I have to register two MRIs that represent the same patient (who is always in the same position). Note that one image is larger than the other as it represents a larger portion of the body.
I roto-translated the larger image in order to obtain an “initial manual registration” and everything is fine until this point.
Then, I applied the General Registration (BRAINS) to refine the initial registration. The results is a cropped image: the larger image is cropped to the same size as the smaller one. This is undesired since I would need the extra portion of the body originally provided by my larger image.