Dynamic sequence at the University of Washington is performed on a 3T scanner
| Parameters | Philipsa | Siemensb | GEc |
|---|---|---|---|
| Coil | 16-Channel neurovascular coil | ||
| Parallel imaging | SENSE | iPAT | ASSET |
| Sequence | 3D-T1WI FFE | 3D-T1WI FISP or 3D-T1WI FLASH | 3D-T1WI FSPGR |
| TR/TE for T1 mapping | 5.2/2.5 ms | ||
| MFA for T1 mapping | 30°, 20°, 15°, 10°, and 2° | ||
| TR/TE/FA for dynamic imaging | 5.2/2.5 ms/5° | ||
| FOV | 212 × 149 mm2 | ||
| Voxel | 0.95/0.95/3.00 mm3 | ||
| Section thickness | 3 mm | ||
| Signal averaging | NSA: 1 | ACQ: 1 | NEX: 1 |
| Number of sections per dynamic scan/section orientation | 20/Axial | ||
| Temporal resolution | 3.6 seconds | ||
| Total T1 mapping acquisition time | 26.5 seconds | ||
| Total dynamic acquisition time | 6.10 minutes | ||
| Fat saturation | No | ||
| Contrast injection | Single dose of 20-mL gadoteridol (ProHanced) injected at a rate of 5 mL/s through a peripheral arm vein, followed by a 20-mL saline flush with a power injector |
Note:—FFE indicates fast-field echo; FSPGR, fast-spoiled gradient recalled; MFA, multiple flip angles; SENSE, sensitivity encoding; iPAT, integrated parallel acquisition technique; ASSET, array spatial sensitivity encoding technique; NSA, number of signal averages; ACQ, acquisitions; FA, flip angle.
↵a Phillips Healthcare, Best, the Netherlands.
↵b Siemens, Erlangen, Germany.
↵c GE Healthcare, Milwaukee, Wisconsin.
↵d Bracco Diagnostics, Princeton, New Jersey.