Slicer, or 3D Slicer, is a free, open source software package for visualization and image analysis. 3D Slicer is natively designed to be available on multiple platforms, including Windows, Linux and Mac Os X.

Slicer 4.4 is the official release as of July 2015.


  • Robust Dicom Capabilities
  • Interactive Segmentation
  • Volume Rendering
  • Rigid and Nonrigid Registration
  • SceneSnapshot Screen Capture Functionality
  • 4D Image Viewer
  • Flexible Layouts and Slice Viewers
  • Extension Manager for exploring and installing plug-ins
Slicer 4.4 released in July 2015. See the Announcements for more information.

You may download different versions of Slicer3 and find pointers to the source code, mailing lists and bug tracker. Please note that Slicer continues to be a research package and is not intended for clinical use. Testing of functionality is an ongoing activity with high priority, however, some features of 3D Slicer are not fully tested.

Our Philosophy

Slicer is a community platform created for the purpose of subject specific image analysis and visualization.

  • Multi-modality imaging including, MRI, CT, US, nuclear medicine, and microscopy
  • Multi organ from head to toe
  • Bidirectional interface for devices
  • Expandable and interfaced to multiple toolkits

3D Slicer consists of more than over 370k lines of code, mostly C++. This massive software development effort has been enabled by the participation of several large scale NIH funded efforts, including the NA-MIC, NAC, BIRN, CIMIT and NCIGT communities. The funding support comes from several federal funding sources including NCRR (through December, 2011), NIBIB, NIH Roadmap, NCI, NSF and the DOD as well as others.

Portal pages on this website have been designed for end users and developers.

Slicer executables and source code are available under a BSD-style, free open source licensing agreement under which there are no reciprocity requirements, no restrictions on use, and no guarantees of performance. Slicer leverages a variety of toolkits and software methodologies that have been labeled the NA-MIC kit. Please click here to read more about the NA-MIC kit.

History: Slicer was initiated as a masters thesis project between the Surgical Planning Laboratory at the Brigham and Women's Hospital and the MIT Artificial Intelligence Laboratory in 1998. Slicer has been downloaded many thousand times. A variety of publications were enabled by the Slicer software. A new, completely rearchitected version of Slicer was developed and has been released in 2007. In May of 2008 version 3.2, in May of 2009 version 3.4 and in June of 2010 version 3.6 has been released. Slicer 4.0 was introduced in November 2011, Slicer 4.1 in April 2012, Slicer 4.2 in October 2012 and 4.3 in September 2013.

Slicer and Image-Guided Therapy

With IRB clinical protocols appropriately created and managed, Slicer has been used in clinical research. In image-guided therapy research, Slicer is frequently used to construct and visualize collections of MRI data that are available pre- and intraoperatively to allow for the acquiring of spatial coordinates for instrument tracking. In fact, Slicer has already played such a pivotal role in image-guided therapy, it could be thought of as growing up alongside that field.

Slicer provides a graphical user interface to interact with the data. In addition to manual segmentation and the creation of 3D surface models from conventional MRI images, Slicer has also been used for non-rigid image registration and to incorporate models of the neurovascular bundle using image segmentation in MRI-guided prostate interventions.