T1-weighted image parameters from the six study sites
Site | Manufacturer | Field strength, T | Image dimensions, mm | Slice thickness, mm | TR, ms | TE, ms | Flip angle , deg |
---|---|---|---|---|---|---|---|
1 | Siemens | 1.5 | 256 × 256×200 | 0.80† | 25.00 | 4.60 | 30‡ |
2 | GE | 3.0 | 256 × 256×124 | 1.20 | 9.00 | 2.00 | 15 |
3 | Siemens | 3.0 | 240 × 256×176 | 0.90 | 2250* | 3.96 | 9 |
4 | Siemens | 3.0 | 128 × 256×256 | 1.33 | 6.00 | 2.90 | 8 |
5 | Siemens | 3.0 | 256 × 256×160 | 1.00 | 1600^ | 3.37 | 15 |
6 | Philips | 3.0 | 256 × 256×100 | 1.00 | 9.88 | 4.59 | 8 |
†0.8 mm gap.
‡Five of 66 cases had TR= 30 and flip angle=35. Note that the long TRs for Sites 3 and 5 were due to the use of inversion recovery.
*Inversion time = 900.
^Inversion time = 640.