Scanning parameters of ASL-MRA and CE-MRA
| Parameter | ASL-MRA | CE-MRA |
|---|---|---|
| MRA type | Dynamic (4D) | Dynamic (4D) |
| Scan duration (min:sec) | 5:58 | 3:19 |
| Contrast | ||
| Acquisition | T1-TFEPI | T1-FFE |
| TR (ms) | 12 | 3 |
| TE (ms) | 5 | 1 |
| Flip angle | 10° | 25° |
| Resolution | ||
| FOV (RL × AP × CC mm) | 210 × 210 × 90 | 150 × 210 × 210 |
| Acquisition | Transversal | Sagittal |
| Slabs | 1 | 1 |
| Acquisition matrix | 172 × 172 × 70 | 50 × 248 × 248 |
| Acquired voxel size (mm) | 1.22 × 1.26 × 1.3 | 3 × 0.85 × 0.85 |
| Reconstruction matrix | 256 × 256 | 288 × 288 |
| reconstructed voxel size (mm) | 0.82 × 0.82 × 0.65 | 1.5 × 0.73 × 0.73 |
| No. of slices | 140 | 100 |
| SENSE factor | 2.5/1 | 4/2 |
| Dynamic acquisition | ||
| Dynamic imaging mode | TFEPI | CENTRA keyhole |
| No. of dynamic phases | 8 | 24 |
| Phase interval (temporal resolution) (ms) | 200 | 608 |
| Label delay (ms) | 200 | – |
| Contrast | – | Gadovist 0.1 mL/Kg; IV pump injection: 3.5 mL/s |
Note:—indicates non-applicable; TFEPI, Turbo-field echo-planar imaging; FFE, fast-field echo; CENTRA, enhanced robust-timing angiography; RL, right-left; AP, anterior-posterior; CC, caudo-cranial; SENSE, sensitivity encoding.