Results of Back-and-Forth Interpolation in 3 Dimensions
| Interpolation step size in each of 3 directions (x,y,z) (mm) | GM/WM | Mutual information | XC |
| 0 (ideal value) | 1.988 | 0.852 | 1.0000 |
| 0.01 | 1.983 | 0.834 | 1.0000 |
| 0.05 | 1.962 | 0.799 | 1.0000 |
| 0.1 | 1.939 | 0.776 | 1.0000 |
| 0.2 | 1.900 | 0.744 | 0.9999 |
| 0.3 | 1.872 | 0.723 | 0.9999 |
| 0.5 | 1.840 | 0.702 | 0.9998 |
| 0.609375 (voxel size/2) | 1.836 | 0.699 | 0.9998 |
| 0.7 | 1.839 | 0.701 | 0.9998 |
| 1.0 | 1.894 | 0.740 | 0.9999 |
| 1.11875 (voxel size − 0.1) | 1.939 | 0.776 | 1.0000 |