# Latest

**URL:** https://discourse.slicer.org/latest.md?page=11

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

**Page:** 12

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## [Segmenting individual lobes in an abnormal brain (with hydrocephalus)](https://discourse.slicer.org/t/segmenting-individual-lobes-in-an-abnormal-brain-with-hydrocephalus/47275)

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**Author:** [@Preetham\_Dange](https://discourse.slicer.org/u/Preetham_Dange)\
**Replies:** 6\
**Last updated:** [June 8, 2026, 8:35pm UTC](https://discourse.slicer.org/t/segmenting-individual-lobes-in-an-abnormal-brain-with-hydrocephalus/47275 "2026-06-08T20:35:50Z")

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Hello everyone, I am currently working on hydrocephalus . I need do segment the lobes of the brain in MRI of children with hydrocephalus . I saw a few extensions on 3D slicer and some sites like VolBrain but they are on…

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## [Adding landmarks using Point List results in screen glitches](https://discourse.slicer.org/t/adding-landmarks-using-point-list-results-in-screen-glitches/47173)

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**Author:** [@thelobsternods](https://discourse.slicer.org/u/thelobsternods)\
**Replies:** 5\
**Last updated:** [June 8, 2026, 6:40pm UTC](https://discourse.slicer.org/t/adding-landmarks-using-point-list-results-in-screen-glitches/47173 "2026-06-08T18:40:49Z")

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We have been using the same protocol for adding landmarks to 3D models for years, but are suddenly experiencing issues with our established protocol. Specifically, we only have this problem after starting a new “point li…

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## [Markups nodes: enabling measurements may propagate on newer nodes](https://discourse.slicer.org/t/markups-nodes-enabling-measurements-may-propagate-on-newer-nodes/47269)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 4\
**Last updated:** [June 7, 2026, 7:24pm UTC](https://discourse.slicer.org/t/markups-nodes-enabling-measurements-may-propagate-on-newer-nodes/47269 "2026-06-07T19:24:12Z")

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I am seeing an unexpected behaviour regarding the display of measurements in markups nodes, in all versions of Slicer on Linux. Start 5.10 stable for instance: draw a Closed curve node: no measurement is displayed go …

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## [How to measure area of visceral and subcutaneous visceral fat on a single CT image (L3 level)?](https://discourse.slicer.org/t/how-to-measure-area-of-visceral-and-subcutaneous-visceral-fat-on-a-single-ct-image-l3-level/47262)

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**Author:** [@Alexandre\_Bezerra](https://discourse.slicer.org/u/Alexandre_Bezerra)\
**Replies:** 1\
**Last updated:** [June 7, 2026, 12:00pm UTC](https://discourse.slicer.org/t/how-to-measure-area-of-visceral-and-subcutaneous-visceral-fat-on-a-single-ct-image-l3-level/47262 "2026-06-07T12:00:15Z")

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Hello! is there an automatic or simple way to measure the area visceral and subcutaneous fat on a single CT slice? I am able to calculate the volume of fat on all slices of an exam, but can´t seem to find a way to select…

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## [NDI Polaris Lyra + 3D Slicer OpenIGTLink: How to Keep Registration Valid After Moving the Phantom?](https://discourse.slicer.org/t/ndi-polaris-lyra-3d-slicer-openigtlink-how-to-keep-registration-valid-after-moving-the-phantom/47234)

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**Author:** [@AdamDomafoldi](https://discourse.slicer.org/u/AdamDomafoldi)\
**Replies:** 4\
**Last updated:** [June 6, 2026, 5:14pm UTC](https://discourse.slicer.org/t/ndi-polaris-lyra-3d-slicer-openigtlink-how-to-keep-registration-valid-after-moving-the-phantom/47234 "2026-06-06T17:14:57Z")

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Hello, I have been experimenting with the NDI Polaris Lyra and Slicer OpenIGTLink. I have read all the documentation and, after numerous attempts, I think I have some parts working, but I would like to ask for help. Wh…

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## [3D rendering makes whole screen glitch](https://discourse.slicer.org/t/3d-rendering-makes-whole-screen-glitch/46520)

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**Author:** [@naomic2](https://discourse.slicer.org/u/naomic2)\
**Replies:** 3\
**Last updated:** [June 5, 2026, 4:31pm UTC](https://discourse.slicer.org/t/3d-rendering-makes-whole-screen-glitch/46520 "2026-06-05T16:31:22Z")

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When I’m in Segmentation Editor and I press “Show 3D” the screen glitches between something like this image and normal. When I have all of my segments deselected with Show 3D on, the screen is also normal. I’m not rea…

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## [Reimplementation of 3D slicer CPR using pure VTK](https://discourse.slicer.org/t/reimplementation-of-3d-slicer-cpr-using-pure-vtk/46316)

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**Author:** [@S-Linh](https://discourse.slicer.org/u/S-Linh)\
**Replies:** 6\
**Last updated:** [June 5, 2026, 4:10pm UTC](https://discourse.slicer.org/t/reimplementation-of-3d-slicer-cpr-using-pure-vtk/46316 "2026-06-05T16:10:02Z")

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Hello everyone, I’m trying to develop 3d Slicer Curve Planar Reformation in my own PACS Viewer, specifically OHIF: I’m looking to use VTK Wasm to implement this. My question is: Since Slicer’s CPR extension is made …

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## [Bump minimum CMake version to 3.28.1?](https://discourse.slicer.org/t/bump-minimum-cmake-version-to-3-28-1/47247)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 0\
**Last updated:** [June 5, 2026, 2:35pm UTC](https://discourse.slicer.org/t/bump-minimum-cmake-version-to-3-28-1/47247 "2026-06-05T14:35:30Z")

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CMake 3.28.1 shipped with Ubuntu 24.04 LTS. I suggest Slicer bumps it to that version after 5.12 is tagged. We are strongly considering the same bump in ITK. Please pitch in with your opinions.

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## [AMASSS issues - No nnUNET models found](https://discourse.slicer.org/t/amasss-issues-no-nnunet-models-found/47246)

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**Author:** [@manjula](https://discourse.slicer.org/u/manjula)\
**Replies:** 0\
**Last updated:** [June 5, 2026, 12:37pm UTC](https://discourse.slicer.org/t/amasss-issues-no-nnunet-models-found/47246 "2026-06-05T12:37:25Z")

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Dear All, I tried using AMASSS after fresh installation of both 3D Slicer stable version and latest preview release. No Conflicting extensions. (fresh install) However both version give the same error. I have run thi…

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## [Clarification on L3 SMA calculations and Pixel Spacing](https://discourse.slicer.org/t/clarification-on-l3-sma-calculations-and-pixel-spacing/47219)

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**Author:** [@merckins](https://discourse.slicer.org/u/merckins)\
**Replies:** 2\
**Last updated:** [June 4, 2026, 7:31am UTC](https://discourse.slicer.org/t/clarification-on-l3-sma-calculations-and-pixel-spacing/47219 "2026-06-04T07:31:29Z")

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Hello, I’m working on calculating CT L3 SMA, but some aspects are still unclear to me. I may be overlooking something, so I would really appreciate any feedback. I have original CT volumes with differing pixel spacings…

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## [Decrease file sizes](https://discourse.slicer.org/t/decrease-file-sizes/47224)

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**Author:** [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\
**Replies:** 2\
**Last updated:** [June 4, 2026, 12:21am UTC](https://discourse.slicer.org/t/decrease-file-sizes/47224 "2026-06-04T00:21:52Z")

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Hello, everyone. I’m trying to upload my ctscans, but the filles are really big, the resolution is too high. I wanna know how do you solve this kind of problem, How do you reduce file sizes without losing quality?

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## [Micro CT larvae with soft tissue](https://discourse.slicer.org/t/micro-ct-larvae-with-soft-tissue/47220)

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**Author:** [@Rin\_2529](https://discourse.slicer.org/u/Rin_2529)\
**Replies:** 4\
**Last updated:** [June 3, 2026, 11:27pm UTC](https://discourse.slicer.org/t/micro-ct-larvae-with-soft-tissue/47220 "2026-06-03T23:27:49Z")

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Hi everyone, I am working with micro-CT scans of mosquito larvae (~3.97 µm voxel size) and I am trying to generate rendered anatomical visualizations similar to the figures in this paper: https://www.nature.com/article…

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## [Invisible wall limiting segmentation](https://discourse.slicer.org/t/invisible-wall-limiting-segmentation/46973)

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**Author:** [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\
**Replies:** 4\
**Last updated:** [June 3, 2026, 8:46pm UTC](https://discourse.slicer.org/t/invisible-wall-limiting-segmentation/46973 "2026-06-03T20:46:07Z")

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Example Hello, everyone. I’m facing the same problem as in the video: I try to segment a specific region and it doesn’t work, it seems like there’s an invisible wall preventing me from segmenting that region even with…

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## [Mensure tooth torque](https://discourse.slicer.org/t/mensure-tooth-torque/47140)

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**Author:** [@Kevin\_Nguyen](https://discourse.slicer.org/u/Kevin_Nguyen)\
**Replies:** 2\
**Last updated:** [June 3, 2026, 5:52am UTC](https://discourse.slicer.org/t/mensure-tooth-torque/47140 "2026-06-03T05:52:56Z")

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Hello! I’m a dentist currently working on a project where I’m measuring tooth torque, specifically the angle of the root. I’m looking for some guidance regarding which tools and measurement methods would be most appropr…

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## [2026.06.02 Weekly Meeting](https://discourse.slicer.org/t/2026-06-02-weekly-meeting/47160)

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**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 4\
**Last updated:** [June 2, 2026, 9:34pm UTC](https://discourse.slicer.org/t/2026-06-02-weekly-meeting/47160 "2026-06-02T21:34:12Z")

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Title: 2026.06.02 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 11:00 AM ET until 12:00 PM ET. Anyone is welcome to join at this link: Launch Meeting - Zoom Agenda: Please post to this t…

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## [Division of the brain into individual parts](https://discourse.slicer.org/t/division-of-the-brain-into-individual-parts/47214)

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**Author:** [@Tedy](https://discourse.slicer.org/u/Tedy)\
**Replies:** 2\
**Last updated:** [June 2, 2026, 7:24pm UTC](https://discourse.slicer.org/t/division-of-the-brain-into-individual-parts/47214 "2026-06-02T19:24:37Z")

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Hi, can someone please help me cut out the brain parts from an MRI? I had a brain tumor and I want to make 3D models of the parts of my brain that were compressed by the tumor. It will help me come to terms with the dia…

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## [Ported mlx version of TotalSegmentator - Apple Silicon](https://discourse.slicer.org/t/ported-mlx-version-of-totalsegmentator-apple-silicon/47213)

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**Author:** [@pox\_got](https://discourse.slicer.org/u/pox_got)\
**Replies:** 0\
**Last updated:** [June 2, 2026, 2:58pm UTC](https://discourse.slicer.org/t/ported-mlx-version-of-totalsegmentator-apple-silicon/47213 "2026-06-02T14:58:22Z")

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Please check it out and provide feedback.

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## [How can I calculate dose-mass histograms and the impact of lung expansion](https://discourse.slicer.org/t/how-can-i-calculate-dose-mass-histograms-and-the-impact-of-lung-expansion/46997)

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**Author:** [@zahra\_Tabasi](https://discourse.slicer.org/u/zahra_Tabasi)\
**Replies:** 2\
**Last updated:** [June 2, 2026, 11:56am UTC](https://discourse.slicer.org/t/how-can-i-calculate-dose-mass-histograms-and-the-impact-of-lung-expansion/46997 "2026-06-02T11:56:56Z")

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Hello everyone, I am currently working on a research project involving unilateral left-sided breast cancer patients undergoing radiotherapy. My study compares Free Breathing (FB) and Deep Inspiration Breath Hold (DIBH) …

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## [3D Slicer crashes when using the Smoother during segmentation](https://discourse.slicer.org/t/3d-slicer-crashes-when-using-the-smoother-during-segmentation/47193)

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**Author:** [@Camilla](https://discourse.slicer.org/u/Camilla)\
**Replies:** 2\
**Last updated:** [June 2, 2026, 2:09am UTC](https://discourse.slicer.org/t/3d-slicer-crashes-when-using-the-smoother-during-segmentation/47193 "2026-06-02T02:09:19Z")

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3D Slicer crashes when using the Smoother during segmentation. The program is ‘thinking’ for a really long time and ultimately end up not responding and I have to start over. Any suggestions on why that happens? I’m t…

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## [Slicer 5.11.0 crashes immediately when switching to nnInteractive module](https://discourse.slicer.org/t/slicer-5-11-0-crashes-immediately-when-switching-to-nninteractive-module/47098)

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**Author:** [@aabrown100-git](https://discourse.slicer.org/u/aabrown100-git)\
**Replies:** 6\
**Last updated:** [June 1, 2026, 6:59am UTC](https://discourse.slicer.org/t/slicer-5-11-0-crashes-immediately-when-switching-to-nninteractive-module/47098 "2026-06-01T06:59:15Z")

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Using Slicer 5.11.0 on 2026 Macbook pro, M5 Pro chip. After installing the nnInteractive extension and restarting Slicer, when I switch to the nnInteractive module, it tries to install some dependencies. Almost immediat…

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## [Why won't my mrml file open in 3D slicer, or my stl file become visible?](https://discourse.slicer.org/t/why-wont-my-mrml-file-open-in-3d-slicer-or-my-stl-file-become-visible/47172)

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**Author:** [@Emerson](https://discourse.slicer.org/u/Emerson)\
**Replies:** 1\
**Last updated:** [May 29, 2026, 2:34pm UTC](https://discourse.slicer.org/t/why-wont-my-mrml-file-open-in-3d-slicer-or-my-stl-file-become-visible/47172 "2026-05-29T14:34:17Z")

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I was trying to open an mrml file I have saved, and while it opened the app it did not open the file or show up anywhere. I tried again with the stl file and while it showed up under ‘data’ (which is farther than I got w…

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## [3D Slicer Virtual Reality Experience with Meta Quest 3](https://discourse.slicer.org/t/3d-slicer-virtual-reality-experience-with-meta-quest-3/44542)

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**Author:** [@manjula](https://discourse.slicer.org/u/manjula)\
**Replies:** 6\
**Last updated:** [May 29, 2026, 1:27pm UTC](https://discourse.slicer.org/t/3d-slicer-virtual-reality-experience-with-meta-quest-3/44542 "2026-05-29T13:27:35Z")

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I’m writing to share my initial experience using the 3D Slicer VR extension with a Meta Quest 3 on Windows 11 and to ask for some guidance. My Setup: Headset: Meta Quest 3 PC OS: Windows 11 Connection Methods T…

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## [Next PW Prep meeting Tues Jun 2 at 10 AM ET](https://discourse.slicer.org/t/next-pw-prep-meeting-tues-jun-2-at-10-am-et/47164)

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**Author:** [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Replies:** 0\
**Last updated:** [May 28, 2026, 7:38pm UTC](https://discourse.slicer.org/t/next-pw-prep-meeting-tues-jun-2-at-10-am-et/47164 "2026-05-28T19:38:23Z")

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Dear Project Week community, The next project week preparation meeting will be next Tuesday, Jun 2, at 10:00 AM ET. (2026-06-02T14:00:00Z (UTC)) For this meeting, we will be discussing lung-related projects. If you are…

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## [Exporting DICOM perfusion/cine as NIfTI gives only 1 dynamic (but Slicer shows 150 frames)](https://discourse.slicer.org/t/exporting-dicom-perfusion-cine-as-nifti-gives-only-1-dynamic-but-slicer-shows-150-frames/47163)

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**Author:** [@Demy](https://discourse.slicer.org/u/Demy)\
**Replies:** 0\
**Last updated:** [May 28, 2026, 7:37pm UTC](https://discourse.slicer.org/t/exporting-dicom-perfusion-cine-as-nifti-gives-only-1-dynamic-but-slicer-shows-150-frames/47163 "2026-05-28T19:37:10Z")

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Hi everyone, I am loading a DICOM perfusion/cine MRI dataset into 3D Slicer. In the DICOM browser, the series summary shows: Modality: MR Size: 180 × 208 Count: 150 frames So Slicer correctly detects that t…

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## [Animator module not exporting in any format](https://discourse.slicer.org/t/animator-module-not-exporting-in-any-format/47153)

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**Author:** [@Atticus](https://discourse.slicer.org/u/Atticus)\
**Replies:** 6\
**Last updated:** [May 28, 2026, 4:41pm UTC](https://discourse.slicer.org/t/animator-module-not-exporting-in-any-format/47153 "2026-05-28T16:41:54Z")

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I have used the Animator module in the past to produce short animations of volumes rotating, being cropped to ROIs or changing their colors. I have not been able to export animations today, in any format or resolution, …

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## [Testing dashboard shows no tests executed when filtering is used](https://discourse.slicer.org/t/testing-dashboard-shows-no-tests-executed-when-filtering-is-used/47144)

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**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Replies:** 5\
**Last updated:** [May 28, 2026, 2:12pm UTC](https://discourse.slicer.org/t/testing-dashboard-shows-no-tests-executed-when-filtering-is-used/47144 "2026-05-28T14:12:31Z")

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Hi all, I wanted to look at the test results of some extensions today. First I thought that the factory machine does not run any tests, because filtering on SlicerRT I saw this (and I know the extension has around 70 te…

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## [How to convert a 4x4 matrix to inter-bone kinematic parameters](https://discourse.slicer.org/t/how-to-convert-a-4x4-matrix-to-inter-bone-kinematic-parameters/46986)

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**Author:** [@HHH](https://discourse.slicer.org/u/HHH)\
**Replies:** 3\
**Last updated:** [May 28, 2026, 1:59pm UTC](https://discourse.slicer.org/t/how-to-convert-a-4x4-matrix-to-inter-bone-kinematic-parameters/46986 "2026-05-28T13:59:11Z")

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Hello everyone, I am working on a knee joint registration project. According to the experience of predecessors, I have obtained a 4x4 matrix, but I am unable to calculate the kinematics of the knee joint. I am seeking he…

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## [Why aren't we building the extensions in parallel?](https://discourse.slicer.org/t/why-arent-we-building-the-extensions-in-parallel/47155)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 10\
**Last updated:** [May 28, 2026, 12:14am UTC](https://discourse.slicer.org/t/why-arent-we-building-the-extensions-in-parallel/47155 "2026-05-28T00:14:14Z")

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When I look at the dashboard for extension and sort them by time, there is a clear pattern. Extensions are build sequentially by the operating system. Is there are reason we are doing that? Can’t they be parallelized? L…

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## [PCA visualization parameters](https://discourse.slicer.org/t/pca-visualization-parameters/47141)

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**Author:** [@Stephan\_Collins](https://discourse.slicer.org/u/Stephan_Collins)\
**Replies:** 5\
**Last updated:** [May 27, 2026, 4:14pm UTC](https://discourse.slicer.org/t/pca-visualization-parameters/47141 "2026-05-27T16:14:55Z")

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Hi everyone, I am working with the GPA module from slicermorph and I noticed some changes which are most likely intentional and for good reasons but I need to ask. When you have a PCA showing segregation thanks to mult…

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## [2026.05.26 Weekly Meeting](https://discourse.slicer.org/t/2026-05-26-weekly-meeting/47103)

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**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 3\
**Last updated:** [May 26, 2026, 5:15pm UTC](https://discourse.slicer.org/t/2026-05-26-weekly-meeting/47103 "2026-05-26T17:15:35Z")

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Title: 2026.05.26 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 11:00 AM ET until 12:00 PM ET. Anyone is welcome to join at this link: Launch Meeting - Zoom Agenda: Please post to this t…

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