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For the latest Slicer documentation, visit the read-the-docs.

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3D Slicer is a flexible platform that can be easily extended to enable development of both interactive and batch processing tools for a variety of applications.

3D Slicer provides image registration, processing of DTI (diffusion tractography), an interface to external devices for image guidance support, and GPU-enabled volume rendering, among other capabilities. 3D Slicer has a modular organization that allows the easy addition of new functionality and provides a number of generic features not available in competing tools. Finally, 3D Slicer is distributed under a non-restrictive BSD license.

The interactive visualization capabilities of 3D Slicer include the ability to display arbitrarily oriented image slices, build surface models from image labels, and high performance volume rendering. 3D Slicer also supports a rich set of annotation features (fiducials and measurement widgets, customized colormaps). To the best of our knowledge, no individual segmentation tool provides such powerful visualization capabilities for the user as 3D Slicer. (These paragraphs were provided by A. Fedorov and C. Lisle)

The 3.6 release of 3D Slicer contains significant changes both to the organization of the software and to the functionality. Please check the 3.6 Announcement page for a list of those changes. The community contributing to Slicer 3.6 is acknowledged here.

Main GUI




Informatics Modules




Diffusion MRI


Time Series


Surface Models



Slicer Extensions


  • Slicer Extensions are the "on-ramp" to the Slicer "highway". They provide are a mechanism for anybody, including third parties, to provide modules which extend the functionality of 3d Slicer.
  • While the Slicer license is suggested, it is not required for extensions. Please review the documentation of the extension carefully.
  • For a subset of extensions, you can use the extension wizard in Slicer to find their webpages and to install/uninstall individual extensions.
  • The version that is available through the extension manager is chosen by the developer of that extension
  • Not all extensions are available on all platforms. See here for the extension status.
  • In case of problems with extensions, please talk directly to the developers of the extensions.
  • Information for developers can be found here.

Available Extensions

  • VMTKLevelSetSegmentation providing level-set segmentation of vessels, aneurysms and tubular structures using different algorithms for initialization and evolution

Installation Instructions

  • Click on the cogwheel icon to start the extensions wizard (highlighted in red)

Extensions Wizard

Extension manager dialog box

To add extension modules to an installed binary of slicer:

  • Use the View->Extension Manager menu option
  • The dialog will be initialized with the URL to the extensions that have been compiled to match your binary of slicer.
    • Note installing extensions from a different repository URL is likely to be unstable due to platform and software version differences.
    • You can select a local install directory for your downloaded extensions (be sure to choose a directory with enough free space).
  • Select the extensions you wish to install and click to download them. Installed extensions will be available when you restart slicer.
  • To turn modules on or off, you can use the Module Settings page of the View->Application Settings dialog.

Info for Developers

For explanations for developers see  here

Other information

Developer Tools

Non-SPL Supported Compatibility Packages

QA Table

Slicer 3.6 QA table