TABLE 2.
3D T1w and FLAIR sequence scan parameters.
| 3D T1 | |||
| Achieva | Ingenia | GE | |
| Sequence | TFE | TFE | BRAVO |
| Coil | 16 channels | 32 channels | 16 channels |
| Field of view (mm3) | 230 × 230 × 172.8 | 230 × 230 × 172.8 | 256 × 256 × 172.8 |
| Phase oversampling | 12% | 12% | / |
| Acq. resolution (mm3) | 1.2 × 1.2 × 1.2 | 1.2 × 1.2 × 1.2 | 1.2 × 1.2 × 1.2 |
| Reco. resolution (mm3) | 0.6 × 0.6 × 0.6 | 0.6 × 0.6 × 0.6 | 1 × 1 × 0.6 |
| Slice orientation | Sagittal | Sagittal | Sagittal |
| TE (ms) | 4.6 | 2.8 | 2.8 |
| TR (ms) | 8.5 | 7.6 | 7.6 |
| TI (ms) | 888 | 800 | 800 |
| Bandwidth (Hz/pixel) | 217.6 | 309.6 | 294.8 |
| TFE factor / ETL | 144 | 144 | / |
| Flip angle | 8° | 8° | 8° |
| Acceleration technique | Compressed sense | Compressed sense | SENSE |
| Acceleration factor | 2 | 2 | 2 × 1 |
| Scan time | 2 min 34 s | 2 min 44 s | 3 min 45 s |
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FLAIR
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| Achieva | Ingenia | GE | |
|
| |||
| Sequence | TSE | TSE | CUBE |
| Coil | 16 channels | 32 channels | 16 channels |
| Field of view (mm3) | 230 × 230 × 172.8 | 230 × 230 × 172.8 | 256 × 256 × 172.8 |
| Phase oversampling | 12% | 12% | / |
| Acq. resolution (mm3) | 1.2 × 1.2 × 1.2 | 1.2 × 1.2 × 1.2 | 1.2 × 1.2 × 1.2 |
| Reco. resolution (mm3) | 0.6 × 0.6 × 0.6 | 0.6 × 0.6 × 0.6 | 1 × 1 × 0.6 |
| Slice orientation | Sagittal | Sagittal | Sagittal |
| TE (ms) | 154 | 155 | 126 |
| TR (ms) | 4,800 | 5,000 | 5,000 |
| TI (ms) | 1,650 | 1,650 | 1,466 |
| bandwidth (Hz/pixel) | 440 | 867.1 | 589.6 |
| TFE factor / ETL | 230 | 230 | 230 |
| Acceleration technique | Compressed sense | Compressed sense | SENSE |
| Acceleration factor | 4 | 4 | 2 × 2 |
| Scan time | 4 min 20 s | 4 min 35 s | 3 min 3 s |
Reconstruction parameters were kept similar where possible, with voxel interpolation not exceeding a factor of 2 in any dimension. Achieva: Philips Medical Systems Achieva dStream 1.5T. Ingenia: Philips Medical Systems Ingenia 3T. GE: GE Discovery MR750w 3T.