In vitro experiments on the iopamidol-serum phantom were analyzed to study the tolerance of our pH measurements to ΔB0 (Hz). The ST ratio of 4.2 and 5.5 ppm was calculated for each pH between 5.7 and 7.3 for ΔB0 values up to ±301.4 Hz in steps of 27.4 Hz using our experimental Z-spectra. Using the in vitro calibration equation, corresponding pH values were obtained at ΔB0 = 0, ±60, ±120, and ±180 Hz for ω1 = 3 μT and ω1 = 4 μT.

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