# Top

**URL:** https://discourse.slicer.org/top.md?page=6

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

**Page:** 7

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## [Total Segmentator Extension Fails Installation on Slicer 5.12.0](https://discourse.slicer.org/t/total-segmentator-extension-fails-installation-on-slicer-5-12-0/47468)

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**Author:** [@amyers](https://discourse.slicer.org/u/amyers)\
**Replies:** 2\
**Last updated:** [July 7, 2026, 3:08pm UTC](https://discourse.slicer.org/t/total-segmentator-extension-fails-installation-on-slicer-5-12-0/47468 "2026-07-07T15:08:02Z")

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On Windows 11, I just installed Slicer 5.12.0 revision 34621, built 2026-06-24. I was able to install DentalSegmentator, SlicerOpenAnatomy, NNUnet, etc; however, TotalSegmentator failed to install. This is the error I r…

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## [2026.07.28 Weekly Meeting](https://discourse.slicer.org/t/2026-07-28-weekly-meeting/47713)

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**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 4\
**Last updated:** [July 28, 2026, 7:25pm UTC](https://discourse.slicer.org/t/2026-07-28-weekly-meeting/47713 "2026-07-28T19:25:36Z")

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Title: 2026.07.28 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: Google Meet meeting 📅 Weekly Meeting · July 28, 2026 …

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## [How to get the IJK coordinate of a fiducial node in 3d slicer development](https://discourse.slicer.org/t/how-to-get-the-ijk-coordinate-of-a-fiducial-node-in-3d-slicer-development/45362)

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**Author:** [@zhutouzjq](https://discourse.slicer.org/u/zhutouzjq)\
**Replies:** 3\
**Last updated:** [December 4, 2025, 3:17am UTC](https://discourse.slicer.org/t/how-to-get-the-ijk-coordinate-of-a-fiducial-node-in-3d-slicer-development/45362 "2025-12-04T03:17:32Z")

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thank the help provided by jamesobulter and cpinter, now i can successfully choose the fiducial in myself extension. but i fail to get the ijk coordinate of this fudicial node in my extension. i can only get the ras …

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

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**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")

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: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…

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## [Diffusion tensor estimation from a manually segmented brain mask](https://discourse.slicer.org/t/diffusion-tensor-estimation-from-a-manually-segmented-brain-mask/46587)

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**Author:** [@Anna\_98](https://discourse.slicer.org/u/Anna_98)\
**Replies:** 1\
**Last updated:** [March 26, 2026, 7:20pm UTC](https://discourse.slicer.org/t/diffusion-tensor-estimation-from-a-manually-segmented-brain-mask/46587 "2026-03-26T19:20:47Z")

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Hey There, I tried to do get an “output DTI volume” with a manually segmented brain mask, but it didn’t work. My workflow (using Version 5.6.2): Generated a automatic brain mask \> convert lablemap to segmentation node…

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## [How to change the default file format for save](https://discourse.slicer.org/t/how-to-change-the-default-file-format-for-save/46278)

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**Author:** [@Victor\_Wayne](https://discourse.slicer.org/u/Victor_Wayne)\
**Replies:** 2\
**Last updated:** [February 28, 2026, 4:01am UTC](https://discourse.slicer.org/t/how-to-change-the-default-file-format-for-save/46278 "2026-02-28T04:01:31Z")

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Hello, When we click on the save button the default file format for saving a scene is .mrml. Is there any way I can change it to .mrb? Is there a way to edit the config file so that the save data dialog opens with .mrb …

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## [Split multiframe dicom to series dicom code problem](https://discourse.slicer.org/t/split-multiframe-dicom-to-series-dicom-code-problem/45374)

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**Author:** [@Berk\_Gezgin](https://discourse.slicer.org/u/Berk_Gezgin)\
**Replies:** 3\
**Last updated:** [December 5, 2025, 2:38pm UTC](https://discourse.slicer.org/t/split-multiframe-dicom-to-series-dicom-code-problem/45374 "2025-12-05T14:38:36Z")

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Hello I wrote the following code. My goal here is to slice a single DICOM file and establish a standard. However, the sliced DICOM does not appear the same as the original DICOM in the slicer program. The positions and …

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## [SlicerRT blocked by Windows Smart App Control in Slicer 5.12.4](https://discourse.slicer.org/t/slicerrt-blocked-by-windows-smart-app-control-in-slicer-5-12-4/48534)

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**Author:** [@hipresearch\_jp](https://discourse.slicer.org/u/hipresearch_jp)\
**Replies:** 4\
**Last updated:** [October 16, 2026, 8:20pm UTC](https://discourse.slicer.org/t/slicerrt-blocked-by-windows-smart-app-control-in-slicer-5-12-4/48534 "2026-10-16T20:20:59Z")

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Hello SlicerRT team, I’m setting up SlicerRT to generate DRRs for orthopedic CT research. On a fresh installation of Slicer 5.12.4 (revision 34645), with SlicerRT installed through the Extensions Manager, Windows Smart …

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## [How can Calculate & Visualize the Center of Mass (COM)?](https://discourse.slicer.org/t/how-can-calculate-visualize-the-center-of-mass-com/47074)

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**Author:** [@zahra\_Tabasi](https://discourse.slicer.org/u/zahra_Tabasi)\
**Replies:** 3\
**Last updated:** [June 15, 2026, 10:30pm UTC](https://discourse.slicer.org/t/how-can-calculate-visualize-the-center-of-mass-com/47074 "2026-06-15T22:30:38Z")

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Hello everyone, I am currently conducting a research study involving patients with unilateral left-sided breast cancer undergoing radiotherapy. The purpose of my study is to compare Normal Breathing (free breathing) and…

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## [Segmentation and Volume Misaligned After Using Biomedisa](https://discourse.slicer.org/t/segmentation-and-volume-misaligned-after-using-biomedisa/46331)

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**Author:** [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\
**Replies:** 3\
**Last updated:** [March 6, 2026, 10:34am UTC](https://discourse.slicer.org/t/segmentation-and-volume-misaligned-after-using-biomedisa/46331 "2026-03-06T10:34:38Z")

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The problem is the following: I segment nasal turbinates in rodents and use Biomedisa. When I take my CT scans, I need to orient them in 3D Slicer, so I create a Transform and adjust the orientation. After that, I genera…

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## [How can I change HU values into normal range?](https://discourse.slicer.org/t/how-can-i-change-hu-values-into-normal-range/45379)

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**Author:** [@ChrisMak](https://discourse.slicer.org/u/ChrisMak)\
**Replies:** 3\
**Last updated:** [December 5, 2025, 8:00pm UTC](https://discourse.slicer.org/t/how-can-i-change-hu-values-into-normal-range/45379 "2025-12-05T20:00:43Z")

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So, I have a bunch of dental cbct’s that are way too dark to be useful. The source data came from transforming Viewer vol files into nhdr/nrrd, and I’m guessing all calibration (window/level) is gone (or I can’t find it…

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## [Projecting surface landmarks on sample model to target model in ALPACA](https://discourse.slicer.org/t/projecting-surface-landmarks-on-sample-model-to-target-model-in-alpaca/48170)

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**Author:** [@JYTan](https://discourse.slicer.org/u/JYTan)\
**Replies:** 4\
**Last updated:** [September 15, 2026, 4:37pm UTC](https://discourse.slicer.org/t/projecting-surface-landmarks-on-sample-model-to-target-model-in-alpaca/48170 "2026-09-15T16:37:49Z")

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Hi, I am new user of 3D slicer. I have generated a template mesh and surface landmarks of orbital volume segmentation and wish to project same numbers of surface landmarks from the template model to a set of target model…

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## [Cannot load tif files](https://discourse.slicer.org/t/cannot-load-tif-files/45216)

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**Author:** [@Busra\_Pullu1](https://discourse.slicer.org/u/Busra_Pullu1)\
**Replies:** 4\
**Last updated:** [November 26, 2025, 6:38pm UTC](https://discourse.slicer.org/t/cannot-load-tif-files/45216 "2025-11-26T18:38:50Z")

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I need to upload more than 2500 tiff files. I spent lots of time uploading them, but Slicer keeps crashing. What is the best way to do this? Btw, for some reason I have no image stacks on the modules. I added, like, add …

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## [Using the pyigtl Library to send data across a docker compose network](https://discourse.slicer.org/t/using-the-pyigtl-library-to-send-data-across-a-docker-compose-network/45859)

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**Author:** [@Oskey999](https://discourse.slicer.org/u/Oskey999)\
**Replies:** 5\
**Last updated:** [February 5, 2026, 12:02pm UTC](https://discourse.slicer.org/t/using-the-pyigtl-library-to-send-data-across-a-docker-compose-network/45859 "2026-02-05T12:02:59Z")

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Hello, I am trying to run SlicerTMS as two containers in a docker-compose but I am having issues using the pyigtl python library to send the data between the two containers. I have got a container to send the data from…

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## [How Can I Exclude Teeth When Creating Semi-Landmarks on the Mandible?](https://discourse.slicer.org/t/how-can-i-exclude-teeth-when-creating-semi-landmarks-on-the-mandible/45222)

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**Author:** [@Esra\_Karacan](https://discourse.slicer.org/u/Esra_Karacan)\
**Replies:** 1\
**Last updated:** [November 25, 2025, 6:00pm UTC](https://discourse.slicer.org/t/how-can-i-exclude-teeth-when-creating-semi-landmarks-on-the-mandible/45222 "2025-11-25T18:00:26Z")

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Dear all, I am working on human mandibles. Most of my material has missing teeth. So, I would like to discard the teeth and put the semi-landmarks on just bone. I tried to delete the teeth, but the software put on the s…

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## [Shift and wrap-around voxels transform](https://discourse.slicer.org/t/shift-and-wrap-around-voxels-transform/47022)

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**Author:** [@brizolara.lt](https://discourse.slicer.org/u/brizolara.lt)\
**Replies:** 4\
**Last updated:** [May 18, 2026, 9:55pm UTC](https://discourse.slicer.org/t/shift-and-wrap-around-voxels-transform/47022 "2026-05-18T21:55:33Z")

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Hi all, I would like to apply a shift in a definite direction (in my case, X) to the voxel values (not the coordinates) of a volume - keeping, thus, origin, spacing and dimensions intact. Also, I would like to wrap aro…

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## [How to react to a segmentation node being changed using cut, erase, paint?](https://discourse.slicer.org/t/how-to-react-to-a-segmentation-node-being-changed-using-cut-erase-paint/45201)

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**Author:** [@Victor\_Wayne](https://discourse.slicer.org/u/Victor_Wayne)\
**Replies:** 4\
**Last updated:** [November 24, 2025, 5:55am UTC](https://discourse.slicer.org/t/how-to-react-to-a-segmentation-node-being-changed-using-cut-erase-paint/45201 "2025-11-24T05:55:24Z")

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Hello, How can I react to a segmentation node being changed using the cut, erase and paint capabilities of the segmentation extension? At first I tried to attach slicer.vtkMRMLSegmentationNode.SegmentationChangedEvent t…

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## [AI driven upper airway analysis](https://discourse.slicer.org/t/ai-driven-upper-airway-analysis/48443)

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**Author:** [@Algiz](https://discourse.slicer.org/u/Algiz)\
**Replies:** 3\
**Last updated:** [October 15, 2026, 3:55pm UTC](https://discourse.slicer.org/t/ai-driven-upper-airway-analysis/48443 "2026-10-15T15:55:12Z")

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Hello! I am trying to analyze my own cbct scan using 3d slicer and it is a very interesting program. some extensions have already helped me segment the airway and do a rudimentary airway analysis to determine the narr…

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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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## [2026.03.17 Weekly Meeting](https://discourse.slicer.org/t/2026-03-17-weekly-meeting/46468)

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**Author:** [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Replies:** 4\
**Last updated:** [March 17, 2026, 3:40pm UTC](https://discourse.slicer.org/t/2026-03-17-weekly-meeting/46468 "2026-03-17T15:40:15Z")

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Tomorrow, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: https://bit.ly/slicer-googlemeet-hosted-by-kitware Agenda: Please post to this thread to …

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## [Spect Ct Reconstruction ](https://discourse.slicer.org/t/spect-ct-reconstruction/48001)

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**Author:** [@JuanIgnacioElutchanz](https://discourse.slicer.org/u/JuanIgnacioElutchanz)\
**Replies:** 3\
**Last updated:** [August 30, 2026, 3:47pm UTC](https://discourse.slicer.org/t/spect-ct-reconstruction/48001 "2026-08-30T15:47:13Z")

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Hello everyone, I need some help in terms of spect reconstruction in 3dSlicer. I’m student of Nuclear Medicine in Uruguay, I’m currently working on a research project to present at the Uruguayan Con…

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## [\[OpenDose3D\] Testing users needed](https://discourse.slicer.org/t/opendose3d-testing-users-needed/48484)

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**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Replies:** 0\
**Last updated:** [October 12, 2026, 3:57pm UTC](https://discourse.slicer.org/t/opendose3d-testing-users-needed/48484 "2026-10-12T15:57:30Z")

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Hello Testing users needed to test the gate 10 functionality inside OpenDose3D. Clone the repository OpenDose / SlicerOpenDose3D · GitLab git checkout feat/gate10-integration in a fresh Slicer installation, add the mo…

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## [New mailing list for PW announcements!](https://discourse.slicer.org/t/new-mailing-list-for-pw-announcements/46895)

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**Author:** [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Replies:** 1\
**Last updated:** [May 6, 2026, 8:34pm UTC](https://discourse.slicer.org/t/new-mailing-list-for-pw-announcements/46895 "2026-05-06T20:34:24Z")

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Hi all, We are setting up a new mailing list for PW announcements. It is a Gaggle hosted service, and will provide a lot more flexibility for management compared to the old PW mailing list. If you have attended Projec…

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## [Freehand ultrasound in 3D Slicer: image inverted during recording](https://discourse.slicer.org/t/freehand-ultrasound-in-3d-slicer-image-inverted-during-recording/46592)

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**Author:** [@daandevlieger2-alt](https://discourse.slicer.org/u/daandevlieger2-alt)\
**Replies:** 3\
**Last updated:** [April 2, 2026, 1:43pm UTC](https://discourse.slicer.org/t/freehand-ultrasound-in-3d-slicer-image-inverted-during-recording/46592 "2026-04-02T13:43:09Z")

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Hi everyone, I’m using 3D Slicer (version 5.8.1) together with an OptiTrack V120 Trio and the PLUS/ArtUS setup for 3D freehand ultrasound. I’m encountering an issue where, during acquisition, the ultrasound image is st…

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## [Quality loss in segments ](https://discourse.slicer.org/t/quality-loss-in-segments/46417)

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**Author:** [@Skulleditor](https://discourse.slicer.org/u/Skulleditor)\
**Replies:** 3\
**Last updated:** [March 10, 2026, 2:36am UTC](https://discourse.slicer.org/t/quality-loss-in-segments/46417 "2026-03-10T02:36:43Z")

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Hello everyone, I am working with a micro-CT dataset of a snake skull in 3D Slicer (v5.8) and I am experiencing some difficulty with the segmentation workflow. When I visualize the dataset using Volume Rendering, the s…

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## [A web-based volume path tracer](https://discourse.slicer.org/t/a-web-based-volume-path-tracer/47447)

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**Author:** [@MikhailGorobets](https://discourse.slicer.org/u/MikhailGorobets)\
**Replies:** 2\
**Last updated:** [June 24, 2026, 9:27pm UTC](https://discourse.slicer.org/t/a-web-based-volume-path-tracer/47447 "2026-06-24T21:27:00Z")

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Hi everyone – I’ve been experimenting with browser-based medical volume rendering. It’s a volume path tracer that runs entirely in the browser. Under the hood it’s all C++ compiled to WebAssembly – Diligent Core’s WebGP…

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## [There is an error when create a segment from numpy array](https://discourse.slicer.org/t/there-is-an-error-when-create-a-segment-from-numpy-array/45371)

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**Author:** [@zhutouzjq](https://discourse.slicer.org/u/zhutouzjq)\
**Replies:** 3\
**Last updated:** [December 9, 2025, 2:32am UTC](https://discourse.slicer.org/t/there-is-an-error-when-create-a-segment-from-numpy-array/45371 "2025-12-09T02:32:02Z")

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hellow, everyone. i want to creat a segment from a numpy array. and i found the python code in script repository as following. volumeNode = getNode('MRHead') segmentationNode = getNode('Segmentation') segmentId = segme…

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## [Can anyone help with making an STL file of my ear canals for Custom ear plugs?](https://discourse.slicer.org/t/can-anyone-help-with-making-an-stl-file-of-my-ear-canals-for-custom-ear-plugs/46263)

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**Author:** [@JamesBellX](https://discourse.slicer.org/u/JamesBellX)\
**Replies:** 4\
**Last updated:** [February 24, 2026, 12:14pm UTC](https://discourse.slicer.org/t/can-anyone-help-with-making-an-stl-file-of-my-ear-canals-for-custom-ear-plugs/46263 "2026-02-24T12:14:05Z")

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Hi I need to get custom ear plugs for a medical appointment on the 10th March for a life threatening health condition. I need the plugs for the flights to America from London. I recently had a cbct and I am trying to …

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## [An Extension for colon tumor detection/localization on CT scan in 3D Slicer?](https://discourse.slicer.org/t/an-extension-for-colon-tumor-detection-localization-on-ct-scan-in-3d-slicer/48151)

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**Author:** [@qn\_Huynh](https://discourse.slicer.org/u/qn_Huynh)\
**Replies:** 3\
**Last updated:** [September 14, 2026, 5:23am UTC](https://discourse.slicer.org/t/an-extension-for-colon-tumor-detection-localization-on-ct-scan-in-3d-slicer/48151 "2026-09-14T05:23:06Z")

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An Extension for colon tumor detection/localization on CT scan in 3D Slicer I am very interested in the project developed by Xu and colleagues, entitled “An Open-Source Implementation of Colon CAD in 3D Slicer.” The art…

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## [3D Slicer doesn’t start after Windows Install](https://discourse.slicer.org/t/3d-slicer-doesn-t-start-after-windows-install/47482)

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**Author:** [@Randy\_Peterson](https://discourse.slicer.org/u/Randy_Peterson)\
**Replies:** 2\
**Last updated:** [October 30, 2026, 1:29am UTC](https://discourse.slicer.org/t/3d-slicer-doesn-t-start-after-windows-install/47482 "2026-10-30T01:29:05Z")

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3D Slicer doesn’t start after Windows Install. No Error message- just nothing happens. I am using a Lenovo L5 PC, which has the power to run this. I tried: Creating a C:\\slicer folder and installing there. Same issue. …

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## [How to use 3D Slicer for Cranial Asymmetry Assessment in Infants?](https://discourse.slicer.org/t/how-to-use-3d-slicer-for-cranial-asymmetry-assessment-in-infants/47370)

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**Author:** [@Lucas\_Villalta](https://discourse.slicer.org/u/Lucas_Villalta)\
**Replies:** 3\
**Last updated:** [June 18, 2026, 4:14pm UTC](https://discourse.slicer.org/t/how-to-use-3d-slicer-for-cranial-asymmetry-assessment-in-infants/47370 "2026-06-18T16:14:56Z")

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Hi, I’m a Pediatric Physical Therapist and I work with infants with Cranial Asymmetries. However, all softwares for asymmetry analysis are paid and I would like to know if I can use this software to calculate these asymm…

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## [qMRMLSubjectHierarchyComboBox: Setting noneDisplay from Python segfaults](https://discourse.slicer.org/t/qmrmlsubjecthierarchycombobox-setting-nonedisplay-from-python-segfaults/45052)

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**Author:** [@shai-ikko](https://discourse.slicer.org/u/shai-ikko)\
**Replies:** 4\
**Last updated:** [November 14, 2025, 9:27am UTC](https://discourse.slicer.org/t/qmrmlsubjecthierarchycombobox-setting-nonedisplay-from-python-segfaults/45052 "2025-11-14T09:27:22Z")

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Hi, I’m trying to write a SegmentEditorEffect to apply a mask to all volumes in a study (related to Applying manipulations to all volumes in a study ). I want the result to go into a study, so where MaskVolume has a vol…

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## [Downloading older releases is problematic](https://discourse.slicer.org/t/downloading-older-releases-is-problematic/45645)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 1\
**Last updated:** [December 30, 2025, 8:30pm UTC](https://discourse.slicer.org/t/downloading-older-releases-is-problematic/45645 "2025-12-30T20:30:08Z")

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Accessing older releases does not offer download of previous stable releases. I had to take a good look at access older releases page to come up with this link to what I wanted: https://download.slicer.org/download?os=wi…

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## [Help with an Error: Loading message](https://discourse.slicer.org/t/help-with-an-error-loading-message/46503)

<div class="topic-metadata">

**Author:** [@BrittneyL](https://discourse.slicer.org/u/BrittneyL)\
**Replies:** 2\
**Last updated:** [March 23, 2026, 10:01am UTC](https://discourse.slicer.org/t/help-with-an-error-loading-message/46503 "2026-03-23T10:01:40Z")

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Good Afternoon! I have been having the same error consistently and on more than one computer: The text of the error reads: Error: Loading C:/Users/blacy2/Desktop/A27.mrb - ERROR: In vtkMRMLStorableNode.cxx, line 316 vt…

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## [Segment Statistics for dynamic (multi frame) PET](https://discourse.slicer.org/t/segment-statistics-for-dynamic-multi-frame-pet/45253)

<div class="topic-metadata">

**Author:** [@lennart81](https://discourse.slicer.org/u/lennart81)\
**Replies:** 2\
**Last updated:** [December 1, 2025, 7:03pm UTC](https://discourse.slicer.org/t/segment-statistics-for-dynamic-multi-frame-pet/45253 "2025-12-01T19:03:56Z")

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Hi community, I am working with dynamic PET data acquired on a Siemens Quadra PET/CT (30 frames + static CT). I have loaded the data and segmented several VOIs based on the CT. My goal is to extract the mean PET intens…

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## [2026.10.27 Weekly Meeting](https://discourse.slicer.org/t/2026-10-27-weekly-meeting/48559)

<div class="topic-metadata">

**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 5\
**Last updated:** [October 27, 2026, 2:41pm UTC](https://discourse.slicer.org/t/2026-10-27-weekly-meeting/48559 "2026-10-27T14:41:31Z")

</div>

Title: 2026.10.27 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 10:30 AM ET. (Note the different end time!) Anyone is welcome to join at this link: Google Meet meeting 📅…

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## [Extensions-Manager: Extensions can not be installed](https://discourse.slicer.org/t/extensions-manager-extensions-can-not-be-installed/46824)

<div class="topic-metadata">

**Author:** [@juliangallaun](https://discourse.slicer.org/u/juliangallaun)\
**Replies:** 2\
**Last updated:** [April 24, 2026, 1:29pm UTC](https://discourse.slicer.org/t/extensions-manager-extensions-can-not-be-installed/46824 "2026-04-24T13:29:09Z")

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Hello, I am unable to install new Extensions. Following message show up. Extensions can not be installed. Failed to load extension page using this URL: @KitwareMedical/slicer-extensions-webapp Check that 3D Slicer is…

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## [PW44 Meeting Nov 25 2025](https://discourse.slicer.org/t/pw44-meeting-nov-25-2025/45210)

<div class="topic-metadata">

**Author:** [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Replies:** 0\
**Last updated:** [November 24, 2025, 3:30pm UTC](https://discourse.slicer.org/t/pw44-meeting-nov-25-2025/45210 "2025-11-24T15:30:35Z")

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Dear Project Week community, The next project week preparation meeting will be tomorrow, Tuesday, Nov 25, at 10:00 AM ET. (2025-11-25T15:00:00Z (UTC)) You can join using the following link which will remain the same fo…

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## [After midline mirroring of the ROI, how to edit the resulting mirrored region?](https://discourse.slicer.org/t/after-midline-mirroring-of-the-roi-how-to-edit-the-resulting-mirrored-region/48525)

<div class="topic-metadata">

**Author:** [@Gargantua](https://discourse.slicer.org/u/Gargantua)\
**Replies:** 4\
**Last updated:** [October 16, 2026, 3:32pm UTC](https://discourse.slicer.org/t/after-midline-mirroring-of-the-roi-how-to-edit-the-resulting-mirrored-region/48525 "2026-10-16T15:32:00Z")

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For the obtained mirrored region, can areas with HU values less than 20 be ignored using the threshold function, or erased with the eraser tool?

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## [2026.11.03 Weekly Meeting](https://discourse.slicer.org/t/2026-11-03-weekly-meeting/48633)

<div class="topic-metadata">

**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 6\
**Last updated:** [November 3, 2026, 3:18pm UTC](https://discourse.slicer.org/t/2026-11-03-weekly-meeting/48633 "2026-11-03T15:18:10Z")

</div>

Title: 2026.11.03 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET Anyone is welcome to join at this link: Google Meet meeting 📅 Weekly Meeting · November 3, 2026 10:00 AM (Americ…

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## [2026.09.08 Weekly Meeting](https://discourse.slicer.org/t/2026-09-08-weekly-meeting/48093)

<div class="topic-metadata">

**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 3\
**Last updated:** [September 8, 2026, 5:16pm UTC](https://discourse.slicer.org/t/2026-09-08-weekly-meeting/48093 "2026-09-08T17:16:18Z")

</div>

Title: 2026.09.08 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: Google Meet meeting 📅 Weekly Meeting · September 8, 2…

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

<div class="topic-metadata">

**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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## [Margin effect altering multiple segments at once](https://discourse.slicer.org/t/margin-effect-altering-multiple-segments-at-once/45554)

<div class="topic-metadata">

**Author:** [@parmidajafarian](https://discourse.slicer.org/u/parmidajafarian)\
**Replies:** 3\
**Last updated:** [December 20, 2025, 5:58am UTC](https://discourse.slicer.org/t/margin-effect-altering-multiple-segments-at-once/45554 "2025-12-20T05:58:17Z")

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Hi everyone, I’m running into a problem while trying to use the margin effect in the segment editor. My goal is to create a shrunken copy of a Brain segment for CSF segmentation without altering the original Brain segme…

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## [2025.11.11 Weekly Meeting](https://discourse.slicer.org/t/2025-11-11-weekly-meeting/45026)

<div class="topic-metadata">

**Author:** [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Replies:** 3\
**Last updated:** [November 17, 2025, 3:35pm UTC](https://discourse.slicer.org/t/2025-11-11-weekly-meeting/45026 "2025-11-17T15:35:15Z")

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Tomorrow, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. a Anyone is welcome to join at this link: https://bit.ly/slicer-googlemeet-hosted-by-kitware Agenda: Please post to this thread t…

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## [Issue with surface area measurement in L3 skeletal muscle segmentation](https://discourse.slicer.org/t/issue-with-surface-area-measurement-in-l3-skeletal-muscle-segmentation/45916)

<div class="topic-metadata">

**Author:** [@NutritionDepartment](https://discourse.slicer.org/u/NutritionDepartment)\
**Replies:** 2\
**Last updated:** [January 26, 2026, 6:31pm UTC](https://discourse.slicer.org/t/issue-with-surface-area-measurement-in-l3-skeletal-muscle-segmentation/45916 "2026-01-26T18:31:07Z")

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Dear 3D Slicer Development Team, I am using 3D Slicer to segment skeletal muscle on a single axial CT slice at the L3 level for body composition research. After segmentation, the Segment Statistics module reports a rea…

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## [CTA vessel segmentation: petrous ICA vs bone overlap problem](https://discourse.slicer.org/t/cta-vessel-segmentation-petrous-ica-vs-bone-overlap-problem/46803)

<div class="topic-metadata">

**Author:** [@sandcastle](https://discourse.slicer.org/u/sandcastle)\
**Replies:** 2\
**Last updated:** [April 22, 2026, 7:26pm UTC](https://discourse.slicer.org/t/cta-vessel-segmentation-petrous-ica-vs-bone-overlap-problem/46803 "2026-04-22T19:26:03Z")

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Hi all, I’ve been working on segmenting the circle of Willis and proximal carotids from CTA data. This has been straightforward with 3DRA and TOF-MRA, but I’m running into difficulty with the petrous ICA being inseparab…

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## [Segmentation bounds cropped even when "cropped to minimum extent" is unchecked](https://discourse.slicer.org/t/segmentation-bounds-cropped-even-when-cropped-to-minimum-extent-is-unchecked/46920)

<div class="topic-metadata">

**Author:** [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Replies:** 3\
**Last updated:** [May 6, 2026, 5:36am UTC](https://discourse.slicer.org/t/segmentation-bounds-cropped-even-when-cropped-to-minimum-extent-is-unchecked/46920 "2026-05-06T05:36:36Z")

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Sequence of events: Create segmentation using slicer modify segmentation in external python script using pynrrd re-import segmentation into slicer modify segmentation in slicer save segmentation This saved segmentation…

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## [2026.04.28 Weekly Meeting](https://discourse.slicer.org/t/2026-04-28-weekly-meeting/46826)

<div class="topic-metadata">

**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 3\
**Last updated:** [April 28, 2026, 2:14pm UTC](https://discourse.slicer.org/t/2026-04-28-weekly-meeting/46826 "2026-04-28T14:14:25Z")

</div>

Title: 2026.04.28 Weekly Meeting Next Tuesday, we will be having our next weekly hangout at 10:00 AM ET until 11:00 AM ET. Anyone is welcome to join at this link: https://bit.ly/slicer-googlemeet-hosted-by-kitware A…

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## [Image distortion in two of the planes](https://discourse.slicer.org/t/image-distortion-in-two-of-the-planes/46505)

<div class="topic-metadata">

**Author:** [@rainbow.jedi](https://discourse.slicer.org/u/rainbow.jedi)\
**Replies:** 3\
**Last updated:** [March 23, 2026, 12:08pm UTC](https://discourse.slicer.org/t/image-distortion-in-two-of-the-planes/46505 "2026-03-23T12:08:34Z")

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I’m very new to 3d slicer and had a lot of images to go through but on all of them 2/3 of the planes are distorted to some extent. The one I’ll try and attach here is a foot CT for context. I’m aware this problem has pro…

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