FIGURE 6. Bland–Altman analysis showing degree of concordance between myocardial blood flow (MBF) measured with ¹¹C-acetate and with ¹⁵O-water. Magnitude of bias was small (0.02 mL/g/min), with limits of agreement ranging from value of -0.22 mL/g/min to 0.27 mL/g/min. No trends in residuals were observed as function of increasing blood flow rate.