Table II.
Final OAI knee MRI protocol acquisition parameters
| Scan | Localizer | COR IW 2D TSE | SAG 3D DESS WE | COR T1W 3D FLASH WE | SAG 2D MESE | SAG IW 2D TSE FS |
|---|---|---|---|---|---|---|
| Plane | 3-plane | Coronal | Sagittal | Coronal | Sagittal | Sagittal |
| FS | No | No | WE | WE | No | FS |
| Matrix (phase) | 128 | 307 | 307 | 512 | 269 | 313 |
| Matrix (frequency) | 256 | 384 | 384 | 512 | 384 | 448 |
| No. of slices | 21 | 35 | 160 | 80 | 21 | 37 |
| FOV (mm) | 200 | 140 | 140 | 160 | 120 | 160 |
| Slice thickness/gap (mm/mm) | 5/1 | 3/0 | 0.7/0 | 1.5/0 | 3/0.5 | 3/0 |
| Flip angle (°) | 40 | 180 | 25 | 12 | n/a | 180 |
| TE/TR (ms/ms) | 5/10 | 29/3700 | 4.7/16.3 | 7.57/20 | 10, 20, 30, 40, 50, 60, 70/2700 | 30/3200 |
| Bandwidth (Hz/pixel) | 250 | 352 | 185 | 130 | 250 | 248 |
| Chemical shift (pixels) | 1.8 | 1.3 | 0 | 0 | 1.8 | 0 |
| No. excitations averaged | 1 | 1 | 1 | 1 | 1 | 1 |
| ETL | 1 | 7 | 1 | 1 | 1 | 5 |
| Phase encode axis | A/P, R/L | R/L | A/P | R/L | A/P | A/P |
| Distance factor (%) | 50 | 0 | 0 | 0 | 16 | 0 |
| Phase oversampling | 0 | 20 | 0 | 0 | 0 | 40 |
| Slice oversampling | 0 | 0 | 10 | 0 | 0 | 0 |
| Phase resolution | 50 | 80 | 80 | 100 | 70 | 70 |
| Phase partial Fourier (8/8 = 1) | 1 | 1 | 1 | 1 | 0.875 | 1 |
| Readout partial Fourier (8/8 = 1) | 1 | 1 | 1 | 1 | 1 | 1 |
| Slice partial Fourier (8/8 = 1) | 1 | 1 | 0.75 | 0.75 | 0.75 | 1 |
| X-resolution (mm) | 0.391 | 0.365 | 0.365 | 0.313 | 0.313 | 0.357 |
| Y-resolution (mm) | 0.781 | 0.456 | 0.456 | 0.313 | 0.446 | 0.511 |