MR Spectrocopy of Arbitrarily Shaped Single Voxel Using Segmented, Blipped-Planar 2D-Selective RF Excitations with Weighted Averaging

NAA and lactate acquired with (a) cross-sectional RF excitations (63 averages) defining a square of 8x8 mm, i.e. the largest square fitting into the corpus callosum profile, and (b,c) with segmented 2DRF exciting the full corpus callosum profile shown in Fig. 1 with (b) standard averaging, i.e. 9 averages for each of the 7 segments, and (c) weighted averaging with 31 averages for the central k-space segment and a total number of 61 averages. The scaling is identical for all spectra, i.e. different peak amplitudes rather good reflect SNR differences. MR Spectrocopy of Arbitrarily Shaped Single Voxel Using Segmented, Blipped-Planar 2D-Selective RF Excitations with Weighted Averaging