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Test/retest and interrater reliability according to Bland-Altman. Horizontal lines indicate δ (bias – straight line) and the 2σ intervall (δ ± 2σ, σ - standard deviation – dashed line, limit of accordance). A: test/retest (intra-rater) reliability of 94% is within the limit of accordance. B: inter-rater reliability of 96% is within the limit of accordance. SI (ROI) is the average signal intensity within a ROI in a.u., ΔSI (ROI) is the test difference in a.u.
