Table 4 Technical MRI sequence parameters
Sequence | Purpose | TR (ms) | TE (ms) | Flip angle (°) | FoV (mm) | Matrix | Slice width/slice gap (mm) | Acquisition time | Comment |
|---|---|---|---|---|---|---|---|---|---|
3D time of flight | Asses diameter MCA | 27 | 5.7 | 20 | 210 × 210 | 384 × 256 | 1.2/0.0 | 3 min 10 s | |
2D phase contrast | Assess flow in MCA | 11 | 5.2 | 30 | 160 × 160 | 256 × 224 | 5.0 | 4 min 7 s | 1 slice, 25 phases venc = 120 cm s− 1 |
Diffusion-weighted imaging | Produce ADC maps to quantify brain oedema | 13,729 | 86.2 | – | 240 × 240 | 256 × 256 | 4.0/1.0 | 5 min 57 s | b = 0, 800 and 1000 s.mm−2 |
T1 3D FSPGR | Assess brain and CSF volume | 8.5 | 3.3 | 12 | 240 × 180 | 256 × 256 | 1.8/0.0 | 5 min | TI = 400 ms Reconstructed to 0.9 mm slice width |
SWI | Changes in venous volume | 50.9 | 23.7 | 10 | 240 × 240 | 320 × 288 | 2.0/0.0 | 6 min 41 s | Reconstructed to 1 mm slice width |
T2 3D FSE (cube) | Volume of the cervical spinal cord | 1250 | 92.2 | – | 180 × 180 | 288 × 288 | 2.0/0.0 | 3 min 35 s | Reconstructed to 1 mm slice width |
Sagittal T2 | Assess total cord length | 3406 | 106.3 | – | 440 × 440 | 384 × 288 | 4.0/0.0 | 1 min 56 s | Images combined to produce a single image |
2D phase contrast | Assess flow in the internal carotid arteries | 10.5 | 4.9 | 30 | 160 × 160 | 256 × 224 | 5.0 | 4 min 21 s | 1 slice, 25 phases venc = 120 cm s− 1 |