Published July 7, 2026 | Version v3.5.2
Software Open

TractoR

Authors/Creators

  • 1. University College London
  • 2. The University of Edinburgh

Description

  • The track script could produce incomplete results when more than one seed region was specified – for example a named region matching several parcellation labels – with the default Strategy:global. Only one of the requested regions ended up contributing to the output. This has been corrected, and the whole seed area is now always combined into a single result, as documented. Profile outputs now have named columns where region names are available, as intended.
  • The reg-nonlinear script will no longer produce an error when the named transform does not already exist (although performing linear registration first is still recommended).
  • The values script will no longer fail if a mask image is not specified.
  • Using the apply script's "Combine" mode with a function that reduces each image to a short vector, rather than operating pointwise, could cause an error. This has been fixed.
  • The smooth script with the WidthType:fwhm option previously produced a Gaussian kernel of the wrong width, due to an operator-precedence bug in the underlying calculation. This has been corrected.
  • Reading a corrupted or truncated MRtrix .tck file with an incomplete header could cause TractoR to hang indefinitely rather than reporting an error. This has been fixed.
  • Reading and mapping .trk files, for example with trkmap, has been made more robust. An invalid seed-point index, or streamline coordinates lying outside the image bounds could previously cause a crash, and a separate, rare defect could cause streamline "seed" properties to go unrecognised.
  • When processing a batch of sessions, the pnt-viz script could use fewer seed points than requested for sessions handled after one with relatively few valid matches. This has been corrected.
  • An unusual case in which trimming a streamline left only its seed point, which can arise when building tract models for probabilistic neighbourhood tractography, is now handled correctly.
  • The compare script produced an obscure error, rather than simply reporting no match, when comparing two images with IgnoreZeroes:true that share no nonzero voxels. This has been corrected.
  • The transform script now produces a more informative error if asked to transform a point without a source space specified.
  • The supplied Rprofile now checks whether the target of TRACTOR_HOME exists, and only prioritises packages installed in TractoR's library for calls to its scripts.
  • The tractor binary is now more defensive when parsing its arguments, and avoids potentially dereferencing an uninitialised pointer.

Notes

If you use this software, please cite it using the metadata from this file.

Files

tractor/tractor-v3.5.2.zip

Files (66.7 MB)

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Additional details

Related works

Is supplement to
Software: https://github.com/tractor/tractor/tree/v3.5.2 (URL)

Software

Repository URL
https://github.com/tractor/tractor