# Support

**URL:** https://discourse.slicer.org/c/support/11.md?no_subcategories=false

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

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## [About the Support category](https://discourse.slicer.org/t/about-the-support-category/36)

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**Author:** [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Replies:** 0\
**Last updated:** [April 9, 2017, 4:13am UTC](https://discourse.slicer.org/t/about-the-support-category/36 "2017-04-09T04:13:23Z")

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The Support category is for all usage questions and general discussion of Slicer and extensions. Links: Welcome to the 3D Slicer Forum!

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## [Newbie - Need Annotation Help](https://discourse.slicer.org/t/newbie-need-annotation-help/48246)

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**Author:** [@MaxFacRad](https://discourse.slicer.org/u/MaxFacRad)\
**Replies:** 1\
**Last updated:** [October 6, 2026, 2:14pm UTC](https://discourse.slicer.org/t/newbie-need-annotation-help/48246 "2026-10-06T14:14:39Z")

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Hi, total newbie here on this software. i am looking to annotate CT scans, bone fractures specifically, and I need to mark / annotate the CT scans for the data people. I need to make a minimal rectangle/square around th…

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## [Cardiac Agatston Scoring module](https://discourse.slicer.org/t/cardiac-agatston-scoring-module/1544)

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**Author:** [@Emily\_BM](https://discourse.slicer.org/u/Emily_BM)\
**Replies:** 33\
**Last updated:** [October 6, 2026, 11:20am UTC](https://discourse.slicer.org/t/cardiac-agatston-scoring-module/1544 "2026-10-06T11:20:34Z")

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I require help regarding use of 3d slicer module “CardiacAgatstonScoring”.This module isnt showing in any version except 4.4 but in 4.4 when i click Apply(for calculating calcium score)it doesnt work Operating system: …

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## [Apple Silicon 3D Slicer Build](https://discourse.slicer.org/t/apple-silicon-3d-slicer-build/44552)

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**Author:** [@jfbasquiat](https://discourse.slicer.org/u/jfbasquiat)\
**Replies:** 3\
**Last updated:** [October 6, 2026, 4:33am UTC](https://discourse.slicer.org/t/apple-silicon-3d-slicer-build/44552 "2026-10-06T04:33:58Z")

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Hi All - I’m having some difficulty locating the Apple Silicon build of 3D Slicer for macOS Tahoe. Could someone kindly point me in the right direction? (I’ve searched extensively, but all I could find was a build for an…

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## [DentalSegmentator : error loading results : failt to load the segmentation. ](https://discourse.slicer.org/t/dentalsegmentator-error-loading-results-failt-to-load-the-segmentation/48375)

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**Author:** [@samzou974](https://discourse.slicer.org/u/samzou974)\
**Replies:** 7\
**Last updated:** [October 5, 2026, 6:58am UTC](https://discourse.slicer.org/t/dentalsegmentator-error-loading-results-failt-to-load-the-segmentation/48375 "2026-10-05T06:58:39Z")

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Operating system:Windows 11 PRO Slicer version: 5.12.4 Expected behavior: Segmentation of Cone-Beam using DentalSegmentator extension Actual behavior: error 2026/10/01 12:32:47.256 :: nnUNet is already installed (2.8…

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## [Filling skull and orbital holes](https://discourse.slicer.org/t/filling-skull-and-orbital-holes/46831)

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**Author:** [@Bouroumane\_Mohamed\_r](https://discourse.slicer.org/u/Bouroumane_Mohamed_r)\
**Replies:** 10\
**Last updated:** [October 4, 2026, 8:52am UTC](https://discourse.slicer.org/t/filling-skull-and-orbital-holes/46831 "2026-10-04T08:52:01Z")

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Hello dear Slicer Community, It’s a pleasure and honor to post my first message. I’m a beginner using 3D Slicer software. I share with you a case of child craniosynostosis, surgeons asked for a 3D model to plan surger…

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## [Working with sutures \<1 voxel wide on infant skull CT](https://discourse.slicer.org/t/working-with-sutures-1-voxel-wide-on-infant-skull-ct/12389)

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**Author:** [@Otoco](https://discourse.slicer.org/u/Otoco)\
**Replies:** 6\
**Last updated:** [October 4, 2026, 8:38am UTC](https://discourse.slicer.org/t/working-with-sutures-1-voxel-wide-on-infant-skull-ct/12389 "2026-10-04T08:38:10Z")

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Operating system: OS X Catalina (10.15.5) Slicer version: 4.10.2 r28257 Expected behavior: Use thresholding or threshold masking + grow from seeds to create accurate segmentation of skull Actual behavior: Unable to us…

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## [Volume Rendering TDR ERROR CODE 7 issue persists](https://discourse.slicer.org/t/volume-rendering-tdr-error-code-7-issue-persists/48373)

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**Author:** [@ThomasVanParys](https://discourse.slicer.org/u/ThomasVanParys)\
**Replies:** 3\
**Last updated:** [October 2, 2026, 5:29pm UTC](https://discourse.slicer.org/t/volume-rendering-tdr-error-code-7-issue-persists/48373 "2026-10-02T17:29:39Z")

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Hello, I have a large mCT volume which I have halved and converted to an .nrrd volume (1.32 GB) which is succesfully imported into 3DSlicer. However, when I attempt to use the volume rendering window and shift the contr…

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## [Small screen-space "dash" appears at curve midpoint after cloning a Markups curve (Markups → Clone)](https://discourse.slicer.org/t/small-screen-space-dash-appears-at-curve-midpoint-after-cloning-a-markups-curve-markups-clone/48374)

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**Author:** [@evan1](https://discourse.slicer.org/u/evan1)\
**Replies:** 0\
**Last updated:** [October 1, 2026, 2:51pm UTC](https://discourse.slicer.org/t/small-screen-space-dash-appears-at-curve-midpoint-after-cloning-a-markups-curve-markups-clone/48374 "2026-10-01T14:51:40Z")

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Environment: 3D Slicer 5.12.3, Windows 11 Summary After cloning a Markups curve via the Markups module (right-click a curve node in the list → Clone), the cloned curve displays a small horizontal line (“dash”) at (or v…

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## [How to save volume property JSON as a preset](https://discourse.slicer.org/t/how-to-save-volume-property-json-as-a-preset/48139)

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**Author:** [@derradji](https://discourse.slicer.org/u/derradji)\
**Replies:** 5\
**Last updated:** [September 30, 2026, 10:09am UTC](https://discourse.slicer.org/t/how-to-save-volume-property-json-as-a-preset/48139 "2026-09-30T10:09:49Z")

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hi i have volume property saved vp.JSON , and i want to set it as a preset and select it for every volume a want to render . is there a feature that can add or save any modified preset as a new one

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## [download fails/freezes on both direct connection and VPN (with academic license activated)](https://discourse.slicer.org/t/download-fails-freezes-on-both-direct-connection-and-vpn-with-academic-license-activated/47346)

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**Author:** [@Tomy\_Roster](https://discourse.slicer.org/u/Tomy_Roster)\
**Replies:** 3\
**Last updated:** [September 29, 2026, 6:38am UTC](https://discourse.slicer.org/t/download-fails-freezes-on-both-direct-connection-and-vpn-with-academic-license-activated/47346 "2026-09-29T06:38:13Z")

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I am using the TotalSegmentator extension in 3D Slicer to extract muscle and fat compartments using the tissue\_4\_types subtask. I have already successfully obtained and activated my academic license key. However, I am c…

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## [Segmentation color table generator](https://discourse.slicer.org/t/segmentation-color-table-generator/48330)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 0\
**Last updated:** [September 29, 2026, 2:33am UTC](https://discourse.slicer.org/t/segmentation-color-table-generator/48330 "2026-09-29T02:33:47Z")

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This is mostly for people who are using Slicer to segment non-human imaging data. If you want to use ontology mapped terms for your segmentations, I put together a small web-based tool that generates the table. Term Loo…

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## [Rendering of DICOM image failed with more than 4 volumes since version 12](https://discourse.slicer.org/t/rendering-of-dicom-image-failed-with-more-than-4-volumes-since-version-12/48210)

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**Author:** [@mhouse](https://discourse.slicer.org/u/mhouse)\
**Replies:** 18\
**Last updated:** [September 28, 2026, 6:25pm UTC](https://discourse.slicer.org/t/rendering-of-dicom-image-failed-with-more-than-4-volumes-since-version-12/48210 "2026-09-28T18:25:15Z")

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Since version 12 (also with version 13) 3D Slicer crashes, because it cannot render an image with more than 4 volumes. At least with the version Slicer-5.11.0-2026-03-20-linux-amd64 it is working with 9 volumes, for e.g.…

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## [Extrac Silhouette point clouds of each sagittal slice](https://discourse.slicer.org/t/extrac-silhouette-point-clouds-of-each-sagittal-slice/48262)

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**Author:** [@mrrezaie](https://discourse.slicer.org/u/mrrezaie)\
**Replies:** 1\
**Last updated:** [September 25, 2026, 11:15am UTC](https://discourse.slicer.org/t/extrac-silhouette-point-clouds-of-each-sagittal-slice/48262 "2026-09-25T11:15:55Z")

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Hi, I’m trying to: convert the segmentation to label map extract the Silhouette (outer contour) in each slice. get the points of the Silhouette create a point cloud from all slices But the output the following Python…

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## [GPA interactive 3D visualization model deformed](https://discourse.slicer.org/t/gpa-interactive-3d-visualization-model-deformed/48280)

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**Author:** [@PitaChib](https://discourse.slicer.org/u/PitaChib)\
**Replies:** 7\
**Last updated:** [September 25, 2026, 5:12am UTC](https://discourse.slicer.org/t/gpa-interactive-3d-visualization-model-deformed/48280 "2026-09-25T05:12:03Z")

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Thanks ahead of time, been scratching my head about this for a day so I think it’s time to ask… I’m trying to generate animation of PC warping on my closest to mean shape model (a rodent brain), and when I loaded the re…

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## [New modules for generation CFD-simulation-ready meshes](https://discourse.slicer.org/t/new-modules-for-generation-cfd-simulation-ready-meshes/48250)

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**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 1\
**Last updated:** [September 24, 2026, 2:03pm UTC](https://discourse.slicer.org/t/new-modules-for-generation-cfd-simulation-ready-meshes/48250 "2026-09-24T14:03:18Z")

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I’m happy to share that we have completed development of a set of modules to generate CFD-simulation-ready mesh from image segmentation. The work has been largely based on the VMTK toolkit, exposing its existing feature…

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## [Exporting a ".seg.nrrd" Segmentation with Extent of Original Image](https://discourse.slicer.org/t/exporting-a-seg-nrrd-segmentation-with-extent-of-original-image/36996)

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**Author:** [@sjanko2](https://discourse.slicer.org/u/sjanko2)\
**Replies:** 1\
**Last updated:** [September 24, 2026, 6:51am UTC](https://discourse.slicer.org/t/exporting-a-seg-nrrd-segmentation-with-extent-of-original-image/36996 "2026-09-24T06:51:42Z")

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Hello, I am new to posting to this forum, so please let me know if this question is in the right place! I have a labelmapvolume node (“atlas”) and a volume node (“ghost”) within my scene. I’d like to export the labels …

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## [extensions have been installed but are not showing up under 'Welcome to Slicer' dropdown](https://discourse.slicer.org/t/extensions-have-been-installed-but-are-not-showing-up-under-welcome-to-slicer-dropdown/48244)

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**Author:** [@julian.macdonald](https://discourse.slicer.org/u/julian.macdonald)\
**Replies:** 2\
**Last updated:** [September 23, 2026, 3:34pm UTC](https://discourse.slicer.org/t/extensions-have-been-installed-but-are-not-showing-up-under-welcome-to-slicer-dropdown/48244 "2026-09-23T15:34:04Z")

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Hi. Hoping someone can help. I’ve installed 3DSlicer onto work laptop and have added various extensions (OpenDose3D, SlicerElastix and SlicerRT as examples) manually. They show up in ‘Manage Extensions’ (although they …

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## [Glitch Black screen with white arrow intermittently why?](https://discourse.slicer.org/t/glitch-black-screen-with-white-arrow-intermittently-why/48247)

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**Author:** [@MaxFacRad](https://discourse.slicer.org/u/MaxFacRad)\
**Replies:** 1\
**Last updated:** [September 23, 2026, 2:48pm UTC](https://discourse.slicer.org/t/glitch-black-screen-with-white-arrow-intermittently-why/48247 "2026-09-23T14:48:49Z")

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I keep getting a black screen with a white arrow and it comes and goes constantly and sometimes the screen freezes with it on why is 3D Slicer doing this?

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## [Aruco navigation, camera Intel realsense d415](https://discourse.slicer.org/t/aruco-navigation-camera-intel-realsense-d415/48245)

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**Author:** [@D.i\_V](https://discourse.slicer.org/u/D.i_V)\
**Replies:** 0\
**Last updated:** [September 23, 2026, 2:47pm UTC](https://discourse.slicer.org/t/aruco-navigation-camera-intel-realsense-d415/48245 "2026-09-23T14:47:48Z")

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Hello! I am developing a navigation system model using ArUco markers. Configuration file - Optical marker tracker using MMF video from plus toolkit 2.8. I calibrated the camera using a chessboard pattern. The video in 3D…

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## [Measuring the volume of the fossa indent of bird skulls from a 3D mesh image](https://discourse.slicer.org/t/measuring-the-volume-of-the-fossa-indent-of-bird-skulls-from-a-3d-mesh-image/48236)

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**Author:** [@tami\_evans](https://discourse.slicer.org/u/tami_evans)\
**Replies:** 0\
**Last updated:** [September 23, 2026, 2:30am UTC](https://discourse.slicer.org/t/measuring-the-volume-of-the-fossa-indent-of-bird-skulls-from-a-3d-mesh-image/48236 "2026-09-23T02:30:53Z")

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New user here :slight\_smile: I am trying to measure the volume of the fossa in bird skulls from a 3D mesh scan, I believe I need to cap the indent with a closed curve and go from there, but I am a little lost. I have 15…

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## [MacOS arm64 build](https://discourse.slicer.org/t/macos-arm64-build/48188)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 3\
**Last updated:** [September 21, 2026, 2:37am UTC](https://discourse.slicer.org/t/macos-arm64-build/48188 "2026-09-21T02:37:01Z")

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I was able to build the arm64 version of latest preview on my macbook. The startup was phenomenally fast compared intel builds. Is this coincidence (perhaps libraries were cached from the build process), or can we expect…

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## [Mitral valve segmentation : echo or CT-scan?](https://discourse.slicer.org/t/mitral-valve-segmentation-echo-or-ct-scan/48173)

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**Author:** [@Giueva](https://discourse.slicer.org/u/Giueva)\
**Replies:** 2\
**Last updated:** [September 21, 2026, 1:32am UTC](https://discourse.slicer.org/t/mitral-valve-segmentation-echo-or-ct-scan/48173 "2026-09-21T01:32:32Z")

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Hello everyone, i am starting to use SlicerHeart from 3D Slicer. I want to segment the open and closed mitral valve (annulus, mitral leaflet, cordae and papillary muscle). I taught the best was from 3D echo images, but i…

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## [Adding data failed](https://discourse.slicer.org/t/adding-data-failed/48182)

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**Author:** [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\
**Replies:** 10\
**Last updated:** [September 16, 2026, 8:05pm UTC](https://discourse.slicer.org/t/adding-data-failed/48182 "2026-09-16T20:05:28Z")

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Hello, everyone, I’m trying to load a tiff data of 4,6 GB size and this message appears: Any advices?

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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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## [Is there a tool similar to Viewtify 3DCG?](https://discourse.slicer.org/t/is-there-a-tool-similar-to-viewtify-3dcg/45845)

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**Author:** [@eNable\_Polska](https://discourse.slicer.org/u/eNable_Polska)\
**Replies:** 12\
**Last updated:** [September 15, 2026, 2:42am UTC](https://discourse.slicer.org/t/is-there-a-tool-similar-to-viewtify-3dcg/45845 "2026-09-15T02:42:06Z")

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Is there a tool in Slicer that allows me to achieve a similar effect as in the attached image?

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## [How does the Margin (grow/shrink) effect handle anisotropic voxel spacing?](https://discourse.slicer.org/t/how-does-the-margin-grow-shrink-effect-handle-anisotropic-voxel-spacing/48113)

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**Author:** [@Farah\_BH](https://discourse.slicer.org/u/Farah_BH)\
**Replies:** 1\
**Last updated:** [September 14, 2026, 10:10pm UTC](https://discourse.slicer.org/t/how-does-the-margin-grow-shrink-effect-handle-anisotropic-voxel-spacing/48113 "2026-09-14T22:10:31Z")

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Hello, I’m using the Margin effect in Segment Editor to isotropically expand a segment on CT data with anisotropic voxel spacing. When I request a 3.00 mm margin, the UI reports an actual expansion of 2.9 × 2.9 × 2.5 mm…

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## [Correct workflow for loading 4D CT cardiac data](https://discourse.slicer.org/t/correct-workflow-for-loading-4d-ct-cardiac-data/48121)

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**Author:** [@arumiat](https://discourse.slicer.org/u/arumiat)\
**Replies:** 4\
**Last updated:** [September 14, 2026, 8:41am UTC](https://discourse.slicer.org/t/correct-workflow-for-loading-4d-ct-cardiac-data/48121 "2026-09-14T08:41:53Z")

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Hi Slicer Community, I have a .nii file which is a 4D-gated cardiac CT but I am struggling to load it in Slicer in a way whereby I can watch the heart beating. Is there a specific workflow I need to follow. So far I ha…

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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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## [Build 3D Slicer for MacOS arm64?](https://discourse.slicer.org/t/build-3d-slicer-for-macos-arm64/35699)

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**Author:** [@GeneRisi](https://discourse.slicer.org/u/GeneRisi)\
**Replies:** 32\
**Last updated:** [September 11, 2026, 4:59pm UTC](https://discourse.slicer.org/t/build-3d-slicer-for-macos-arm64/35699 "2026-09-11T16:59:46Z")

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PyTorch has support for using the shaders in the M series chips, but to use it, one has to use the arm64 version of Python. Should a native (in this case, M3) build of Slicer3D be possible? If yes, where should I get the…

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