Table 1.
Detailed sequence parameters of the acquired cine CMR sequences.
| 1.5 T |
3 T |
7 T | |||
|---|---|---|---|---|---|
| FLASH | TrueFISP | FLASH | TrueFISP | FLASH | |
| TR [ms] | 49.14 | 39.39 | 50.76 | 29.1 | 40.9 |
| TE [ms] | 3.45 | 1.36 | 2.89 | 1.27 | 4.76 |
| Matrix [pixel] | 208*136 | 208*170 | 208*141 | 208*144 | 240*196 |
| Field of View [mm2] | 340*278 | 340*278 | 340*278 | 340*285 | 360*294 |
| Flip angle [°] | 15 | 54 | 12 | 38 | 70 |
| Segments | 7 | 13 | 9 | 10 | 5 |
| Calculated phases | 25 | 25 | 25 | 25 | 25 |
| Spatial resolution [mm3] | 1.6 × 1.97 × 4 | 1.6 × 1.6 × 4 | 1.6 × 1.97 × 4 | 1.6 × 1.98 × 4 | 1.5 × 1.5 × 3 |
| Voxel Volume [mm3] | 12.6 | 10.2 | 12.6 | 12.7 | 6.8 |
| Temporal resolution [ms] (given a mean heart rate of 70 bpm) |
2.8 | 2.8 | 2.8 | 2.8 | 2.8 |
| Bandwidth [Hz/px] | 253 | 925 | 445 | 1502 | 992 |
| pMRI Grappa | R = 1 | R = 2 | R = 1 | R = 3 | R = 2 |
| Number of active RF coil channels | 20-32 Rxa | 20-32 Rxa | 20-32 Rxa | 20-32 Rxa | 8 Tx/Rx |
FLASH, Fast Low-Angle Shot sequence; TrueFISP, True Fast Imaging balanced Steady-state free Precession; TR, repetition time; TE, echo time; pMRI, parallel MRI; RF, radiofrequency; Rx, receive; Tx, transmit;
a
Using auto coil select mode. In TrueFISP relatively low flip angle had to been chosen due to SAR-restrictions.