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Abstract #3680

A comprehensive assessment of methods for combining phase data from array radio-frequency coils at 7 T

Simon Daniel Robinson1, Korbinian Eckstein1, José Rebelo Ferreira Marques2, Berkin Bilgic3, Siegfried Trattnig1, and Ferdinand Schweser4,5

1Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, 2Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Netherlands, 3Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, MA, United States, 4Department of Neurology, University at Buffalo, NY, United States, 5MRI Clinical and Translational Research Center, University at Buffalo, NY, United States

Methods for combining phase data from array RF coils are quantitatively compared at 7 T. Of the reference-free approaches (which all leave arbitrary contributions to the total phase), the Virtual Reference Coil method yielded the best phase matching. The reference-free method COMPOSER removed non-B0-related phase but requires an artifact-free short echo-time reference measurement. Of the multi-echo methods, SVD, HIP and ASPIRE all had uniform phase matching. ASPIRE has higher CNR for a narrow range of echo times, but requires TE2=2 x TE1. The data and assessment scripts used in this study will be made publicly available.

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