[Insight-users] Problems with SetFixedImageMask, MattesMI, BSpline Transfo. and RegularStepGradientDescentOptimizer

[Luis Ibanez]

Hi Serena,


Instead of :

 spatialObjectMask->SetImage( maskReader->GetOutput() );

metric->SetFixedImageMask( spatialObjectMask);


You should do:

        maskReader->Update();

 spatialObjectMask->SetImage( maskReader->GetOutput() );

metric->SetFixedImageMask( spatialObjectMask);



     Regards,


            Luis


-----------------------------------------------------------
On Wed, Jun 9, 2010 at 11:39 AM, sere f <serenaf33 at gmail.com> wrote:

> Hi All,
> I am registering CT and MRI of the brain with Bspline Transformation,
> Mattes-MI, RegularStepGradientDescentOptimizer.
> The registration works fine.
>
> But when I set:
>
>  spatialObjectMask->SetImage( maskReader->GetOutput() );
>
> metric->SetFixedImageMask( spatialObjectMask);
>
> The Registration ends with 0 iteration and I get this message:
>
> Optimizer stop condition = RegularStepGradientDescentOptimizer: Gradient
> magnitude tolerance met after 0 iterations. Gradient magnitude (0) is less
> than gradient magnitude tolerance (0.001).
>
> My mask is a binary image (0,255). Is it wrong?
> How can I register using a mask for Fixed Image?
> any idea?
>
> Thank you very much.
>
> Serena.
>
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