[ITK] [ITK-users] Compose Displacement Field Order using Syn regsitration

[Emma Saunders]

Hi everyone

I have a moving image sequence with a reference  or fixed image called
Im_fixed.

 I have used Syn registration on multiple moving images and therefore have
a sequence of forward (takes fixed to moving) and backward (takes moving to
fixed) displacement fields.

Assuming I perform an affine registration of Im_fixed to a separate image
called Im_seperate, not contained within the sequence, how can I then
proceed to put the Syn registrations into the reference frame of
Im_seperate such that the forward and backward fields move Im_seperate with
the same motion as the moving image sequence

I am  using  the Compose Displacement Field Image filter but not clear on
the order of composition.

What is the warping field and how does this differ from the displacement
field? Would using the inverse of the affine with the forward displacement
fields give me fields that move Im_separate in the manner desired?  If so
which order do I compose them in?

Thanks

Emma

  typedef itk::ComposeDisplacementFieldsImageFilter<DisplacementFieldType,
   DisplacementFieldType> ComposerType;
   ComposerType::Pointer composer = ComposerType::New();

  composer->SetDisplacementField( inputfield1);
  composer->SetWarpingField( inputfield2);
  composer->Update();
  combinedfield=composer->GetOutput();
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