FIG 2. A–C, Typical proton MR spectra obtained from the allocortex (A), parietal cortex (B), and frontal cortex (C). Acquisition and processing parameters used for all spectra are the same as described in the text, except for voxel sizes, which are 5.0 mL for the allocortex and 7.2 mL for the isocortex. All spectra are scaled individually and cannot be used for direct comparison. NAA, 2.01 ppm; Cr, 3.03 ppm; Cho, 3.22 ppm; mI, 3.56 ppm