(a) Comparison of rate constants kPi→γATP, kPCr→γATP, σγ↔βATP (σα↔βATP) and 1/T1 for Pi, PCr, α-, β- and γ-ATP between “test” and “retest” experiments, showing the reproducibility of short-TR band inversion performance at 7T. The results are from integrated fitting using 31P magnetization data acquired from all three modules as illustrated in Figure 1c.