Table 1.
Default values and ranges for synthetic dataset parameters.
| Parameter | Fixed value/Range |
|---|---|
| Vein position relative to voxel center (in 2 transverse axes) | [−0.5, 0.5]* voxels |
| Vein radius (“apparent vein radius” in final image) | 1.3 voxels |
| Vein radius (input vein radius prior to truncation) | 8 voxels |
| Vein orientation relative to image plane (Θ) | [−45°, 45°]* |
| Vein orientation relative to image x-axis (ϕ) | [0°, 45°]* |
| Magnetic susceptibility contrast (χvein−χbackground) | 0.30 ppm |
| Field strength | 7 tesla |
| Transverse decay constant for vein (Deistung et al., 2008) | 7.4 ms |
| Transverse decay constant for background (Deistung et al., 2008) | 33.2 ms |
| Longitudinal decay constant for vein (Deistung et al., 2008) | 2,587 ms |
| Longitudinal decay constant for background (Deistung et al., 2008) | 2,132 ms |
| Proton density for vein (Deistung et al., 2008) | 0.90 |
| Proton density for background (Deistung et al., 2008) | 0.77 |
| Repetition time (TR) | 25 ms |
| Echo time (TE) | 7.65 ms |
| Gaussian noise (standard deviation, std. noise) | 0.1 |
Ranges (*) were sampled randomly with a uniform distribution for all synthetic datasets.