---
name: "cmtk-fit_spline_xform"
section: "1"
platform: "linux"
package: "cmtk"
version: "3.3.1p2+dfsg-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/cmtk-fit_spline_xform"
---

# cmtk-fit\_spline\_xform(1)

Fit Single B-Spline Transformation to Concatenated Transformation List

## NAME

fit\_spline\_xform - Fit Single B-Spline Transformation to Concatenated Transformation List

## SYNOPSIS

**fit\_spline\_xform** InputImage XformList

## DESCRIPTION

Fit a parametric nonrigid transformation (B-spline free-form deformation) to a list of concatenated, optionally inverted, transformations.

## 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).

### Fitting Options

- **--levels** *\<integer\>*

  Number of levels in the multi-level B-spline approximation procedure. **\[Default: 1\]**

- **--fit-affine-first**

  Fit affine transformation first, then initialize spline with it.

- **--final-cp-spacing** *\<double\>*

  Final control point grid spacing of the output B-spline transformation. **\[Default: 0\]**

- **--final-cp-dims** *\<string\>*

  Final control point grid dimensions (i.e., number of controlpoints) of the output B-spline transformation. To be provided as 'dimX,dimY,dimZ'. **\[Default: NONE\]**

### Input Options

- **--inversion-tolerance** *\<double\>*

  Numerical tolerance of B-spline inversion in mm. Smaller values will lead to more accurate inversion, but may increase failure rate. **\[Default: 1e-08\]**

### Output Options

- **--output** *\<transformation-path\>*, **-o** *\<transformation-path\>*

  Path for the output transformation. **\[Default: NONE\]**

## AUTHORS

Torsten Rohlfing, with contributions from Michael P. Hasak, Greg Jefferis, Calvin R. Maurer, Daniel B. Russakoff, and Yaroslav Halchenko

## LICENSE

http://www.fsf.org/licensing/licenses/gpl.html

## BUGS

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.