[Insight-users] Exceptions with Deformable BSpline registration.

[Luis Ibanez]

Hi John,

This error message indicates that under the current Transform,
the two images don't have a a significant overlapping region.

This may be the result of poor initialization, or the result
of an optimizer set to take strides that are too large.

Setting the CMake flag to

     ITK_USE_ORIENTED_IMAGE_DIRECTION=ON

is the right thing to do.

Do you get this exception error at the very beggining of the
registration process ?

or do you get the error message after running the optimzer
for several iterations ?

Could you please do the following ?

In any of the examples that you are trying, please add the
following code:


     fixedImageReader->Update();
     movingImageReeader->Update();
     fixedImageReader->GetOutput()->Print();
     movingImageReader->GetOutput()->Print();

This will help us see what is the initial overlap
between the images. Please post to the list the entire
output. We will be particularly interested in Origin,
Spacing and Direction of both the Moving and Fixed images.



Also,

Could you please post to the list the output log of
DeformableRegistration15 ?

This is the example that perfoms Rigid, then Affine, and
then a BSpline deformable registration with two levels
of resolution in the BSpline grid.


    Thanks


       Luis


---------------------------
johnjtchen at aol.co.uk wrote:
> Dear All,
> 
> I have some problems with running BSpline with Mattes MI metric
> registration from example\registration directory.
> 
> No matter how I try the various conbination of the paramters of
> LBFGSB or RegularStepGradient optimizer, the results that I can
> get are "Joint PDF summed to zero" with gradient optimizer or
> "Too many samples are mapping outside image" with LBFGSB.
> 
> The images for registration are T1 256*256*92 brains. I am sure
> that the origin of fix and mov images are both [0,0,0], and the
> images have been rigidly aligned.
> 
> I am windering is that the effects with regarding to the CMake
> option "ITK_USE_ORIENTED_IMAGE_DIRECTION=ON"? Because
> now the itkMattesMutualInformationImageMetric has been redirect
> to itkOptMattesMutualInformationImageMetric.
> 
> The examples that I try were Deformable8, 12, 13 and 15. It all gave
> me the exceptions that mentioned above.
> 
> Could you give some advice on this problem?
> 
> Thanks very much.
> john
> 
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