Table 6.
Intra-observer and inter-observer reproducibility for CMR-FT derived strain parameters.
| Intra-observer | Inter-observer | |||
|---|---|---|---|---|
| ICC | 95% CI | ICC | 95% CI | |
| Dyssynchrony parameters | ||||
| LVLD (ms) | 0.92 | 0.84-0.96 | 0.89 | 0.81-0.94 |
| LVCD (ms) | 0.89 | 0.80-0.96 | 0.84 | 0.75-0.92 |
| LVRD (ms) | 0.83 | 0.68-0.94 | 0.80 | 0.65-0.85 |
| RVCD (ms) | 0.86 | 0.74-0.91 | 0.83 | 0.65-0.88 |
| RVRD (ms) | 0.82 | 0.67-0.89 | 0.80 | 0.59-0.86 |
| LV longitudinal strain | ||||
| Global (%) | 0.95 | 0.88-0.97 | 0.91 | 0.80-0.96 |
| Basal (%) | 0.91 | 0.80-0.95 | 0.85 | 0.74-0.90 |
| Mid (%) | 0.90 | 0.80-0.93 | 0.88 | 0.77-0.92 |
| Apical (%) | 0.89 | 0.76-0.93 | 0.83 | 0.70-0.93 |
| LV circumferential strain | ||||
| Global (%) | 0.93 | 0.86-0.98 | 0.90 | 0.81-0.95 |
| Basal (%) | 0.90 | 0.76-0.96 | 0.86 | 0.73-0.91 |
| Mid (%) | 0.92 | 0.81-0.95 | 0.85 | 0.71-0.92 |
| Apical (%) | 0.87 | 0.77-0.90 | 0.83 | 0.69-0.90 |
| LV radial strain | ||||
| Global (%) | 0.91 | 0.79-0.96 | 0.85 | 0.68-0.95 |
| Basal (%) | 0.87 | 0.73-0.92 | 0.83 | 0.67-0.91 |
| Mid (%) | 0.89 | 0.75-0.94 | 0.84 | 0.70-0.93 |
| Apical (%) | 0.85 | 0.71-0.93 | 0.82 | 0.65-0.90 |
| RV strain parameters | ||||
| GLS (%) | 0.89 | 0.80-0.94 | 0.87 | 0.79-0.92 |
| GCS (%) | 0.90 | 0.78-0.96 | 0.86 | 0.71-0.94 |
| GRS (%) | 0.87 | 0.69-0.96 | 0.81 | 0.62-0.89 |
CI, confidence interval; CMR, cardiac magnetic resonance; FT, feature tracking; ICC, intraclass correlation coefficient; LV, left ventricular; RV, right ventricular; LD, longitudinal dyssynchrony; CD, circumferential dyssynchrony; RD, radial dyssynchrony; GCS, global circumferential strain; GLS, global longitudinal strain; GRS, global radial strain.