[Insight-users] 3d FEM registration

[Stephen Yip]

All 2D registration example work perfectly fine. Problems seem to arise in
3D.

1. Am I using the prohibited file type (hdr)? I google that a little. hdr
seems to be acceptable for ITK.
2. What about the data type? float, byte, etc. ? I think I'd tried several
different data types but none of them worked well.
3. Should I restrict the intensity level images to a certain range (e.g. 1
to 225)? I did try but I still got the same error.

I can't think of any other possibilities. Could anyone give me some help?

Thank you,
stephen

P.S. In case you found my previous message confusing. I've modified that
below.



> I am using DeformableRegsitration11.cxx to compute 3D image registration.
> Does anyone know how I may fix the problem?
>
> I keep getting the error message:
> Reading config file...A3.txt
> Example configured. E 3 rho 3
>  reading moving
>  reading fixed
> Exception caught during reference file reading
>
>
> itk::ImageFileReaderException (015BF9CC)
> Location: "void __thiscall itk::ImageFileReader<class itk::Image<unsigned
> char,3>,class itk::DefaultConvertPixelTraits<unsigned char>
> >::GenerateOutputInformation(void)"
> File: c:\itk\src\code\io\itkImageFileReader.txx
> Line: 100
> Description: FileName must be specified
>
> Below is what I have in my parameter file.
>
> % Parameters for the single- or multi-resolution techniques
> % ---------------------------------------------------------
> 1    % Number of levels in the multi-res pyramid (1 = single-res)
> 1    % Highest level to use in the pyramid
> 1 1 1       % Scaling at lowest level of pyramid
> 3 3 3        % Number of pixels per element
> 1.e4 1.e4 1.e4         % Elasticity (E)
> 1.e5 1.e5 1.e5     % Density x capacity (RhoC)
> 1    % Image energy scaling (gamma) - sets gradient step size  3 3 3    %
> NumberOfIntegrationPoints
> 3    % WidthOfMetricRegion
> 30   % MaximumIterations
>
> % -------------------------------
> % Parameters for the registration
> % -------------------------------
> 0 0.99  % Similarity metric (0=mean sq, 1 = ncc, 2=pattern int, 3=MI,
> 5=demons)
> 1.0    % Alpha
> 0    % DescentDirection (1 = max, 0 = min)
> 0    % DoLineSearch (0=never, 1=always, 2=if needed)
> 1.e1    % TimeStep
> 0.5     % Landmark variance
> 0       % Employ regridding / enforce diffeomorphism ( >= 1 -> true)
> % ----------------------------------
> % Information about the image inputs
> % ----------------------------------
> 101 % Nx (image x dimension)
> 101    % Ny (image y dimension)
> 30     % Nz (image z dimension - not used if 2D)
> G:\ITK_test\deform11\deform11\Debug\A.hdr  % ReferenceFileName
> G:\ITK_test\deform11\deform11\Debug\B.hdr  % TargetFileName
> % -------------------------------------------------------------------
> % The actions below depend on the values of the flags preceding them.
> % For example, to write out the displacement fields, you have to set
> % the value of WriteDisplacementField to 1.
> % -------------------------------------------------------------------
> 0    % UseLandmarks? - read the file name below if this is true
> -    % LandmarkFileName
> G:\ITK_test\deform11\deform11\Debug\D                      %
> ResultsFileName (prefix only)
> 1       % WriteDisplacementField?
> G:\ITK_test\deform11\deform11\Debug\D                        %
> DisplacementsFileName (prefix only)
> 0       % ReadMeshFile?
> -                                      % MeshFileName
> END
>
>
>
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