# \#extensions

**URL:** https://discourse.slicer.org/tag/extensions/427.md

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

---

## [New extension: OMEZarr - open OME-Zarr images directly in Slicer](https://discourse.slicer.org/t/new-extension-omezarr-open-ome-zarr-images-directly-in-slicer/48238)

<div class="topic-metadata">

**Author:** [@vboussot](https://discourse.slicer.org/u/vboussot)\
**Replies:** 5\
**Last updated:** [September 23, 2026, 5:23pm UTC](https://discourse.slicer.org/t/new-extension-omezarr-open-ome-zarr-images-directly-in-slicer/48238 "2026-09-23T17:23:04Z")

</div>

Hi all, We’re happy to announce OMEZarr, a new extension from Fideus Labs that opens and saves OME-Zarr images. It is available in the Extensions Manager for Slicer 5.12.4 and the Preview release, on Linux, macOS and Wi…

---

## [Applying boundary constraints to DRR volumes in SlicerAutoscoperM](https://discourse.slicer.org/t/applying-boundary-constraints-to-drr-volumes-in-slicerautoscoperm/48106)

<div class="topic-metadata">

**Author:** [@Dorte](https://discourse.slicer.org/u/Dorte)\
**Replies:** 1\
**Last updated:** [September 10, 2026, 7:22am UTC](https://discourse.slicer.org/t/applying-boundary-constraints-to-drr-volumes-in-slicerautoscoperm/48106 "2026-09-10T07:22:41Z")

</div>

Hello Slicer team and Slicer community, I’m working with monoplanar videoradiography, and I’m trying to reduce depth ambiguity during bone tracking. I was wondering whether SlicerAutoscoperM allows applying geometric o…

---

## [Advice on cleaning up incredibly noisy segmentations](https://discourse.slicer.org/t/advice-on-cleaning-up-incredibly-noisy-segmentations/47837)

<div class="topic-metadata">

**Author:** [@Chelonian](https://discourse.slicer.org/u/Chelonian)\
**Replies:** 6\
**Last updated:** [August 16, 2026, 6:37pm UTC](https://discourse.slicer.org/t/advice-on-cleaning-up-incredibly-noisy-segmentations/47837 "2026-08-16T18:37:54Z")

</div>

I’m trying to segment the internals of some incredibly noisy CT scans. example of what I’m working with I’ve managed to segment the intestines but I’m not happy at all with the quality of the segments or the amount of…

---

## [Measuring per-tooth displacement between serial intraoral scans - which modules?](https://discourse.slicer.org/t/measuring-per-tooth-displacement-between-serial-intraoral-scans-which-modules/47723)

<div class="topic-metadata">

**Author:** [@Alla\_Belova](https://discourse.slicer.org/u/Alla_Belova)\
**Replies:** 2\
**Last updated:** [July 25, 2026, 4:15pm UTC](https://discourse.slicer.org/t/measuring-per-tooth-displacement-between-serial-intraoral-scans-which-modules/47723 "2026-07-25T16:15:56Z")

</div>

Hi all — I’m a dentist working on a PhD metrology project and I kindly ask for your help to build an efficient protocol for measuring tooth displacement in time. The data: five surface meshes (STL) of the same mandibula…

---

## [Stereo Off-Axis Projection and Mouse Interactions](https://discourse.slicer.org/t/stereo-off-axis-projection-and-mouse-interactions/47552)

<div class="topic-metadata">

**Author:** [@LucasP](https://discourse.slicer.org/u/LucasP)\
**Replies:** 4\
**Last updated:** [July 14, 2026, 6:22pm UTC](https://discourse.slicer.org/t/stereo-off-axis-projection-and-mouse-interactions/47552 "2026-07-14T18:22:48Z")

</div>

:robot: This post was written with AI assistance. But I’m still human Hi, I’m new to 3D Slicer and VTK. I am trying to build a “virtual window” effect using a custom stereo display that gives me real-time viewDistanc…

---

## [Workflow for segmenting many lesions as separate segments?](https://discourse.slicer.org/t/workflow-for-segmenting-many-lesions-as-separate-segments/47094)

<div class="topic-metadata">

**Author:** [@zhousy5310](https://discourse.slicer.org/u/zhousy5310)\
**Replies:** 5\
**Last updated:** [July 8, 2026, 8:56am UTC](https://discourse.slicer.org/t/workflow-for-segmenting-many-lesions-as-separate-segments/47094 "2026-07-08T08:56:49Z")

</div>

Hi all, I’m currently working on NF1 cases using Slicer, and trying to find a better workflow. The main difficulty is not segmenting one lesion, but handling many separate lesions efficiently while keeping them as diff…

---

## [Talk2View Community sub-topic](https://discourse.slicer.org/t/talk2view-community-sub-topic/47062)

<div class="topic-metadata">

**Author:** [@benzwick](https://discourse.slicer.org/u/benzwick)\
**Replies:** 2\
**Last updated:** [May 18, 2026, 6:28am UTC](https://discourse.slicer.org/t/talk2view-community-sub-topic/47062 "2026-05-18T06:28:04Z")

</div>

Is there any chance we could make a sub-topic for Talk2View? Talk2View, “the medical viewer you can talk to”, is available as a 3D Slicer Extension or as a 3D Slicer Custom Application. We also have an OHIF version at h…

---

## [New extension pull request awaiting approval](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780)

<div class="topic-metadata">

**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\
**Replies:** 4\
**Last updated:** [April 22, 2026, 4:58pm UTC](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780 "2026-04-22T16:58:12Z")

</div>

I recently got my BoneMat extension to a useful state and decided to try adding it to the extensions index. My first pull request to the ExtensionsIndex didn’t pass the extension validation test (which was initiated by a…

---

## [OpenDose3D module is not loaded](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045)

<div class="topic-metadata">

**Author:** [@Huihui](https://discourse.slicer.org/u/Huihui)\
**Replies:** 6\
**Last updated:** [April 13, 2026, 12:48am UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045 "2026-04-13T00:48:53Z")

</div>

Hi there, I’m trying to install OpedDose3D extension, but the module can not be loaded. Could anyone please help me? Thanks! Operating system: Windows Slicer version: 5.6.0 Expected behavior: Actual behavior:

---

## [Mac extension builds failing with cout error](https://discourse.slicer.org/t/mac-extension-builds-failing-with-cout-error/46685)

<div class="topic-metadata">

**Author:** [@pieper](https://discourse.slicer.org/u/pieper)\
**Replies:** 14\
**Last updated:** [April 10, 2026, 7:20pm UTC](https://discourse.slicer.org/t/mac-extension-builds-failing-with-cout-error/46685 "2026-04-10T19:20:50Z")

</div>

We noticed SlicerDMRI and other mac builds today. Looks like python extensions are okay but not C++ ones. Maybe related to the clipboard locale change? @Sam\_Horvath @ebrahim ?

---

## [Viewing / Analysing RT Plans / Fields](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683)

<div class="topic-metadata">

**Author:** [@AlexB](https://discourse.slicer.org/u/AlexB)\
**Replies:** 4\
**Last updated:** [April 9, 2026, 3:27am UTC](https://discourse.slicer.org/t/viewing-analysing-rt-plans-fields/46683 "2026-04-09T03:27:02Z")

</div>

Greetings, dear community! First off, thanks for this project–and for actively maintaining it. Now, I’d like to know if the program would cover my use-case, namely: Visualise dose distributions (in colour-wash mode) S…

---

## [Publishing a new Slicer Python extension](https://discourse.slicer.org/t/publishing-a-new-slicer-python-extension/46506)

<div class="topic-metadata">

**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\
**Replies:** 1\
**Last updated:** [March 19, 2026, 9:19pm UTC](https://discourse.slicer.org/t/publishing-a-new-slicer-python-extension/46506 "2026-03-19T21:19:50Z")

</div>

Hi all, I’ve been developing a Slicer extension in Python over the past 6 months to perform material mapping of Young’s modulus onto meshes from CT data, using Dr Elise Pegg’s project to perform the main material mappin…

---

## [📢 New 3D Slicer Extensions: KonfAI & IMPACT-Synth Reliable AI Synthetic CT and Segmentation with Integrated QA](https://discourse.slicer.org/t/new-3d-slicer-extensions-konfai-impact-synth-reliable-ai-synthetic-ct-and-segmentation-with-integrated-qa/46032)

<div class="topic-metadata">

**Author:** [@vboussot](https://discourse.slicer.org/u/vboussot)\
**Replies:** 0\
**Last updated:** [February 2, 2026, 2:55pm UTC](https://discourse.slicer.org/t/new-3d-slicer-extensions-konfai-impact-synth-reliable-ai-synthetic-ct-and-segmentation-with-integrated-qa/46032 "2026-02-02T14:55:13Z")

</div>

Dear All, We are happy to announce the release of two new open-source 3D Slicer extensions, KonfAI and IMPACT-Synth, which provide graphical interfaces to run AI tasks (such as segmentation and synthetic CT generation) …

---

## [BoneThicknessMapping does not work](https://discourse.slicer.org/t/bonethicknessmapping-does-not-work/30738)

<div class="topic-metadata">

**Author:** [@Yanglab](https://discourse.slicer.org/u/Yanglab)\
**Replies:** 1\
**Last updated:** [January 29, 2026, 7:15pm UTC](https://discourse.slicer.org/t/bonethicknessmapping-does-not-work/30738 "2026-01-29T19:15:45Z")

</div>

Hi guys, I’m try to use bone thickness mapping on my own data and demo data (Predentalsurgery). But none of them worked. The status kept showing Initializing execution, and the process was permanantly 0%. When I check…

---

## [nnInteractive module no longer segments properly](https://discourse.slicer.org/t/nninteractive-module-no-longer-segments-properly/45914)

<div class="topic-metadata">

**Author:** [@lukejprose](https://discourse.slicer.org/u/lukejprose)\
**Replies:** 11\
**Last updated:** [January 27, 2026, 3:33am UTC](https://discourse.slicer.org/t/nninteractive-module-no-longer-segments-properly/45914 "2026-01-27T03:33:09Z")

</div>

I have been using the nnInteractive module through MorphoCloud to segment CT scans of fish skulls, with a good bit of success. Now, however, the nnInteractive module no longer functions properly. The Configuration tab sa…

---

## [Slicer Build Environment Upgraded to \`qt5-almalinux8-gcc14\`](https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802)

<div class="topic-metadata">

**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 12\
**Last updated:** [December 16, 2025, 4:05pm UTC](https://discourse.slicer.org/t/slicer-build-environment-upgraded-to-qt5-almalinux8-gcc14/43802 "2025-12-16T16:05:20Z")

</div>

The build environment used for generating Slicer Preview and its extensions has been upgraded from qt5-centos7-gcc7 to qt5-almalinux8-gcc14. This update brings improved C++ standards support, better compatibility with m…

---

## [Additional module path disappears after restart](https://discourse.slicer.org/t/additional-module-path-disappears-after-restart/45357)

<div class="topic-metadata">

**Author:** [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Replies:** 11\
**Last updated:** [December 10, 2025, 12:02am UTC](https://discourse.slicer.org/t/additional-module-path-disappears-after-restart/45357 "2025-12-10T00:02:25Z")

</div>

I am adding a new module directory via application settings, but after restart, the added directory disappears. There are no errors relevant to this during application startup. I observe this with both 5.10 and nightly. …

---

## [Writing a Scripted Subject Hierarchy Plugin -- documentation lacking](https://discourse.slicer.org/t/writing-a-scripted-subject-hierarchy-plugin-documentation-lacking/45252)

<div class="topic-metadata">

**Author:** [@shai-ikko](https://discourse.slicer.org/u/shai-ikko)\
**Replies:** 2\
**Last updated:** [December 3, 2025, 4:18pm UTC](https://discourse.slicer.org/t/writing-a-scripted-subject-hierarchy-plugin-documentation-lacking/45252 "2025-12-03T16:18:40Z")

</div>

Hi, Recently I’ve been writing an internal-use Subject Hierarchy plugin. I ran into some difficulties that stem, IMO, from lacking documentation, so I want to share what I’ve learned with a view to getting some comments…

---

## [New extension: Slicer-trame - Bringing 3D Slicer to the web](https://discourse.slicer.org/t/new-extension-slicer-trame-bringing-3d-slicer-to-the-web/45298)

<div class="topic-metadata">

**Author:** [@Thibault\_Pelletier](https://discourse.slicer.org/u/Thibault_Pelletier)\
**Replies:** 0\
**Last updated:** [December 1, 2025, 9:32pm UTC](https://discourse.slicer.org/t/new-extension-slicer-trame-bringing-3d-slicer-to-the-web/45298 "2025-12-01T21:32:11Z")

</div>

The Slicer trame extension is now available in Slicer 5.10 and allows to create modern web applications while leveraging 3D Slicer’s core functionalities. The extension is built on top of 3D Slicer python’s wrapping …

---

## [Adding a library to a custom loadable module](https://discourse.slicer.org/t/adding-a-library-to-a-custom-loadable-module/44945)

<div class="topic-metadata">

**Author:** [@Suhaim](https://discourse.slicer.org/u/Suhaim)\
**Replies:** 1\
**Last updated:** [November 5, 2025, 8:48am UTC](https://discourse.slicer.org/t/adding-a-library-to-a-custom-loadable-module/44945 "2025-11-05T08:48:12Z")

</div>

Hi, I wanted some support on adding a library in my custom loadable module. This is my cmake for adding a library called “SystemChecker” which is inside a directory called “SystemCheck”. The library is building correc…

---

## [Binary is missing from the extension package](https://discourse.slicer.org/t/binary-is-missing-from-the-extension-package/44832)

<div class="topic-metadata">

**Author:** [@fedorov](https://discourse.slicer.org/u/fedorov)\
**Replies:** 2\
**Last updated:** [October 21, 2025, 6:42pm UTC](https://discourse.slicer.org/t/binary-is-missing-from-the-extension-package/44832 "2025-10-21T18:42:07Z")

</div>

We have a situation where one (and only one!) of the binaries that are build as part of the dcmqi extension is missing, only on Mac. For example, see this build: SlicerPreview . There are no build errors, but segimage2it…

---

## [New Extension: MassVision](https://discourse.slicer.org/t/new-extension-massvision/44540)

<div class="topic-metadata">

**Author:** [@Amoon](https://discourse.slicer.org/u/Amoon)\
**Replies:** 0\
**Last updated:** [September 21, 2025, 2:28am UTC](https://discourse.slicer.org/t/new-extension-massvision/44540 "2025-09-21T02:28:12Z")

</div>

:rocket: Happy to announce the official release of MassVision extension v 1.0, now available through the 3D Slicer Extension Manager (compatible with the latest stable release, v5.8.1). :light\_bulb: MassVision is an end…

---

## [Adding near-real time collaborative manual segmentation](https://discourse.slicer.org/t/adding-near-real-time-collaborative-manual-segmentation/29255)

<div class="topic-metadata">

**Author:** [@kchawla-pi](https://discourse.slicer.org/u/kchawla-pi)\
**Replies:** 5\
**Last updated:** [August 29, 2025, 6:20pm UTC](https://discourse.slicer.org/t/adding-near-real-time-collaborative-manual-segmentation/29255 "2025-08-29T18:20:10Z")

</div>

I am looking into building a plugin to collaboratively annotate and segment sMRI. The idea is that we can invite specific people via email and they (and only they) can all join and collaborate a volume as a team via a lo…

---

## [Missing prebuilds for IGT extensions for Preview Release 5.9](https://discourse.slicer.org/t/missing-prebuilds-for-igt-extensions-for-preview-release-5-9/44143)

<div class="topic-metadata">

**Author:** [@ruffsl](https://discourse.slicer.org/u/ruffsl)\
**Replies:** 13\
**Last updated:** [August 28, 2025, 2:42pm UTC](https://discourse.slicer.org/t/missing-prebuilds-for-igt-extensions-for-preview-release-5-9/44143 "2025-08-28T14:42:20Z")

</div>

Hello, I’m developing slicelet for image guided therapy, particularly a scripted slicelet for simpler R&D. Ideally we’d like to use the Preview Release of Slicer 5.9 that ships with a more recent version of Python 3.12, …

---

## [Programmatically controlling extensions via separate scripted extension](https://discourse.slicer.org/t/programmatically-controlling-extensions-via-separate-scripted-extension/44154)

<div class="topic-metadata">

**Author:** [@ruffsl](https://discourse.slicer.org/u/ruffsl)\
**Replies:** 3\
**Last updated:** [August 21, 2025, 9:00pm UTC](https://discourse.slicer.org/t/programmatically-controlling-extensions-via-separate-scripted-extension/44154 "2025-08-21T21:00:10Z")

</div>

Is it possible to programmatically control the state of other 3D Slicer extensions via my own scripted extension using the python API? Such as trigger UI events or update their internal state? E.g: when restoring Slicer…

---

## [How versatile is the HD Brain Extraction extension?](https://discourse.slicer.org/t/how-versatile-is-the-hd-brain-extraction-extension/43426)

<div class="topic-metadata">

**Author:** [@sulli419](https://discourse.slicer.org/u/sulli419)\
**Replies:** 1\
**Last updated:** [July 21, 2025, 8:40pm UTC](https://discourse.slicer.org/t/how-versatile-is-the-hd-brain-extraction-extension/43426 "2025-07-21T20:40:43Z")

</div>

Hi, I am wondering how well the HD Brain Extraction extension might work on anatomical scans of mouse brains. Has anyone tried this? Were any efforts made to make this trained model more robust/generalizable/versatile…

---

## [Cannot find libraries when loading custom loadable extension because of versioning](https://discourse.slicer.org/t/cannot-find-libraries-when-loading-custom-loadable-extension-because-of-versioning/43582)

<div class="topic-metadata">

**Author:** [@glso](https://discourse.slicer.org/u/glso)\
**Replies:** 1\
**Last updated:** [July 2, 2025, 5:00pm UTC](https://discourse.slicer.org/t/cannot-find-libraries-when-loading-custom-loadable-extension-because-of-versioning/43582 "2025-07-02T17:00:32Z")

</div>

Hi, I built a loadable extension which builds and runs successfully on my Slicer-Release (5.9), built from source code on x86\_64 architecture on MacOS. My CMake version is 3.22.6. I wanted to package the extension so t…

---

## [Slicer with custom Python threading crashing unpredictably](https://discourse.slicer.org/t/slicer-with-custom-python-threading-crashing-unpredictably/43077)

<div class="topic-metadata">

**Author:** [@pedr0sorio](https://discourse.slicer.org/u/pedr0sorio)\
**Replies:** 6\
**Last updated:** [June 18, 2025, 3:11am UTC](https://discourse.slicer.org/t/slicer-with-custom-python-threading-crashing-unpredictably/43077 "2025-06-18T03:11:03Z")

</div>

Dear Slicer Community, I have been building a custom slicer extension that allows me to do localised modifications in a CT scan using some AI models running in a Flask server that I access with requests. The extension …

---

## [Configuring the running environment for an extension build-tree](https://discourse.slicer.org/t/configuring-the-running-environment-for-an-extension-build-tree/43103)

<div class="topic-metadata">

**Author:** [@RafaelPalomar](https://discourse.slicer.org/u/RafaelPalomar)\
**Replies:** 1\
**Last updated:** [May 26, 2025, 8:02pm UTC](https://discourse.slicer.org/t/configuring-the-running-environment-for-an-extension-build-tree/43103 "2025-05-26T20:02:19Z")

</div>

Hello. Is there any reason for the following code not taking effect when added to a External\_something.cmake file in a superbuild extension? set(${proj}\_ENVVARS\_LAUNCHER\_BUILD "VAR1=${VAR1}" "VAR2=anything" …

---

## [When creating a extension using Slicer5.9, I've found that the only available type options are "default" and "superbuild".](https://discourse.slicer.org/t/when-creating-a-extension-using-slicer5-9-ive-found-that-the-only-available-type-options-are-default-and-superbuild/42963)

<div class="topic-metadata">

**Author:** [@zhaokaien](https://discourse.slicer.org/u/zhaokaien)\
**Replies:** 4\
**Last updated:** [May 18, 2025, 11:40am UTC](https://discourse.slicer.org/t/when-creating-a-extension-using-slicer5-9-ive-found-that-the-only-available-type-options-are-default-and-superbuild/42963 "2025-05-18T11:40:53Z")

</div>

I have successfully built Slicer using the 5.9 source code. However, when I use the generated Slicer application and try to create an extension, in the Extension Wizard interface, I only see two options for “Type” when c…

[Next page](https://discourse.slicer.org/tag/extensions/427.md?match_all_tags=true&page=1&tags%5B%5D=extensions)