, Switzerland, 3 LTS5, cole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland, 4 CIBM, cole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland, 5 High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Tbingen, Germany, 6 Department for Biomedical Magnetic Resonance, University of Tbingen, Tbingen, Germany

The present study combines retrospective motion correction and GRAPPA reconstruction. We propose a technique that performs several alternations of GRAPPA interpolation and motion correction steps, suppressing the artifacts caused by motion over the course of the optimization. Motion parameters are estimated directly from the data with the aid of free induction decay navigators. The proposed algorithm does not require a priori knowledge of coil sensitivity profiles and can be applied retrospectively to data acquired with generic sequences such as MP-RAGE. The algorithm was tested on motion corrupted brain images of healthy volunteers, performing controlled head movement during the scan. Results demonstrate a significant improvement in image quality.

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