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# nipype.interfaces.semtools.diffusion.tractography.fibertrack module

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## fibertrack

Link to code

> Bases: SEMLikeCommandLine

> Wrapped executable: `fibertrack`.

> title: FiberTrack (DTIProcess)

> category: Diffusion.Tractography

> description: This program implements a simple streamline tractography method based on the principal eigenvector of the tensor field. A fourth order Runge-Kutta integration rule used to advance the streamlines. As a first parameter you have to input the tensor field (with the –input_tensor_file option). Then the region of interest image file is set with the –input_roi_file. Next you want to set the output fiber file name after the –output_fiber_file option. You can specify the label value in the input_roi_file with the –target_label, –source_label and –fobidden_label options. By default target label is 1, source label is 2 and forbidden label is 0. The source label is where the streamlines are seeded, the target label defines the voxels through which the fibers must pass by to be kept in the final fiber file and the forbidden label defines the voxels where the streamlines are stopped if they pass through it. There is also a –whole_brain option which, if enabled, consider both target and source labels of the roi image as target labels and all the voxels of the image are considered as sources. During the tractography, the –fa_min parameter is used as the minimum value needed at different voxel for the tracking to keep going along a streamline. The –step_size parameter is used for each iteration of the tracking algorithm and defines the length of each step. The –max_angle option defines the maximum angle allowed between two successive segments along the tracked fiber.

> version: 1.1.0

> documentation-url: http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Extensions/DTIProcess

> license: Copyright (c) Casey Goodlett. All rights reserved.
>   See http://www.ia.unc.edu/dev/Copyright.htm for details.

>     This software is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the above copyright notices for more information.

> contributor: Casey Goodlett

> acknowledgements: Hans Johnson(1,3,4); Kent Williams(1); (1=University of Iowa Department of Psychiatry, 3=University of Iowa Department of Biomedical Engineering, 4=University of Iowa Department of Electrical and Computer Engineering) provided conversions to make DTIProcess compatible with Slicer execution, and simplified the stand-alone build requirements by removing the dependancies on boost and a fortran compiler.

> argsa unicode string

>   Additional parameters to the command. Maps to a command-line argument: `%s`.

> environa dictionary with keys which are a bytes or None or a value of class ‘str’ and with values which are a bytes or None or a value of class ‘str’

>   Environment variables. (Nipype default value: `{}`)

> forbidden_labelan integer (int or long)

>   Forbidden label. Maps to a command-line argument: `--forbidden_label %d`.

> forcea boolean

>   Ignore sanity checks. Maps to a command-line argument: `--force`.

> input_roi_filea pathlike object or string representing an existing file

>   The filename of the image which contains the labels used for seeding and constraining the algorithm. Maps to a command-line argument: `--input_roi_file %s`.

> input_tensor_filea pathlike object or string representing an existing file

>   Tensor Image. Maps to a command-line argument: `--input_tensor_file %s`.

> max_anglea float

>   Maximum angle of change in radians. Maps to a command-line argument: `--max_angle %f`.

> min_faa float

>   The minimum FA threshold to continue tractography. Maps to a command-line argument: `--min_fa %f`.

> output_fiber_filea boolean or a pathlike object or string representing a file

>   The filename for the fiber file produced by the algorithm. This file must end in a .fib or .vtk extension for ITK spatial object and vtkPolyData formats respectively. Maps to a command-line argument: `--output_fiber_file %s`.

> really_verbosea boolean

>   Follow detail of fiber tracking algorithm. Maps to a command-line argument: `--really_verbose`.

> source_labelan integer (int or long)

>   The label of voxels in the labelfile to use for seeding tractography. One tract is seeded from the center of each voxel with this label. Maps to a command-line argument: `--source_label %d`.

> step_sizea float

>   Step size in mm for the tracking algorithm. Maps to a command-line argument: `--step_size %f`.

> target_labelan integer (int or long)

>   The label of voxels in the labelfile used to constrain tractography. Tracts that do not pass through a voxel with this label are rejected. Set this keep all tracts. Maps to a command-line argument: `--target_label %d`.

> verbosea boolean

>   Produce verbose output. Maps to a command-line argument: `--verbose`.

> whole_braina boolean

>   If this option is enabled all voxels in the image are used to seed tractography. When this option is enabled both source and target labels function as target labels. Maps to a command-line argument: `--whole_brain`.

> output_fiber_filea pathlike object or string representing an existing file

>   The filename for the fiber file produced by the algorithm. This file must end in a .fib or .vtk extension for ITK spatial object and vtkPolyData formats respectively.