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Table 2 Intra-observer and inter-observer variability of the area-at-risk by T1 and T2. Intra-observer and inter-observer variability of the area-at-risk by T1 and T2. This table provides the intra-class correlation coefficient (ICC) and mean difference ± SD for the inter-observer and intra-observer measurements of T1 mapping and T2 mapping using 3 analytical techniques for inter-observer and intra-observer variability

From: T1 mapping and T2 mapping at 3T for quantifying the area-at-risk in reperfused STEMI patients

  ICC (95 % CI) Mean difference ± SD (%) P
Intra-observer variability (n = 107)  
T1 mapping    
Manual 0.961 (0.943 – 0.973) 1.5 ± 7.1 0.04*
2SD 0.948 (0.917 – 0.966) 2.6 ± 7.7 0.001*
Otsu 0.989 (0.984 – 0.993) 0.7 ± 3.2 0.03*
T2 mapping    
Manual 0.951 (0.928 – 0.966) 0.8 ± 6.4 0.18
2SD 0.965 (0.942 – 0.978) 2.4 ± 6.4 0.001*
Otsu 0.996 (0.995 – 0.998) 0.2 ± 1.9 0.24
Inter-observer variability (n = 107)  
T1 mapping    
Manual 0.980 (0.972 – 0.987) 0.3 ± 4.3 0.52
2SD 0.948 (0.925 – 0.964) 3.7 ± 7.2 0.001*
Otsu 0.993 (0.990 – 0.995) 0.2 ± 2.6 0.55
T2 mapping    
Manual 0.964 (0.947 – 0.975) 0.3 ± 6.1 0.59
2SD 0.960 (0.914 – 0.978) 3.5 ± 6.5 0.001*
Otsu 0.993 (0.989 – 0.995) 0.7 ± 2.6 0.008*
  1. *denotes significant statistical difference with P  <  0.05