Table 1. Vendor-specific parameters of the pCASL product sequences.
| GE | Philips | |
|---|---|---|
| Readout sequence | 3D FSE stack-of-spirals | 2D gradient-echo single-shot EPI |
| Acquisition matrix | 8 arms with 512 sampling points | 80 * 80 |
| Parallel imaging | No | SENSE factor = 2.5 |
| Voxel size | 3.75 * 3.75 * 4 mm3 | 3 * 3 * 7 mm3 |
| Field of view (FOV) | 24 * 24 cm2 | 24 * 24 cm2 |
| Number of slices | 36 | 17 |
| Echo time | 10.5 ms | 17 ms |
| Repetition time | 4 600 ms | 4 000 ms |
| Flip angle | 111° | 90° |
| Labeling duration | 1 450 ms | 1 650 ms |
| Post-labeling delay | 1 525 ms | 1 525 ms |
| Labeling plane (distance from AC-PC line a in head-feet direction) | 89 mm | 72 mm |
| Background suppression | Yes | Yes |
| Vascular crushers | No | No |
| Total scanning time | 2:01 min | 2:08 min |
| NEX (no. of excitations) GE; NSA (no. of repetitions) Philips | 1 | 16 |
a anterior commissure–posterior commissure line