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Abstract #2881

Comparison of an advanced, fieldmap-based shimming approach and FASTESTMAP for single-voxel 1H MR spectroscopy at 7T

Ana Gogishvili1,2, Michael Schwerter1,3, Ezequiel Farrher1, Ketevan Kotetishvili2, and N. Jon Shah1,4,5,6
1Institute of Neuroscience and Medicine 4, Foschungszentrum Jülich, Jülich, Germany, 2Engineering Physics Department, Georgian Technical University, Tbilisi, Georgia, 3Faculty of Mathematics, Computer Science and Natural Sciences, RWTH Aachen University, Aachen, Germany, 4Department of Neurology, Faculty of Medicine, RWTH Aachen University, Aachen, Germany, 5JARA - BRAIN - Translational Medicine, RWTH Aachen University, Aachen, Germany, 6Institute of Neuroscience and Medicine 11, Foschungszentrum Jülich, Jülich, Germany

Proton MRS only benefits from ultra-high field strengths if good B0 homogeneity is achieved. For this, projection-based B0 shim techniques, e.g. FASTMAP, are commonly used in single-voxel acquisitions. However, FASTMAP and its variants typically only use up to 2nd order shim coils and only provide shim values for a specific voxel position. In contrast, fieldmap-based approaches for B0 shimming have no shim order restrictions and can be used to calculate multiple shim settings over different ROIs from a single acquisition. Here we compare projection and fieldmap-based shim approaches in brain areas known to be problematic in terms of B0 homogeneity.

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