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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Magn Reson Med. 2016 Jul 28;78(1):97–106. doi: 10.1002/mrm.26348

Figure 5.

Figure 5

Experimental pH measurements in phantoms. (a) The pH of 20 mM of iopamidol measured with acidoCEST MRI was correlated with the pH measured with a benchtop pH electrode (R2 = 0.83). (b) AcidoCEST MRI was used to measure the pH of solutions of iopamidol at pH 6.71 (the horizontal line shows the pH value of 6.71). The pH could be estimated with good precision at ≥ 10 mM concentration. Error bars in both graphs represent the 95% confidence intervals of the acidoCEST MRI fitting process.