Table 2.
Sensitivity results for Heart 2. The results of Heart 2 analyses show similar trends to those seen in the Heart 1 analyses. An SNR level of 0.5 (bold) caused severe degradation of the registration results also with large increases in %RMSE and a reduction of the R 2 values.
| Cir. strain | Radial strain | |||
|---|---|---|---|---|
| %RMSE | R 2 | %RMSE | R 2 | |
| Validation study | 0.093 | 0.830 | 0.113 | 0.780 |
| SNR 8 | 0.095 | 0.824 | 0.113 | 0.773 |
| SNR 4 | 0.099 | 0.820 | 0.113 | 0.773 |
| SNR 1 | 0.099 | 0.821 | 0.113 | 0.804 |
| SNR 0.5 | 0.329 | 0.094 | 0.412 | 0.080 |
| SNR 0.1 | 0.114 | 0.790 | 0.124 | 0.770 |
| Reduction in fiber angle (+5%) | 0.092 | 0.830 | 0.110 | 0.780 |
| Increase in fiber angle (−5%) | 0.092 | 0.840 | 0.100 | 0.790 |
| 10% reduction in intensity | 0.092 | 0.850 | 0.100 | 0.800 |
| 20% reduction in intensity | 0.095 | 0.840 | 0.100 | 0.790 |
| 40% reduction in intensity | 0.096 | 0.830 | 0.110 | 0.790 |
| No active contraction | 0.156 | 0.638 | 0.214 | 0.612 |