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Effects of image registration. Unregistered pre-CT (in purple color) overlapped to CBCT (in green color) (first row) compared to registered pre-CT overlapped to CBCT (second row) for three representative slices of patient #1. The comparison shows that the substantial misalignment occurring before registration (manifest as a purple shadow) was almost completely eliminated using our new fusion method despite the technical differences between the two different imaging modalities
