Table 2. Inversion recovery (IR) measurement protocols.
| T1—VTI Series | GE Medical Systems | Philips | Siemens |
|---|---|---|---|
| Sequence | 2D/FSE-IR | 2D/IR-SK | 2D/TSE-IR |
| Scan Plane | Coronal | Coronal | Coronal |
| Scan Options | EDR (Extended Dynamic Range) | 2D IR; Fast = TSE (Turbo Spin Echo) | |
| Section Thickness/Gap (mm) | 6 | 6 | 6 |
| TR (ms) | 4500 | 4500 | 4500 |
| TE (ms) | Min Full (7.6) | 7 | 6.9 |
| TI Values (ms) | 50, 75, 100, 125, 150, 250, 1000, 2000, 3000 | 35, 75, 100, 125, 150, 250, 1000, 1500, 2000, 3000 | 35, 75, 100, 125, 150, 250, 1000, 1500, 2000, 3000 |
| Echo Train Length (ETL) | 3 | 6 | 6 |
| Number of Averages | 1 | 1 | 1 |
| Matrix (Frequency Encode) | 256 | 256 | 256 |
| Matrix (Phase Encode) | 192 | 252 | 192 |
| Matrix (Slice Encode)/# of Slices | 1 | 1 | 1 |
| Pixel Bandwidth (Hz) | 391 | 436 | 279 |
| Bandwidth (kHz)–GE only | 50 | ||
| FOV (FE, mm) | 250 | 250 | 250 |
| FOV (PE, mm) | 200 (0.8 PFOV) | 250 | 250 |
| Pixel Size (mm x mm) | 0.98 x 0.98 | 0.98 x 0.98 | 0.98 x 0.98 |
| Phase Encode Direction | RL | RL | RL |
| Notes | Minimum TI allowed on GE: 50ms Autoprescan with TI = 50 ms |
Reconstruct Magnitude, Real, Imaginary images. Do “FullPrep” for each of these ten series. | Use SOS (sum-of-squares) multi-channel coil reconstruction, not default ACC (adaptive coil combine). |
| Series | T1 VTI | T1 VTI | T1 VTI |
| Approximate Acquisition Time per TI Setting (min) | 4.0 | 3.5 | 3.02 |
| # of TI Settings | 9 | 10 | 10 |
| Total Time for this Series (min) | 36.0 | 35.0 | 30.20 |