Fig. 6
Bland-Altman plots of the in vivo test-retest quantification of pH (a) and Pi/PCr ratio (b) in the human heart septum using long TR 31P-CMRS with adiabatic excitation at 7 T. The mean absolute differences between the two scans were 0.007 for pH and 0.003 for Pi/PCr, showing very low bias. The estimated repeatability coefficients were 0.052 for pH and 0.027 for the Pi/PCr ratio