MRA protocol
| Routine MRA | Coiled Aneurysm |
||
|---|---|---|---|
| Ultrashort TE TOF MRA | Contrast-Enhanced MRA | ||
| Technique | 6-Slab MOTSA | 3-Slab MOTSA | 3D SPGR single volume |
| Flow comp | ON | OFF | OFF |
| BW | 15 kHz | 32 kHz | 32 kHz |
| Minimal TE | 3.7 ms | ∼2 ms | ∼2 ms |
| TR | 33 ms | 33 ms | 14 ms |
| Flip angle | 20° | 20° | 30° |
| Section thickness | 1.4 mm | 1.4 mm | 1.4 mm |
| F × P | 320 × 192 | 384 × 244 | 512 × 256 |
Note:—MOTSA indicates multiple overlapping thin-slab acquisition; TR, repetition time; SPGR, spoiled gradient-recalled-echo; Flow comp, flow compensation; BW, bandwidth; F, frequency; P, phase.