FIG 2. Spectroscopic images of NAA obtained from the brain of a young participant. Four representative ¹H MR spectra (C1–C4) were selected from the voxels (voxels 1–4) in the cortical (C1), semioval (C2), hippocampal (C3), and temporal (C4) regions to illustrate the regional variations. The nominal size (0.8 x 0.8 x 2 cm³) of the individual voxels is shown on the MRS images.

A, Localized at the centrum semiovale.

B, Localized in the temporal lobe.