Table 1.
Scan Parameters
| Survey | T1‐weighted Dixon | T1 map | |
|---|---|---|---|
| Sequence | 2D balanced GE | 3D dual echo GE with Dixon reconstruction of water only images | Inversion recovery with 2D multislice GE readout |
| Fast imaging | NA | NA | EPI |
| Inversion pulse | NA | NA | Hyperbolic secant |
| Inversion times (msec) | NA | NA | 55; 253; 451; 649; 847; 1045; 1243; 1441; 1639; 1837; 2035a |
| TE (msec) | 1.4 | 3.5; 4.6 | 22 |
| TR (msec) | 2.8 | 7.5 | 6500 |
| Flip angle (degrees) | 25 | 8 | 90 |
| Orientation | Coronal | Coronal oblique | Coronal oblique |
| Slices | 10 | 35 | 11a |
| Voxel size (mm) | 2x1.56x10 | 1.5x1.5x3 | 3x3x6 |
| FOV (mm) | 450x450x145 | 320x400x70 | 244x244x76 |
| Slice gap (mm) | 5 | 0 | 1 |
| Acquisition time (sec) | 31 | 19 | 72 |
a
The first four subjects were scanned with seven slices and seven inversion times (105; 373; 641; 909; 1177; 1445; 1713 msec).
GE: gradient echo; EPI: echo planar imaging; TE: echo time; TR: repetition time; NA: not applicable.