VisExercises

Exercise 4

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Volume Visualization with VTK

This exercise builds on the previous one and gives an outlook on how to build a complete itk and vtk processing pipeline as an example of a typical visualization cycle.

Exercise (4a)

  • Construct a ITK pipeline as described in NoiseReductionWithITK and place an arbitrary 3D VTK volume visualization module of your choice (e.g. a vtkVolumeRayCastMapper) at the end of the ITK pipeline.
    • Feed the pipeline with the Angio.dcm multi-frame data set.
  • Note: There are two possibilities to use ITK with VTK
    • 1) Start with an ITK example and configure CMAKE with Module_ITKVtkGlue = On
      • Need to rebuild ITK after VTK installation to see the above module option in cmake.
    • 2) Start with a VTK example and configure VTK with the cmake option ITK_DIR = …
  • In case of “generic error: no override found for …”, add the following to your code: 
#define vtkRenderingCore_AUTOINIT 4(vtkInteractionStyle,vtkRenderingFreeType,vtkRenderingFreeTypeOpenGL,vtkRenderingOpenGL)
#define vtkRenderingVolume_AUTOINIT 1(vtkRenderingVolumeOpenGL)
  • Hint: do not forget to use itk::ImageRescaleIntensityFilter and itk::ImageToVTKImageFilter

Exercise (4b)

  • How can we determine the diameter of the main vessel in the visualization?
  • Describe your own ideas for that use case.
  • Discuss pros and cons of other possible solutions like:
    • Determine the diameter manually by counting voxels.
    • Run a itk::BinaryThinningImageFilter filter on the data
    • etc.


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