A voxel-based implementation of the Bloch-Siegert phase shift method within a semi-LASER based localization sequence that shows a high robustness to determine transmit gain (TG) for the same volume that is excited for the spectroscopy experiment is demonstrated at 7T. Phantom and in-vivo measurements show higher robustness over a large range of initial TG settings and voxel locations resulting in a faster and more reliable calibration procedure to achieve good voxel selection and spectrum quality and avoid additional calibration steps.
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