# Support

**URL:** https://discourse.slicer.org/c/support/11.md?page=239

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

**Page:** 240

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## [Displacement Vector Visualisation](https://discourse.slicer.org/t/displacement-vector-visualisation/6180)

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**Author:** [@GerryG](https://discourse.slicer.org/u/GerryG)\
**Replies:** 15\
**Last updated:** [February 8, 2022, 8:03pm UTC](https://discourse.slicer.org/t/displacement-vector-visualisation/6180 "2022-02-08T20:03:17Z")

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I have a Model read in from a .vtu file in an unstructured grid format. Each point in this unstructured grid has its position data which visualises nicely but it also has a unique PointData Vector associated with it desc…

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## [QVTKWidgetPlugin destructed after ctreating a polydata](https://discourse.slicer.org/t/qvtkwidgetplugin-destructed-after-ctreating-a-polydata/20890)

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**Author:** [@dalbenzioG](https://discourse.slicer.org/u/dalbenzioG)\
**Replies:** 1\
**Last updated:** [February 10, 2022, 8:32am UTC](https://discourse.slicer.org/t/qvtkwidgetplugin-destructed-after-ctreating-a-polydata/20890 "2022-02-10T08:32:37Z")

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Hello, I created the following function that should generate a polydata out of x, y, and z coordinate of points. def createPolyData(x , y , z , maxNumPoints=1e6) : data = np.column\_stack((x.ravel() , y.ravel() , z.…

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## [Issue using Swiss Skull Stripper Module](https://discourse.slicer.org/t/issue-using-swiss-skull-stripper-module/1876)

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**Author:** [@dlevitas](https://discourse.slicer.org/u/dlevitas)\
**Replies:** 13\
**Last updated:** [February 10, 2022, 4:53am UTC](https://discourse.slicer.org/t/issue-using-swiss-skull-stripper-module/1876 "2022-02-10T04:53:58Z")

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Hello, I just started trying out 3D Slicer: currently using version 4.9.0 I thought I entered the correct information into the GUI, but when I went to run it I received the following error: Swiss Skull Stripper standa…

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## [3D CT Backprojection based on flat X-ray images](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883)

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**Author:** [@ferhue](https://discourse.slicer.org/u/ferhue)\
**Replies:** 2\
**Last updated:** [February 9, 2022, 11:28pm UTC](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883 "2022-02-09T23:28:55Z")

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Hello, I am looking for advice regarding CT reconstruction. My dataset is made of 360 X-ray images (flat panel) of an object taken in steps of 1 degree. I also know the source to detector distance. My question if ther…

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## [General question about choosing the right extension for my goal ](https://discourse.slicer.org/t/general-question-about-choosing-the-right-extension-for-my-goal/21882)

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**Author:** [@snipesc](https://discourse.slicer.org/u/snipesc)\
**Replies:** 0\
**Last updated:** [February 9, 2022, 10:38pm UTC](https://discourse.slicer.org/t/general-question-about-choosing-the-right-extension-for-my-goal/21882 "2022-02-09T22:38:50Z")

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I’m a novice so please excuse the broad question. I’m wanting to compare the shape and articulation of two bones. I want to analyze the shape of one bone and where it sits on the articulating bone. I was looking at slice…

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## [Failures due to build order of Slicer CAT with superbuild remote modules](https://discourse.slicer.org/t/failures-due-to-build-order-of-slicer-cat-with-superbuild-remote-modules/21841)

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**Author:** [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Replies:** 12\
**Last updated:** [February 9, 2022, 2:18am UTC](https://discourse.slicer.org/t/failures-due-to-build-order-of-slicer-cat-with-superbuild-remote-modules/21841 "2022-02-09T02:18:46Z")

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For a Slicer CAT (Custom application) that specifies additional remote extension in the main CMakeLists.txt and these remote modules are superbuild type extensions, how should I specify appropriate build dependencies for…

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## [Crop Volume Issue in 4.11](https://discourse.slicer.org/t/crop-volume-issue-in-4-11/21862)

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**Author:** [@sni94](https://discourse.slicer.org/u/sni94)\
**Replies:** 1\
**Last updated:** [February 9, 2022, 12:33am UTC](https://discourse.slicer.org/t/crop-volume-issue-in-4-11/21862 "2022-02-09T00:33:10Z")

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In version 4.11, I try to crop a volume but the resulting volume just looks like a single slice. When I change all my views to view that volume, the position readout in the top right corner of each view only shows -1, 0,…

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## [Is it possible to resample a volume along a different set of axes?](https://discourse.slicer.org/t/is-it-possible-to-resample-a-volume-along-a-different-set-of-axes/21860)

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**Author:** [@MJJ](https://discourse.slicer.org/u/MJJ)\
**Replies:** 1\
**Last updated:** [February 9, 2022, 12:30am UTC](https://discourse.slicer.org/t/is-it-possible-to-resample-a-volume-along-a-different-set-of-axes/21860 "2022-02-09T00:30:22Z")

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I have a scalar volume. I want to resample this volume along a different set of axes using linear interpolation. Is this possible? If so, how? I’ve looked into using slicer.modules.resamplescalarvolume but I can’t se…

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## [maxillary bone segmentation model](https://discourse.slicer.org/t/maxillary-bone-segmentation-model/21823)

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**Author:** [@DrAssadawy](https://discourse.slicer.org/u/DrAssadawy)\
**Replies:** 4\
**Last updated:** [February 8, 2022, 10:35pm UTC](https://discourse.slicer.org/t/maxillary-bone-segmentation-model/21823 "2022-02-08T22:35:58Z")

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Operating system: Slicer version: Expected behavior: Actual behavior:

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## [How to change the scale bar and units in the 2D view area](https://discourse.slicer.org/t/how-to-change-the-scale-bar-and-units-in-the-2d-view-area/21718)

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**Author:** [@steve01](https://discourse.slicer.org/u/steve01)\
**Replies:** 7\
**Last updated:** [February 8, 2022, 8:00pm UTC](https://discourse.slicer.org/t/how-to-change-the-scale-bar-and-units-in-the-2d-view-area/21718 "2022-02-08T20:00:49Z")

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I just finished working in the Segment Editor and I added a scale bar to the red, 2D image. I noticed that the scale bar is very big. The red circle in the image is approximately 300µm in diameter. How do I change the …

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## [segment and label components](https://discourse.slicer.org/t/segment-and-label-components/21853)

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**Author:** [@Lan](https://discourse.slicer.org/u/Lan)\
**Replies:** 2\
**Last updated:** [February 8, 2022, 3:38pm UTC](https://discourse.slicer.org/t/segment-and-label-components/21853 "2022-02-08T15:38:40Z")

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Hi, I am new user and I have a stack of TIFF images generated by neutron computed tomography. I wonder if I can use different colors to label different components of the 3D structure based on the histogram. Thanks for…

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## [Failed in building 3D Slicer on win10 with vs2015x64](https://discourse.slicer.org/t/failed-in-building-3d-slicer-on-win10-with-vs2015x64/10773)

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**Author:** [@sunshine\_boycn](https://discourse.slicer.org/u/sunshine_boycn)\
**Replies:** 9\
**Last updated:** [February 8, 2022, 10:13am UTC](https://discourse.slicer.org/t/failed-in-building-3d-slicer-on-win10-with-vs2015x64/10773 "2022-02-08T10:13:34Z")

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Dear everybody: I am building 3D Slicer 4.11.0 on windows10 for a whole week. But still I met lots of problems and failed. My building process is as follows: System: win10x64 CMake: 3.16.5, self-build with openssl ( b…

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## [Is there a way to adjust the painting area?](https://discourse.slicer.org/t/is-there-a-way-to-adjust-the-painting-area/21804)

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**Author:** [@Jolly\_thoughts](https://discourse.slicer.org/u/Jolly_thoughts)\
**Replies:** 1\
**Last updated:** [February 8, 2022, 6:59am UTC](https://discourse.slicer.org/t/is-there-a-way-to-adjust-the-painting-area/21804 "2022-02-08T06:59:48Z")

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Hi :slight\_smile: I just got to study about 3D slicer, I have a question that I couldn’t solve through googling. I’m currently doing a pulmonary segmentation right now, and I’m working with artery and veins. But the co…

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## [Mesh Statistics does not appear in 4.13.0 version?](https://discourse.slicer.org/t/mesh-statistics-does-not-appear-in-4-13-0-version/21822)

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**Author:** [@Moh\_d\_Al-Watary](https://discourse.slicer.org/u/Moh_d_Al-Watary)\
**Replies:** 3\
**Last updated:** [February 7, 2022, 6:36pm UTC](https://discourse.slicer.org/t/mesh-statistics-does-not-appear-in-4-13-0-version/21822 "2022-02-07T18:36:34Z")

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Dear 3D Slicer experts, I used to use 4.11.2 version and there is Mesh Statistics function in quantifications module , when used 4.13.0 version this function does not appear? how could this be solved? thank you in advan…

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## [Is it possible to export image + segment as .npz image?](https://discourse.slicer.org/t/is-it-possible-to-export-image-segment-as-npz-image/21794)

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**Author:** [@codeenthusiast](https://discourse.slicer.org/u/codeenthusiast)\
**Replies:** 6\
**Last updated:** [February 7, 2022, 5:54pm UTC](https://discourse.slicer.org/t/is-it-possible-to-export-image-segment-as-npz-image/21794 "2022-02-07T17:54:14Z")

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I am working on an image registration platform on VoxelMorph and it can take .npz as input. Is it possible to save the volume and segmentation of an image in 3D slicer as .npz format?

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## [Matching segmentation with the input data](https://discourse.slicer.org/t/matching-segmentation-with-the-input-data/21817)

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**Author:** [@WojtekL](https://discourse.slicer.org/u/WojtekL)\
**Replies:** 1\
**Last updated:** [February 7, 2022, 3:19pm UTC](https://discourse.slicer.org/t/matching-segmentation-with-the-input-data/21817 "2022-02-07T15:19:36Z")

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Hello, as I create the segmentation of the organ that’s spanning over 60 slices of the base image, let’s say slices 4-64, I’d like to save the segmentation in the way that the segmentation slice would match the number o…

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## [Segmentation Fast Marching effect does not work](https://discourse.slicer.org/t/segmentation-fast-marching-effect-does-not-work/21647)

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**Author:** [@javipeina](https://discourse.slicer.org/u/javipeina)\
**Replies:** 6\
**Last updated:** [February 7, 2022, 1:23pm UTC](https://discourse.slicer.org/t/segmentation-fast-marching-effect-does-not-work/21647 "2022-02-07T13:23:28Z")

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Operating system: Mac OS 10.15.7 Slicer version:4.11.20210226 r29738 / 7a593c8 Expected behavior: Segmentation effect fast marching grow a region in contrasted aorta Actual behavior: does nothing at all I have done e…

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## [Grow from seed dosen't work well](https://discourse.slicer.org/t/grow-from-seed-dosent-work-well/21833)

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**Author:** [@jo1](https://discourse.slicer.org/u/jo1)\
**Replies:** 1\
**Last updated:** [February 7, 2022, 9:26am UTC](https://discourse.slicer.org/t/grow-from-seed-dosent-work-well/21833 "2022-02-07T09:26:52Z")

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Hi there Thanks a lot to provide this awesome tool for free. But there are some issues as to segentation. When I paint each three spot just like the same way as he did It doesnt work at all… I’m still s…

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## [How to resume a segmentation in a 3D volume?](https://discourse.slicer.org/t/how-to-resume-a-segmentation-in-a-3d-volume/21773)

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**Author:** [@pycad](https://discourse.slicer.org/u/pycad)\
**Replies:** 2\
**Last updated:** [February 7, 2022, 6:28am UTC](https://discourse.slicer.org/t/how-to-resume-a-segmentation-in-a-3d-volume/21773 "2022-02-07T06:28:08Z")

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Hi there, I am trying to segment some 3D volumes using 3D slicer, but sometimes I can not complete the whole segmentation on the same day and I want to save then complete the segmentation after but I do not know how to …

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## [how to delineate lesions (the regions of interest “ROI” of tumor) in MRI automatically](https://discourse.slicer.org/t/how-to-delineate-lesions-the-regions-of-interest-roi-of-tumor-in-mri-automatically/21834)

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**Author:** [@Miguel\_luciano\_Carca](https://discourse.slicer.org/u/Miguel_luciano_Carca)\
**Replies:** 0\
**Last updated:** [February 7, 2022, 5:49am UTC](https://discourse.slicer.org/t/how-to-delineate-lesions-the-regions-of-interest-roi-of-tumor-in-mri-automatically/21834 "2022-02-07T05:49:50Z")

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Dear I am writing to you to see the possibility that you can help me with an investigation related to the use of the 3d Slicer system. I wanted to know if you know how to delineate lesions (the regions of interest “ROI…

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## [DICOM network retrieve from PACS - selected item and download crash](https://discourse.slicer.org/t/dicom-network-retrieve-from-pacs-selected-item-and-download-crash/21590)

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**Author:** [@skyhsu](https://discourse.slicer.org/u/skyhsu)\
**Replies:** 8\
**Last updated:** [February 7, 2022, 2:05am UTC](https://discourse.slicer.org/t/dicom-network-retrieve-from-pacs-selected-item-and-download-crash/21590 "2022-02-07T02:05:17Z")

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Hi , I am trying to query and retrieve Dicom data from PACS. Slicer Version:4.11.20210226 Win-10 Pro 64 And I have a two questions that I want to ask. please see the attached, the Series Tab Is there anyway to …

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## [Changing the frame number of segmentation](https://discourse.slicer.org/t/changing-the-frame-number-of-segmentation/21366)

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**Author:** [@currychicken](https://discourse.slicer.org/u/currychicken)\
**Replies:** 1\
**Last updated:** [February 5, 2022, 10:34pm UTC](https://discourse.slicer.org/t/changing-the-frame-number-of-segmentation/21366 "2022-02-05T22:34:40Z")

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Hello, Happy new year! I have a segmentation done at an ROI from (lets’ say 50th-100th frame). I realized I have to do segmentation of entire frame from (0 to 100 anyways). But when I load my ROI-segmentation into the …

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## [How to add 3D Slicer extension manually?](https://discourse.slicer.org/t/how-to-add-3d-slicer-extension-manually/21799)

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**Author:** [@MAXFAXSURGEON](https://discourse.slicer.org/u/MAXFAXSURGEON)\
**Replies:** 7\
**Last updated:** [February 5, 2022, 9:39am UTC](https://discourse.slicer.org/t/how-to-add-3d-slicer-extension-manually/21799 "2022-02-05T09:39:06Z")

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I have downloaded 3D Slicer (from the USB) in my work’s PC that using net has a restriction ( where I can not open the download page of 3D Slicer and its extensions) so I need to add the modules extension to be able to f…

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## [List of modules with custom URL handlers](https://discourse.slicer.org/t/list-of-modules-with-custom-url-handlers/21802)

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**Author:** [@swirlsky](https://discourse.slicer.org/u/swirlsky)\
**Replies:** 1\
**Last updated:** [February 4, 2022, 6:10pm UTC](https://discourse.slicer.org/t/list-of-modules-with-custom-url-handlers/21802 "2022-02-04T18:10:40Z")

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Based on this thread I managed to invoke Slicer from Brave browser on Ubuntu and fetch a DICOM study from Orthanc using the slicer://viewer/?studyUID=... custom URL. My question is, if these custom URL handlers of modul…

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## [How to segment two different mandible on two CBCT in different settings and overlay to show difference](https://discourse.slicer.org/t/how-to-segment-two-different-mandible-on-two-cbct-in-different-settings-and-overlay-to-show-difference/21198)

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**Author:** [@Koen](https://discourse.slicer.org/u/Koen)\
**Replies:** 3\
**Last updated:** [February 4, 2022, 12:58pm UTC](https://discourse.slicer.org/t/how-to-segment-two-different-mandible-on-two-cbct-in-different-settings-and-overlay-to-show-difference/21198 "2022-02-04T12:58:04Z")

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Hi all, I have the following question. How can you segment the mandible in two different scan with different settings into one model to show what different there is pre and post surgery. It are two cone beam CT scans. …

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## [Algorithm used in Watershed effect in Segment Editor](https://discourse.slicer.org/t/algorithm-used-in-watershed-effect-in-segment-editor/21796)

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**Author:** [@MPhilip](https://discourse.slicer.org/u/MPhilip)\
**Replies:** 3\
**Last updated:** [February 4, 2022, 12:54pm UTC](https://discourse.slicer.org/t/algorithm-used-in-watershed-effect-in-segment-editor/21796 "2022-02-04T12:54:53Z")

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@lassoan could you please guide me to relevant documentation of the watershed effect implemented on the 3D slicer detailing the algorithm implemented? Thanks

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## [Slicer not starting on Linux (Qt plugin issue)](https://discourse.slicer.org/t/slicer-not-starting-on-linux-qt-plugin-issue/18856)

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**Author:** [@perecanals](https://discourse.slicer.org/u/perecanals)\
**Replies:** 3\
**Last updated:** [July 21, 2021, 1:31pm UTC](https://discourse.slicer.org/t/slicer-not-starting-on-linux-qt-plugin-issue/18856 "2021-07-21T13:31:00Z")

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Hi, OS: Linux (Ubuntu 20.04) Slicer version (current stable release): Slicer-4.11.20210226-linux-amd64 I am trying to start Slicer after the usual download and extraction process and this error appears: qt.qpa.plugin…

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## [The SegmentationWizard extension is not loaded after install](https://discourse.slicer.org/t/the-segmentationwizard-extension-is-not-loaded-after-install/21788)

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**Author:** [@john92312](https://discourse.slicer.org/u/john92312)\
**Replies:** 1\
**Last updated:** [February 4, 2022, 5:47am UTC](https://discourse.slicer.org/t/the-segmentationwizard-extension-is-not-loaded-after-install/21788 "2022-02-04T05:47:31Z")

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Hi, I am having a issue of launching the extension “segmentationwizard” in 3d slicer version 4.11.20210226. It can not be found in the drop down list and show “SegmentationWizard module is not loaded” after I manually s…

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## [How to save ThinPlateSplineTransform (from IGT Fiducial registration) as a deformation field?](https://discourse.slicer.org/t/how-to-save-thinplatesplinetransform-from-igt-fiducial-registration-as-a-deformation-field/21795)

<div class="topic-metadata">

**Author:** [@Mukund](https://discourse.slicer.org/u/Mukund)\
**Replies:** 1\
**Last updated:** [February 4, 2022, 3:51am UTC](https://discourse.slicer.org/t/how-to-save-thinplatesplinetransform-from-igt-fiducial-registration-as-a-deformation-field/21795 "2022-02-04T03:51:35Z")

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Hi, I was able to successfully use IGT Fiducial registration wizard for manually registering images (with “Transform” option set to “Warping”, which uses thin plate splines) . Next I would like to use the generated trans…

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## [Loaded models are sometimes in different coordinate system, and sometimes not. What exactly is going on?](https://discourse.slicer.org/t/loaded-models-are-sometimes-in-different-coordinate-system-and-sometimes-not-what-exactly-is-going-on/21792)

<div class="topic-metadata">

**Author:** [@MJJ](https://discourse.slicer.org/u/MJJ)\
**Replies:** 8\
**Last updated:** [February 4, 2022, 1:14am UTC](https://discourse.slicer.org/t/loaded-models-are-sometimes-in-different-coordinate-system-and-sometimes-not-what-exactly-is-going-on/21792 "2022-02-04T01:14:40Z")

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Operating system: Windows Slicer version: 4.11.20210226 Expected behavior: A model should be loaded into a consistent coordinate system Actual behavior: When I load some models, it appears to interpret the vertices as…

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