Table 2.
DUS gating results
| RR intervals | RR length (ms) | Difference in RR length (msec) | Variability (msec) | Sensitivity (%) | ||
|---|---|---|---|---|---|---|
| 1.5T | Heart phantom | 2924 | 408 ± 127 | – | 0.1 ± 0.01 | 100 |
| DUS device | 2924 | 404 ± 126 | 5.5 ± 4.5 | 6.4 ± 2.1 | 100 | |
| 3T | Heart phantom | 2789 | 444 ± 147 | – | 0.1 ± 0.01 | 100 |
| DUS device | 2789 | 443 ± 147 | 5.6 ± 4.6 | 6.5 ± 2.8 | 100 | |
| Fetal verification | Heart cycle | 1876 | 434 ± 32 | – | 22.0 ± 7.6 | 100 |
| DUS device | 1860 | 434 ± 31 | 0.01 ± 11 | 22.2 ± 7.1 | 99.1 |
The values shown in the tables are the Doppler ultrasound (DUS) gating results for the phantom study at 1.5T and 3T and for the in vivo verification study outside the MRI room. RR, beat-to-beat.