Parallel 2D-RF Excitation for Arbitrarily Shaped Regionof-Interest MR Spectroscopy at 16.4 T

Dinesh K. Deelchand¹, Xiaoping Wu¹, Pierre-Gilles Henry¹, Pierre-Francois Van de Moortele¹

In this study we demonstrate with phantom experiments the feasibility of selectively exciting arbitrary shaped voxel using 2D-RF pulse design (segmented radial k-space trajectory) with parallel RF excitation at 16.4 T while achieving sufficient excitation bandwidth for 1H MR spectroscopy. A novel simulation guided segment-wise RF pulse design is introduced to tackle the issue of gradient imperfection and is shown to preserve the excitation quality in the presence of gradient waveform deviations.