Registration notebook "missing features"

[AnderBiguri]

Just writing up somewhere what I feel is missing from the registration notebook. (this is just here to have it somewhere written for the fully3d training school prep)

Registration

Currently, while quite detailed exercise, it only has rigid transformation.
It has a comment that says # Set to NiftyF3dSym for non-rigid, but I fear that may not be enough as a "tutorial" if that is what we are looking for. Particularly set_parameters() is quite different (and not documented) and can be very important on non-rigid recon. We should add either a list of parameters to set, or an instruction to tell the user to know where to find them (I think they are only available reading the source, as they have other names that the f3d docs).

Perhaps adding (as commented in a meeting) non-rigid registration with tuning parameters to see the effect on the result is a good idea.

The demo also misses the different ways you can obtain displacement/deformation fields and differences among these two.

Resampling

Not much to say, but if we are teaching image recon in general we may be interested in clarifying/explaining

• Interpolation types available (its there) and why to use some (e.g. don't use anything higher than order 1 because it will give you negative values)
• Resampling without transforms: get one image from one domain to another one (equivalent to zoom_image in function, more or less).

[KrisThielemans]

Resampling without transforms: get one image from one domain to another one (equivalent to zoom_image in function, more or less).

addressed in the Geometry notebooks