Table 1.
Technical details of four extensively used rtMRI sequences
| Sequence 1 | Sequence 2 | Sequence 3 | Sequence 4 | |
|---|---|---|---|---|
| Magnetic field strength | 1.5 Tesla | 1.5 Tesla | 1.5 Tesla | 1.5 Tesla |
| Gradients | ZOOM | ZOOM | ZOOM | ZOOM |
| Spatial gradient Max. amplitude | 22 mT/m | 40 mT/m | 40 mT/m | 40 mT/m |
| waveform design Max. slew rate | 77 T/m/s | 150 T/m/s | 150 T/m/s | 150 T/m/s |
| Coil | 4-channel | 4-channel | 4-channel | 8-channel |
| Slice thickness | 5 mm | 5 mm | 5 mm | 6 mm |
| Readout duration (Tread) | 2.552 ms | 2.520 ms | 2.584 ms | 2.520 ms |
| Repetition time (TR) | 6.164 ms | 6.004 ms | 6.028 ms | 6.004 ms |
| Field of view (FOV) | 20 cm × 20 cm | 20 cm × 20 cm | 20 cm × 20 cm | 20 cm × 20 cm |
| Spatial resolution | 3.0 mm × 3.0 mm | 2.4 mm × 2.4 mm | 3.0 mm × 3.0 mm | 2.4 mm × 2.4 mm |
| Pixel dimension | 68 × 68 | 84 × 84 | 68 × 68 | 84 × 84 |
| Number of interleaves | 13 | 13 | 9 | 2 (Golden angle interleaving) |
| Relative SNR efficiency | 1.00 | 0.63 | 0.83 | (Not assessed) |
| Time to acquire full image | 80.1 ms | 78.1 ms | 54.3 ms | 12 ms |
| View-sharing TR-increment | 7 | 7 | 5 | (No view-sharing) |
| Reconstruction frame-rate | 23.18 fps | 23.79 fps | 33.18 fps | 83 fps |