Table I.
Main hardware characteristics, acquisition parameters of structural MRI sequences, and averagesignal‐to‐noise ratio (SNR) from the left primary sensorimotor cortex (SMC) in the different centers participating into the study
| Scanner | Coil | Dual/T2‐weighted sequence | FLAIR sequence | 3D T1‐weighted sequence | Average SNR (SD) | |
|---|---|---|---|---|---|---|
| Center 1 | Siemens Sonata | Circular polarized head coil | TR = 2800 TE = 94 slices = 19 thickness = 3 FOV = 250 matrix = (205)2 | TR = 9000 TE = 105 TI = 2200 slices = 17 thickness = 5 FOV = 250 | TR = 2700 TE = 4 slices = 160thickness = 1.5 FOV = 260orientation = axial | 190.3 (22.3) |
| Center 2 | Siemens Symphony Maestro Class | Quadrature whole head coil | TR = 3500 TE = 14/86slices = 23 thickness = 5 FOV = 256 matrix = (256)2 | TR = 9000 TE = 114 TI = 2500 slices = 23 thickness = 5 FOV = 250 | TR = 2050 TE = 3.93 slices = 144 thickness = 1 FOV = 256 orientation = sagittal | 230.8 (14.5) |
| Center 3 | Siemens Sonata | Circular polarized head coil | TR = 3230 TE = 84 slices = 21 thickness = 5 FOV = 240 matrix = (512)2 | TR = 9000 TE = 108 TI=2400 slices = 21 thickness = 5 FOV = 240 | TR = 1800 TE = 4.38 slices = 144 thickness = 1 FOV = 240 orientation = axial | 301.5 (20.6) |
| Center 4 | Philips Intera | Circular polarized head coil | TR = 2300 TE = 80 slices = 24 thickness = 5.5 FOV = 230 Matrix = (256)2 | TR = 8000 TE = 110 TI = 2100 slices = 24 thickness = 5 FOV = 230 mm | TR = 20 TE = 4 slices = 126 thickness = 1FOV = 256 orientation = axial | 356.5 (18.2) |
| Center 5 | GE Signa Excite 11.0 | Birdcage head coil | TR = 5900 TE = 102 slices = 22 thickness = 5 FOV = 240 matrix = (512)2 | TR = 9895 TE = 140 TI = 2473 slices = 22 thickness = 5 FOV = 240 matrix = (256)2 | TR = 20 TE = 2.3 slices = 146thickness = 1.5 FOV = 260 orientation = coronal | 300.8 (19.3) |
| Center 6 | Siemens Vision | Quadrature whole head coil | TR = 3300 TE = 16/98 slices = 24 thickness = 5 FOV = 250 matrix = (256)2 | NA | TR = 11.4 TE = 4.4 slices = 160 thickness = 1 FOV = 250 orientation = sagittal | 79.1 (9.4) |
| Center 7 | Siemens Sonata | Circular polarized head coil | TR = 5000 TE = 90 slices = 25thickness = 6 FOV = 250 matrix = (256)2 | TR = 10000 TE = 139 TI = 2400 slices = 25 thickness = 6 FOV = 250 | NA | 337.8 (24.3) |
| Center 8 | Philips Gyroscan ACS‐NT15 | Standard head coil | TR = 2074 TE = 34 slices = 50 thickness = 3 FOV = 250 matrix = (256)2 | TR = 9000 TE = 150 TI = 2725 slices = 50 thickness = 3 FOV = 250 | TR = 20 TE = 3 slices = 50 thickness = 3 FOV = 250 orientation = axial | 267.5 (10.2) |
TR, TE, and TI are expressed in ms, slice thickness and FOV are expressed in mm, SNR is a dimensionless index.
TR, repetition time; TE, echo time; TI, inversion time; FOV, field of view; SNR, signal‐to‐noise ratio; NA, not acquired.