# Support

**URL:** https://discourse.slicer.org/c/support/11.md?page=180

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

**Page:** 181

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## [Fuse and register 2 MR Sequences covering different anatomical regions](https://discourse.slicer.org/t/fuse-and-register-2-mr-sequences-covering-different-anatomical-regions/27686)

<div class="topic-metadata">

**Author:** [@Tatyana\_Ivanovskaya](https://discourse.slicer.org/u/Tatyana_Ivanovskaya)\
**Replies:** 4\
**Last updated:** [February 11, 2023, 9:24am UTC](https://discourse.slicer.org/t/fuse-and-register-2-mr-sequences-covering-different-anatomical-regions/27686 "2023-02-11T09:24:08Z")

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Operating system: Ubuntu 20.04 Slicer version: 5.2.1 Dear All, i have 2 MR T1-weighted sequences from the same patient. One sequence is 1x1x1 mm^3 head scan, the other is a neck scan with a resolution 0.78x0.78x4.8 m…

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## [ERROR loading a file on Mac related with Node](https://discourse.slicer.org/t/error-loading-a-file-on-mac-related-with-node/27215)

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**Author:** [@Adriana\_Rojas\_Garcia](https://discourse.slicer.org/u/Adriana_Rojas_Garcia)\
**Replies:** 2\
**Last updated:** [January 12, 2023, 5:54pm UTC](https://discourse.slicer.org/t/error-loading-a-file-on-mac-related-with-node/27215 "2023-01-12T17:54:44Z")

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Problem report for Slicer 5.2.1 macosx-amd64: I try to charge a mrml file and the following errors appear: ERROR: In /Volumes/D/S/S-0/Libs/MRML/Core/vtkMRMLParser.cxx, line 139 vtkMRMLParser (0x600003edc840): Failed t…

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## [How do I import external modules to 3d slicer?](https://discourse.slicer.org/t/how-do-i-import-external-modules-to-3d-slicer/27733)

<div class="topic-metadata">

**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 1\
**Last updated:** [February 10, 2023, 3:09pm UTC](https://discourse.slicer.org/t/how-do-i-import-external-modules-to-3d-slicer/27733 "2023-02-10T15:09:32Z")

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Operating system: window 10 Slicer version: 5.2.1 When creating extension code, import external libraries (e.g paramiko, etc) as follows. # some extension codes import paramiko import .... In a general IDE, a virtu…

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## [SlicerRT Defining Margins](https://discourse.slicer.org/t/slicerrt-defining-margins/20776)

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**Author:** [@Maharshi\_Panchal](https://discourse.slicer.org/u/Maharshi_Panchal)\
**Replies:** 5\
**Last updated:** [February 10, 2023, 11:53am UTC](https://discourse.slicer.org/t/slicerrt-defining-margins/20776 "2023-02-10T11:53:44Z")

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Hello, Our team has been working to improve the delineation of tumors to guide better radiation planning. We have been looking at the 3DSlicer extension “SlicerRT” you created as a method of defining tumor margins, but …

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## [Plus Server error when connecting NDI Aurora tracker to Slicer](https://discourse.slicer.org/t/plus-server-error-when-connecting-ndi-aurora-tracker-to-slicer/27729)

<div class="topic-metadata">

**Author:** [@sm-philips](https://discourse.slicer.org/u/sm-philips)\
**Replies:** 1\
**Last updated:** [February 9, 2023, 7:53pm UTC](https://discourse.slicer.org/t/plus-server-error-when-connecting-ndi-aurora-tracker-to-slicer/27729 "2023-02-09T19:53:37Z")

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Hi, I have been trying to connect a NDI Aurora tracker to Slicer. Initially I just want to visualize the points coming in from the tracker in 3D space. I have couple of issues I am running into. The Plus Server launch…

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## [Modules installed from extensions do not show up during search](https://discourse.slicer.org/t/modules-installed-from-extensions-do-not-show-up-during-search/27594)

<div class="topic-metadata">

**Author:** [@sm-philips](https://discourse.slicer.org/u/sm-philips)\
**Replies:** 10\
**Last updated:** [February 9, 2023, 6:58pm UTC](https://discourse.slicer.org/t/modules-installed-from-extensions-do-not-show-up-during-search/27594 "2023-02-09T18:58:40Z")

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Operating system: Windows 10 Slicer version: Slicer 5.3.0 and 5.2.1 Expected behavior: Installed extension should show up when I search for modules after Slicer restart Actual behavior: I cannot use online extension i…

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## [Classify voxels via a predefined threshold](https://discourse.slicer.org/t/classify-voxels-via-a-predefined-threshold/27308)

<div class="topic-metadata">

**Author:** [@AmandineG](https://discourse.slicer.org/u/AmandineG)\
**Replies:** 10\
**Last updated:** [February 9, 2023, 4:58pm UTC](https://discourse.slicer.org/t/classify-voxels-via-a-predefined-threshold/27308 "2023-02-09T16:58:36Z")

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Hi, I am a user of 3Dslicer Mac version 5.2.1, with MarkUpsToModel, Sandbox and SegmentEditorExtraEffects extensions. I used the threshold tool on a paralumbar muscle after obtaining its volume and extraction but it di…

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## [Is there a Web-based plug-in for project management of annotators/labelers?](https://discourse.slicer.org/t/is-there-a-web-based-plug-in-for-project-management-of-annotators-labelers/27661)

<div class="topic-metadata">

**Author:** [@Helen\_Vu](https://discourse.slicer.org/u/Helen_Vu)\
**Replies:** 11\
**Last updated:** [February 9, 2023, 8:30am UTC](https://discourse.slicer.org/t/is-there-a-web-based-plug-in-for-project-management-of-annotators-labelers/27661 "2023-02-09T08:30:01Z")

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We are labeling a large project with multiple labelers but are downloading the images onto Dropbox. Our reviewers then have to open Dropbox to review the images. Is there a web-based project management platform where co…

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## [Gradient Opacity in Volume Rendering](https://discourse.slicer.org/t/gradient-opacity-in-volume-rendering/25233)

<div class="topic-metadata">

**Author:** [@user4](https://discourse.slicer.org/u/user4)\
**Replies:** 10\
**Last updated:** [February 8, 2023, 8:53pm UTC](https://discourse.slicer.org/t/gradient-opacity-in-volume-rendering/25233 "2023-02-08T20:53:29Z")

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Hi,all. What’s the exactly meaning of gradient here?In 2D image,gradient usually calculated with Sobel operator,with a specified kernel(convolution).However,I am not familiar with the gradient in 3D image here.While we …

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## [Very long computation time in Segment Editor when using Local threshold or Smoothing](https://discourse.slicer.org/t/very-long-computation-time-in-segment-editor-when-using-local-threshold-or-smoothing/27687)

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**Author:** [@Gening\_Dong](https://discourse.slicer.org/u/Gening_Dong)\
**Replies:** 4\
**Last updated:** [February 8, 2023, 8:05pm UTC](https://discourse.slicer.org/t/very-long-computation-time-in-segment-editor-when-using-local-threshold-or-smoothing/27687 "2023-02-08T20:05:39Z")

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Hi all, I’m using the latest release of Slicer (5.2.1) on a Windows 11 system. My laptop and the lab’s workstation crashed every single time when I trying to use Local Threshold to build a model AND when trying to smoot…

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## [TRUS Reconstruction + Rotational Angle](https://discourse.slicer.org/t/trus-reconstruction-rotational-angle/27692)

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**Author:** [@Michael\_Gorin\_M.D](https://discourse.slicer.org/u/Michael_Gorin_M.D)\
**Replies:** 1\
**Last updated:** [February 8, 2023, 5:48pm UTC](https://discourse.slicer.org/t/trus-reconstruction-rotational-angle/27692 "2023-02-08T17:48:11Z")

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I have a series of images obtained with a linear side-fire transrectal ultrasound probe (I.e sagital images). The series of images was obtained by simply rotating the probe within the rectum. I know the angle of rotation…

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## [Batch Processing error (output folder empty)](https://discourse.slicer.org/t/batch-processing-error-output-folder-empty/27702)

<div class="topic-metadata">

**Author:** [@ahtang617](https://discourse.slicer.org/u/ahtang617)\
**Replies:** 2\
**Last updated:** [February 8, 2023, 5:01pm UTC](https://discourse.slicer.org/t/batch-processing-error-output-folder-empty/27702 "2023-02-08T17:01:53Z")

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Hi, I am trying to use batch processing but somehow run into some errors that I dont know how to solve. At first, I tried to run the script with my database and patitents were loaded but the output folders were all empt…

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## [Installation problem on Windows 11](https://discourse.slicer.org/t/installation-problem-on-windows-11/27683)

<div class="topic-metadata">

**Author:** [@Aiqbal](https://discourse.slicer.org/u/Aiqbal)\
**Replies:** 3\
**Last updated:** [February 8, 2023, 3:26pm UTC](https://discourse.slicer.org/t/installation-problem-on-windows-11/27683 "2023-02-08T15:26:07Z")

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Hi, I am uable to install 3D Slicer on my Windows 11 operating system. I tried the older version as well, but it did not work. It showed that the installer’s integrity check failed. Can anyone help me to overcome this. …

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## [Sharpen Function](https://discourse.slicer.org/t/sharpen-function/27700)

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**Author:** [@chris\_nik](https://discourse.slicer.org/u/chris_nik)\
**Replies:** 3\
**Last updated:** [February 8, 2023, 1:46pm UTC](https://discourse.slicer.org/t/sharpen-function/27700 "2023-02-08T13:46:44Z")

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Hello dear Slicer Community, I have the following question. On other DICOM imaging software (e.g. Planmeca Romexis or Ez3D) there is a “sharpness” slider or a “sharpen” filter with different degrees of sharpness (from “…

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## [How to display a transformed single image in 3D view?](https://discourse.slicer.org/t/how-to-display-a-transformed-single-image-in-3d-view/27658)

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**Author:** [@wrc](https://discourse.slicer.org/u/wrc)\
**Replies:** 3\
**Last updated:** [February 8, 2023, 12:53pm UTC](https://discourse.slicer.org/t/how-to-display-a-transformed-single-image-in-3d-view/27658 "2023-02-08T12:53:30Z")

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Hi, I want to display one single 2D image in 3D view. I input the image as a volume node and apply a transform to it. However, if I try to make rotation / translation, the image in 3D view will become incomplete or disap…

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## [TotalSegmentator error](https://discourse.slicer.org/t/totalsegmentator-error/27701)

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**Author:** [@Ackta](https://discourse.slicer.org/u/Ackta)\
**Replies:** 2\
**Last updated:** [February 8, 2023, 11:56am UTC](https://discourse.slicer.org/t/totalsegmentator-error/27701 "2023-02-08T11:56:47Z")

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Operating system: windows 10 Slicer version: 5.2.1 Expected behavior: Actual behavior: Hi, when i try to use totalsegmentator i\`ve thi error “Traceback (most recent call last): File “C:\\Users\\Administrator\\AppData\\…

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## [Replicating 3Dslicer nrrd header for inference results](https://discourse.slicer.org/t/replicating-3dslicer-nrrd-header-for-inference-results/27659)

<div class="topic-metadata">

**Author:** [@m\_takahashi](https://discourse.slicer.org/u/m_takahashi)\
**Replies:** 1\
**Last updated:** [February 8, 2023, 11:49am UTC](https://discourse.slicer.org/t/replicating-3dslicer-nrrd-header-for-inference-results/27659 "2023-02-08T11:49:49Z")

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Hello all I have created an AI model for organ segmentation. The models input and output are a 2D CT slice and a 2D mask array. These 2D arrays are then joined into a 3D array for the whole CT series. I used 3D Slicer …

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## [vtkSurfaceNets3D in Slicer?](https://discourse.slicer.org/t/vtksurfacenets3d-in-slicer/27690)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 1\
**Last updated:** [February 8, 2023, 12:15am UTC](https://discourse.slicer.org/t/vtksurfacenets3d-in-slicer/27690 "2023-02-08T00:15:43Z")

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vtkSurfaceNets3D, a new iso-contouring filter, is available in VTK. Will said it is planned to be used in Slicer. It sounds like it should significantly speed up label map to surface conversion, as it can also do smoothi…

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## [Reformat module keeps switching images back](https://discourse.slicer.org/t/reformat-module-keeps-switching-images-back/27691)

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**Author:** [@scrmc](https://discourse.slicer.org/u/scrmc)\
**Replies:** 1\
**Last updated:** [February 7, 2023, 9:59pm UTC](https://discourse.slicer.org/t/reformat-module-keeps-switching-images-back/27691 "2023-02-07T21:59:31Z")

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Hi all, I’m experiencing a somewhat strange issue with the Reformat module. Although I know it isn’t recommended, I unfortunately must read .mat files into Slicer. For some reason these are rotated when I first read the…

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## ["Spatial Cell Data" from a mesh: from Slicer to Pyvista](https://discourse.slicer.org/t/spatial-cell-data-from-a-mesh-from-slicer-to-pyvista/27660)

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**Author:** [@luke90](https://discourse.slicer.org/u/luke90)\
**Replies:** 4\
**Last updated:** [February 7, 2023, 6:52pm UTC](https://discourse.slicer.org/t/spatial-cell-data-from-a-mesh-from-slicer-to-pyvista/27660 "2023-02-07T18:52:08Z")

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I exported a Cartesian 4D echo images by Philips QLAB and I converted them using the module \[Philips 4D US DICOM patcher\]. Then I exported the US volume in a nrrd file into Pyvista for 3D analysis. Reading the mesh (Unif…

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## [Segmentation of multi volume sequence](https://discourse.slicer.org/t/segmentation-of-multi-volume-sequence/5187)

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**Author:** [@Melanie](https://discourse.slicer.org/u/Melanie)\
**Replies:** 3\
**Last updated:** [December 27, 2018, 6:24am UTC](https://discourse.slicer.org/t/segmentation-of-multi-volume-sequence/5187 "2018-12-27T06:24:34Z")

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Hi , I am trying to segment bone from 4D Ct - multivolume sequence. Because of the displacement of bone from frame 1 to2 and thereafter , I cannot do one frame and do a registration. Looks like I have to manuallu segmen…

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## [How to apply "Center view" without hidden nodes?](https://discourse.slicer.org/t/how-to-apply-center-view-without-hidden-nodes/27595)

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**Author:** [@wrc](https://discourse.slicer.org/u/wrc)\
**Replies:** 1\
**Last updated:** [February 6, 2023, 6:59pm UTC](https://discourse.slicer.org/t/how-to-apply-center-view-without-hidden-nodes/27595 "2023-02-06T18:59:47Z")

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Hello. There are several hidden nodes in my scene. I want to apply “Center view” without these hidden nodes. Is there any method? (I cannot delete these nodes.) Thank you.

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## [Performance issues on Mac M1?](https://discourse.slicer.org/t/performance-issues-on-mac-m1/22564)

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**Author:** [@bpjohannessen](https://discourse.slicer.org/u/bpjohannessen)\
**Replies:** 13\
**Last updated:** [February 6, 2023, 6:54pm UTC](https://discourse.slicer.org/t/performance-issues-on-mac-m1/22564 "2023-02-06T18:54:30Z")

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Hello everybody. I’m using 3D Slicer 4.11.20210226 (latest at time of writing) on my Windows PC without any performance issues, and I can segment CT scans (thorax, abdomen, wrists, etc) without any performance issues. U…

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## [Looking for CBCT  about mandibular and maxillar bones to study. transformation for chirurgical workflow](https://discourse.slicer.org/t/looking-for-cbct-about-mandibular-and-maxillar-bones-to-study-transformation-for-chirurgical-workflow/27664)

<div class="topic-metadata">

**Author:** [@ortho3d](https://discourse.slicer.org/u/ortho3d)\
**Replies:** 1\
**Last updated:** [February 6, 2023, 5:46pm UTC](https://discourse.slicer.org/t/looking-for-cbct-about-mandibular-and-maxillar-bones-to-study-transformation-for-chirurgical-workflow/27664 "2023-02-06T17:46:34Z")

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Hi I’m Looking for some CBCT about whole mandibular and maxillar bones (the purpose is to study. transformation for chirurgical workflow). Do you have a link to find them. Best regards

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## [Segmentation of artificially created surfaces](https://discourse.slicer.org/t/segmentation-of-artificially-created-surfaces/27662)

<div class="topic-metadata">

**Author:** [@JonathanLV](https://discourse.slicer.org/u/JonathanLV)\
**Replies:** 2\
**Last updated:** [February 6, 2023, 2:24pm UTC](https://discourse.slicer.org/t/segmentation-of-artificially-created-surfaces/27662 "2023-02-06T14:24:32Z")

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Hello, I’ve generated a segment of an endocast from a fossil. The thing is that there are holes in the skull I’ve used, so the module tried to interpolate the surface, creating artificial part in this segment. I’d like …

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## [When install the module SlicerHeart, 3D Slicer start very slowly](https://discourse.slicer.org/t/when-install-the-module-slicerheart-3d-slicer-start-very-slowly/27653)

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**Author:** [@slicer365](https://discourse.slicer.org/u/slicer365)\
**Replies:** 1\
**Last updated:** [February 6, 2023, 1:41pm UTC](https://discourse.slicer.org/t/when-install-the-module-slicerheart-3d-slicer-start-very-slowly/27653 "2023-02-06T13:41:30Z")

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When install the module SlicerHeart ,the 3Dslicer start very slowly, the problem occur in the stable version and latest version.

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## [Importing a segmentation onto a cropped volume](https://discourse.slicer.org/t/importing-a-segmentation-onto-a-cropped-volume/1100)

<div class="topic-metadata">

**Author:** [@stevenagl12](https://discourse.slicer.org/u/stevenagl12)\
**Replies:** 6\
**Last updated:** [February 6, 2023, 1:34pm UTC](https://discourse.slicer.org/t/importing-a-segmentation-onto-a-cropped-volume/1100 "2023-02-06T13:34:47Z")

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I have a cropped volume that I am trying to import the segmentation I performed on the main volume to. Is there an easy way to do this without registration?

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## [How can I add an axis of rotation about the center of mass to the model?](https://discourse.slicer.org/t/how-can-i-add-an-axis-of-rotation-about-the-center-of-mass-to-the-model/27599)

<div class="topic-metadata">

**Author:** [@q2577040659](https://discourse.slicer.org/u/q2577040659)\
**Replies:** 4\
**Last updated:** [February 6, 2023, 1:40am UTC](https://discourse.slicer.org/t/how-can-i-add-an-axis-of-rotation-about-the-center-of-mass-to-the-model/27599 "2023-02-06T01:40:08Z")

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How can I add an axis of rotation about the center of mass to the model?

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## [There is no the Slicer IGT module in the latest version](https://discourse.slicer.org/t/there-is-no-the-slicer-igt-module-in-the-latest-version/27636)

<div class="topic-metadata">

**Author:** [@slicer365](https://discourse.slicer.org/u/slicer365)\
**Replies:** 2\
**Last updated:** [February 5, 2023, 10:21pm UTC](https://discourse.slicer.org/t/there-is-no-the-slicer-igt-module-in-the-latest-version/27636 "2023-02-05T22:21:28Z")

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## [Combining Segmentations in Slicer](https://discourse.slicer.org/t/combining-segmentations-in-slicer/27634)

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**Author:** [@nysfour](https://discourse.slicer.org/u/nysfour)\
**Replies:** 2\
**Last updated:** [February 5, 2023, 5:39am UTC](https://discourse.slicer.org/t/combining-segmentations-in-slicer/27634 "2023-02-05T05:39:01Z")

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Hello, if I am using the segment editor module and I have multiple segment layers of different portions of an image, is there way to create a new segment layer that will combine all of the portions? For context, I want i…

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