[Insight-users] modify transformation parameters by using itkBSplineDeformableTransform

[Xi Liang]

Dear all,

I want to change the some control point parameters got by running
registration by using itkBSplineDeformableTransform.h. The reason is to
manually modify a set of control points such that only translation is
applied on the corresponding regions. The question I would like to ask is
whether this should be done manually, or we have a filter to change those
parameters?

If I have to do this manually, I will have to understand of the format of
parameters. I understand the number of parameters get
from itkBSplineDeformableTransform is ImageDimension *
(numberOfGridNodesInOneDimension + BsplineOrder). Which value is for
lower/upper borders, and which are for nodes? I think I will only need to
modify the node values to enforce the translation transformations.

This method is introduced by Tanner in Volume and Shape Preservation of
Enhancing Lesions when applying nonrigid registration to a time series of
contrast enhancing MR breast Images. It couples the control points of a
bspline deformation to enforce rigidity on certain structures.

Kind regards,

Xi
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