SimpleITK is a simplified interface to the Insight Toolkit (ITK) for image registration and segmentation

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SimpleITK

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SimpleITK is an image analysis toolkit with a large number of components supporting general filtering operations, image segmentation and registration. It is built on top of the Insight Segmentation and Registration Toolkit ITK with the intent of providing a simplified interface to ITK. SimpleITK itself is written in C++ but is available for a large number of programming languages. Currently, these include:

Wrapping of the C++ code is accomplished through SWIG, in principle, any language wrapped by SWIG should be applicable to SimpleITK.

Unlike ITK's support of n-dimensional spatio-temporal images, SimpleITK supports 2D, 3D and 4D images. The dimensionality refers to spatio-temporal dimensions, the voxels can be n-dimensional vectors.

SimpleITK is licensed under the Apache License.

Acknowledgments

SimpleITK development has been supported by:

The Intramural Research Program of the National Institutes of Health, National Institute of Allergy and Infectious Diseases.
The US National Library of Medicine under the American Recovery and Reinvestment Act (ARRA) and under the Intramural Research Program of the U.S. National Institutes of Health.
The Insight Software Consortium and the ITK user and developer communities.

License and Copyright

The SimpleITK project is part of the Insight Software Consortium(ISC) a non-profit educational consortium dedicated to promoting and maintaining open-source, freely available software for bio-medical image analysis. The copyright is held by NumFOCUS. The SimpleITK software is distributed under the Apache License 2.0.

How to Cite

If you found SimpleITK useful in your research, support our efforts by citing the relevant publication(s):

R. Beare, B. C. Lowekamp, Z. Yaniv, "Image Segmentation, Registration and Characterization in R with SimpleITK", J Stat Software, 86(8), https://doi.org/10.18637/jss.v086.i08, 2018.

Z. Yaniv, B. C. Lowekamp, H. J. Johnson, R. Beare, "SimpleITK Image-Analysis Notebooks: a Collaborative Environment for Education and Reproducible Research", J Digit Imaging., 31(3): 290-303, https://doi.org/10.1007/s10278-017-0037-8, 2018.

B. C. Lowekamp, D. T. Chen, L. Ibáñez, D. Blezek, "The Design of SimpleITK", Front. Neuroinform., 7:45. https://doi.org/10.3389/fninf.2013.00045, 2013.

Documentation

With massive libraries like SimpleITK, good documentation is a must. The documentation for SimpleITK is split up into multiple levels:

API Documentation - This contains class and function documentation. The descriptions for functions and classes are primarily borrowed from the original ITK C++ classes.
SimpleITK Documentation - This site contains high-level guides (fundamental SimpleITK concepts, common conventions, etc.), details with respect to the toolkit's binary distributions, instructions for building the toolkit, as well as SimpleITK examples in all supported programming languages.
Jupyter Notebook Repository - This repository contains a collection of Jupyter Notebooks illustrating the use of SimpleITK for educational and research activities. The notebooks demonstrate the use of SimpleITK for interactive image analysis using the Python and R programming languages. Recommended reading, if you are starting with SimpleITK.

Support

SimpleITK provides access to most of the ITK components, but not all. If you are looking for something specific and can't find it, open an issue on GitHub or ask for support on the forum.

Report and Issue or Request a Feature

Please use the issue tracker to report problems or request features.

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This version

2.5.3

Nov 21, 2025

2.5.2

Jun 16, 2025

2.5.0

Apr 28, 2025

2.4.1

Jan 13, 2025

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Aug 14, 2024

2.3.1

Nov 6, 2023

2.3.0

Sep 13, 2023

2.2.1

Dec 8, 2022

2.2.0

Aug 29, 2022

2.1.1.2

Apr 18, 2022

2.1.1.1 yanked

Apr 7, 2022

Reason this release was yanked:

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2.1.1

Sep 10, 2021

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Jul 23, 2021

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Dec 2, 2020

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Oct 21, 2020

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