# Support **URL:** https://discourse.slicer.org/c/support/11.md?page=325 [Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md) **Page:** 326 --- ## [Changing names in database](https://discourse.slicer.org/t/changing-names-in-database/13061)
**Author:** [@avrilev](https://discourse.slicer.org/u/avrilev)\ **Replies:** 16\ **Last updated:** [August 22, 2020, 7:53pm UTC](https://discourse.slicer.org/t/changing-names-in-database/13061 "2020-08-22T19:53:24Z")
Hi guys, In the DICOM db, I get some ??? instead of the patient name. Is there a way to amend this? TIA Dr. Avri Lev --- ## [Python interactor : can we increase the item count in the dropdown list?](https://discourse.slicer.org/t/python-interactor-can-we-increase-the-item-count-in-the-dropdown-list/13128)
**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\ **Replies:** 2\ **Last updated:** [August 22, 2020, 6:36pm UTC](https://discourse.slicer.org/t/python-interactor-can-we-increase-the-item-count-in-the-dropdown-list/13128 "2020-08-22T18:36:56Z")
Currently, the dropdown list on TAB key press in the python interactor shows 7 items. Can one increase the number of items to, say, 16 ? By some python code in slicerrc.py ? Just for less scrolling. Thanks. --- ## [How to verify size of .ply model uploaded into Slicer?](https://discourse.slicer.org/t/how-to-verify-size-of-ply-model-uploaded-into-slicer/13133)
**Author:** [@flemingrachelc](https://discourse.slicer.org/u/flemingrachelc)\ **Replies:** 5\ **Last updated:** [August 22, 2020, 6:32pm UTC](https://discourse.slicer.org/t/how-to-verify-size-of-ply-model-uploaded-into-slicer/13133 "2020-08-22T18:32:02Z")
Hello! I was wondering if there is a way to verify the size/scale of a .ply model uploaded directly into 3D Slicer from repositories such as Morphosource? I have the x res, y res, and z res from the specimen page, but a… --- ## [How can I convert vtk.vtkImageData() to an OpenCv Image?](https://discourse.slicer.org/t/how-can-i-convert-vtk-vtkimagedata-to-an-opencv-image/13120)
**Author:** [@apparrilla](https://discourse.slicer.org/u/apparrilla)\ **Replies:** 5\ **Last updated:** [August 21, 2020, 10:44pm UTC](https://discourse.slicer.org/t/how-can-i-convert-vtk-vtkimagedata-to-an-opencv-image/13120 "2020-08-21T22:44:01Z")
I want to work arround with images from slices but I have problems converting them to a cv2 format. Thanks --- ## [Implementing a custom GPU raycasting function](https://discourse.slicer.org/t/implementing-a-custom-gpu-raycasting-function/13055)
**Author:** [@Zerfox](https://discourse.slicer.org/u/Zerfox)\ **Replies:** 9\ **Last updated:** [August 21, 2020, 9:20pm UTC](https://discourse.slicer.org/t/implementing-a-custom-gpu-raycasting-function/13055 "2020-08-21T21:20:45Z")
Dear all, Currently I am working on a 3D Slicer module in which I need to render isosurfaces and silhouettes. Right now I am using vtkOpenGLGPUVolumeRayCastMapper and setting a vtkImageData object as input data. The vo… --- ## [DWI to DTI Estimation Problem](https://discourse.slicer.org/t/dwi-to-dti-estimation-problem/719)
**Author:** [@AsliBeriL](https://discourse.slicer.org/u/AsliBeriL)\ **Replies:** 19\ **Last updated:** [August 21, 2020, 6:12pm UTC](https://discourse.slicer.org/t/dwi-to-dti-estimation-problem/719 "2020-08-21T18:12:21Z")
Operating system: Win 10 Pro Slicer version: 4.5.0-1 Hello everyone, I want DWI images convert to DTI and tractography. First step, i created .nrrd file, baseline and mask. Later, DWI to DTI estimation module is worki… --- ## [PNG image sequence to STL - Unwanted Black Box](https://discourse.slicer.org/t/png-image-sequence-to-stl-unwanted-black-box/13112)
**Author:** [@vincent.serantoni](https://discourse.slicer.org/u/vincent.serantoni)\ **Replies:** 8\ **Last updated:** [August 21, 2020, 6:04pm UTC](https://discourse.slicer.org/t/png-image-sequence-to-stl-unwanted-black-box/13112 "2020-08-21T18:04:44Z")
Hello everyone ! I’m a new user of 3D Slicer. For my purpose, I have an image sequence of png (uint8 - one example hereafter) image representing a bone. These image are black for the background (0) and white (255) for … --- ## [Automatic dark mode on Mac in recent Slicer Preview releases](https://discourse.slicer.org/t/automatic-dark-mode-on-mac-in-recent-slicer-preview-releases/12077)
**Author:** [@smrolfe](https://discourse.slicer.org/u/smrolfe)\ **Replies:** 16\ **Last updated:** [August 21, 2020, 4:36pm UTC](https://discourse.slicer.org/t/automatic-dark-mode-on-mac-in-recent-slicer-preview-releases/12077 "2020-08-21T16:36:52Z")
I’m having some issues with the view properties in today’s Mac preview version 29150. The background and some of the text are dark (see below) with the default Slicer appearance settings. I can fix it by toggling between… --- ## [Segment editor tools](https://discourse.slicer.org/t/segment-editor-tools/13086)
**Author:** [@Reham\_Hassan](https://discourse.slicer.org/u/Reham_Hassan)\ **Replies:** 8\ **Last updated:** [August 21, 2020, 4:19pm UTC](https://discourse.slicer.org/t/segment-editor-tools/13086 "2020-08-21T16:19:26Z")
Operating system:mac os 10.15.5 Slicer version:4.11.0 Expected behavior: Actual behavior: Im new to the slicer app , just started the summer course, yesterday in the course showing the segment editor, i had fewer too… --- ## [Cannot run GPA phyton warning](https://discourse.slicer.org/t/cannot-run-gpa-phyton-warning/13117)
**Author:** [@Sandra\_Ospina](https://discourse.slicer.org/u/Sandra_Ospina)\ **Replies:** 4\ **Last updated:** [August 21, 2020, 4:03pm UTC](https://discourse.slicer.org/t/cannot-run-gpa-phyton-warning/13117 "2020-08-21T16:03:55Z")
Operating system: Windows 10 Slicer version: 4.11 Expected behavior: Visualizar 3d volumen in GPA Actual behavior: Not running Hello, I can´t do some operations in the GPA moduel, when I try to paste the code in the… --- ## [Registration with a Brain template to an individual brain MRI](https://discourse.slicer.org/t/registration-with-a-brain-template-to-an-individual-brain-mri/13087)
**Author:** [@Christiane](https://discourse.slicer.org/u/Christiane)\ **Replies:** 4\ **Last updated:** [August 20, 2020, 2:07pm UTC](https://discourse.slicer.org/t/registration-with-a-brain-template-to-an-individual-brain-mri/13087 "2020-08-20T14:07:40Z")
Hi all, I try to register a population brain template to a subject anatomical MRI, so that in the end all anatomical MRI’s fit to the brain template. In the beginning I used the “Transforms”, so that my template and th… --- ## [Question on using decimated model in VMTK plugin](https://discourse.slicer.org/t/question-on-using-decimated-model-in-vmtk-plugin/12054)
**Author:** [@Deepa](https://discourse.slicer.org/u/Deepa)\ **Replies:** 63\ **Last updated:** [August 20, 2020, 1:52pm UTC](https://discourse.slicer.org/t/question-on-using-decimated-model-in-vmtk-plugin/12054 "2020-08-20T13:52:30Z")
Hello Everyone, I’ve decimated a model (Reduction: 0.7). The decimated model is used for Computing centerlines. After I hit Preview, the following is displayed in Python interactor Mesh subdivision failed. Skip subdivi… --- ## [SUVmin and SUVmax](https://discourse.slicer.org/t/suvmin-and-suvmax/13111)
**Author:** [@MarPa](https://discourse.slicer.org/u/MarPa)\ **Replies:** 0\ **Last updated:** [August 20, 2020, 12:56pm UTC](https://discourse.slicer.org/t/suvmin-and-suvmax/13111 "2020-08-20T12:56:11Z")
hello all! I would like to ask you, if the pyradiomics in 3Dslicer measures the min and the max of the SUV in a PET DICOM image. Also, in which unit of measurements are they measured? Thanks in advance --- ## [Error with DICOM series and PET normalization](https://discourse.slicer.org/t/error-with-dicom-series-and-pet-normalization/13110)
**Author:** [@MarPa](https://discourse.slicer.org/u/MarPa)\ **Replies:** 0\ **Last updated:** [August 20, 2020, 12:55pm UTC](https://discourse.slicer.org/t/error-with-dicom-series-and-pet-normalization/13110 "2020-08-20T12:55:20Z")
Hello, I’m trying to calculate the radiomics features with pyradiomics in 3Dslicer. However, when i’m trying to normalize the DICOM series with PETDICOMExtension, i get a warning, which shows the following error: series… --- ## [How to, via python, to reset focus center of SlicerLayoutConventionalQuantitativeView](https://discourse.slicer.org/t/how-to-via-python-to-reset-focus-center-of-slicerlayoutconventionalquantitativeview/13102)
**Author:** [@aiden.zhu](https://discourse.slicer.org/u/aiden.zhu)\ **Replies:** 1\ **Last updated:** [August 20, 2020, 10:13am UTC](https://discourse.slicer.org/t/how-to-via-python-to-reset-focus-center-of-slicerlayoutconventionalquantitativeview/13102 "2020-08-20T10:13:05Z")
Operating system: windows Slicer version: 4.11.0 Expected behavior: set up the focus/center of QuantitativeView Actual behavior: Hi all, what’s the command/function to trigger doing the automatic centering of quanti… --- ## [Can not find modules in Slicer](https://discourse.slicer.org/t/can-not-find-modules-in-slicer/11941)
**Author:** [@doc-xie](https://discourse.slicer.org/u/doc-xie)\ **Replies:** 9\ **Last updated:** [August 19, 2020, 12:06pm UTC](https://discourse.slicer.org/t/can-not-find-modules-in-slicer/11941 "2020-08-19T12:06:13Z")
Hi everyone, I remember there is a module named Creatmodels in Slicer which can create a cube or a ball and the size can be set manually. But it can not be found in Slicer recently. Is there any other module can perform… --- ## [Highlight veins and arteries in volume rendering](https://discourse.slicer.org/t/highlight-veins-and-arteries-in-volume-rendering/10086)
**Author:** [@bernland](https://discourse.slicer.org/u/bernland)\ **Replies:** 12\ **Last updated:** [August 19, 2020, 8:59am UTC](https://discourse.slicer.org/t/highlight-veins-and-arteries-in-volume-rendering/10086 "2020-08-19T08:59:08Z")
Is there a way to combine/merge three volume renderings into one using 3D Slicer 4.10.2? Given two distinct MRI scans, I can create maximum intensity projections to highlight veins (red) and arteries (blue). What I’d li… --- ## [Segmentation smoothing operation on multiple segments](https://discourse.slicer.org/t/segmentation-smoothing-operation-on-multiple-segments/13082)
**Author:** [@pr4deepr](https://discourse.slicer.org/u/pr4deepr)\ **Replies:** 4\ **Last updated:** [August 19, 2020, 6:26am UTC](https://discourse.slicer.org/t/segmentation-smoothing-operation-on-multiple-segments/13082 "2020-08-19T06:26:03Z")
Hi guys I would like to apply smoothing operations, such as opening or closing to multiple segments. I can select multiple segments in the “segmentation” module, but not in “segment editor”. Also, when importing segmen… --- ## [Cannot load segmentations (nrrd file) into slicer](https://discourse.slicer.org/t/cannot-load-segmentations-nrrd-file-into-slicer/12993)
**Author:** [@Bo\_Lan](https://discourse.slicer.org/u/Bo_Lan)\ **Replies:** 6\ **Last updated:** [August 18, 2020, 9:43pm UTC](https://discourse.slicer.org/t/cannot-load-segmentations-nrrd-file-into-slicer/12993 "2020-08-18T21:43:14Z")
Hi all, so I saved my segmentations (under an nrrd file) and my segmentation scene just half an hour ago and restarted my computer. It appeared that the segmentations were saved when I saved them half an hour ago, howeve… --- ## [Measure the circumference of an object](https://discourse.slicer.org/t/measure-the-circumference-of-an-object/13079)
**Author:** [@JoeCrozier](https://discourse.slicer.org/u/JoeCrozier)\ **Replies:** 1\ **Last updated:** [August 18, 2020, 7:59pm UTC](https://discourse.slicer.org/t/measure-the-circumference-of-an-object/13079 "2020-08-18T19:59:55Z")
I feel like this must be so basic of a question but I am totally drawing a blank. I know I can use the ruler to draw the difference between two points, and I know I can get volume measurements by segmenting an object … … --- ## [SlicerRT Batch Conversation Memory issue](https://discourse.slicer.org/t/slicerrt-batch-conversation-memory-issue/13026)
**Author:** [@kleingeo](https://discourse.slicer.org/u/kleingeo)\ **Replies:** 18\ **Last updated:** [August 18, 2020, 7:00pm UTC](https://discourse.slicer.org/t/slicerrt-batch-conversation-memory-issue/13026 "2020-08-18T19:00:53Z")
I am trying to use the batch conversion tool with SlicerRT and I’ve been getting memory issues. I am trying to use it to convert label maps from a Struct file and an accompanying CT scan. Is there any reason why I would … --- ## [Slicer segments doubled](https://discourse.slicer.org/t/slicer-segments-doubled/13075)
**Author:** [@skentis](https://discourse.slicer.org/u/skentis)\ **Replies:** 6\ **Last updated:** [August 18, 2020, 3:56pm UTC](https://discourse.slicer.org/t/slicer-segments-doubled/13075 "2020-08-18T15:56:44Z")
Hello! When I opened my data in slicer today the segments were doubled so when I turn off visibility for a segment or erase part of it there’s still another layer of the segment underneath. I attached an image of trying… --- ## [Problem with vmtkimagevesselenhancement to improve CT lung images and detect fissures locations?](https://discourse.slicer.org/t/problem-with-vmtkimagevesselenhancement-to-improve-ct-lung-images-and-detect-fissures-locations/13022)
**Author:** [@shahrokh](https://discourse.slicer.org/u/shahrokh)\ **Replies:** 4\ **Last updated:** [August 18, 2020, 10:00am UTC](https://discourse.slicer.org/t/problem-with-vmtkimagevesselenhancement-to-improve-ct-lung-images-and-detect-fissures-locations/13022 "2020-08-18T10:00:24Z")
Hello Dear Developers and Users I want to segment lung lobes using “Intractive Lobe Segmentation” module. As mentioned in the manual of “Interactive Lobe segmentation”, I must place 2 fiducials on each of left and right… --- ## [Can I load dicom data using slicelets while disabling the main slicer window (--no-main-window)?](https://discourse.slicer.org/t/can-i-load-dicom-data-using-slicelets-while-disabling-the-main-slicer-window-no-main-window/13070)
**Author:** [@rak\_shrma](https://discourse.slicer.org/u/rak_shrma)\ **Replies:** 1\ **Last updated:** [August 18, 2020, 1:18pm UTC](https://discourse.slicer.org/t/can-i-load-dicom-data-using-slicelets-while-disabling-the-main-slicer-window-no-main-window/13070 "2020-08-18T13:18:55Z")
Operating system: Ubuntu 18.04 Slicer version: 4.10.2 Expected behavior: Dicom loader window should open Actual behavior: Dicom loader does not open and slicer exits with error --- ## [Cannot define ROI using fiducial placement in Surface Cut](https://discourse.slicer.org/t/cannot-define-roi-using-fiducial-placement-in-surface-cut/12917)
**Author:** [@Erwin](https://discourse.slicer.org/u/Erwin)\ **Replies:** 13\ **Last updated:** [August 18, 2020, 1:38am UTC](https://discourse.slicer.org/t/cannot-define-roi-using-fiducial-placement-in-surface-cut/12917 "2020-08-18T01:38:34Z")
Operating system: Windows 10 Slicer version: 4.10.2 Expected behavior: Use surface cut to define an irregular ROI by fiducial placement Actual behavior: I was trying to use fiducial placement to define a ROI via Surf… --- ## [ROI fiducial placement in Surface Cut](https://discourse.slicer.org/t/roi-fiducial-placement-in-surface-cut/13059)
**Author:** [@Slicer410](https://discourse.slicer.org/u/Slicer410)\ **Replies:** 1\ **Last updated:** [August 17, 2020, 10:09pm UTC](https://discourse.slicer.org/t/roi-fiducial-placement-in-surface-cut/13059 "2020-08-17T22:09:34Z")
Hi I’m new in Slicer. I’ve installed Slicer 4.10.2 for Windows 8. While trying to use Surface Cut, I can see that Fiducial Placement doesn’t work. My button appears as it’s inactive (grey) and I can’t click on it. I’… --- ## [Cannot write data file:...labelmap associated ColorTable.ctbl](https://discourse.slicer.org/t/cannot-write-data-file-labelmap-associated-colortable-ctbl/13057)
**Author:** [@ahopf](https://discourse.slicer.org/u/ahopf)\ **Replies:** 1\ **Last updated:** [August 17, 2020, 10:02pm UTC](https://discourse.slicer.org/t/cannot-write-data-file-labelmap-associated-colortable-ctbl/13057 "2020-08-17T22:02:53Z")
Operating system: Windows 10 Slicer version: 4.10.2 Expected behavior: Save full scene Actual behavior: Saves empty “TempWrite” directory in the destination directory. The labelmap.nrrd is empty when reopened in Slice… --- ## [Gel Dosimetry Analysis - Show Plots](https://discourse.slicer.org/t/gel-dosimetry-analysis-show-plots/13052)
**Author:** [@SmHoop](https://discourse.slicer.org/u/SmHoop)\ **Replies:** 2\ **Last updated:** [August 17, 2020, 6:14pm UTC](https://discourse.slicer.org/t/gel-dosimetry-analysis-show-plots/13052 "2020-08-17T18:14:08Z")
Hi all, I’m trying to follow Kevin Alexander’s tutorial slideshow on Gel Dosimetry slicelet here and on the step with plotting the PDD etc (page 46) it just shows “plot data” and the plot appears. I cannot find any opt… --- ## [Masking a segment](https://discourse.slicer.org/t/masking-a-segment/13020)
**Author:** [@whirl](https://discourse.slicer.org/u/whirl)\ **Replies:** 3\ **Last updated:** [August 17, 2020, 5:47pm UTC](https://discourse.slicer.org/t/masking-a-segment/13020 "2020-08-17T17:47:55Z")
Hello. I’m trying to segment a knee. I started with menisci. I’ve almost finished the green one and I want to segment the yellow. I’ve chosen the right areas and I want to use “Fill between slices” but I do not want to e… --- ## [Crosshair with mouse drag&drop navigation](https://discourse.slicer.org/t/crosshair-with-mouse-drag-drop-navigation/13045)
**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\ **Replies:** 2\ **Last updated:** [August 17, 2020, 4:04pm UTC](https://discourse.slicer.org/t/crosshair-with-mouse-drag-drop-navigation/13045 "2020-08-17T16:04:47Z")
Hi all, I am trying to find out how to access the mouse drag&drop navigation feature that the crosshair used to have. I use the latest nightlies, and cannot find the option. In the documentation, in the first screenshot… [Previous page](https://discourse.slicer.org/c/support/11.md?page=324) [Next page](https://discourse.slicer.org/c/support/11.md?page=326)