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. Author manuscript; available in PMC: 2016 Jan 16.
Published in final edited form as: Contrast Media Mol Imaging. 2015 Jul 14;10(6):481–486. doi: 10.1002/cmmi.1651

Figure 3.

Figure 3

The calculated ratio of R2/R1 for (Gd-DOTA-4AmP)44-G5 at four different concentrations and three different pH values at 7 T: top line, pH = 8.84, middle line, pH = 7.40, bottom line, pH = 6.96. The ratio R2/R1 does not vary significantly with concentration of contrast agent at the lower pH values, but there is a small and significant variation at the higher pH, which lies outside the range of values usually encountered in tumor tissues.