FIG 4. Multiple MR spectra (16 x 8 x 8, 1000/144/1) and corresponding images (contrast-enhanced SPGR [34/3/1]) centered on biopsy locations for a patient with a newly diagnosed GBM. Higher normalized choline levels were observed in the location of the biopsy with 90% tumor compared with others of lower percentages. (WM = white matter)