Table 1:
Cine Imaging Parameters. A standard 1.5T Cartesian clinical cine protocol was used and the EPI and spiral in-out were designed with matched resolution, flip angle, acquired frames, and duration. Theoretical SNR is predicted relative to the Cartesian sequence considering only sampling duty cycle.
| Cartesian bSSFP | EPI bSSFP | Spiral in-out bSSFP | |
|---|---|---|---|
| Resolution (mm × mm) | 1.4 × 1.4 | 1.4 × 1.4 | 1.4 × 1.4 |
| FOV (mm × mm) | 360 × 270 | 360 × 308 | 360 × 360 |
| Slice thickness (mm) | 8 | 8 | 8 |
| Acceleration factor | 2 | 1 | 1.25 VDS |
| Flip Angle (degrees) | 60 | 60 | 60 |
| TRs per frame | 108 | 44 | 44 |
| TRs per frame per heartbeat | 10 | 4 | 4 |
| TR (ms) | 3.2 | 8 | 8 |
| TE (ms) | 1.6 | 4 | 4 |
| Echoes per TR | 1 | 5 | 1 |
| Receiver bandwidth (Hz/px) | 850 | 1150 | 545 |
| Average # of cine frames acquired (heartrate dependent) | 31 | 31 | 31 |
| Duration (heartbeats) | 12 | 12 | 12 |
| Sampling duty cycle | 0.34 | 0.52 | 0.69 |
| Theoretical relative SNR (by ) | 1.00 | 1.24 | 1.42 |