Table 6.
Intra- and inter-observer reproducibility for RV strain and strain rate measurements derived by fast and conventional feature tracking approaches
| Method | RV strain /strain rate | Intra-observer (n = 30) | Inter-observer (n = 30) | ||
|---|---|---|---|---|---|
| Bias (limits of agreement) | CV (%) | Bias (limits of agreement) | CV (%) | ||
| Fast strain approach | Fast GLS, % | − 0.1 (− 1.6, 1.4) | 2.9 | − 0.3 (− 2.3, 1.8) | 3.9 |
| Fast GLSRs, 1/s | − 0.04 (− 0.20, 0.12) | 6.3 | − 0.03 (− 0.22, 0.17) | 7.0 | |
| Fast GLSRe, 1/s | − 0.02 (− 0.23, 0.20) | 6.5 | − 0.03 (− 0.30, 0.23) | 8.1 | |
| Fast GLSRa, 1/s | − 0.03 (− 0.21, 0.15) | 7.5 | − 0.03 (− 0.27, 0.20) | 9.6 | |
| Feature tracking approach | GLS, % | − 0.2 (− 4.3, 3.9) | 6.0 | − 0.1 (− 5.3, 5.1) | 7.5 |
| GLSRs, 1/s | − 0.02 (− 0.33, 0.29) | 9.3 | − 0.02 (− 0.36, 0.32) | 10.1 | |
| GLSRe, 1/s | 0.10 (− 0.23, 0.43) | 12.1 | 0.04 (− 0.40, 0.47) | 13.3 | |
| GLSRa, 1/s | − 0.06 (− 0.37, 0.25) | 12.9 | − 0.04 (− 0.40, 0.32) | 14.4 | |
CV coefficient of variation, GLS global longitudinal strain, GLSRs peak global longitudinal strain rate during systole, GLSRe peak global longitudinal strain rate during early diastole, GLSRa peak global longitudinal strain rate during late diastole, RV right ventricular