Version 1.5.6 (build 2984)
Wed Jan 25 22:47:55 EST 2012
* Partial fix for B-spline registration problems when direction cosines 
  are not identity
* B-spline warper is now multi-threaded
* Fix memory error with large image sizes
* New slicer plugin for isodose, dose comparison extraction
* Fix bug rasterizing more than eight structures
* Fix program abort when putting B-spline stage after demons stage
* Fix program abort when writing dicom for images without 
  existing metadata
* Add vector field to B-spline converter to xf-convert command
* Get metadata from referenced CT if there is no other existing metadata
* Option feval_max is now respected when using the liblbfgs optimizer 
  with B-splines
* Improve portability to big-endian, unsigned char platforms
* Add direction cosines option to resample command
* Fix bug where dicom output was not written for fill command
* Add panel offset option to FDK reconstructor

Version 1.5.5 (build 2868)
Mon Oct 31 00:35:29 EDT 2011
* Add support for landmark penalty to B-spline registration
* First working version of plastimatch autolabel
* Add --xor-contours option for converting DICOM-RT structure sets
* Implement a primitive synthetic_vf command
* Fix bug where demographics weren't loaded when converting Xio dose
* Fix bug where Xio dose was not converted due to version mismatch
* Fix bug loading pointsets in txt format

Version 1.5.4 (build 2832)
Mon Oct 10 00:20:35 EDT 2011
* Include reg-2-3 in default build
* Add plastimatch probe command
* Add landmark_diff program
* Add support for numeric implementation of B-spline regularization
* Add support for different image resolutions to Dice
* Remove automatic parsing of current directory for dicom images
* Early support for optimized histogram binning for mutual information
* Early support for reading images with irregular slice spacing
* Fix bug in converting between image types, where values were being 
  incorrectly clamped
* Fix bug in Nocedal optimizer where wrong answer is returned when 
   optimization ends during partial line search
* Fix bug where Nocedal optimizer would run out of memory during 
  initialization of large problems
* Fix bug where --fixed option was ignored when resampling vector fields
* Fix bug in image resampling between stages of multi-resolution registration
* Fix bug with mutual information during multi-resolution registration

Version 1.5.3 (build 2678)
Sun Aug 14 21:56:51 EDT 2011
* Add support for signed char image type
* Add output image type to slicer bspline plugin
* Add bspline regularization to slicer bspline plugin
* Add ss_list (structure set name) file input/output to slicer dicomrt
  import/export plugins
* Fix/workaround problem with b-spline regularization on images with 
  negative voxel spacing
* Fix bug where pixel values were wrapped instead of clamped when 
  converting to a pixel type with smaller range of values
* Fix bug where img_out_type field was ignored in registration command file
* Remove deprecated brook code

Version 1.5.2 (build 2621)
Sun Jul 24 21:06:48 EDT 2011
* Fix build problem with cuda
* Fix regression on loading mha files without direction cosines

Version 1.5.1 (build 2617)
* Reg-2-3 code for 2D-3D registration
* Slicer plugin enhancements: XFORM warper, synthetic images, DVH display
* Early prototype of B-spline regularization
* Many bug fixes

Version 1.5.0 (build 2498)
* CUDA-accelerated mutual information for B-splines
* Regularized gaussian landmark splines
* Replace cone RBF with Wendland RBF
* Better handling of image metadata
* Many improvements to image conversion and warping

Version 1.4.0 (svn only)
* Native grid-aligned B-spline registration (MSE: CUDA, OpenMP, MI: CPU)
* Native demons registration (Brook, CPU)
* Wrappers for some ITK registration transforms: translation, rigid, 
  affine, B-spline, demons
* Global thin-plate spline (ITK), local cone RBF (native)
* Multistage registration framework
* FDK cone-beam reconstruction (CUDA, OpenMP)
* DRR generation (CUDA, OpenMP)
* Dicom image import/export, DicomRT structure set import/export
* XiO image import, XiO structure set import/export
* 3D slicer plugins
* Mondoshot screen capture program
