2015 Winter Project Week:SlicerMicroMacroScale

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  Projects List

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  CTK example showing seed widget scaling between slice view and three dimensional view.

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  Slicer example with 2d fiducial manager scaling set to 1.0 instead of 0.003

Key Investigators

• Nicole Aucoin (BWH)
• Bradley Lowekamp (Medical Science Computing)
• Jim Miller (GE)

Project Description

Objective

• Fix bugs exposed by using small and large scale images

Approach, Plan

• List of related bugs:
  • Fiducials disappear with large image spacing
  • Setting the unit to microns doesn't help
  • landmark size in 3D view not consistant with 2D views
• Sample data sets
  • Small - link out of date, need new sample from Murat
  • Large - 1005x1004x296 with spacing of 3x3x3.

Progress

• Investigating the base scaling assumptions for vtkSeedWidgets in 3d ctkVTKRenderView vs 2d ctkVTKSliceView
  • writing a pure CTK test case - it shows that in the default set up for the two kinds of views and mirrored seed widgets the seeds are the same size (large)
  • in Slicer, the camera in the 2d view is looking at the 2d scene from a camera distance of 1.0 while the default 3D distance is 600.0
  • in the pure CTK test case, resetting the 3D camera to a position (0,0,600) the same issues can be seen as are visible in Slicer (tiny seed in 3D, large in 2D)
  • talking with Jim:
    • when background volume changes, reset the camera position for each slice view to take into account the bounding box of the data
    • use a distance calculation formula that takes the viewing angle into account (default 30): (max_data_dim/2.0) / sin(view_angle / 2.0)
  • once have a new setting:
    • reset the scale factor 2d on the 2d fid disp manager to 1.0
    • reset the Z distance of the camera position in the slice view
      • make sure set the camera on the correct renderer
        • there is an overlay renderer on the slice viewers so using the first renderer from the collection in my ctk example didn't work
        • get the renderer from the light box manager at all times, a light box index of 0 is always fine
        • turns out that when creating a new seed, you need to explictly reset the renderer on the new handle
        • lost ability to manipulate seeds, need more debugging
    • trigger rerendering of the seeds (in tests, we needed to remove all and readd them to see the new size)
    • double check placing rulers and ROIs in 2d
    • double check display to world coordinate calculation in the 2d disp managers