Abstract #2881

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

Ana Gogishvili^1,2, Michael Schwerter^1,3, Ezequiel Farrher¹, Ketevan Kotetishvili², and N. Jon Shah^1,4,5,6

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 B₀homogeneity 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 2^ndorder shim coils and only provide shim values for a specific voxel position. In contrast, fieldmap-based approaches for B₀shimming 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.

This abstract and the presentation materials are available to members only; a login is required.

Join Here