FIG 2. A, Axial image from a contrast-enhanced SPGR 3D volume dataset (34/3/1) of a patient with an oligoastrocytoma. The locations for which spectra are reconstructed are shown by the grid.

B, Spectral array (16 x 8 x 8 [phase encodes], 1000/144/1) corresponding to the grid shown in the image of A. Note the high NAA levels and moderate choline and creatine levels in the spectra corresponding to the normal MR regions (right side of spectral array). Note the very high choline and low NAA in portions of the contrast enhancement and surrounding tissue (dashed lines) and the lower metabolites in adjacent tissue (double lines).