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(a) Calculated APT#, NOE#, and MTRasym(3.5ppm) signal intensities. (b) Calculated corresponding image contrasts using signal intensity differences between the tumor and contralateral brain regions. Error bars depict standard errors. The statistical significance of the signal intensity difference compared with the contralateral brain region for each group: * p < 0.05, *** p < 0.001, not marked = not significant.
