Table 1.
Knee MR acquisition parameters of sequences assessed for our study according to the OAI study protocol (adapted from Peterfy CG et al.[29]). Coil: quadrature transmit-receive coil (USA Instruments, Aurora, OH)
| Scan | COR IW 2D TSE | SAG 3D DESS WE1 | COR T1W 3D FLASH WE | SAG IW 2D TSE FS2 |
|---|---|---|---|---|
| Plane | Coronal | Sagittal | Coronal | Sagittal |
| Fat suppression | No | WE | WE | FS |
| Matrix (phase/frequency) | 307/384 | 307/384 | 512/512 | 313/448 |
| No. of slices | 35 | 160 | 80 | 37 |
| FOV (mm) | 140 | 140 | 160 | 160 |
| Slice thickness/ gap (mm) | 3/0 | 0.7/0 | 1.5/0 | 3/0 |
| Flip angle (°) | 180 | 25 | 12 | 180 |
| TE/TR (ms) | 29/3700 | 4.7/16.3 | 7.57/20 | 30/3200 |
| Bandwidth (Hz/pixel) | 352 | 185 | 130 | 248 |
| No. of excitations (averaged) | 1 | 1 | 1 | 1 |
| Echo-train length | 7 | 1 | 1 | 5 |
| Acquisition time (min) | 3.4 | 10.6 | 8.6 | 4.7 |
COR = coronal; DESS = dual-echo in steady state; FLASH = fast low-angle shot; FS = fat suppression; TSE = turbo spin-echo; FOV = field of view; IW = intermediate-weighted; SAG = sagittal; TE = echo time; TR = repetition time; WE = water excitation.
1
also used for axial and coronal multi-planar reformations (MPR); slice thickness, 1.5mm each.
2
used for the assessment of SPFP imaging characteristics.