# Support

**URL:** https://discourse.slicer.org/c/support/11.md?page=2

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

**Page:** 3

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## [Setting segment opacity to \< 1.0 hides segments](https://discourse.slicer.org/t/setting-segment-opacity-to-1-0-hides-segments/46800)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 12\
**Last updated:** [August 12, 2026, 1:24pm UTC](https://discourse.slicer.org/t/setting-segment-opacity-to-1-0-hides-segments/46800 "2026-08-12T13:24:28Z")

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If the opacity of a segment is reduced from the default 1.0, either for the whole segmentation or for the selected segment, the 3D representation does not persist. It appears again if set to 1.0. This is seen in Linux b…

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## [LungCTAnalyzer extension for lung CT segmentation and analysis for COVID-19 assessment](https://discourse.slicer.org/t/lungctanalyzer-extension-for-lung-ct-segmentation-and-analysis-for-covid-19-assessment/15006)

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**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 52\
**Last updated:** [August 12, 2026, 7:29am UTC](https://discourse.slicer.org/t/lungctanalyzer-extension-for-lung-ct-segmentation-and-analysis-for-covid-19-assessment/15006 "2026-08-12T07:29:32Z")

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New extension is added for lung CT segmentation and analysis for COVID-19 assessment. It is developed by Prof. Rudolf Bumm (@rbumm), a clinician in KSGR (Chur, Switzerland; with some help from Slicer core developers to p…

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## [3D Slicer cannot be installed in Windows 11](https://discourse.slicer.org/t/3d-slicer-cannot-be-installed-in-windows-11/47861)

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**Author:** [@Abdoelabassi](https://discourse.slicer.org/u/Abdoelabassi)\
**Replies:** 1\
**Last updated:** [August 12, 2026, 3:17am UTC](https://discourse.slicer.org/t/3d-slicer-cannot-be-installed-in-windows-11/47861 "2026-08-12T03:17:56Z")

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I downloaded the installer, but the integrity check of Win11 has failed. Common causes include an incomplete download (which is unlikely, because the download was healthy and complete) and damaged media.

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## [AI-Powered Automatic Segmentation Assistant for 3D Slicer](https://discourse.slicer.org/t/ai-powered-automatic-segmentation-assistant-for-3d-slicer/47860)

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**Author:** [@AIOmarRehan](https://discourse.slicer.org/u/AIOmarRehan)\
**Replies:** 1\
**Last updated:** [August 11, 2026, 3:08pm UTC](https://discourse.slicer.org/t/ai-powered-automatic-segmentation-assistant-for-3d-slicer/47860 "2026-08-11T15:08:02Z")

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Hi everyone, I’m interested in contributing to 3D Slicer by developing an AI-Powered Automatic Segmentation Assistant. The idea is to provide a user-friendly workflow for applying modern AI segmentation models to medic…

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## [Tomografo EAGLE EDGE ](https://discourse.slicer.org/t/tomografo-eagle-edge/47862)

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**Author:** [@AMILCAR](https://discourse.slicer.org/u/AMILCAR)\
**Replies:** 1\
**Last updated:** [August 11, 2026, 3:05pm UTC](https://discourse.slicer.org/t/tomografo-eagle-edge/47862 "2026-08-11T15:05:04Z")

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Good morning. The radiology center has a Brazilian EAGLE EDGE CT scanner, and the slicer cannot read these DCM files. How can I solve this problem? Thank you very much for your help.

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## [How can I manually assign colors to structures in my 3D Model?](https://discourse.slicer.org/t/how-can-i-manually-assign-colors-to-structures-in-my-3d-model/47827)

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**Author:** [@Nonso](https://discourse.slicer.org/u/Nonso)\
**Replies:** 3\
**Last updated:** [August 11, 2026, 2:02pm UTC](https://discourse.slicer.org/t/how-can-i-manually-assign-colors-to-structures-in-my-3d-model/47827 "2026-08-11T14:02:38Z")

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Operating system: Windows 11 Pro Slicer version: 5.10.0 Expected behavior: Actual behavior: I imported a segmented model in .nrrd format, from MIB. After creating a model in 3D Slicer, using the model maker, most of t…

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## [Segmentation clipping as a node](https://discourse.slicer.org/t/segmentation-clipping-as-a-node/47852)

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**Author:** [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\
**Replies:** 0\
**Last updated:** [August 10, 2026, 7:24pm UTC](https://discourse.slicer.org/t/segmentation-clipping-as-a-node/47852 "2026-08-10T19:24:13Z")

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im a big fan of clipping , however it is too far hidden and so many step to toggle back and forth. i think making it a module vs a node would be great addition . if two clipping can work as boundaries rather than just c…

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## [Slicer crashes after multiple slicer.mmrlScene.Clear(0)](https://discourse.slicer.org/t/slicer-crashes-after-multiple-slicer-mmrlscene-clear-0/47801)

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**Author:** [@Deep\_Learning](https://discourse.slicer.org/u/Deep_Learning)\
**Replies:** 2\
**Last updated:** [August 10, 2026, 2:25pm UTC](https://discourse.slicer.org/t/slicer-crashes-after-multiple-slicer-mmrlscene-clear-0/47801 "2026-08-10T14:25:51Z")

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When processing numerous studies with a Clear(0) after each, I eventually get a fatal exception crash. Work flow is define convenience functions in the python console, (load mrb, process, save, Clear, repeat). Of cours…

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## [SlicerNNInteractive: segmenting one structure erases part of an adjacent, already-completed segment](https://discourse.slicer.org/t/slicernninteractive-segmenting-one-structure-erases-part-of-an-adjacent-already-completed-segment/47792)

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**Author:** [@Jean\_Pinson](https://discourse.slicer.org/u/Jean_Pinson)\
**Replies:** 3\
**Last updated:** [August 9, 2026, 3:28am UTC](https://discourse.slicer.org/t/slicernninteractive-segmenting-one-structure-erases-part-of-an-adjacent-already-completed-segment/47792 "2026-08-09T03:28:55Z")

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Hi everyone, The new version of nninteractive in 3D slicer is huge !!! I’m using it on local on my desktop PC but I’ve now an issue that I hadn’t before where several structures are directly adjacent (e.g., bladder and …

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## [Level tracing tool is either an amnesiac or thinks I'm too stupid to segment on my own](https://discourse.slicer.org/t/level-tracing-tool-is-either-an-amnesiac-or-thinks-im-too-stupid-to-segment-on-my-own/47814)

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**Author:** [@Chelonian](https://discourse.slicer.org/u/Chelonian)\
**Replies:** 2\
**Last updated:** [August 8, 2026, 8:13am UTC](https://discourse.slicer.org/t/level-tracing-tool-is-either-an-amnesiac-or-thinks-im-too-stupid-to-segment-on-my-own/47814 "2026-08-08T08:13:36Z")

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Operating system: Windows 11 Pro Slicer version: 5.12.0 Expected behavior: Each level I trace using the “level tracing” tool is saved and placed into the 3d model of that segment Actual behavior: random sections (cons…

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## [SlicerDRRGenerator (lancelevine) — how to get lateral/oblique views? Rotation parameters undocumented](https://discourse.slicer.org/t/slicerdrrgenerator-lancelevine-how-to-get-lateral-oblique-views-rotation-parameters-undocumented/47824)

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**Author:** [@anuragp2018](https://discourse.slicer.org/u/anuragp2018)\
**Replies:** 0\
**Last updated:** [August 7, 2026, 10:06am UTC](https://discourse.slicer.org/t/slicerdrrgenerator-lancelevine-how-to-get-lateral-oblique-views-rotation-parameters-undocumented/47824 "2026-08-07T10:06:46Z")

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Hi all, I’m using the SlicerDRRGenerator extension ( GitHub - lancelevine/SlicerDRRGenerator: A 3D Slicer extension that generates Digitally Reconstructed Radiographs · GitHub ) to generate DRRs from a pelvis CT for com…

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## [Laptop requirements to do segmentation and volume rendering of wing imaginal discs](https://discourse.slicer.org/t/laptop-requirements-to-do-segmentation-and-volume-rendering-of-wing-imaginal-discs/47812)

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**Author:** [@FlylabCHG](https://discourse.slicer.org/u/FlylabCHG)\
**Replies:** 4\
**Last updated:** [August 6, 2026, 3:34pm UTC](https://discourse.slicer.org/t/laptop-requirements-to-do-segmentation-and-volume-rendering-of-wing-imaginal-discs/47812 "2026-08-06T15:34:24Z")

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I would like to know if anyone is using 3-D Slicer to segment wing imaginal discs of Drosophila larvae. I take images of discs that are too small to be isolated out of the larvae. They are labelled with gfp expression an…

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## [Unable to load DICOM into sequence browser](https://discourse.slicer.org/t/unable-to-load-dicom-into-sequence-browser/47813)

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**Author:** [@Rene\_Mazuela](https://discourse.slicer.org/u/Rene_Mazuela)\
**Replies:** 2\
**Last updated:** [August 5, 2026, 9:05pm UTC](https://discourse.slicer.org/t/unable-to-load-dicom-into-sequence-browser/47813 "2026-08-05T21:05:07Z")

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We’re having an inconsistent issue in 3D Slicer with loading DICOM data as a sequence. Some team members can load a DICOM series into the Sequence Browser and select the proper frame, but others do not see the option to …

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## [Download side giving internal error](https://discourse.slicer.org/t/download-side-giving-internal-error/47811)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 2\
**Last updated:** [August 5, 2026, 8:14pm UTC](https://discourse.slicer.org/t/download-side-giving-internal-error/47811 "2026-08-05T20:14:24Z")

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I am trying to download the stable for windows. After I click it tries to connect for a few minutes and eventually gives “Internal Server Error” @Sam\_Horvath @ebrahim

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## [extensions manager website is not opening](https://discourse.slicer.org/t/extensions-manager-website-is-not-opening/47800)

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**Author:** [@enjy\_sallam](https://discourse.slicer.org/u/enjy_sallam)\
**Replies:** 1\
**Last updated:** [August 4, 2026, 3:26pm UTC](https://discourse.slicer.org/t/extensions-manager-website-is-not-opening/47800 "2026-08-04T15:26:14Z")

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extensions manager website is not opening

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## [A newcomer to 3D Slicer shares a cinematic interior fly-through of his own LAD and asks whether the rippled texture on the lumen wall is real anatomy or a segmentation/reconstruction artifact.](https://discourse.slicer.org/t/a-newcomer-to-3d-slicer-shares-a-cinematic-interior-fly-through-of-his-own-lad-and-asks-whether-the-rippled-texture-on-the-lumen-wall-is-real-anatomy-or-a-segmentation-reconstruction-artifact/47778)

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**Author:** [@Passerby](https://discourse.slicer.org/u/Passerby)\
**Replies:** 3\
**Last updated:** [August 3, 2026, 5:20pm UTC](https://discourse.slicer.org/t/a-newcomer-to-3d-slicer-shares-a-cinematic-interior-fly-through-of-his-own-lad-and-asks-whether-the-rippled-texture-on-the-lumen-wall-is-real-anatomy-or-a-segmentation-reconstruction-artifact/47778 "2026-08-03T17:20:26Z")

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Hi all, This is my first real project in 3D Slicer, and my first time using Guided Artery Segmentation, so I’d value a reality check from people who work with cardiac CTA. I’m a retired electrical engineer and commercia…

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## [Segmenting Occipital Bone on a Head CT](https://discourse.slicer.org/t/segmenting-occipital-bone-on-a-head-ct/47777)

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**Author:** [@Kate\_Sticha](https://discourse.slicer.org/u/Kate_Sticha)\
**Replies:** 1\
**Last updated:** [August 2, 2026, 11:49am UTC](https://discourse.slicer.org/t/segmenting-occipital-bone-on-a-head-ct/47777 "2026-08-02T11:49:51Z")

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Operating system: 3D slicer Slicer version: 5.8.1 Expected behavior: I am trying to segment the occipital bone of a Head CT. I set the initial threshold to 226-3071 in order to capture the skull bone. I think use the c…

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## [PyTorch install fails on Windows with WinError 206 — PythonSlicer.exe is not longPathAware](https://discourse.slicer.org/t/pytorch-install-fails-on-windows-with-winerror-206-pythonslicer-exe-is-not-longpathaware/47781)

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**Author:** [@pboarantes](https://discourse.slicer.org/u/pboarantes)\
**Replies:** 1\
**Last updated:** [July 31, 2026, 7:40pm UTC](https://discourse.slicer.org/t/pytorch-install-fails-on-windows-with-winerror-206-pythonslicer-exe-is-not-longpathaware/47781 "2026-07-31T19:40:47Z")

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Environment 3D Slicer 5.12.3, Windows 11 Default install path: C:\\Users\\\<user\>\\AppData\\Local\\slicer.org\\3D Slicer 5.12.3\\ Extensions: TotalSegmentator, PyTorch, NNUNet torch 2.13.0+cu130 / torchvision 0.28.0+cu130 (sel…

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## [No new mac extensions for stable](https://discourse.slicer.org/t/no-new-mac-extensions-for-stable/47768)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 1\
**Last updated:** [July 31, 2026, 1:53pm UTC](https://discourse.slicer.org/t/no-new-mac-extensions-for-stable/47768 "2026-07-31T13:53:59Z")

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Cdash shows no mac extensions being build for MacOS for today. That doesn’t seem like the usual lateness to me: SlicerStable @ebrahim @Sam\_Horvath

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## [Boundary Cut: Upper airway volume + Lower airway volume does not equal Total airway volume](https://discourse.slicer.org/t/boundary-cut-upper-airway-volume-lower-airway-volume-does-not-equal-total-airway-volume/47779)

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**Author:** [@valperrier1999](https://discourse.slicer.org/u/valperrier1999)\
**Replies:** 0\
**Last updated:** [July 31, 2026, 1:37pm UTC](https://discourse.slicer.org/t/boundary-cut-upper-airway-volume-lower-airway-volume-does-not-equal-total-airway-volume/47779 "2026-07-31T13:37:46Z")

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Hello, I am working on a research project where I need to measure upper, lower and total airway volumes from CBCT scans using 3D Slicer (version 5.10.0). My workflow is the following: Segment the complete upper airwa…

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## [MPR or reslice, saving planes](https://discourse.slicer.org/t/mpr-or-reslice-saving-planes/47765)

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**Author:** [@Deep\_Learning](https://discourse.slicer.org/u/Deep_Learning)\
**Replies:** 1\
**Last updated:** [July 30, 2026, 2:41pm UTC](https://discourse.slicer.org/t/mpr-or-reslice-saving-planes/47765 "2026-07-30T14:41:53Z")

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Is there a mechanism/extension to recall MPR/reslicing (interactive) planes? eg, I have two volumes in a scene, I reslice one, then switch to the other volume and reslice. Want to switch back to volume 1 and have its …

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## [Superimposition of STL files / segmentation](https://discourse.slicer.org/t/superimposition-of-stl-files-segmentation/35695)

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**Author:** [@constance\_sid](https://discourse.slicer.org/u/constance_sid)\
**Replies:** 8\
**Last updated:** [July 30, 2026, 10:54am UTC](https://discourse.slicer.org/t/superimposition-of-stl-files-segmentation/35695 "2026-07-30T10:54:18Z")

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hello ! I’m writing a thesis for my end of studies. It’s about dental mouvements with orthodontics appliance. I have 2 intra oral scans that I need to analyse and compare. those scans are 3D stl files. i figured out t…

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## [Problem using MEMOS extension](https://discourse.slicer.org/t/problem-using-memos-extension/34456)

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**Author:** [@coco](https://discourse.slicer.org/u/coco)\
**Replies:** 25\
**Last updated:** [July 29, 2026, 5:00pm UTC](https://discourse.slicer.org/t/problem-using-memos-extension/34456 "2026-07-29T17:00:51Z")

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Dear Murat, very excited to use this tool for tests but I seem to be stuck. Most likely a problem with my environment but any suggestion or help appreciated. I installed a fresh version of slicer (5.6.1) on windows 11.…

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## [Aligning CBCT & intraoral scan](https://discourse.slicer.org/t/aligning-cbct-intraoral-scan/45801)

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**Author:** [@Aiden](https://discourse.slicer.org/u/Aiden)\
**Replies:** 3\
**Last updated:** [July 29, 2026, 6:53am UTC](https://discourse.slicer.org/t/aligning-cbct-intraoral-scan/45801 "2026-07-29T06:53:11Z")

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I have a STL from an intraoral scan with 3shape, and a CBCT in dicom. How can I align these semi automatically using a few manual landmarks? What I have: 1x Skull CBCT dicom (edit: I also have a segmentation of this fr…

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## [Grow from seeds error - minimum 2 visible segments required](https://discourse.slicer.org/t/grow-from-seeds-error-minimum-2-visible-segments-required/33279)

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**Author:** [@JamesM](https://discourse.slicer.org/u/JamesM)\
**Replies:** 24\
**Last updated:** [July 28, 2026, 10:06pm UTC](https://discourse.slicer.org/t/grow-from-seeds-error-minimum-2-visible-segments-required/33279 "2026-07-28T22:06:48Z")

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Hello! I am measuring tumor volume, segmenting the inside and background separately and using the “grow from seed” function. However, when I try to use “grow from seed” again after filling in the completed volume where t…

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## [How to see VAT and SAT crossection area at L3 level](https://discourse.slicer.org/t/how-to-see-vat-and-sat-crossection-area-at-l3-level/47756)

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**Author:** [@Vishal\_91](https://discourse.slicer.org/u/Vishal_91)\
**Replies:** 0\
**Last updated:** [July 28, 2026, 1:10pm UTC](https://discourse.slicer.org/t/how-to-see-vat-and-sat-crossection-area-at-l3-level/47756 "2026-07-28T13:10:32Z")

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How to calculate VAT and SAT crossection area at L3 level? VAT/SAT ratio also required. Please someone help me, i need it for research purpose. Extensions are not working in my laptop

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## [3D Slicer cannot display cardiac LGE MRI volume correctly – only a single line/slice is shown after DICOM import](https://discourse.slicer.org/t/3d-slicer-cannot-display-cardiac-lge-mri-volume-correctly-only-a-single-line-slice-is-shown-after-dicom-import/47748)

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**Author:** [@yennys](https://discourse.slicer.org/u/yennys)\
**Replies:** 1\
**Last updated:** [July 27, 2026, 5:05pm UTC](https://discourse.slicer.org/t/3d-slicer-cannot-display-cardiac-lge-mri-volume-correctly-only-a-single-line-slice-is-shown-after-dicom-import/47748 "2026-07-27T17:05:12Z")

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Hello everyone, I am using 3D Slicer for cardiac MRI (LGE/PSIR) image analysis. My goal is to perform registration and ROI-based analysis between pre- and post-procedure LGE images. However, I encountered an issue when…

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## [3D Slicer cannot display cardiac LGE MRI volume correctly – only a single line/slice is shown after DICOM import](https://discourse.slicer.org/t/3d-slicer-cannot-display-cardiac-lge-mri-volume-correctly-only-a-single-line-slice-is-shown-after-dicom-import/47746)

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**Author:** [@yennys](https://discourse.slicer.org/u/yennys)\
**Replies:** 0\
**Last updated:** [July 27, 2026, 11:12am UTC](https://discourse.slicer.org/t/3d-slicer-cannot-display-cardiac-lge-mri-volume-correctly-only-a-single-line-slice-is-shown-after-dicom-import/47746 "2026-07-27T11:12:33Z")

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Hello everyone, I am using 3D Slicer for cardiac MRI (LGE/PSIR) image analysis. My goal is to perform registration and ROI-based analysis between pre- and post-procedure LGE images. However, I encountered an issue when…

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## [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)

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**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")

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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…

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## [Concurrent slicer mcp session](https://discourse.slicer.org/t/concurrent-slicer-mcp-session/47612)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 7\
**Last updated:** [July 24, 2026, 7:15pm UTC](https://discourse.slicer.org/t/concurrent-slicer-mcp-session/47612 "2026-07-24T19:15:36Z")

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Sometimes I run two agents simultaneously for different tasks. these tasks are often executed in different Slicer sessions also running concurrently (e.g., stable vs a preview version, or different code branches being te…

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