# Support

**URL:** https://discourse.slicer.org/c/support/11.md

[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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## [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:** 15\
**Last updated:** [September 25, 2026, 5:46pm UTC](https://discourse.slicer.org/t/rendering-of-dicom-image-failed-with-more-than-4-volumes-since-version-12/48210 "2026-09-25T17:46:54Z")

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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:** 2\
**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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## [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:** 0\
**Last updated:** [September 23, 2026, 2:47pm UTC](https://discourse.slicer.org/t/newbie-need-annotation-help/48246 "2026-09-23T14:47:58Z")

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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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## [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:** 3\
**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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## [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:** 1\
**Last updated:** [September 14, 2026, 12:55pm UTC](https://discourse.slicer.org/t/how-to-save-volume-property-json-as-a-preset/48139 "2026-09-14T12:55:07Z")

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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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## [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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## [How to extract 2D vessels quickly and accurately?](https://discourse.slicer.org/t/how-to-extract-2d-vessels-quickly-and-accurately/40039)

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**Author:** [@jsalas424](https://discourse.slicer.org/u/jsalas424)\
**Replies:** 4\
**Last updated:** [September 11, 2026, 11:53am UTC](https://discourse.slicer.org/t/how-to-extract-2d-vessels-quickly-and-accurately/40039 "2026-09-11T11:53:04Z")

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Hello, I’m trying to segment out the left anterior descending coronary artery from a contrast enhanced XR image. The goal is to calculate the surface area of the vessel, and then compare this longitudinally within patie…

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## [Compatibility with IBM SPSS Statistics](https://discourse.slicer.org/t/compatibility-with-ibm-spss-statistics/48115)

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**Author:** [@epalthek727](https://discourse.slicer.org/u/epalthek727)\
**Replies:** 1\
**Last updated:** [September 11, 2026, 8:29am UTC](https://discourse.slicer.org/t/compatibility-with-ibm-spss-statistics/48115 "2026-09-11T08:29:54Z")

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Hello, I would like to install and use 3D Slicer and IBM SPSS Statistics on the same Windows computer. Could these programs conflict with each other or cause performance or installation issues? Are there any precautions …

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## [Need CT scans with leksell localizer for validating the transformation to leksell frame co-ordinates in my extension](https://discourse.slicer.org/t/need-ct-scans-with-leksell-localizer-for-validating-the-transformation-to-leksell-frame-co-ordinates-in-my-extension/48116)

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**Author:** [@Victor\_Wayne](https://discourse.slicer.org/u/Victor_Wayne)\
**Replies:** 0\
**Last updated:** [September 11, 2026, 5:34am UTC](https://discourse.slicer.org/t/need-ct-scans-with-leksell-localizer-for-validating-the-transformation-to-leksell-frame-co-ordinates-in-my-extension/48116 "2026-09-11T05:34:11Z")

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Hi, I am working on an extension in which I have to convert the volumes from RAS co-ordinate system to leksell frame’s XYZ co-ordinate system. I need test data validate my transformation logic. Is there any place where …

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

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

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

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## [MouseMaster Extension "module is not loaded"](https://discourse.slicer.org/t/mousemaster-extension-module-is-not-loaded/48099)

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**Author:** [@jamie.miller.phd](https://discourse.slicer.org/u/jamie.miller.phd)\
**Replies:** 3\
**Last updated:** [September 9, 2026, 2:10am UTC](https://discourse.slicer.org/t/mousemaster-extension-module-is-not-loaded/48099 "2026-09-09T02:10:53Z")

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Problem report for 3D Slicer 5.12.3 win-amd64: Trying to use the MouseMaster extension, but after downloading from extension manager, and installing from file, there is a error message in the module finder “MouseMaster m…

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## [Whole adult woman body ct scan and mri?](https://discourse.slicer.org/t/whole-adult-woman-body-ct-scan-and-mri/48054)

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**Author:** [@Melodicpinpon](https://discourse.slicer.org/u/Melodicpinpon)\
**Replies:** 4\
**Last updated:** [September 8, 2026, 1:51pm UTC](https://discourse.slicer.org/t/whole-adult-woman-body-ct-scan-and-mri/48054 "2026-09-08T13:51:50Z")

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Hi everyone, Can anyone please tell me where I could download a whole (young healthy) adult woman body ct scan and mri? I would be used to start building a libre 3D atlas of the woman’s anatomy.

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## [4D NifTi flipped and rotated about 90-deg](https://discourse.slicer.org/t/4d-nifti-flipped-and-rotated-about-90-deg/48056)

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**Author:** [@SeunO](https://discourse.slicer.org/u/SeunO)\
**Replies:** 2\
**Last updated:** [September 8, 2026, 12:09pm UTC](https://discourse.slicer.org/t/4d-nifti-flipped-and-rotated-about-90-deg/48056 "2026-09-08T12:09:25Z")

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Hi everyone, Whilst working with some NifTi files, all regular 3DNifti’s seem to match between my application and 3D-Slicer. However, I noticed that the 4D NifTi file I’m working with seems to be flipped in 3D-Slicer ra…

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## [Soft-tissue segmentation: advice needed](https://discourse.slicer.org/t/soft-tissue-segmentation-advice-needed/48060)

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**Author:** [@Toumia\_Bessedik](https://discourse.slicer.org/u/Toumia_Bessedik)\
**Replies:** 0\
**Last updated:** [September 3, 2026, 10:20pm UTC](https://discourse.slicer.org/t/soft-tissue-segmentation-advice-needed/48060 "2026-09-03T22:20:55Z")

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Hello, I would like to get your opinion on an approach I am currently using to refine the segmentation of soft tissues in a head MRI. I used TotalSegmentator (MR) to automatically segment the soft tissues, particularly…

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## [Segmentations Module - Opacity Issue](https://discourse.slicer.org/t/segmentations-module-opacity-issue/48044)

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**Author:** [@Malaquias\_Cerrillo](https://discourse.slicer.org/u/Malaquias_Cerrillo)\
**Replies:** 2\
**Last updated:** [September 3, 2026, 5:15pm UTC](https://discourse.slicer.org/t/segmentations-module-opacity-issue/48044 "2026-09-03T17:15:34Z")

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Hi everybody, i’m experiencing some trouble in the latest version 5.12.3 trying to shift the opacity of the different segmentations. However, I can shift the overall opacity of de segmentation node, does this happens to …

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