[Insight-users] Question about generating and composing deformationfields

[Francois Budin]

Hi Anja,

Another solution could be to use a class that is described in this
insight journal paper: http://hdl.handle.net/10380/3189
The class is called itkTransformDeformationFieldFilter and allows you
to combine any transform with a deformation field.
Sincerely,

Francois

On Fri, Aug 27, 2010 at 03:23,  <M.Staring at lumc.nl> wrote:
> Hi Anja,
>
> I think you need two things:
>
> 1) A transform that combines multiple sub-transforms
> 2) The TransformToDeformationFieldSource in the Review directory to
> compute the deformation field from the composed transform.
>
> For the first point you can use the CombinationTransform classes
> distributed with elastix (http://elastix.isi.uu.nl) also described in
> the Insight Journal (http://hdl.handle.net/1926/197). You can choose to
> use addition or composition with the functions SetUseComposition() or
> SetUseAddition(). Checkout the elastix manual for the difference between
> adding and composing, and what is advisible.
>
> Hope this helps,
>
> Marius
>
>>
>> Hello everyone,
>>
>> I have a series of affine and non-rigid transformations and
>> what I would like to do is create one single deformation
>> field by combining these deformations and then use this final
>> deformation field to resample my image.
>>
>> So I need to do two different compositions (I am not sure if
>> I should compose or add these deformation fields. The
>> formulation of composition is not completely clear to me as well).
>>
>> 1: I have an affine transformation and a non-rigid
>> transformation. So, given an initial image, how can I create
>> a deformation field that encapsulates these two transformations.
>> 2: I have a non-rigid transformation followed by an affine
>> transformation. Again, I would like to create a deformation
>> field that encapsulates them.
>>
>> I would be very grateful if anyone could point out how I
>> might achieve this in ITK. Also, maybe more experienced
>> people doing medical image registration could share some
>> information on how deformation foelds are combined (addition
>> vs composition)
>>
>> Many thanks for any help you can give me,
>>
>> Anja
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