Table 1.
Hardware information and imaging parameters for data collection
| a) MR systems and RF coils | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Site 1 | Site 2 | Site 3 | Site 4 | |||||||
| MR system | Siemens Prisma | Siemens Prisma | GE Discovery™ MR750 wide bore | Philips Ingenia wide bore | ||||||
| Software | VE11C | VE11C | DV25R2 | 5.3.1 | ||||||
| RF coil | QED 1 Tx/15Rx knee coil | QED 1Tx/15Rx knee coil | Invivo 1Tx/8Rx knee coil | Invivo 1Tx/16Rx coil | ||||||
| b) T1ρ and T2 imaging | ||||||||||
| Phantom | Volunteer | |||||||||
| FOV | 140×140×80 mm3 | 140×140×96 mm3 | ||||||||
| Imaging matrix | 256×128×20 | 320×160×24 | ||||||||
| Image orientation | Transversal | Sagittal | ||||||||
| Time of recovery | 1.5 seconds | |||||||||
| Number of echoes | 8 | |||||||||
| Bandwidth per pixel (Hz) | 400 Hz | |||||||||
| Views per segment | 76 (Site 1, 3, 4) 128 (Site 2) |
92 (Site 1, 3, 4) 160 (Site 2) |
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| Parallel imaging | Factor 2 (Site 1, 3, 4) None (Site 2) |
Factor 2 (Site 1, 3) Factor 1.6×1.6 (Site 4) None (Site 2) |
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| Time of Spin-Lock (TSL) | 0, 10, 20, 30, 40, 50, 60, 70 ms | |||||||||
| Spin-Lock Frequency | 500 Hz | |||||||||
| T2 preparation TE | 0, 9.7, 21.3, 32.9, 44.5, 56.1, 67.6, 79.2 ms (Site 1) 5, 10, 20, 30, 40, 50, 60, 70 ms (Site 2) 0, 8.8, 17.7, 26.5, 35.4, 44.2, 53.1, 61.9 ms (Site 3) 0, 6.83, 15.3, 23.7, 32.1, 40.6, 49.0, 57.4 ms (Site 4) |
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| Acquisition time | 10:40 (Site 1) 6:24 (Site 2) 10:41 (Site 3) 9:04 (Site 4) |
13:43 (Site 1) 7:48 (Site 2) 14:42(Site 3) 9:11 (Site 4) |
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| c) List of scan parameters used to evaluate scan parameter dependency | ||||||||||
| T1ρ imaging | Combinations of time of recovery (0.8, 1.5, and 3 seconds), views per segment (64 and 128), with and without parallel imaging | |||||||||
| T2 imaging | TE_set1 = [1.86 8.59 17.18 25.78 34.37 42.96 51.55 60.14] ms TE_set2 = [1.86 9.99 19.98 29.98 39.97 49.96 59.95 69.94] ms TE_set3 = [1.86 11.59 23.18 34.78 46.37 57.96 69.55 81.14] ms | |||||||||
| d) High-resolution gradient echo imaging | ||||||||||
| Site 1 (DESS) | Site 2 (DESS) | Site 3 (SPGR) | Site 4 (FFE) | |||||||
| FOV (mm3) | 140×140×112 | 140×140×112 | 140×140×114 | 140×140×112 | ||||||
| Imaging matrix | 384×307×160 | 256×238×160 | 384×300×114 | 388×310×160 | ||||||
| TR (ms) | 17.55 | 17.55 | 13.036 | 18 | ||||||
| TE (ms) | 6.02 | 6.02 | 2.716 | 6.5 | ||||||
| Flip angle (°) | 25 | 25 | 25 | 25 | ||||||
| Bandwidth per pixel (Hz) | 185 | 240 | 139 | 185 | ||||||