Table 1 Values of main registration components following parameters tuning for affine and non-rigid registration
From: SCreg: a registration-based platform to compare unicondylar knee arthroplasty SPECT/CT scans
Main parameters | Affine registration | Non-rigid registration |
|---|---|---|
Pyramids | Smoothing anisotropic gaussian | Smoothing anisotropic gaussian |
Number of resolutions | 3 | 4 |
Smoothing factors | 442,221,111 | 884, 442, 221, 111 |
Metrics | Normalized mutual information | Non-normalized mutual information |
Number of histogram bins | 16 | 32 |
Transforms | Affine | B-Splines |
Control grid spacing | Not applicable | (32; 32; 16) voxels |
Multiplication factors | Not applicable | 884 442,221,111 |
Optimizers | Adaptive stochastic gradient descent | Adaptive stochastic gradient descent |
Maximal number of iterations | 2000 | 500 |
Samplers | Random | Random |
Number of points | 2000 | 2000 |
Interpolators | Nearest neighbor | Linear |
Final interpolators | Linear | 3rd-degree B-splines |