Perfusion MR imaging parameters
| Sequence Parameters | spASL | mpASL | DSC |
|---|---|---|---|
| Acquired orientation | Axial | Axial | Axial |
| TR (ms) | 4000 | 250 | 1800 |
| TE (ms) | 25 | 20 | 40 |
| Flip angle | 70° | 35° | 75° |
| FOV (mm2) | 240 | 240 | 224 |
| Matrix (pixel) | 68 × 68 | 68 × 68 | 88 × 88 |
| Thickness/gap (mm) | 6/0.6 | 6/0.6 | 5/0 |
| Pulse delay times (ms) | 1200 | 300, 550, 800, 1050, 1300, 1550, 1800, 2050 | – |
| Label thickness/gap (mm) | 100/20 | 130/20 | – |
| Acquisition time | 4 min 8 sec | 4 min 8 sec | 1 min 40 sec |
Note:—–indicates “no labelling” and “no pulse delay time”; DSC, dynamic susceptibility contrast; FOV, field-of-view; mpASL, multi phase arterial spin-labeling; spASL, single phase arterial spin-labeling; TE, echo time; TR, repetition time.