Table 2.
Technical parameters
| 1.5 T | 3.0 T | |||
|---|---|---|---|---|
| SSFP cine | HR-MRA | SSFP cine | HR-MRA | |
| TR per line (ms) | 3.1 – 3.8 | 2.7 – 3.3 | 3.0 – 3.8 | 2.8 – 3.5 |
| TE (ms) | 1.3 – 1.8 | 1.0 – 1.3 | 1.3 – 1.6 | 1.0 – 1.4 |
| Flip angle (°) | 60 – 80 | 12 – 30 | 38 – 50 | 14 – 20 |
| Bandwidth (Hz/pixel) | 888 – 1130 | 610 – 698 | 925 – 930 | 579 – 635 |
| Field of view (mm2) | 113 – 225 | 121 – 500 | 90 – 244 | 131 – 312 |
| x | x | x | x | |
| 199 – 371 | 196 – 500 | 180 – 340 | 280 – 500 | |
| Acquisition matrix | 85 – 150 | 448 – 576 | 96 – 162 | 210 – 328 |
| x | x | x | x | |
| 192 – 256 | 140 – 346 | 192 – 208 | 512 – 640 | |
| Slice thickness (mm) | 3.5 – 6.0 | 0.8 – 1.3 | 3.0 – 6.0 | 0.7 – 0.9 |
| In-plane resolution (mm2) | 1.0 – 1.7 | 0.8 – 1.3 | 0.9 – 1.6 | 0.6 – 1.0 |
| x | x | x | x | |
| 0.8 – 1.0 | 0.7 – 1.0 | 0.9 – 1.8 | 0.5 – 1.0 | |
| Parallel imaging factor | 2 | 2 – 4 | 2 | 2 – 4 |
| Number of signal averages | 1 | 1 | 1 | 1 |
| Specific absorption rate (W/kg) | 2.5 ± 0.9 | 2.1 ± 0.7 | 2.8 ± 1.3 | 2.5 ± 1.3 |
| Acquisition time | 7.5 ± 2.0 (sec per slice) | 20.6 ± 3.7† | 5.8 ± 1.7 (sec per slice) | 21.2 ± 3.2† |
*Values are reported as minimum – maximum. Where relevant, values are reported as mean ± SD. For 1.5 T: Magnetom TIM Avanto (Siemens Medical Solutions; Malvern, PA); gradient strength = 45 mT/m, slew rate = 200 mT/m/ms. For 3.0 T: Magnetom TIM Trio (Siemens Medical Solutions; Malvern, PA), gradient strength = 40 mT/m, slew rate = 200 mT/m/ms
†Scan time for CE-MRA sequence reflects seconds/acquisition
‡ sec seconds, TE echo time, TR repetition time