TABLE 1. Acquisition Parameters for Single- and Multi-echo Sequencesa.
3D SWI | 3D TOF-MRA | 3D Multi-echo MRA/SWI | |
---|---|---|---|
Slice thickness | 2 mm | 1 mm | 1 mm |
Slab thickness | 1 slab | 3 slabs | 3 slabs |
36 slice | 30 slices/slab | 36 slices /slab | |
6 overlapping slices | 12 overlapping slices | ||
Bandwidth | 15.25 kHz | 41.76 kHz | 41.76 kHz |
K-Space coverage | Full | Partial (65%) | Partial (65%) |
TR | 50 ms | 30 ms | 40 ms |
TE(s) | 16 ms | 2.7 ms | 2.7, 10.5, 13.2, 20.9 ms |
Acquisition time | 4 mins/50 s | 6 mins/40 s | 10 mins/36 s |
Parameters that are the same to all 3 sequences: FOV 24 cm, flip angle 25°, acquisition matrix 512 × 384, in-plane resolution 0.46 × 0.63 mm2, and acceleration factor 3.