# Support

**URL:** https://discourse.slicer.org/c/support/11.md?no_subcategories=false&page=37

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

**Page:** 38

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## [Undo enabled on an empty segmentation](https://discourse.slicer.org/t/undo-enabled-on-an-empty-segmentation/43332)

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**Author:** [@nhjohnston](https://discourse.slicer.org/u/nhjohnston)\
**Replies:** 7\
**Last updated:** [June 13, 2025, 2:32pm UTC](https://discourse.slicer.org/t/undo-enabled-on-an-empty-segmentation/43332 "2025-06-13T14:32:07Z")

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When completing the following steps, the undo/redo buttons are enabled despite no visible changes being made to the segmentation in the scene. Create a new segmentation Select the erase tool Erase in the scene (undo is…

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## [Cranial Implant Reconstruction](https://discourse.slicer.org/t/cranial-implant-reconstruction/43318)

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**Author:** [@Alina\_Abbas](https://discourse.slicer.org/u/Alina_Abbas)\
**Replies:** 2\
**Last updated:** [June 13, 2025, 2:19pm UTC](https://discourse.slicer.org/t/cranial-implant-reconstruction/43318 "2025-06-13T14:19:52Z")

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Hello everyone, I hope this message finds you well. I am new to 3D Slicer and am using it for cranial implant reconstruction. I have attempted to utilize the scissor and mirror techniques on my image, but I have not ac…

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## [Can't install Total Segmentor](https://discourse.slicer.org/t/cant-install-total-segmentor/43313)

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**Author:** [@kopachini](https://discourse.slicer.org/u/kopachini)\
**Replies:** 3\
**Last updated:** [June 13, 2025, 6:40am UTC](https://discourse.slicer.org/t/cant-install-total-segmentor/43313 "2025-06-13T06:40:17Z")

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Hello everyone. It seems I can’t install Total segmentor. I used it on my older, less powerful laptop but fast version, but now I am not able to install it. This is the error I get. I have Lenovo Legion i9 14900HX …

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## [Segmentation of swim bladders in micro-CT scans](https://discourse.slicer.org/t/segmentation-of-swim-bladders-in-micro-ct-scans/43325)

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**Author:** [@BennyShoe](https://discourse.slicer.org/u/BennyShoe)\
**Replies:** 2\
**Last updated:** [June 13, 2025, 12:54am UTC](https://discourse.slicer.org/t/segmentation-of-swim-bladders-in-micro-ct-scans/43325 "2025-06-13T00:54:04Z")

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Hello everyone, I’m new to the Slicer community and currently working on a project involving the segmentation of swim bladders(circled in blue) from fish micro-CT scans. However, I’m running into difficulty due to the l…

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## [Am I able to correct for post-operative brainshift in 3DSlicer?](https://discourse.slicer.org/t/am-i-able-to-correct-for-post-operative-brainshift-in-3dslicer/43337)

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**Author:** [@SegmenterSam](https://discourse.slicer.org/u/SegmenterSam)\
**Replies:** 2\
**Last updated:** [June 12, 2025, 11:24pm UTC](https://discourse.slicer.org/t/am-i-able-to-correct-for-post-operative-brainshift-in-3dslicer/43337 "2025-06-12T23:24:56Z")

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Hello all. I am a student researcher and have found 3DSlicer to be incredibly useful. For my research the goal is to overlay a post-operative segmentation of a resection cavity over the pre-operative segmentation of a g…

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## [Tutorial on creating rCBV map from Perfusion MRI?](https://discourse.slicer.org/t/tutorial-on-creating-rcbv-map-from-perfusion-mri/43336)

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**Author:** [@SegmenterSam](https://discourse.slicer.org/u/SegmenterSam)\
**Replies:** 0\
**Last updated:** [June 12, 2025, 9:17pm UTC](https://discourse.slicer.org/t/tutorial-on-creating-rcbv-map-from-perfusion-mri/43336 "2025-06-12T21:17:08Z")

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Hello, While I am fairly certain that 3DSlicer can do what I need, I am a bit lost on where to find information on how to do it. I have a series of 950 slides of Perfusion MRI data. As I understand it, I must convert t…

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## [Axial slice colour suddenly pink - how to reset?](https://discourse.slicer.org/t/axial-slice-colour-suddenly-pink-how-to-reset/43329)

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**Author:** [@tcrnscw](https://discourse.slicer.org/u/tcrnscw)\
**Replies:** 4\
**Last updated:** [June 12, 2025, 7:21pm UTC](https://discourse.slicer.org/t/axial-slice-colour-suddenly-pink-how-to-reset/43329 "2025-06-12T19:21:21Z")

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Hello, I’m having an issue with the axial slice view in 5.8.1. It suddenly is loading only this slice plane in bright pink, and I’m not sure what I’ve done or how to fix this. The sagittal and coronal views are still in…

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## [Isocontour between three classes for orbital reconstruction](https://discourse.slicer.org/t/isocontour-between-three-classes-for-orbital-reconstruction/43271)

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**Author:** [@Motrolol](https://discourse.slicer.org/u/Motrolol)\
**Replies:** 3\
**Last updated:** [June 11, 2025, 10:55pm UTC](https://discourse.slicer.org/t/isocontour-between-three-classes-for-orbital-reconstruction/43271 "2025-06-11T22:55:40Z")

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Dear All, I have been reading the forums to improve orbital bone reconstructions, and thank you for the active community to coming together and solutions proposed. I am trying to reconstruct the orbit from CT scans wit…

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## [Importing Segmented Structures from 3D Slicer into Monaco (DICOM Format)](https://discourse.slicer.org/t/importing-segmented-structures-from-3d-slicer-into-monaco-dicom-format/43322)

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**Author:** [@Shmarvinoid](https://discourse.slicer.org/u/Shmarvinoid)\
**Replies:** 1\
**Last updated:** [June 11, 2025, 8:56pm UTC](https://discourse.slicer.org/t/importing-segmented-structures-from-3d-slicer-into-monaco-dicom-format/43322 "2025-06-11T20:56:26Z")

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Good afternoon! I’d like to inquire about how to import segmented structures from 3D Slicer into Monaco (in DICOM) and ensure they are displayed as contours (Structures). I am unsure whether Monaco supports working with…

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## [Hair thickeness measurement](https://discourse.slicer.org/t/hair-thickeness-measurement/43321)

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**Author:** [@AhmedHM](https://discourse.slicer.org/u/AhmedHM)\
**Replies:** 0\
**Last updated:** [June 11, 2025, 3:59pm UTC](https://discourse.slicer.org/t/hair-thickeness-measurement/43321 "2025-06-11T15:59:27Z")

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Hello all, I am a hair researcher and a newbie to Slicer3D. I came to know Slicer3D from the article entitled “Clinical efficacy and safety of low‐dose oral minoxidil versus topical solution in the improvement of androg…

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## [3D visualization of varying BMD](https://discourse.slicer.org/t/3d-visualization-of-varying-bmd/43314)

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**Author:** [@S\_Motch\_Perrine](https://discourse.slicer.org/u/S_Motch_Perrine)\
**Replies:** 1\
**Last updated:** [June 11, 2025, 3:46pm UTC](https://discourse.slicer.org/t/3d-visualization-of-varying-bmd/43314 "2025-06-11T15:46:14Z")

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I am wondering if you have any suggestions for me on how to tackle this task in 3D Slicer. I have four genotypes of mice for a rather complex phenotype, and want to visualize the differences in BMD across all the bones o…

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## [Efficient Segmentation of Fossil Vertebrae from Matrix in 3D Slicer](https://discourse.slicer.org/t/efficient-segmentation-of-fossil-vertebrae-from-matrix-in-3d-slicer/43277)

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**Author:** [@Busra\_Pullu1](https://discourse.slicer.org/u/Busra_Pullu1)\
**Replies:** 2\
**Last updated:** [June 11, 2025, 9:55am UTC](https://discourse.slicer.org/t/efficient-segmentation-of-fossil-vertebrae-from-matrix-in-3d-slicer/43277 "2025-06-11T09:55:34Z")

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Hi all, I’m working with an undergrad student to segment individual fossil vertebrae from a CT-scanned articulated specimen (paleontological data). We’re using 3D Slicer, and the matrix and bone have very similar densit…

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## [Keyboard shortcut to measure plane angles?](https://discourse.slicer.org/t/keyboard-shortcut-to-measure-plane-angles/43299)

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**Author:** [@ben.rodwell](https://discourse.slicer.org/u/ben.rodwell)\
**Replies:** 0\
**Last updated:** [June 10, 2025, 10:54pm UTC](https://discourse.slicer.org/t/keyboard-shortcut-to-measure-plane-angles/43299 "2025-06-10T22:54:31Z")

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I’m trying to make a keyboard shortcut to use the “Measure angle between two markup planes” script in the script repository so that I can quickly measure the angles between planes without having to copy and past the code…

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## [Slicer tools works on the wrong slice](https://discourse.slicer.org/t/slicer-tools-works-on-the-wrong-slice/35415)

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**Author:** [@radiodid](https://discourse.slicer.org/u/radiodid)\
**Replies:** 3\
**Last updated:** [June 10, 2025, 5:34pm UTC](https://discourse.slicer.org/t/slicer-tools-works-on-the-wrong-slice/35415 "2025-06-10T17:34:36Z")

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When I use the Paint or Erase tools, the action takes place on the adjacent slide, not the one I want. And this does not happen with all slices, but only with individual ones, and I cannot find any regularity in this. So…

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## [nrrd segmentation file error](https://discourse.slicer.org/t/nrrd-segmentation-file-error/43292)

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**Author:** [@SDV](https://discourse.slicer.org/u/SDV)\
**Replies:** 0\
**Last updated:** [June 10, 2025, 4:42pm UTC](https://discourse.slicer.org/t/nrrd-segmentation-file-error/43292 "2025-06-10T16:42:08Z")

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Version 5.8.0 Slicer crashed while using paint brush in a segmentation, and now the nrrd segmentation file seems corrupt and I can’t seem to load it in any way. Any help please? The message detail is: Exception thrown…

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## [Question About Threshold Tool in Segmentation](https://discourse.slicer.org/t/question-about-threshold-tool-in-segmentation/43284)

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**Author:** [@Aya\_Gamal](https://discourse.slicer.org/u/Aya_Gamal)\
**Replies:** 2\
**Last updated:** [June 10, 2025, 4:24pm UTC](https://discourse.slicer.org/t/question-about-threshold-tool-in-segmentation/43284 "2025-06-10T16:24:20Z")

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I have a question regarding the threshold tool in segmentation. When I set the threshold value, several segments appear merged together in one segment. I would like to separate each of them into individual segments. Coul…

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## [Multivolume Explorer gives error in 5.4 version,  so does module "sequences" allows to plot time intensity charts from multivolume datasets? ](https://discourse.slicer.org/t/multivolume-explorer-gives-error-in-5-4-version-so-does-module-sequences-allows-to-plot-time-intensity-charts-from-multivolume-datasets/31834)

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**Author:** [@Jakub.Otahal](https://discourse.slicer.org/u/Jakub.Otahal)\
**Replies:** 4\
**Last updated:** [June 10, 2025, 3:50pm UTC](https://discourse.slicer.org/t/multivolume-explorer-gives-error-in-5-4-version-so-does-module-sequences-allows-to-plot-time-intensity-charts-from-multivolume-datasets/31834 "2025-06-10T15:50:40Z")

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Hello everybody, I have used for long time Multivolume Importer and Explorer to view and analyse DCE datasets in Slicer 4.11. Today when I come back to that with new 5.4 version of Slicer I realized that the Multivolume…

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## [Portable 3D Slicer for macOS with Auto-Import DICOM Directory](https://discourse.slicer.org/t/portable-3d-slicer-for-macos-with-auto-import-dicom-directory/43276)

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**Author:** [@Wyatt\_Gray](https://discourse.slicer.org/u/Wyatt_Gray)\
**Replies:** 2\
**Last updated:** [June 10, 2025, 2:01pm UTC](https://discourse.slicer.org/t/portable-3d-slicer-for-macos-with-auto-import-dicom-directory/43276 "2025-06-10T14:01:28Z")

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Introduction: I’m an engineer and have been tasked with sharing a patient’s DICOM dataset with a macOS-based Dr. (expert). The imaging location provided a DICOM directory and an application but users report errors openi…

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## [Saved linearly transformed images change orientation](https://discourse.slicer.org/t/saved-linearly-transformed-images-change-orientation/43250)

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**Author:** [@NinaO](https://discourse.slicer.org/u/NinaO)\
**Replies:** 2\
**Last updated:** [June 10, 2025, 1:25pm UTC](https://discourse.slicer.org/t/saved-linearly-transformed-images-change-orientation/43250 "2025-06-10T13:25:39Z")

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Dear 3D Slicer Community I tried searching through previous topics, but did not find an answer to my problem. I had a few images I needed to manually rotate so they have approximately the same orientation. For this I f…

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## [Mirror landmarks and evaluate mandible asymmetry in DeCA](https://discourse.slicer.org/t/mirror-landmarks-and-evaluate-mandible-asymmetry-in-deca/43177)

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**Author:** [@yijie3091](https://discourse.slicer.org/u/yijie3091)\
**Replies:** 4\
**Last updated:** [June 10, 2025, 7:03am UTC](https://discourse.slicer.org/t/mirror-landmarks-and-evaluate-mandible-asymmetry-in-deca/43177 "2025-06-10T07:03:29Z")

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Dear professor，I have downloaded the DeCA and successfully used it to generate a mean mesh from mandible datasetes，but if I want to evaluate the mandible asymmetry across the midsaggital plane in the “Mirror Data” and “D…

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## [OpenDose3D Compatibility Issue with Latest SlicerElastix Version (AttributeError on Registration)](https://discourse.slicer.org/t/opendose3d-compatibility-issue-with-latest-slicerelastix-version-attributeerror-on-registration/43275)

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**Author:** [@Kumar\_Abhishek](https://discourse.slicer.org/u/Kumar_Abhishek)\
**Replies:** 0\
**Last updated:** [June 9, 2025, 7:42pm UTC](https://discourse.slicer.org/t/opendose3d-compatibility-issue-with-latest-slicerelastix-version-attributeerror-on-registration/43275 "2025-06-09T19:42:01Z")

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Hi team, I’m using OpenDose3D version d73d832 (2025-01-12) on Slicer 5.6, and facing an issue when executing the Registration step. Upon clicking Execute in the Registration tab, I get the following error: AttributeErr…

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## [Importing a 3DSlicer body model into Unreal game engine](https://discourse.slicer.org/t/importing-a-3dslicer-body-model-into-unreal-game-engine/9183)

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**Author:** [@jtle](https://discourse.slicer.org/u/jtle)\
**Replies:** 2\
**Last updated:** [November 18, 2019, 2:37pm UTC](https://discourse.slicer.org/t/importing-a-3dslicer-body-model-into-unreal-game-engine/9183 "2019-11-18T14:37:49Z")

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Is it possible to create a model of a body with all the underlying organs, etc and then import the model into Unreal game engine for further interaction between user and the simulation? And how would the importation be d…

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## [Tangent plane to a centerline](https://discourse.slicer.org/t/tangent-plane-to-a-centerline/20778)

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**Author:** [@bserrano](https://discourse.slicer.org/u/bserrano)\
**Replies:** 7\
**Last updated:** [June 7, 2025, 3:06pm UTC](https://discourse.slicer.org/t/tangent-plane-to-a-centerline/20778 "2025-06-07T15:06:02Z")

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Is there any way to obtain planes tangent to a centerline? Thanks

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## [Dragging OsiriX xml file as segmentation to import into 3D slicer](https://discourse.slicer.org/t/dragging-osirix-xml-file-as-segmentation-to-import-into-3d-slicer/22031)

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**Author:** [@tenzin\_kunkyab](https://discourse.slicer.org/u/tenzin_kunkyab)\
**Replies:** 10\
**Last updated:** [June 7, 2025, 2:12pm UTC](https://discourse.slicer.org/t/dragging-osirix-xml-file-as-segmentation-to-import-into-3d-slicer/22031 "2025-06-07T14:12:32Z")

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I have a file with dicom images (CT volume) and xml as the segmentation (just one xml file), when I drag the whole file into the slicer, only dicom image is shown, I couldn’t get the xml segmentation to be imported. I c…

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## [Ignore or remove a Segment Editor undo state](https://discourse.slicer.org/t/ignore-or-remove-a-segment-editor-undo-state/43220)

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**Author:** [@mh00](https://discourse.slicer.org/u/mh00)\
**Replies:** 3\
**Last updated:** [June 6, 2025, 6:12pm UTC](https://discourse.slicer.org/t/ignore-or-remove-a-segment-editor-undo-state/43220 "2025-06-06T18:12:36Z")

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If I have a workflow like the following: Load CT and create a Segmentation Use Paint effect on red slice Use Paint effect on green slice Set a tag on the first segment of the segmentation node Use Paint effect on y…

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## [Issue with HDBrainExtraction Tool Not Completing – Error Message Appears](https://discourse.slicer.org/t/issue-with-hdbrainextraction-tool-not-completing-error-message-appears/43236)

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**Author:** [@MZA](https://discourse.slicer.org/u/MZA)\
**Replies:** 3\
**Last updated:** [June 7, 2025, 12:03am UTC](https://discourse.slicer.org/t/issue-with-hdbrainextraction-tool-not-completing-error-message-appears/43236 "2025-06-07T00:03:57Z")

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Hi everyone, I’m encountering an issue while using the HDBrainExtraction tool. After selecting the source and output volume and clicking Apply, the process fails to complete. Instead, I get the pop-up error message show…

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## [A  Cube  into segment](https://discourse.slicer.org/t/a-cube-into-segment/43218)

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**Author:** [@Farah\_BH](https://discourse.slicer.org/u/Farah_BH)\
**Replies:** 4\
**Last updated:** [June 6, 2025, 5:14pm UTC](https://discourse.slicer.org/t/a-cube-into-segment/43218 "2025-06-06T17:14:58Z")

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Hello,I created a markup ROI node ( a cube) on a ct volume, and now I want to convert it into a visible segment on that CT volume because I want to modify it. How to do so with the simplest approach?

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## [How to set dimensions and slice thickness when reconstructing FIB stack](https://discourse.slicer.org/t/how-to-set-dimensions-and-slice-thickness-when-reconstructing-fib-stack/43165)

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**Author:** [@Biaxialerzug](https://discourse.slicer.org/u/Biaxialerzug)\
**Replies:** 4\
**Last updated:** [June 6, 2025, 3:25pm UTC](https://discourse.slicer.org/t/how-to-set-dimensions-and-slice-thickness-when-reconstructing-fib-stack/43165 "2025-06-06T15:25:02Z")

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Hi, I’m using 3D Slicer to reconstruct a material volume. The slices of this volume were createt using FIB (Focused Ion Beam) in a SEM. At this point I struggle to set the correct dimensions of my volume. Each image of …

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## [Failed to compute results - Total Segmentator](https://discourse.slicer.org/t/failed-to-compute-results-total-segmentator/40062)

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**Author:** [@Guilherme\_Augusto](https://discourse.slicer.org/u/Guilherme_Augusto)\
**Replies:** 6\
**Last updated:** [June 6, 2025, 9:00am UTC](https://discourse.slicer.org/t/failed-to-compute-results-total-segmentator/40062 "2025-06-06T09:00:27Z")

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Hello, I am trying to use the TotalSegmentator module in Slicer 3D (version 5.7.0) for total body segmentation of a volume. However, when I click “Apply,” I receive the following error: Command ‘\[‘C:/Users/Drsti/AppDat…

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## [Estimating memory required for NNinteractive](https://discourse.slicer.org/t/estimating-memory-required-for-nninteractive/43239)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 2\
**Last updated:** [June 5, 2025, 9:19pm UTC](https://discourse.slicer.org/t/estimating-memory-required-for-nninteractive/43239 "2025-06-05T21:19:02Z")

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Is there a way to predictably calculate the memory required to segment a volume using NNinteractive? For example given the 400x400x400 16 bit volume how much GPU memory would I need. I Trying to figure out via trial and…

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