From NAMIC Wiki
Jump to: navigation, search
Home < Projects:RegistrationImprovement

Registration Improvements

This page will describe registration improvements made within Slicer3 to improve the usability and robustness of registration algorithms so they may be used in an interactive clinical setting.

Key Contributors

  • Kitware: Casey Goodlett with consultation from Will Schroeder and Stephen Aylward
  • BWH: Ron Kikinis, Dominik Meier, Andriy Fedorov

RegisterImages Algorithm

A user should typically one of the Pipeline methods (PipelineRigid, PipelineAffine, PipelineBspline) as these will run Initalization -> Rigid -> Affine -> Bspline to the specified level. These are run in order to convergence or maximum # of iterations. Within each pipeline step there is a two stage optimization. First the evolution optmizer is run to stochastically chose a starting location for optimization. After this the FRPR optimizer is used. Currently multi-resolution optimization is only used in the bspline level.

Improvement Ideas

  • Use multi-resolution at all stages
  • The prestage to affine maybe should be similarity not rigid (based on assumption that its hard to optimize rotation without scale change).
  • Learn from FSL flirt to make an extensive test of a grid of possible rotations to get a good initialization for rotations.
  • Ability to specify masks that are used to limit were samples are drawn (this should ultimately be both a label image or a user drawn box)

Timeline of contributions

September 11, 2009

Merge two new modules that present a simplified view of RegisterImages into Slicer3 to show up in Modules Menu hierarchy Menu hierarchy screenshot

September 9, 2009

Sync default parameters between GUI and command line version of RegisterImages

August 21, 2009

Initial Project Meeting

August 18, 2009

  • Link landmark initalization with fiducials framework in Slicer3
  • Link transform save and load with TransformIO in Slicer3