Intra- and interobserver variability in volunteers. Intra- (A) and (B) and interobserver (C) and (D) variability for global myocardial T2 in short axis based on the steady state free precession sequence in volunteers. Scatterplots (A and C) and Bland-Altman plots (B) and (D) are given. Red lines indicate bias. Green lines indicate the limits of agreement (1.96 x standard deviation). Due to overlap dots stand for more than 1 data point.