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Proton MR spectra (TR/TE, 2000/135) in two patients with NPH. The spectra obtained from periventricular regions (upper row) with the intraventricular spectra (lower row) are shown. Apparent inverted doublet peaks at 1.3 ppm are observed in the intraventricular spectrum of one case (left side) and can be recognized as lactate peaks. In the other case (right side), good qualities of lactate peaks are seen compared with the peaks from the periventricular region in the upper row
