# Support **URL:** https://discourse.slicer.org/c/support/11.md?no_subcategories=false&page=11 [Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md) **Page:** 12 --- ## [Multi-Class Segmentation with CT + Aligned STL (Dental Dataset)](https://discourse.slicer.org/t/multi-class-segmentation-with-ct-aligned-stl-dental-dataset/46636)

**Author:** [@abhijeet2410](https://discourse.slicer.org/u/abhijeet2410)\ **Replies:** 0\ **Last updated:** [April 2, 2026, 6:37am UTC](https://discourse.slicer.org/t/multi-class-segmentation-with-ct-aligned-stl-dental-dataset/46636 "2026-04-02T06:37:36Z")

Operating system: Window Slicer version: 3 D Slicer 5. 10.0 :brain: Question: Multi-Class Segmentation with CT + Aligned STL (Dental Dataset) I am working on a dental AI dataset pipeline where I have: CT scan (DICO… --- ## [Brain lobe segmentation](https://discourse.slicer.org/t/brain-lobe-segmentation/46620)

**Author:** [@doctoryfx](https://discourse.slicer.org/u/doctoryfx)\ **Replies:** 1\ **Last updated:** [April 1, 2026, 4:06pm UTC](https://discourse.slicer.org/t/brain-lobe-segmentation/46620 "2026-04-01T16:06:50Z")

Hello everyone, I’m planning to perform brain lobe segmentation on brain MRI images—specifically dividing the whole brain into different lobes such as the frontal lobe, temporal lobe, parietal lobe, and occipital lobe—be… --- ## [Mac preview release fails to load extensions in the Extension Manager](https://discourse.slicer.org/t/mac-preview-release-fails-to-load-extensions-in-the-extension-manager/46612)

**Author:** [@DeepaKrishnaswamy](https://discourse.slicer.org/u/DeepaKrishnaswamy)\ **Replies:** 5\ **Last updated:** [April 1, 2026, 3:46pm UTC](https://discourse.slicer.org/t/mac-preview-release-fails-to-load-extensions-in-the-extension-manager/46612 "2026-04-01T15:46:06Z")

Hi, I installed the latest Slicer Preview Release 2026-03-29 (Slicer 5.11.0 revision 34472) on Mac. I noticed that the extensions are not loading in the Extensions Manager: I checked cdash and noticed many errors, e… --- ## [HOW to create an accurate LF1 osteoptomy in slicer](https://discourse.slicer.org/t/how-to-create-an-accurate-lf1-osteoptomy-in-slicer/46613)

**Author:** [@Drdebraj](https://discourse.slicer.org/u/Drdebraj)\ **Replies:** 0\ **Last updated:** [March 30, 2026, 2:41pm UTC](https://discourse.slicer.org/t/how-to-create-an-accurate-lf1-osteoptomy-in-slicer/46613 "2026-03-30T14:41:44Z")

HOW can create an accurate LF1 osteoptomy in slicer --- ## [Segmentation using curves](https://discourse.slicer.org/t/segmentation-using-curves/46511)

**Author:** [@mrrezaie](https://discourse.slicer.org/u/mrrezaie)\ **Replies:** 23\ **Last updated:** [March 29, 2026, 2:29pm UTC](https://discourse.slicer.org/t/segmentation-using-curves/46511 "2026-03-29T14:29:42Z")

Hello all. I’m trying to do MRI segmentation on a very thin and round structure (knee cartilage). I was wondering if there is any to create a surface on a set of polynomial curves like this: Looking forward to heari… --- ## [Bug in ImportLabelmapToSegmentationNode if multiple parent transforms](https://discourse.slicer.org/t/bug-in-importlabelmaptosegmentationnode-if-multiple-parent-transforms/46524)

**Author:** [@mikebind](https://discourse.slicer.org/u/mikebind)\ **Replies:** 6\ **Last updated:** [March 26, 2026, 10:30pm UTC](https://discourse.slicer.org/t/bug-in-importlabelmaptosegmentationnode-if-multiple-parent-transforms/46524 "2026-03-26T22:30:19Z")

A labelmap imported to a segmentation using ImportLabelmapToSegmentationNode is transformed incorrectly if there are multiple parent transforms soft-applied. I have been using ImportLabelmapToSegmentationNode successfull… --- ## [Merging Patients in DICOM Database](https://discourse.slicer.org/t/merging-patients-in-dicom-database/46580)

**Author:** [@Lesh3203](https://discourse.slicer.org/u/Lesh3203)\ **Replies:** 1\ **Last updated:** [March 26, 2026, 8:18pm UTC](https://discourse.slicer.org/t/merging-patients-in-dicom-database/46580 "2026-03-26T20:18:42Z")

Is there a way to merge patients in the DICOM Database? This patient had imaging done at different facilities, and therefore has different patient IDs. As it’s all the same patient, I would love to merge them into one pa… --- ## [Diffusion tensor estimation from a manually segmented brain mask](https://discourse.slicer.org/t/diffusion-tensor-estimation-from-a-manually-segmented-brain-mask/46587)

**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")

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… --- ## [It's possible to use GE Vscan Ultrasound?](https://discourse.slicer.org/t/its-possible-to-use-ge-vscan-ultrasound/36111)

**Author:** [@ruben99999](https://discourse.slicer.org/u/ruben99999)\ **Replies:** 8\ **Last updated:** [March 26, 2026, 5:33pm UTC](https://discourse.slicer.org/t/its-possible-to-use-ge-vscan-ultrasound/36111 "2026-03-26T17:33:39Z")

Hello, I am a master student who for his thesis project tries to use a GE Vscan Extend Ultrasound to perform a real-time 3D reconstruction of a phantom. However, from what I’ve read, I don’t think this type of scanner is… --- ## ["Editable Area" for segmentation on multiple aspects does not work as intended](https://discourse.slicer.org/t/editable-area-for-segmentation-on-multiple-aspects-does-not-work-as-intended/46563)

**Author:** [@Silver\_Fish](https://discourse.slicer.org/u/Silver_Fish)\ **Replies:** 0\ **Last updated:** [March 25, 2026, 3:57pm UTC](https://discourse.slicer.org/t/editable-area-for-segmentation-on-multiple-aspects-does-not-work-as-intended/46563 "2026-03-25T15:57:15Z")

I’ve been founding out that masking(Editable Area) is not working for multiple aspects. Adjusting models from “grow from seed” using Paint tool: When clicking Editable Area - Inside , I’m not able to Paint anything Vi… --- ## [Can I do segmentation with rtx5060ti?](https://discourse.slicer.org/t/can-i-do-segmentation-with-rtx5060ti/46528)

**Author:** [@leonics](https://discourse.slicer.org/u/leonics)\ **Replies:** 1\ **Last updated:** [March 24, 2026, 1:50pm UTC](https://discourse.slicer.org/t/can-i-do-segmentation-with-rtx5060ti/46528 "2026-03-24T13:50:34Z")

I have PC Spec cpu ryzen 7950x mb : Asus proart x870e gpu : rtx 5060ti 16gb x2 palit infinity3 ram : 16gb x2 bus4800 But I can segmentation only on mu CPU Can it work with my GPU? --- ## [Issue importing mri](https://discourse.slicer.org/t/issue-importing-mri/46544)

**Author:** [@mohammed\_alshakhas](https://discourse.slicer.org/u/mohammed_alshakhas)\ **Replies:** 0\ **Last updated:** [March 24, 2026, 6:57am UTC](https://discourse.slicer.org/t/issue-importing-mri/46544 "2026-03-24T06:57:15Z")

i have this mri which i can view in other viewers . however its not opening in slicer. its not being added in data base --- ## [How to export a NIfTI file with adjusted slice orientation while keeping the original origin?](https://discourse.slicer.org/t/how-to-export-a-nifti-file-with-adjusted-slice-orientation-while-keeping-the-original-origin/46542)

**Author:** [@Ronald\_Lu](https://discourse.slicer.org/u/Ronald_Lu)\ **Replies:** 0\ **Last updated:** [March 24, 2026, 2:02am UTC](https://discourse.slicer.org/t/how-to-export-a-nifti-file-with-adjusted-slice-orientation-while-keeping-the-original-origin/46542 "2026-03-24T02:02:08Z")

Hello everyone, I am using 3D Slicer and would like to rotate the slice views (coordinate axes) to a specific orientation that better matches my anatomical reference. My goal is to export a new .nii file that preserves … --- ## [Image distortion in two of the planes](https://discourse.slicer.org/t/image-distortion-in-two-of-the-planes/46505)

**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")

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

**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")

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… --- ## [areas where I can't draw in ct scans](https://discourse.slicer.org/t/areas-where-i-cant-draw-in-ct-scans/46516)

**Author:** [@RDLmomo](https://discourse.slicer.org/u/RDLmomo)\ **Replies:** 2\ **Last updated:** [March 23, 2026, 10:01am UTC](https://discourse.slicer.org/t/areas-where-i-cant-draw-in-ct-scans/46516 "2026-03-23T10:01:02Z")

Hi Forum, just wanna ask you if you have any suggestions. Sometimes in specific areas of the CTs in the segmentation, I can’t draw on them, I tried many times to change setting but it’ s like I cannot write them, do you … --- ## [Virtual CathLab: new module for C-arm and fluoroscopy imaging simulation](https://discourse.slicer.org/t/virtual-cathlab-new-module-for-c-arm-and-fluoroscopy-imaging-simulation/45355)

**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\ **Replies:** 10\ **Last updated:** [March 20, 2026, 11:34pm UTC](https://discourse.slicer.org/t/virtual-cathlab-new-module-for-c-arm-and-fluoroscopy-imaging-simulation/45355 "2026-03-20T23:34:34Z")

Virtual Cath Lab module has been recently added to SlicerHeart extension. This module simulates monoplane and biplane C-arm systems: provides 3D model of the C-arm, table, patient and generates simulated fluoroscopy imag… --- ## [slicer 3D Hierarchical Registration Error](https://discourse.slicer.org/t/slicer-3d-hierarchical-registration-error/46517)

**Author:** [@Kelly\_Godkin](https://discourse.slicer.org/u/Kelly_Godkin)\ **Replies:** 0\ **Last updated:** [March 20, 2026, 2:34pm UTC](https://discourse.slicer.org/t/slicer-3d-hierarchical-registration-error/46517 "2026-03-20T14:34:38Z")

Hi, I am currently using the slicer 3D Hierarchical Registration module and I am getting the following error message: D:\\a\\im\\build\\cp39-cp39-win\_amd64\\\_deps\\elx-src\\Core\\Main\\itkElastixRegistrationMethod.hxx:389: ITK … --- ## [slicer 3D Hierarchical Registration Error](https://discourse.slicer.org/t/slicer-3d-hierarchical-registration-error/46515)

Hi, I am currently using the slicer 3D Hierarchical Registration module and I am getting the following error message: D:\\a\\im\\build\\cp39-cp39-win\_amd64\\\_deps\\elx-src\\Core\\Main\\itkElastixRegistrationMethod.hxx:389: ITK … --- ## [Generate digitally reconstructed radiograph from 3DCT](https://discourse.slicer.org/t/generate-digitally-reconstructed-radiograph-from-3dct/2010)

**Author:** [@mmtg](https://discourse.slicer.org/u/mmtg)\ **Replies:** 43\ **Last updated:** [March 20, 2026, 11:51am UTC](https://discourse.slicer.org/t/generate-digitally-reconstructed-radiograph-from-3dct/2010 "2026-03-20T11:51:38Z")

Hello again, I would like to create some digitally reconstructed radiographs (DRR) in slicer from come 3DCt data that I have to compare to actual radiograph images that I have acquired. I saw one thread here: that ta… --- ## [3D slicer with TotalSegmentator for abdominal CT](https://discourse.slicer.org/t/3d-slicer-with-totalsegmentator-for-abdominal-ct/46507)

**Author:** [@DiannaB](https://discourse.slicer.org/u/DiannaB)\ **Replies:** 3\ **Last updated:** [March 19, 2026, 9:07pm UTC](https://discourse.slicer.org/t/3d-slicer-with-totalsegmentator-for-abdominal-ct/46507 "2026-03-19T21:07:46Z")

I am honestly don’t even know if this is possible, but I have the DICOM files from my husband’s CT scan (abdominal with contrast) and I would love to be able to 3D model them. He has an intussusception in his small bowel… --- ## [Trigger event when CLI run has completed](https://discourse.slicer.org/t/trigger-event-when-cli-run-has-completed/3774)

**Author:** [@dominicrushforth](https://discourse.slicer.org/u/dominicrushforth)\ **Replies:** 10\ **Last updated:** [March 19, 2026, 1:36pm UTC](https://discourse.slicer.org/t/trigger-event-when-cli-run-has-completed/3774 "2026-03-19T13:36:03Z")

As in the title I would like to be able to trigger some code after a CLI run has completed. I know I can use the parameter wait\_for\_completion=True to pause the code execution, however if I do this the GUI does not upda… --- ## [3D-view segmentation smoothing and stl export](https://discourse.slicer.org/t/3d-view-segmentation-smoothing-and-stl-export/46488)

**Author:** [@Eva91](https://discourse.slicer.org/u/Eva91)\ **Replies:** 1\ **Last updated:** [March 18, 2026, 10:50am UTC](https://discourse.slicer.org/t/3d-view-segmentation-smoothing-and-stl-export/46488 "2026-03-18T10:50:46Z")

Hi, I have a working manual workflow in Slicer, where I load a segmentation, then show it in 3D, and increase the surface smoothness via that tiny arrow on the “Show 3D” button. After that, i export the segmentation to … --- ## [How to handle 3D model that was given to me in DICOM format](https://discourse.slicer.org/t/how-to-handle-3d-model-that-was-given-to-me-in-dicom-format/46438)

**Author:** [@madsmess](https://discourse.slicer.org/u/madsmess)\ **Replies:** 2\ **Last updated:** [March 17, 2026, 8:03pm UTC](https://discourse.slicer.org/t/how-to-handle-3d-model-that-was-given-to-me-in-dicom-format/46438 "2026-03-17T20:03:25Z")

Hi! I was recently given a 3D model from a cardiologist, but it was given to me as a DICOM file. How could I convert/export this model as an STL or other similar format (OBJ, etc.)? I can view it in slicer, although the … --- ## [Scan Misaligned with Global Coordinate System](https://discourse.slicer.org/t/scan-misaligned-with-global-coordinate-system/40349)

**Author:** [@ppech17](https://discourse.slicer.org/u/ppech17)\ **Replies:** 5\ **Last updated:** [March 17, 2026, 7:59pm UTC](https://discourse.slicer.org/t/scan-misaligned-with-global-coordinate-system/40349 "2026-03-17T19:59:31Z")

Hello, I have a question regarding the following image: When I load DICOM data, it is not aligned with the global coordinate system. I’m new to 3D Slicer and have looked at some yt videos about transforms but haven’… --- ## [Citing 3D Slicer in Anatomy papers - occipital condyle morphometry](https://discourse.slicer.org/t/citing-3d-slicer-in-anatomy-papers-occipital-condyle-morphometry/46485)

**Author:** [@thealexshadow23](https://discourse.slicer.org/u/thealexshadow23)\ **Replies:** 1\ **Last updated:** [March 17, 2026, 5:29pm UTC](https://discourse.slicer.org/t/citing-3d-slicer-in-anatomy-papers-occipital-condyle-morphometry/46485 "2026-03-17T17:29:49Z")

Hello everybody! I’m writing a research paper using 3D Slicer for morphometric evaluation of occipital condyle, distance to hypoglossal canal and foramen magnum. I can’t seem to find a lot of research papers that use 3D… --- ## [Extension server is down](https://discourse.slicer.org/t/extension-server-is-down/46478)

**Author:** [@IVarha](https://discourse.slicer.org/u/IVarha)\ **Replies:** 9\ **Last updated:** [March 17, 2026, 2:51pm UTC](https://discourse.slicer.org/t/extension-server-is-down/46478 "2026-03-17T14:51:10Z")

Qt\] Update extension information from server failed: timed out while waiting for server response from https://slicer-packages.kitware.com/api/v1/app/5f4474d0e1d8c75dfc705482/extension \[Qt\] “https://extensions.slicer.org… --- ## [Is the extension page down?](https://discourse.slicer.org/t/is-the-extension-page-down/46486)

**Author:** [@Anupam\_Singh](https://discourse.slicer.org/u/Anupam_Singh)\ **Replies:** 1\ **Last updated:** [March 17, 2026, 2:06pm UTC](https://discourse.slicer.org/t/is-the-extension-page-down/46486 "2026-03-17T14:06:25Z")

Hi Team, I am facing an issue when I open the install extension page i am getting page not found. Earlier same page was working and was able to install extensions. Attaching screenshot of the issue for your reference. … --- ## [Does the resolution change the surface area values?](https://discourse.slicer.org/t/does-the-resolution-change-the-surface-area-values/46472)

**Author:** [@FabricioFO](https://discourse.slicer.org/u/FabricioFO)\ **Replies:** 1\ **Last updated:** [March 16, 2026, 8:29pm UTC](https://discourse.slicer.org/t/does-the-resolution-change-the-surface-area-values/46472 "2026-03-16T20:29:50Z")

Hello, everyone. I noticed that when we reduce the resolution by half in ImageStack, the spacing value doubles. After finishing the segmentations, will the volume and surface area values be the same as if I had used the … --- ## [data disappearing after crop volume](https://discourse.slicer.org/t/data-disappearing-after-crop-volume/46467)

**Author:** [@fergu365](https://discourse.slicer.org/u/fergu365)\ **Replies:** 1\ **Last updated:** [March 16, 2026, 7:38pm UTC](https://discourse.slicer.org/t/data-disappearing-after-crop-volume/46467 "2026-03-16T19:38:09Z")

Every time I attempt to make on ROI and then crop volume, once I hit apply, all the CT data disappears. It’s not just the data outside the ROI (that would make sense), it is the entire scan. I’ve tried to troubleshoot by… [Previous page](https://discourse.slicer.org/c/support/11.md?no_subcategories=false&page=10) [Next page](https://discourse.slicer.org/c/support/11.md?no_subcategories=false&page=12)