SYNOPSIS
groupwise_warp [options] affineGroupRegistrationDESCRIPTION
This tool nonrigidly registers a population of input images simultaneously, without a template, using either the 'congealing' algorithm or a groupwise similarity measure based on a continuous approximation of mutual information ('RMI').OPTIONS
Global Toolkit Options (these are shared by all CMTK tools)
- --help
- Write list of basic command line options to standard output.
- --help-all
- Write complete list of basic and advanced command line options to standard output.
- --wiki
- Write list of command line options to standard output in MediaWiki markup.
- --man
- Write man page source in 'nroff' markup to standard output.
- --version
- Write toolkit version to standard output.
- --echo
- Write the current command line to standard output.
- --verbose-level <integer>
- Set verbosity level.
- --verbose, -v
- Increment verbosity level by 1 (deprecated; supported for backward compatibility).
- --threads <integer>
- Set maximum number of parallel threads (for POSIX threads and OpenMP).
Registration Metric Options
- --rmi
- Use the RMI (a.k.a. regional mutual information) metric to drive the registration).
- --congeal
- Use the congealing algorithm using pixelwise stack entropies to drive the registration. [This is the default]
Template Image Options
- --template <string>, -t <string>
- Override template image with given file. [Default: NONE]
- --template-with-data <string>, -T <string>
- Use user-supplied template images's pixel data in registration [Default: disabled]
Multuresolution Parameters
- --downsample-from <integer>, -d <integer>
- Initial downsampling factor [4]. [Default: 4]
- --downsample-to <integer>, -D <integer>
- Final downsampling factor [1]. [Default: 1]
- --sampling-density <float>, -s <float>
- Probabilistic sampling density [default: off]. [Default: -1]
Output Options
- --output-root <string>, -O <string>
- Root directory for all output files. [Default: NONE]
- --output <string>, -o <string>
- Output filename for groupwise registration archive. [Default: groupwise.xforms]
- --output-average <string>
- Output filename for registered average image. [Default: average.nii]
- --no-output-average
- Do not write average image.
- --average-cubic
- Use cubic interpolation for average image (default: linear)
Image Options and Operations
- --force-background <integer>, -B <integer>
- Force background pixels (outside FOV) to given (bin) value. [Default: disabled]
- --histogram-bins <integer>, -H <integer>
- Set number of histogram bins for entropy evaluation. [Default: disabled]
- --crop-histograms
- Crop image histograms to make better use of histogram bins.
- --match-histograms
- Match all image histograms to template data (or first image, if no template image is given)
- --repeat-match-histograms
- Frequetly repeat histogram-based intensity matching to account for changing volume proportions.
- --smooth-pixels <double>
- Sigma of Gaussian smoothing kernel in multiples of template image pixel size [Default: disabled]
- --smooth-cps <double>
- Sigma of Gaussian smoothing kernel in multiples of control point delta [Default: disabled]
Transformation Parameters
- --grid-spacing <double>
- Control point grid spacing. [Default: 40]
- --grid-spacing-fit
- Use grid spacing that fits volume FOV
- --refine-grid <integer>, -r <integer>
- Number of times to refine transformation grid [default: 0]. [Default: 0]
Transformation Constraint Options
- --zero-sum, -z
- Enforce zero-sum computation.
- --zero-sum-no-affine
- Enforce zero-sum computation EXCLUDING affine components.
- --normal-group-first-n <integer>, -N <integer>
- First N images are from the normal group and should be registered unbiased. [Default: 0]
- --zero-sum-first-n <integer>, -Z <integer>
- Enforce zero-sum computation for first N images. [Default: disabled]
- --jacobian-weight <float>, -J <float>
- Weight for Jacobian volume preservation constraint [default: off] [Default: 0]
- --bending-energy-weight <float>, -E <float>
- Weight for grid bending energy regularization constraint [default: off] [Default: 0]
Optimization Parameters
- --exploration <double>, -e <double>
- Exploration of optimization in pixels [Default: 0.25]
- --accuracy <double>, -a <double>
- Accuracy of optimization in pixels [Default: 0.01]
- --step-factor <double>, -S <double>
- Step factor for successive optimization passes [Default: 0.5]
- --delta-f-threshold <double>
- Optional threshold to terminate optimization (level) if relative change of target function drops below this value. [Default: 0]
- --partial-gradient-thresh <float>, -p <float>
- Threshold factor for partial gradient zeroing [<0 turn off] [Default: 0]
- --activate-uninformative
- Activate potentially uninformative control points
- --disable-cp-mask <string>
- Path to mask image (matching template grid) defining areas in which control points should be disabled. This guarantees that mask foreground areas remain undeformed. [Default: NONE]
- --disable-optimization
- Disable optimization and output initial configuration.
AUTHORS
Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav HalchenkoBUGS
Report bugs at http://nitrc.org/projects/cmtk/ACKNOWLEDGMENTS
CMTK is developed with support from the NIAAA under Grant AA021697, National Consortium on Alcohol and Neurodevelopment in Adolescence (N-CANDA): Data Integration Component. From April 2009 through September 2011, CMTK development and maintenance was supported by the NIBIB under Grant EB008381.