Summary of the essential imaging parameters for PICORE and FAIR ASL sequences
| PICORE Q2TIPS | FAIR-QUIPSS II | |
|---|---|---|
| Matrix | 64 × 64 | 64 × 64 |
| No. of sections | 20 | 24 |
| Pixel size (mm2) | 3.44 × 3.44 | 3.44 × 3.44 |
| Section thickness (mm) | 6 | 4 |
| Gap (mm) | 1 | 0 |
| FOV | 220 | 220 |
| Parallel imaging (GRAPPA) | 2 | 2 |
| Phase, partial Fourier | 7/8 | 6/8 |
| Section order | Ascending | Ascending |
| Section orientation | ACPC aligned | ACPC aligned |
| Fat saturation | Yes | Yes |
| Coil-combination algo | Sum of squares | Sum of squares |
| Bandwidth | 2604 Hz/Px | 2368 Hz/Px |
| Echo-spacing | 0.47 | 0.49 |
| Saturation slab | Parallel feet, gap = 25.6 mm, thickness = 110 mm | Parallel feet/head gap = 10 mm, thickness = 100 mm |
| TE (ms) | 21 | 12 |
| TR (ms) | 5000 | 4000 |
| TI 1 (ms) | 700 | 600 |
| TI 2 (ms) | 1800 | 1600 |
| Saturation stop time (ms) | 1600 | |
| Flow limit (cm/s) | 5 | 100 |
| No. of images | 71 | 105 |
| Total acquisition time | 6 Minutes 12 seconds | 7 Minutes 6 seconds |
| Mo reference image | No | Yes |
Note:—ACPC indicates anterior/posterior commissure; algo, algorithm; Q2TIPS, quantitative imaging of perfusion with a single subtraction with thin-section TI1 periodic saturation; QUIPSS II, quantitative imaging of perfusion using a single subtraction II; Mo, steady-state magnetization; GRAPPA, generalized autocalibrating partially parallel acquisitions.