[Insight-users] Demons deformable Registration: initialization and RoI

[Luis Ibanez]

Hi Jan,

You can initialize Demons with a deformation field of your choice.

If you compute the initial displacement vectors using an
AffineTransform then your initial displacement field will be
equivalent to such transform.

Please look at the method:


     demons->SetInitialDeformationField();





    Regards,


        Luis


----------------------
Jan Schreiber wrote:

> Hi all, 
> 
> I have two questions on demons deformable registration:
> 
> 1. Initialization from non-deformable pre-registration
> Before performing the deformable registration, I am using a similarity transform to pre-align the images. Now I want to use the result from the pre-registration with my deformable registration. 
> a) is there a simple way to do this?
> b) does it make sense to compute a deformation field fom the similatity transform and use this as initial deformation field, is this supported by itk
> c) should I just resample the image with the similarity transform and use the "new" image?
> 
> 2. Setting a region of interest for the deformable registration
> a) Is it possible to set a region of Interest to the deformable registration to not register the whole image?
> b) If not and I have to extract a region and create a new image from that - is it (easily) possible to re-integrate that region to the original (large) image?
> 
> Thanks in advance, 
> Jan
> 
> 
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