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 Schweser^4,5

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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