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

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

	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*

ISSN: 1532-429X