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Fig 9a: Calculated pH uncertainty map for an injured subject overlaid on its axial proton image. Based on SNR alone, the uncertainty in every voxel in the region containing lung and heart was well below 0.1 pH units. Fig 9b: Calculated pH uncertainty map for a healthy subject overlaid on its axial proton image. The SNR-based uncertainty in each voxel is significantly higher than in its injured counterpart.
