Sagittal (left) and axial (right) anatomical images illustrating extracted spectral data from a 3D CSI voxel grid (2.1 × 2.1 × 2.1cm) from a region placed in the anterior cingulate cortex of a healthy subject, and the associated 31P spectrum (below). Abbreviations: PME, phosphomonoesters; PE, phosphoethanolamine; PC, phosphocholine; Pi, inorganic phosphate; PDE, phosphodiesters; GPE, glycerophosphoethanolamine; GPC, glycerophosphocholine; PCr, phosphocreatine; NTP, nucleoside triphosphate.