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. Author manuscript; available in PMC: 2014 May 27.
Published in final edited form as: Contrast Media Mol Imaging. 2013 May-Jun;8(3):246–251. doi: 10.1002/cmmi.1524

Fig. 5.

Fig. 5

Comparison of the derived labile proton ratio and exchange rate. a) For the pH CEST phantom, the labile proton fraction ratio shows little change with pH (R2=0.603, P>0.12). b) The exchange rate increases exponentially with pH (R2=0.996, P<0.03). c) For the concentration phantom, the derived labile proton fraction ratio increases linearly with creatine concentration (R2=0.994, P<0.01). d) The chemical exchange rate shows very little change with the creatine concentration (R2=0.0903, P>0.60).