[Insight-users] a question about rigid + nonrigid registration

[qing xu]

Hello,

I have a question on how to do a rigid registration followed by a nonrigid 
one. Thank you in advance.

I am currently trying to register two volumes. One volume only contains part 
of the other, so I used the larger volume as fixed image and smaller volume 
as the moving image.  First, I performed a rigid 
registration(VersorRigid3DTransform) and then want to fine tune the 
rigistration by nonrigid method (BSplineDeformableTransform). However, I do 
not know how to initialize the  BSplineDeformableTransform using the 
existing rigid result (VersorRigid3DTransform). Maybe I can use resample 
filter to get a new moving image based on the rigid registration. But the 
resampled moving image has the size of the larger volume, so some voxels do 
not have resampled value and this will cause problems in further nonrigid 
registration. Hope I made my questions clear.

Qing

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