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. Author manuscript; available in PMC: 2016 May 23.
Published in final edited form as: Mol Imaging. 2012 Feb;11(1):47–57.

Figure 5.

Figure 5

The precision of pH measurements. A, Solutions of Yb-DO3A-oAA with T1Wsat greater than 1.5 s were used to measure pH at 600 MHz magnetic field strength. The standard deviation was determined from three trials per concentration. B, Solutions of Yb-DO3A-oAA at 40 mM concentration were used to measure pH at 300 MHz magnetic field strength. The standard deviation was determined from three trials per T1Wsat value. The average standard deviation of pH measurements was 0.11 pH units for samples with at least 10 mM concentration and 0.5 s T1Wsat.