# Latest

**URL:** https://discourse.itk.org/latest.md?page=1

[Latest](https://discourse.itk.org/latest.md) · [Categories](https://discourse.itk.org/categories.md) · [Tags](https://discourse.itk.org/tags.md)

**Page:** 2

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## [Reorganize RemoteModules for reduced maintenance burden](https://discourse.itk.org/t/reorganize-remotemodules-for-reduced-maintenance-burden/7753)

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**Author:** [@hjmjohnson](https://discourse.itk.org/u/hjmjohnson)\
**Replies:** 3\
**Last updated:** [April 16, 2026, 12:51am UTC](https://discourse.itk.org/t/reorganize-remotemodules-for-reduced-maintenance-burden/7753 "2026-04-16T00:51:16Z")

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RFC: Consolidating remote modules into hierarchical category repos Tracking issue: ENH: Consolidate remote modules into hierarchical category repos · Issue #6060 · InsightSoftwareConsortium/ITK · GitHub ITK currently ma…

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## [AI generated pull requests overwhelming, hard to review carefully](https://discourse.itk.org/t/ai-generated-pull-requests-overwhelming-hard-to-review-carefully/7728)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 16\
**Last updated:** [April 14, 2026, 5:20pm UTC](https://discourse.itk.org/t/ai-generated-pull-requests-overwhelming-hard-to-review-carefully/7728 "2026-04-14T17:20:16Z")

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The current stream of AI generated (or AI aided) pull requests is a bit overwhelming to me. It is hard for me to review them carefully. In general, I try to avoid reviewing any pull request that proposes changing thousa…

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## [Template class already defined when using ITK TestDriver](https://discourse.itk.org/t/template-class-already-defined-when-using-itk-testdriver/3807)

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**Author:** [@LucasGandel](https://discourse.itk.org/u/LucasGandel)\
**Replies:** 3\
**Last updated:** [April 14, 2026, 2:22pm UTC](https://discourse.itk.org/t/template-class-already-defined-when-using-itk-testdriver/3807 "2026-04-14T14:22:26Z")

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We are facing redefinition issues when using the ITK TestDriver approach for testing the RTK remote module (following a previous discussion here). When linking the TestDriver executable to the RTK test libs, the MSVC li…

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## [Path length limitation in Windows lifted](https://discourse.itk.org/t/path-length-limitation-in-windows-lifted/545)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 15\
**Last updated:** [April 14, 2026, 12:19pm UTC](https://discourse.itk.org/t/path-length-limitation-in-windows-lifted/545 "2026-04-14T12:19:36Z")

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With a recent version of Windows 10, paths longer than 260 characters can be enabled. But we need to account for that possibility in ITK in order to take advantage of it.

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## [Patches for ITK 5.4.3](https://discourse.itk.org/t/patches-for-itk-5-4-3/7454)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 5\
**Last updated:** [April 13, 2026, 9:12pm UTC](https://discourse.itk.org/t/patches-for-itk-5-4-3/7454 "2026-04-13T21:12:39Z")

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Hi folks, The next patch (bugfix) release, ITK 5.4.3, is coming up. Patches currently staged on the Git release-5.4 branch are: Dženan Zukić (1): DOC: Remove duplicate new author name (Matthieu LAURENDEAU) …

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## [pixel positions in every slice is not uniform](https://discourse.itk.org/t/pixel-positions-in-every-slice-is-not-uniform/7746)

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**Author:** [@jsemeda](https://discourse.itk.org/u/jsemeda)\
**Replies:** 1\
**Last updated:** [April 8, 2026, 12:58pm UTC](https://discourse.itk.org/t/pixel-positions-in-every-slice-is-not-uniform/7746 "2026-04-08T12:58:55Z")

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I am getting the 3d position of the pixels in every slice. I use the “TransformIndexToPhysicalPoint” to get the 3d position of pixels. I looked at the corner pixel in every slice, index (0, 0, 0), and the results are not…

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## [error in sitkFlipImageFiler.h (120) and sitkGridImageSource.h (245) in Basic Filters](https://discourse.itk.org/t/error-in-sitkflipimagefiler-h-120-and-sitkgridimagesource-h-245-in-basic-filters/7743)

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**Author:** [@jsemeda](https://discourse.itk.org/u/jsemeda)\
**Replies:** 3\
**Last updated:** [April 6, 2026, 6:30pm UTC](https://discourse.itk.org/t/error-in-sitkflipimagefiler-h-120-and-sitkgridimagesource-h-245-in-basic-filters/7743 "2026-04-06T18:30:31Z")

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getting this error in both header files Element ‘1’: conversion from ‘int’ to ‘bool’ requires a narrowing conversion I would like to know if I should be using the ITK header files from within the SITK code, or from the…

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## [ITKElastix for Mesh Transformation: TransformixFilter.GetOutputMesh() returns None](https://discourse.itk.org/t/itkelastix-for-mesh-transformation-transformixfilter-getoutputmesh-returns-none/7615)

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**Author:** [@DVigneault](https://discourse.itk.org/u/DVigneault)\
**Replies:** 4\
**Last updated:** [April 6, 2026, 1:27pm UTC](https://discourse.itk.org/t/itkelastix-for-mesh-transformation-transformixfilter-getoutputmesh-returns-none/7615 "2026-04-06T13:27:51Z")

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All– Say I have used elastix to register a moving image moving.nii.gz to a fixed image fixed.nii.gz, resulting in a transformation file params.txt. I would now like to apply the transformation in params.txt to a mesh i…

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## [elastix 5.3.0 released!](https://discourse.itk.org/t/elastix-5-3-0-released/7707)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 2\
**Last updated:** [April 6, 2026, 1:00pm UTC](https://discourse.itk.org/t/elastix-5-3-0-released/7707 "2026-04-06T13:00:03Z")

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:tada: I’m very pleased to announce that we have just released version 5.3.0 of our image registration toolbox elastix, at https://github.com/SuperElastix/elastix/releases Binaries of elastix executables are provided f…

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## [std::mdspan interface for images](https://discourse.itk.org/t/std-mdspan-interface-for-images/7742)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 0\
**Last updated:** [April 2, 2026, 7:51pm UTC](https://discourse.itk.org/t/std-mdspan-interface-for-images/7742 "2026-04-02T19:51:10Z")

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I know we can’t require C++23 anytime soon, but std::mdspan is quite relevant feature for ITK. Are there any thoughts about how to best exploit it, once we are able to rely on it?

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## [Moving data from VTK to ITK: issue in memory management](https://discourse.itk.org/t/moving-data-from-vtk-to-itk-issue-in-memory-management/7740)

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**Author:** [@Boris38](https://discourse.itk.org/u/Boris38)\
**Replies:** 4\
**Last updated:** [March 31, 2026, 2:35pm UTC](https://discourse.itk.org/t/moving-data-from-vtk-to-itk-issue-in-memory-management/7740 "2026-03-31T14:35:30Z")

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Hello everyone, I was advised to post this topic here. But the initial issue is here: Moving data from VTK to ITK: issue in memory management - Support - VTK I use ITK (5.4.4) and VTK (9.5.2) in my code. I use some VTK…

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## [Greptile](https://discourse.itk.org/t/greptile/7737)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 6\
**Last updated:** [March 26, 2026, 1:38pm UTC](https://discourse.itk.org/t/greptile/7737 "2026-03-26T13:38:26Z")

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I got an email from Greptile: Greptile lets you add custom rules to enforce your organization’s preferences, coding standards and best practices automatically across pull requests. You can configure them in two way…

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## [ITK 6.0 Beta 2 has been released!](https://discourse.itk.org/t/itk-6-0-beta-2-has-been-released/7738)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 1\
**Last updated:** [March 25, 2026, 4:11pm UTC](https://discourse.itk.org/t/itk-6-0-beta-2-has-been-released/7738 "2026-03-25T16:11:40Z")

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We are excited to announce the second beta release of ITK 6.0! This release introduces modern CMake module targets — a major build system modernization that makes it easier than ever to link ITK into your projects. Along…

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## [SimpleITK 3.0.0 Alpha 3](https://discourse.itk.org/t/simpleitk-3-0-0-alpha-3/7733)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 5\
**Last updated:** [March 19, 2026, 10:10am UTC](https://discourse.itk.org/t/simpleitk-3-0-0-alpha-3/7733 "2026-03-19T10:10:54Z")

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Release Notes for SimpleITK v3.0.0 Alpha Release 3 This is the third Alpha Release of SimpleITK 3.0. It covers changes since v3.0.0a1 (September 2025), including v3.0.0a2. Significant work has been done on the Python pa…

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## [Current path to adding an ITK remote module](https://discourse.itk.org/t/current-path-to-adding-an-itk-remote-module/7730)

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**Author:** [@mattcieslak](https://discourse.itk.org/u/mattcieslak)\
**Replies:** 5\
**Last updated:** [March 10, 2026, 7:27pm UTC](https://discourse.itk.org/t/current-path-to-adding-an-itk-remote-module/7730 "2026-03-10T19:27:13Z")

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Hi! We’ve been trying to establish a standard file format for tractography/streamlines data ( tee-ar-ex · GitHub ) and as part of that I’ve been working on an ITK remote module that provides I/O and ITK-style interfaces.…

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## [libminc build error](https://discourse.itk.org/t/libminc-build-error/7723)

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**Author:** [@gregsharp](https://discourse.itk.org/u/gregsharp)\
**Replies:** 4\
**Last updated:** [March 5, 2026, 7:34pm UTC](https://discourse.itk.org/t/libminc-build-error/7723 "2026-03-05T19:34:08Z")

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Hi all, I’m trying to build ITK 5.4.5 (stable) from source on Debian Forky. Any idea the cause for this error? \[ 93%\] Building C object Modules/ThirdParty/MINC/src/libminc/CMakeFiles/itkminc2.dir/libcommon/ParseArgv.c…

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## [Enable long path compilation](https://discourse.itk.org/t/enable-long-path-compilation/2691)

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**Author:** [@Thibault](https://discourse.itk.org/u/Thibault)\
**Replies:** 13\
**Last updated:** [March 5, 2026, 6:30pm UTC](https://discourse.itk.org/t/enable-long-path-compilation/2691 "2026-03-05T18:30:21Z")

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Hi, First time here. I was facing the fact that you have deactivated the compilation for long path on windows 10 even if we enabled long path in GPO. See this commit: In your discussion about that issue, I have noti…

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## [How to best handle itk::Math::Absolute](https://discourse.itk.org/t/how-to-best-handle-itk-absolute/7724)

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**Author:** [@simon.rit](https://discourse.itk.org/u/simon.rit)\
**Replies:** 2\
**Last updated:** [March 5, 2026, 2:13pm UTC](https://discourse.itk.org/t/how-to-best-handle-itk-absolute/7724 "2026-03-05T14:13:02Z")

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The recent PR 5802 has triggered a bunch of new warnings in RTK because “std::abs() returns the absolute value in the same type as the input, itk::Math::Absolute() returns the absolute value in the unsigned equivalent o…

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## [angle constrain](https://discourse.itk.org/t/angle-constrain/7718)

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**Author:** [@Chat\_Gpt](https://discourse.itk.org/u/Chat_Gpt)\
**Replies:** 3\
**Last updated:** [March 2, 2026, 1:37pm UTC](https://discourse.itk.org/t/angle-constrain/7718 "2026-03-02T13:37:06Z")

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Hi, Is it possible to constrain the rotational angles in Euler3DTransform? If so then what is the way for imposing lower and upper bounds on rotational angles within an Euler3DTransform object during a registration proc…

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## [Intermittent SIGSEGV in SignedMaurerDistanceMap](https://discourse.itk.org/t/intermittent-sigsegv-in-signedmaurerdistancemap/7714)

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**Author:** [@e\_s](https://discourse.itk.org/u/e_s)\
**Replies:** 8\
**Last updated:** [February 25, 2026, 5:54pm UTC](https://discourse.itk.org/t/intermittent-sigsegv-in-signedmaurerdistancemap/7714 "2026-02-25T17:54:01Z")

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Hello Everyone. I am experiencing an intermittent Segmentation Fault while using the itk::simple::SignedMaurerDistanceMap() function. Environment SimpleITK 2.4 (ITK 5.4), Ubuntu 24 with intel oneAPI 2025.1 (icpx) comp…

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## [Proposing \`ImageConstIterator::ComputeIndex()\`, a clearer alternative to GetIndex()](https://discourse.itk.org/t/proposing-imageconstiterator-computeindex-a-clearer-alternative-to-getindex/7711)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 5\
**Last updated:** [February 13, 2026, 11:38pm UTC](https://discourse.itk.org/t/proposing-imageconstiterator-computeindex-a-clearer-alternative-to-getindex/7711 "2026-02-13T23:38:48Z")

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Of course, I very much encourage using the new iterator ranges, introduced with ITK 5 (ImageBufferRange, ImageRegionRange, ShapedImageNeighborhoodRange, IndexRange). But I have to admit that “traditional” ITK iterators l…

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## [build fails on Windows 64](https://discourse.itk.org/t/build-fails-on-windows-64/7706)

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**Author:** [@jsemeda](https://discourse.itk.org/u/jsemeda)\
**Replies:** 17\
**Last updated:** [February 12, 2026, 10:08pm UTC](https://discourse.itk.org/t/build-fails-on-windows-64/7706 "2026-02-12T22:08:25Z")

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I am trying to build sitk on Windows 64 but the build fails. Using cmake for windows it generates only utility projects. I can see some libraries have been built, but no generated header files. The file “SimpleITKBasicFi…

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## [N4 bias field correction of 4D images](https://discourse.itk.org/t/n4-bias-field-correction-of-4d-images/7710)

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**Author:** [@nolog](https://discourse.itk.org/u/nolog)\
**Replies:** 10\
**Last updated:** [February 12, 2026, 8:52pm UTC](https://discourse.itk.org/t/n4-bias-field-correction-of-4d-images/7710 "2026-02-12T20:52:41Z")

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Hello everyone, I am trying to perform a bias field correction on a 4D echo series that is used for quantitative MRI. There is significant B0 inhomogeneity which, on a single echo basis, I am able to correct for via the…

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## [A static variable in itkNiftiImageIO.cxx](https://discourse.itk.org/t/a-static-variable-in-itkniftiimageio-cxx/7698)

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**Author:** [@Liming\_Zhou](https://discourse.itk.org/u/Liming_Zhou)\
**Replies:** 3\
**Last updated:** [February 12, 2026, 11:48am UTC](https://discourse.itk.org/t/a-static-variable-in-itkniftiimageio-cxx/7698 "2026-02-12T11:48:39Z")

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static std::string prev; if (prev != this-\>GetFileName()) { #if defined(ITK\_USE\_VERY\_VERBOSE\_NIFTI\_DEBUGGING) DumpNiftiHeader(this-\>GetFileName()); #endif prev = this-\>GetFileName(); } this “prev” useless maybe, d…

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## [Sobel operator extended for 4D, legacy support for 3D, OK?](https://discourse.itk.org/t/sobel-operator-extended-for-4d-legacy-support-for-3d-ok/7699)

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**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 4\
**Last updated:** [February 4, 2026, 2:24pm UTC](https://discourse.itk.org/t/sobel-operator-extended-for-4d-legacy-support-for-3d-ok/7699 "2026-02-04T14:24:03Z")

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Please have a look at my pull request, which aims to improve our SobelOperator, and add ND support (including 4D): I think it is ready, but there are a few things to consider: The proposed new implementation of Sob…

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## [Registration fails if the moving image is translated](https://discourse.itk.org/t/registration-fails-if-the-moving-image-is-translated/7701)

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**Author:** [@Vasily\_Postnicov](https://discourse.itk.org/u/Vasily_Postnicov)\
**Replies:** 2\
**Last updated:** [February 3, 2026, 3:43am UTC](https://discourse.itk.org/t/registration-fails-if-the-moving-image-is-translated/7701 "2026-02-03T03:43:09Z")

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Hi! I am trying to do different kinds of image registration with ITK (not simpleitk). I attach the code I use (it’s from one of the examples with small modifications). itk.cpp (6.1 KB) I use the Euler3DTransform model …

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## [python SimpleITK and parallelism](https://discourse.itk.org/t/python-simpleitk-and-parallelism/7678)

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**Author:** [@gdevenyi](https://discourse.itk.org/u/gdevenyi)\
**Replies:** 4\
**Last updated:** [January 30, 2026, 3:15pm UTC](https://discourse.itk.org/t/python-simpleitk-and-parallelism/7678 "2026-01-30T15:15:28Z")

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Following up on Running optimizer in parallel - #7 by blowekamp I wanted to ask ask about the interaction between python parallelism and SimpleITK. I’ve successfully wrapped the calls I need from SimpleITK in concurrent…

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## [SimpleITK CompositeTransform versus antsApplyTransform -- Order Documentation Wrong?](https://discourse.itk.org/t/simpleitk-compositetransform-versus-antsapplytransform-order-documentation-wrong/7700)

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**Author:** [@gdevenyi](https://discourse.itk.org/u/gdevenyi)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 3:38pm UTC](https://discourse.itk.org/t/simpleitk-compositetransform-versus-antsapplytransform-order-documentation-wrong/7700 "2026-01-13T15:38:25Z")

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The SimpleITK transform documentation and examples states: This appears to be the same as the documentation for antsApplyTransforms: An identity transform is pushed onto the transformation stack. Each new transfor…

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## [LBFGS/LBFGSB optimizerv4 crash in Multi-threaded application](https://discourse.itk.org/t/lbfgs-lbfgsb-optimizerv4-crash-in-multi-threaded-application/7695)

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**Author:** [@Liming\_Zhou](https://discourse.itk.org/u/Liming_Zhou)\
**Replies:** 2\
**Last updated:** [January 9, 2026, 2:19am UTC](https://discourse.itk.org/t/lbfgs-lbfgsb-optimizerv4-crash-in-multi-threaded-application/7695 "2026-01-09T02:19:10Z")

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This optimizer is not threading safe, so when I run two(or more) threads simultaneously containing this optimizer, the results are irreproducible, and may even crash at different breakpoints. When I switch to other kind…

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## [Groupwise registration in SimpleITK or ITKElastix flipping images?](https://discourse.itk.org/t/groupwise-registration-in-simpleitk-or-itkelastix-flipping-images/7694)

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**Author:** [@Rock](https://discourse.itk.org/u/Rock)\
**Replies:** 1\
**Last updated:** [January 7, 2026, 7:59pm UTC](https://discourse.itk.org/t/groupwise-registration-in-simpleitk-or-itkelastix-flipping-images/7694 "2026-01-07T19:59:05Z")

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Hello, I am trying to run groupwise registrations in SimpleITK and ITKElastix, but with either the resulting images just seem to be flipped vertically. My original images are .tifs; I converted them to grayscale and the…

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