Table 2.
Parameters used in this study for rigid registration (RR) and B-Spline non-rigid registration methods implemented in 3D Slicer.
| Parameter | Value | Description | |
|---|---|---|---|
| RR | B-spline | ||
| Cost metric | MMI | MMI | Mattes mutual information |
| Interpolation mode | Linear | Linear | |
| Sampling percentage | 5% | 5% | Percentage of image voxels sampled for MMI |
| Histogram bins | 100 | 100 | Number of histogram levels |
| Optimizer type | VR3DT | LBFGSB | – |
| Max number of iterations | 1,500 | 1,500 | Maximum number of iterations for optimizer |
| Grid size | – | 15 × 15 × 15 | Number of subdivisions of the B-Spline Grid |
| Min step length | 10−3 | 10−3 | Min threshold step for optimizer |
| Projected gradient tolerance | - | 10−5 | Used by LBFGSB |
MMI, Mattes Mutual Information; VR3DT, Versor Rigid 3D Transform; LBFGSB, Limited memory Broyden Fletcher Goldfarb Shannon minimization with Simple Bounds.