Table 2.
Intra- and Inter-observer variability of Ecc and PEDSR by tagging, FT and TT at 1.5 T and 3.0 T CMR
| Tagging | Feature tracking (FT) | Tissue tracking (TT) | ||||
|---|---|---|---|---|---|---|
| Intra-observer | Inter-observer | Intra-observer | Inter-observer | Intra-observer | Inter-observer | |
| 1.5 T (n = 10) | ||||||
| Ecc (%) | ||||||
| COV (%) | 9.3 | 14.6 | 5.2 | 6.5 | 8.4 | 11.1 |
| ICC | 0.98 | 0.95 | 0.99 | 0.98 | 0.98 | 0.97 |
| Mean Diff (SD) | 0.11 (0.89) | 0.56 (1.4) | − 0.27 (0.91) | 0.59 (1.1) | 0.19 (1.3) | − 0.15 (1.7) |
| LoA | − 1.64 to + 1.86 | − 2.14 to + 3.25 | − 2.04 to + 1.51 | − 1.58 to + 2.76 | − 2.35 to + 2.72 | − 3.53 to + 3.24 |
| PEDSR (s−1) | ||||||
| COV (%) | 14.8 | 20.3 | 10.1 | 10.3 | 13.1 | 13.6 |
| ICC | 0.96 | 0.94 | 0.97 | 0.96 | 0.96 | 0.95 |
| Mean Diff (SD) | − 0.05 (0.08) | − 0.003 (0.11) | − 0.02 (0.15) | 0.06 (0.15) | 0.01 (0.12) | − 0.001 (0.13) |
| LoA | − 0.21 to + 0.11 | − 0.21 to + 0.21 | − 0.31 to + 0.27 | − 0.22 to + 0.35 | − 0.22 to + 0.25 | − 0.25 to + 0.25 |
| 3.0 T (n = 10) | ||||||
| Ecc (%) | ||||||
| COV (%) | 4.0 | 9.2 | 4.3 | 6.5 | 10.3 | 4.4 |
| ICC | 0.99 | 0.93 | 0.95 | 0.92 | 0.88 | 0.97 |
| Mean diff (SD) | 0.23 (0.54) | − 0.22 (1.3) | − 0.23 (0.81) | 0.73 (1.2) | 0.24 (1.8) | 0.53 (0.75) |
| LoA | − 0.83 to + 1.29 | − 2.70 to + 2.26 | − 1.82 to + 1.36 | − 1.60 to + 3.05 | − 3.19 to + 3.68 | − 0.93 to + 2.00 |
| PEDSR (s−1) | ||||||
| COV (%) | 11.0 | 20.2 | 7.0 | 6.0 | 10.1 | 20.8 |
| ICC | 0.97 | 0.93 | 0.95 | 0.97 | 0.98 | 0.90 |
| Mean Diff (SD) | − 0.04 (0.07) | − 0.06 (0.12) | − 0.003 (0.1) | 0.02 (0.09) | − 0.05 (0.1) | − 0.001 (0.2) |
| LoA | − 0.17 to + 0.09 | − 0.30 to + 0.18 | − 0.21 to + 0.20 | − 0.16 to + 0.19 | − 0.24 to + 0.14 | − 0.39 to + 0.39 |
CMR Cardiovascular magnetic resonance, CoV coefficient of variation, Ecc global circumferential strain, FT feature tracking, ICC intra-class correlation coefficient, LoA 95% limits of agreement, PEDSR global circumferential peak-early diastolic strain rate, TT tissue tracking