[Insight-users] MultiResMiRegistration with itkVersorRigid3DTransform

[Luis Ibanez]

Hi Angel,

Yes, we have use a similar setup for registering

PET to CT and MR to CT volumes.

Note that there are *MANY* parameters that you should
fine tune in order to adapt the registration to the
characteristics of your particular images.

It is very important that you fine tune parameters
one resolution-level at a time, starting of course
with the coarsest one.


You must pay attention to the origin and spacing of
both images. To the scaling factors for the transform
parameters, to the learning rate of the optimizer and
to the parameters of the Mutual Information metric.

You must also check if you are using a reasonable center
of rotation for the transform.



    Regards,


       Luis



-------------------------
José Ángel Tavira wrote:

>  
> 
> Hi everyone
>  
> I am using the MultiResMiRegistration framework in order to registrate 2 
> medical studies (a CT study and a MR study).
>  
> The InsightApplications software offers an application using these 
> components:
>  
>  /* In particular, it uses the ITK registration framework with
>  *  the following combination of components:
> 
>  *   - MutualInformationImageToImageMetric
>  *   - QuaternionRigidTransform
>  *   - QuaternionRigidTransformGradientDescentOptimizer
>  *   - LinearInterpolateImageFunction
> */
>  
> As this combination did not lead me to successfull results, then I have 
> replaced the following components:
>  
>  *   - QuaternionRigidTransform
>  *   - QuaternionRigidTransformGradientDescentOptimizer
> with the next ones:
>  
>  *   - itkVersorRigid3DTransform
>  *   - itkVersorRigid3DTransformOptimizer
>  
> but the results still remain very inexact, whichever value I assign to 
> the itkVersorRigid3DTransformOptimizer configuration parameters. So, my 
> question is:
>  
>  
> Has anybody been able to registrate 2 medical studies (CT and MR) with 
> this set of components?
>  
>  
> Thank you very much in advance for your attention.
>  
>  
> José Ángel.
> 
>  
> 
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