Table 3.
Image acquisition parameters for participants imaged using nonstandardized clinical imaging
| Site | Manufacturer | Model | Field Strength (T) | Acquisition (mm3) | Voxel Size (ms) | Repetition Time | Echo Time (ms) | Inversion Time (ms) | Flip Angle (°) |
|---|---|---|---|---|---|---|---|---|---|
| Site 1 | Philips | Intera | 1.5 | FFE | 1 × 1 × 1 | 3.8 | 1.7 | n/a | 8 |
| Site 1 | GE | Signa HDxt | 1.5 | GRE | .35 × 1 × .35 | 5.412 | 1.664 | n/a | 30 |
| Site 1 | Siemens | Avanto | 1.5 | MPRAGE | 1.5 × .86 × .86 | 1900 | 3.99 | 950 | 12 |
| Site 1 | Siemens | Avanto | 1.5 | MPRAGE | .86 × .86 × 1 | 2100 | 3.79 | 1100 | 12 |
| Site 1 | Siemens | TrioTrim | 3 | MPRAGE | 1 × 1 × 1 | 1360 | 2.15 | 800 | 15 |
| Site 1 | Siemens | Biograph mMR | 3 | MPRAGE | 1 × 1 × 1 | 2100 | 2.79 | 900 | 8 |
| Site 1 | Siemens | Biograph mMR | 3 | MPRAGE | 1 × 1 × 1 | 2100 | 2.79 | 900 | 8 |
| Site 1 | Philips | Ingenia | 1.5 | FFE | .98 × 1.3 × .98 | 7.1 | 3.328 | n/a | 8 |
| Site 1 | Philips | Intera | 1.5 | FFE | .86 × 1.1 × .86 | 20 | 4.599 | n/a | 15 |
| Site 1 | Philips | Ingenia | 1.5 | FFE | .89 × 1.3 × .89 | 7 | 3.289 | n/a | 8 |
| Site 1 | Siemens | TrioTrim | 3 | MPRAGE | 1 × 1 × 1 | 1360 | 2.15 | 800 | 15 |
| Site 1 | Siemens | TrioTrim | 3 | MPRAGE | 1 × 1 × 1 | 1360 | 2.15 | 800 | 15 |
| Site 1 | Siemens | Skyra | 3 | MPRAGE | .9 × 1 × 1 | 2100 | 3.17 | 900 | 8 |
| Site 1 | Siemens | Biograph mMR | 3 | MPRAGE | 1 × 1 × 1 | 2300 | 2.98 | 900 | 9 |
| Site 1 | GE | Signa HDxt | 1.5 | GRE | 1.2 × 1.9 × 1.9 | 12.364 | 5.072 | 450 | 12 |
| Site 1 | Philips | Achieva | 3 | FFE | 1 × .93 × .93 | 8 | 3.686 | n/a | 8 |
| Site 1 | Siemens | Biograph mMR | 3 | MPRAGE | 1 × 1 × 1 | 1360 | 2.19 | 800 | 15 |
| Site 1 | Siemens | Prisma | 3 | MPRAGE | 1.1 × 1.1 × 1.1 | 2220 | 3.22 | 1100 | 9 |
| Site 1 | Siemens | Aera | 1.5 | MPRAGE | .97 × .97 × .97 | 2300 | 2.27 | 900 | 8 |
| Site 1 | Siemens | Avanto | 1.5 | MPRAGE | 1.1 × 1.1 × 1.1 | 2730 | 3.4 | 1000 | 7 |
| Site 2 | Philips | Ingenia | 3 | FFE | .89 × .83 × .83 | 9 | 4.163 | n/a | 8 |
| Site 2 | Philips | Ingenia | 3 | FFE | .89 × .83 × .83 | 8.5 | 3.873 | n/a | 8 |
| Site 3 | Siemens | Verio | 3 | MPRAGE | .48 × 1.5 × .45 | 1900 | 2.93 | 900 | 9 |
| Site 4 | GE | Signa HDxt | 1.5 | GRE | .51 × .51 × 1 | 14.72 | 6.368 | 450 | 13 |
| Site 5 | GE | Signa HDxt | 1.5 | GRE | .43 × .70 × .43 | 10 | 4.072 | 600 | 13 |
| Site 6 | Philips | Achieva | 1.5 | FFE | 1 × 1 × 1 | 12 | 2.398 | n/a | 20 |
| Site 6 | GE | Signa HDxt | 1.5 | GRE | .47 × .47 × 1.4 | 11.2 | 5.008 | n/a | 12 |
| Site 6 | Philips | Achieva | 1.5 | FFE | .92 × 1.2 × .92 | 12 | 2.399 | n/a | 20 |
| Site 6 | Philips | Achieva | 3 | FFE | .94 × .94 × 1 | 5.5 | 1.503 | n/a | 8 |
| Site 7 | Siemens | TrioTrim | 3 | MPRAGE | .48 × 1 × .48 | 1860 | 2.94 | 1000 | 8 |
| Site 7 | Siemens | TrioTrim | 3 | MPRAGE | .53 × 1.14 × .53 | 1800 | 2.94 | 1000 | 8 |
| Site 7 | Siemens | TrioTrim | 3 | MPRAGE | .48 × 1 × .48 | 1800 | 2.94 | 1000 | 8 |
n/a = not applicable; MPRAGE = magnetization prepared rapid gradient echo; FFE, GRE = gradient echo sequences; GE = General Electric.