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Introduction and Acknowledgements

This work is part of the National Alliance for Medical Image Computing (NA-MIC), funded by the National Institutes of Health through the NIH Roadmap for Medical Research, Grant U54 EB005149. Information on NA-MIC can be obtained from the NA-MIC website. Author: Bill Lorensen Contact: Bill Lorensen

NA-MIC   Surgical Planning Laboratory

Module Description

Registers two images together using BSpline transform and mutual information.

Use Cases

Most frequently used for these scenarios:

• Use Case 1:

Example BSpline deformation of a liver CT dataset. Superimposed gridlines indicate extent of deformation applied.

Tutorials

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Panels

Parameters:

• Registration Parameters
  • Iterations: Number of iterations
  • Grid Size: Number of grid points on interior of the fixed image. Larger grid sizes allow for finer registrations.
  • Histogram Bins: Number of histogram bins to use for Mattes Mutual Information. Reduce the number of bins if a deformable registration fails. If the number of bins is too large, the estimated PDFs will be a field of impulses and will inhibit reliable registration estimation.
  • Spatial Samples: Number of spatial samples to use in estimating Mattes Mutual Information. Larger values yield more accurate PDFs and improved registration quality.
  • Constrain Deformation: Constrain the deformation to the amount specified in Maximum Deformation
  • Maximum Deformation: If Constrain Deformation is checked, limit the deformation to this amount.
  • Default Pixel Value: Default pixel value used if resampling a pixel outside of the volume.
• IO
  • Initial transform: Initial transform for aligning the fixed and moving image. Maps positions in the fixed coordinate frame to positions in the moving coordinate frame. This transform should be an affine or rigid transform. It is used an a bulk transform for the BSpline. Optional.
  • Fixed Image: Fixed image to which to register
  • Moving Image: Moving image
  • Output transform: Transform calculated that aligns the fixed and moving image. Maps positions from the fixed coordinate frame to the moving coordinate frame. Optional (specify an output transform or an output volume or both).
  • Output warp: Vector field that applies an equivalent warp as the BSpline. Maps positions from the fixed coordinate frame to the moving coordinate frame. Optional.
  • Output Volume: Resampled moving image to fixed image coordinate frame. Optional (specify an output transform or an output volume or both).

Similar Modules

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References

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Information for Developers

Section under construction.