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The mean mutual information between the planning CTs and daily CBCTs before registration, after B-splines deformable registration, and after multiscale registration.
| Mutual information | Rectum | Prostate | Head-neck |
|---|---|---|---|
| Before registration | 0.34 | 0.21 | 0.20 |
| After B-splines registration | 0.75 | 0.64 | 0.74 |
| After multiscale registration | 0.79 | 0.65 | 0.76 |
