# Support

**URL:** https://discourse.slicer.org/c/support/11.md?no_subcategories=false&page=12

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

**Page:** 13

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## [Is the extension page down?](https://discourse.slicer.org/t/is-the-extension-page-down/46486)

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**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")

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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. …

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## [Does the resolution change the surface area values?](https://discourse.slicer.org/t/does-the-resolution-change-the-surface-area-values/46472)

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**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")

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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 …

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## [data disappearing after crop volume](https://discourse.slicer.org/t/data-disappearing-after-crop-volume/46467)

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**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")

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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…

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## [How can I perform segmentation of the masticatory muscles (temporalis, masseter, pterygoids) using MR images?](https://discourse.slicer.org/t/how-can-i-perform-segmentation-of-the-masticatory-muscles-temporalis-masseter-pterygoids-using-mr-images/46466)

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**Author:** [@Alirasat](https://discourse.slicer.org/u/Alirasat)\
**Replies:** 0\
**Last updated:** [March 16, 2026, 6:00pm UTC](https://discourse.slicer.org/t/how-can-i-perform-segmentation-of-the-masticatory-muscles-temporalis-masseter-pterygoids-using-mr-images/46466 "2026-03-16T18:00:50Z")

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I want to perform segmentation of the masticatory muscles (temporalis, masseter, and pterygoids) on 1.5-Tesla MR images, but I have not been able to achieve this using MONAI or TotalSegmentator. I would be very grateful …

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## [Wrong positionning of segments exported to files ](https://discourse.slicer.org/t/wrong-positionning-of-segments-exported-to-files/46439)

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**Author:** [@rbg](https://discourse.slicer.org/u/rbg)\
**Replies:** 3\
**Last updated:** [March 16, 2026, 12:38pm UTC](https://discourse.slicer.org/t/wrong-positionning-of-segments-exported-to-files/46439 "2026-03-16T12:38:42Z")

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Hello, I segmented lesions on DICOM using 3DSlicer 5.10.0. The segments were exported to files with the right reference volume, in NIFTI. The problem is that the orientation of the segmentation is not the good one when…

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## [Approach to extract/segment skull of a MRI scan](https://discourse.slicer.org/t/approach-to-extract-segment-skull-of-a-mri-scan/5677)

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**Author:** [@SvK](https://discourse.slicer.org/u/SvK)\
**Replies:** 5\
**Last updated:** [March 13, 2026, 7:53am UTC](https://discourse.slicer.org/t/approach-to-extract-segment-skull-of-a-mri-scan/5677 "2026-03-13T07:53:41Z")

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Operating system: Linux Slicer version: 4.10 Hey everybody, I am looking for an approach to extract the complete skull reliably and accurately from an MRI of the head. My previous attempts with the Segment Editor and …

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## [Pulling a skull from MR](https://discourse.slicer.org/t/pulling-a-skull-from-mr/38351)

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**Author:** [@BDhoth](https://discourse.slicer.org/u/BDhoth)\
**Replies:** 8\
**Last updated:** [March 13, 2026, 7:52am UTC](https://discourse.slicer.org/t/pulling-a-skull-from-mr/38351 "2026-03-13T07:52:22Z")

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Are there any tips for pulling a skull from MRI images? In this sequence the skull is very comparable in the number as other brain matter/soft tissue.

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## [Reduce brush sphere resolution](https://discourse.slicer.org/t/reduce-brush-sphere-resolution/46365)

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**Author:** [@SANTIAGO\_PENDON\_MING](https://discourse.slicer.org/u/SANTIAGO_PENDON_MING)\
**Replies:** 6\
**Last updated:** [March 12, 2026, 7:29am UTC](https://discourse.slicer.org/t/reduce-brush-sphere-resolution/46365 "2026-03-12T07:29:48Z")

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The goal is to reduce the resolution of the Sphere Brush (i.e., make it more polyhedral). I assume this can be controlled through one or more parameters in the scripted module, but I have not found any settings related …

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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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## [How do I segment dental root canal in 3D slicer? ](https://discourse.slicer.org/t/how-do-i-segment-dental-root-canal-in-3d-slicer/46416)

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**Author:** [@Dr\_Anshuman\_Jha](https://discourse.slicer.org/u/Dr_Anshuman_Jha)\
**Replies:** 0\
**Last updated:** [March 9, 2026, 8:12pm UTC](https://discourse.slicer.org/t/how-do-i-segment-dental-root-canal-in-3d-slicer/46416 "2026-03-09T20:12:31Z")

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How do I segment dental root canal in 3D slicer? I have cbct raw data of cases

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## [Color display error on 3D Volume](https://discourse.slicer.org/t/color-display-error-on-3d-volume/46390)

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**Author:** [@Karuruychi](https://discourse.slicer.org/u/Karuruychi)\
**Replies:** 2\
**Last updated:** [March 9, 2026, 3:35am UTC](https://discourse.slicer.org/t/color-display-error-on-3d-volume/46390 "2026-03-09T03:35:56Z")

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Hello everyone I’m developing an application based on Trame-Slicer, specifically a 3D ROI Cropping feature. Trame-Slicer already supports displaying the ROI box, but when I enable it, my 3D block displays incorrect colo…

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## [Models with topographic information](https://discourse.slicer.org/t/models-with-topographic-information/46387)

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**Author:** [@JaredAmudeo](https://discourse.slicer.org/u/JaredAmudeo)\
**Replies:** 7\
**Last updated:** [March 7, 2026, 5:14pm UTC](https://discourse.slicer.org/t/models-with-topographic-information/46387 "2026-03-07T17:14:20Z")

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Greetings everyone, By any chance, does anyone know how to create this type of model or how to add a topographic scale like the one shown in the attached image? For publications, what I usually do is segment the element…

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## [Agent Skills in Talk2View Extension for 3D Slicer](https://discourse.slicer.org/t/agent-skills-in-talk2view-extension-for-3d-slicer/46409)

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**Author:** [@benzwick](https://discourse.slicer.org/u/benzwick)\
**Replies:** 0\
**Last updated:** [March 7, 2026, 5:14pm UTC](https://discourse.slicer.org/t/agent-skills-in-talk2view-extension-for-3d-slicer/46409 "2026-03-07T17:14:05Z")

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We have integrated Agent Skills into our Talk2View extension for 3D Slicer to automate complex workflows. The Talk2View extension for 3D Slicer can be downloaded from our website here: https://talk2view.com/download …

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## [Margin Tool does not change anything](https://discourse.slicer.org/t/margin-tool-does-not-change-anything/46002)

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**Author:** [@Silver\_Fish](https://discourse.slicer.org/u/Silver_Fish)\
**Replies:** 11\
**Last updated:** [March 6, 2026, 11:07am UTC](https://discourse.slicer.org/t/margin-tool-does-not-change-anything/46002 "2026-03-06T11:07:56Z")

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Hi! I want the brown segmentation shrink a little, and the yellow segmentation grow a little, only on the edges of both segmentations. So I selected “inside all visible segments.” But nothing changes after clicking “App…

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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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## [Import mesh into Slicer Heart device simulator](https://discourse.slicer.org/t/import-mesh-into-slicer-heart-device-simulator/13439)

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**Author:** [@gabccamargo](https://discourse.slicer.org/u/gabccamargo)\
**Replies:** 10\
**Last updated:** [March 6, 2026, 10:30am UTC](https://discourse.slicer.org/t/import-mesh-into-slicer-heart-device-simulator/13439 "2026-03-06T10:30:12Z")

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I use Slicer Heart to simulate transcatheter cardiac device implants. The custom device feature is great but limited. Is it possible to import a new mesh into Slicer Heart to be used as a new device? The deform feature a…

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## [How Does Slicer Handle Image Scaling in Image-to-probe Calibration?](https://discourse.slicer.org/t/how-does-slicer-handle-image-scaling-in-image-to-probe-calibration/46368)

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**Author:** [@daandevlieger2-alt](https://discourse.slicer.org/u/daandevlieger2-alt)\
**Replies:** 3\
**Last updated:** [March 5, 2026, 1:09pm UTC](https://discourse.slicer.org/t/how-does-slicer-handle-image-scaling-in-image-to-probe-calibration/46368 "2026-03-05T13:09:19Z")

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Hi everyone, We are working with 3D Slicer (version 5.8.1), an OptiTrack V120:Trio, and an Telemed ArtUs for 3D freehand ultrasound acquisition. We have repeatedly attempted probe calibration using a stylus-based appro…

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## [Automatic segmentation of the ventricles (brain)](https://discourse.slicer.org/t/automatic-segmentation-of-the-ventricles-brain/45915)

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**Author:** [@Preetham\_Dange](https://discourse.slicer.org/u/Preetham_Dange)\
**Replies:** 7\
**Last updated:** [March 5, 2026, 8:11am UTC](https://discourse.slicer.org/t/automatic-segmentation-of-the-ventricles-brain/45915 "2026-03-05T08:11:07Z")

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Hello everyone, I am currently working on hydrocephalus . I wanted to automatically segment the ventricles (brain) and use the volume statistics for research purposes. I tried MONAI Auto3Dseg and nnUnet but I couldn’t f…

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## [Odd behavior after adding a moving mask in the ANTs extension](https://discourse.slicer.org/t/odd-behavior-after-adding-a-moving-mask-in-the-ants-extension/46117)

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**Author:** [@sulli419](https://discourse.slicer.org/u/sulli419)\
**Replies:** 9\
**Last updated:** [March 4, 2026, 5:52pm UTC](https://discourse.slicer.org/t/odd-behavior-after-adding-a-moving-mask-in-the-ants-extension/46117 "2026-03-04T17:52:15Z")

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I’ve been using the ANTs extension for registering two single-label volumes to eachother with good results. In an attempt to improve registration robustness, I started incorporating fixed and moving masks (FM, MM), but …

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## [Brain CT segmentation - grow from seed leak - rectangle appears](https://discourse.slicer.org/t/brain-ct-segmentation-grow-from-seed-leak-rectangle-appears/46245)

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**Author:** [@mechanical\_orange](https://discourse.slicer.org/u/mechanical_orange)\
**Replies:** 4\
**Last updated:** [March 4, 2026, 12:26pm UTC](https://discourse.slicer.org/t/brain-ct-segmentation-grow-from-seed-leak-rectangle-appears/46245 "2026-03-04T12:26:41Z")

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Operating system: mac os Slicer version: 5.6.2 Expected behavior: grow from seed only segments parts of the brain without the background Actual behavior: grow from seed segments the background in a rectangle form. Hi…

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## [Grow from seed error — exceeded max number of voxels](https://discourse.slicer.org/t/grow-from-seed-error-exceeded-max-number-of-voxels/46371)

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**Author:** [@Antmaker](https://discourse.slicer.org/u/Antmaker)\
**Replies:** 2\
**Last updated:** [March 4, 2026, 12:16pm UTC](https://discourse.slicer.org/t/grow-from-seed-error-exceeded-max-number-of-voxels/46371 "2026-03-04T12:16:03Z")

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I was trying to use the grow-from-seed effect in the Segment Editor module and keep encountering this error. At first I thought this was due to not having enough RAM, thus I’ve increased my system’s memory from 195GB to…

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## [Heavy lag when displaying segmentations via Trame + TotalSegmentator](https://discourse.slicer.org/t/heavy-lag-when-displaying-segmentations-via-trame-totalsegmentator/46353)

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**Author:** [@Karuruychi](https://discourse.slicer.org/u/Karuruychi)\
**Replies:** 3\
**Last updated:** [March 4, 2026, 4:20am UTC](https://discourse.slicer.org/t/heavy-lag-when-displaying-segmentations-via-trame-totalsegmentator/46353 "2026-03-04T04:20:31Z")

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I am developing a web-based medical imaging viewer using Trame-slicer. I used TotalSegmentator to generate anatomical masks and then load these .nii.gz files into the Slicer scene for 3D visualization. Currently, I am l…

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## [Scissors in Segment Editor module seriously lagged in Slicer 5.10.0](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364)

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**Author:** [@VincentYu](https://discourse.slicer.org/u/VincentYu)\
**Replies:** 2\
**Last updated:** [March 3, 2026, 1:02pm UTC](https://discourse.slicer.org/t/scissors-in-segment-editor-module-seriously-lagged-in-slicer-5-10-0/46364 "2026-03-03T13:02:09Z")

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Operating system: Windwos 11; Slicer version: 5.10.0 Recently I update Slicer from 5.8.1 to 5.10.0, and I found that sometimes the scissors in Segment Editor took very long computing time. After several small experimen…

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## [Assistance with Brain MR segmentation? ](https://discourse.slicer.org/t/assistance-with-brain-mr-segmentation/46361)

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**Author:** [@Jack\_Karp](https://discourse.slicer.org/u/Jack_Karp)\
**Replies:** 1\
**Last updated:** [March 2, 2026, 9:17pm UTC](https://discourse.slicer.org/t/assistance-with-brain-mr-segmentation/46361 "2026-03-02T21:17:42Z")

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Hello! I am new to the slicer community. I have tried multiple attempts at segmenting out my brain, however continually fail to achieve the quality I am hoping for. I have watched multiple videos to no avail. The sulci/g…

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## [About image comparison function](https://discourse.slicer.org/t/about-image-comparison-function/46360)

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**Author:** [@ZhouMo](https://discourse.slicer.org/u/ZhouMo)\
**Replies:** 1\
**Last updated:** [March 2, 2026, 7:13pm UTC](https://discourse.slicer.org/t/about-image-comparison-function/46360 "2026-03-02T19:13:49Z")

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Hello all, I am a new user of 3D slicer. Currently, I want to achieve the image comparison function, which means I hope to be able to open two images simultaneously (such as CT images of the same patient at different ti…

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## [Issues with segmentation pixelation and resolution when using separate Axial/Coronal DICOMs.](https://discourse.slicer.org/t/issues-with-segmentation-pixelation-and-resolution-when-using-separate-axial-coronal-dicoms/45752)

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**Author:** [@teakpAUM](https://discourse.slicer.org/u/teakpAUM)\
**Replies:** 10\
**Last updated:** [March 2, 2026, 6:32pm UTC](https://discourse.slicer.org/t/issues-with-segmentation-pixelation-and-resolution-when-using-separate-axial-coronal-dicoms/45752 "2026-03-02T18:32:07Z")

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I’m working on a project to segment structures within the orbit. I’m using fat suppressed T1 weighted images from a database. The MRI DICOM files are downloaded individually e.g. one will be coronal one will be axial. Bu…

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## [Automatic Extract Centerline with VMTK python (auto detect) from trachea segementation](https://discourse.slicer.org/t/automatic-extract-centerline-with-vmtk-python-auto-detect-from-trachea-segementation/46356)

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**Author:** [@hadrien\_calmet](https://discourse.slicer.org/u/hadrien_calmet)\
**Replies:** 0\
**Last updated:** [March 2, 2026, 11:09am UTC](https://discourse.slicer.org/t/automatic-extract-centerline-with-vmtk-python-auto-detect-from-trachea-segementation/46356 "2026-03-02T11:09:58Z")

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Hi everyone. Since several people seem to be working on this without a clear answer, I’m sharing my contribution in case it helps others in the community. Final main script: make\_clean\_centerlines\_zmax\_generic.py Cle…

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## [Synthetic PET from CT ](https://discourse.slicer.org/t/synthetic-pet-from-ct/37066)

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**Author:** [@oismaster](https://discourse.slicer.org/u/oismaster)\
**Replies:** 3\
**Last updated:** [February 28, 2026, 10:26am UTC](https://discourse.slicer.org/t/synthetic-pet-from-ct/37066 "2026-02-28T10:26:21Z")

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This paper ( PMID: \[38471502\] Synthetic PET from CT improves diagnosis and prognosis for lung cancer: Proof of concept - PubMed) describes a process to use a CT to predict what the PET will look like. Is this a useful m…

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## [Install ModalityConverter](https://discourse.slicer.org/t/install-modalityconverter/46308)

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**Author:** [@jmarichal](https://discourse.slicer.org/u/jmarichal)\
**Replies:** 4\
**Last updated:** [February 28, 2026, 10:07am UTC](https://discourse.slicer.org/t/install-modalityconverter/46308 "2026-02-28T10:07:46Z")

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Hi, New user here! I’m trying to download the ModalityConverter extension: GitHub - ciroraggio/SlicerModalityConverter. When trying via the extension manager, I got the following error message. So I went on extensions.…

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## [VMTK tool 3D slicer](https://discourse.slicer.org/t/vmtk-tool-3d-slicer/46330)

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**Author:** [@Tair](https://discourse.slicer.org/u/Tair)\
**Replies:** 1\
**Last updated:** [February 27, 2026, 8:01pm UTC](https://discourse.slicer.org/t/vmtk-tool-3d-slicer/46330 "2026-02-27T20:01:40Z")

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Hello, I started to use the VMTK took and I don’t understand. In my VTMK the only package I see relevant to centerlines are Extract centerlines. I don’t have the centerlines computation. is it the same? why I don’t h…

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