# Problem loading DICOM RT folder with SlicerRT

**URL:** <https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005>\
**Category:** Support\
**Tags:** dicom\
**Created:** [January 9, 2025, 12:43am UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005 "2025-01-09T00:43:01Z")\
**Posts on this page:** 11\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 9, 2025, 12:43am UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/1 "2025-01-09T00:43:01Z")

</div>

Problem report for Slicer 5.6.2 win-amd64: [please describe expected and actual behavior]

I have installed SlicerRT.

 ![SlicerExtensionsManager](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/7/c782fd4bcdc874a2e232c54eb3e5635e82a0cc05.png)

I have downloaded a sample DICOM RT folder from:  
[eclipse-8.1.20-phantom-ent](https://github.com/SlicerRt/SlicerRtData/tree/master/eclipse-8.1.20-phantom-ent)

I add data to the scene and select the folder and try to load the data, but it doesn’t seem to be able to load the DICOM RT plan data. Maybe SlicerRT isn’t installed correctly?

> Blockquote  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Session start time …: 20250109\_092652  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Slicer version …: 5.6.2 (revision 32448 / f10cd8c) win-amd64 - installed release  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Operating system …: Windows / Personal / (Build 19045, Code Page 65001) - 64-bit  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Memory …: 32715 MB physical, 37579 MB virtual  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - CPU …: GenuineIntel , 8 cores, 8 logical processors  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - VTK configuration …: OpenGL2 rendering, TBB threading  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Qt configuration …: version 5.15.2, with SSL, requested OpenGL 3.2 (compatibility profile)  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Internationalization …: disabled, language=  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Developer mode …: enabled  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Application path …: D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin  
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Additional module paths …: D:/Work/Ishikawa/SlicerPIT/Plan2PIT, [slicer.org/Extensions-32448/SlicerElastix/lib/Slicer-5.6/qt-scripted-modules](http://slicer.org/Extensions-32448/SlicerElastix/lib/Slicer-5.6/qt-scripted-modules)  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘unittest’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘logging’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘vtk’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘qt’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘ctk’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘slicer’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘DICOMScalarVolumePlugin’ is imported  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘numpy’ is imported as ‘np’  
> [INFO][Stream] 09.01.2025 09:26:53 (unknown:0) - module ‘copy’ is imported  
> [INFO][Stream] 09.01.2025 09:26:54 (unknown:0) - module ‘pandas’ is imported as ‘pd’  
> [INFO][Stream] 09.01.2025 09:26:54 (unknown:0) - module ‘math’ is imported  
> [INFO][Stream] 09.01.2025 09:26:54 (unknown:0) - module ‘csv’ is imported  
> [INFO][Stream] 09.01.2025 09:26:54 (unknown:0) - module ‘Rotation’ from ‘scipy.spatial.transform’ is imported as ‘R’  
> [DEBUG][Python] 09.01.2025 09:26:54 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\lib\Slicer-5.6\qt-scripted-modules\SubjectHierarchyPlugins\AbstractScriptedSubjectHierarchyPlugin.py:39) - Scripted subject hierarchy plugin registered: SegmentEditor  
> [DEBUG][Python] 09.01.2025 09:26:54 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\lib\Slicer-5.6\qt-scripted-modules\SubjectHierarchyPlugins\AbstractScriptedSubjectHierarchyPlugin.py:39) - Scripted subject hierarchy plugin registered: SegmentStatistics  
> [DEBUG][Qt] 09.01.2025 09:26:55 (unknown:0) - Switch to module: “Welcome”  
> [DEBUG][Qt] 09.01.2025 09:27:53 (unknown:0) - Switch to module: “DICOM”  
> [WARNING][Python] 09.01.2025 09:28:03 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:332) - Please install SlicerRT extension to enable loading of DICOM RT Structure Set objects  
> [WARNING][Python] 09.01.2025 09:28:05 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\lib\Slicer-5.6\qt-scripted-modules\DICOMLib\DICOMBrowser.py:571) - Warning in DICOM plugin Scalar Volume when examining loadable 4: Unnamed Series: Reference image in series does not contain geometry information. Please use caution.  
> [WARNING][Python] 09.01.2025 09:28:05 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\lib\Slicer-5.6\qt-scripted-modules\DICOMLib\DICOMBrowser.py:571) - Warning in DICOM plugin Scalar Volume when examining loadable 5: Unnamed Series: Multi-frame image. If slice orientation or spacing is non-uniform then the image may be displayed incorrectly. Use with caution.  
> [WARNING][Python] 09.01.2025 09:28:05 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\lib\Slicer-5.6\qt-scripted-modules\DICOMLib\DICOMBrowser.py:571) - Warning in DICOM plugin Scalar Volume when examining loadable 8: Unnamed Series: Reference image in series does not contain geometry information. Please use caution.  
> [INFO][Python] 09.01.2025 09:28:05 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\bin\Python\slicer\util.py:3009) - Warnings detected during load. Examine data in Advanced mode for details. Load anyway?  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:446) - Loading with imageIOName: GDCM  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:525) - Window/level found in DICOM tags (center=40.0, width=400.0) has been applied to volume 2: ENT IMRT  
> [DEBUG][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:901) - Irregular volume geometry detected, but maximum error is within tolerance (maximum error of 6.4e-05 mm, tolerance threshold is 0.001 mm).  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:446) - Loading with imageIOName: GDCM  
> [ERROR][VTK] 09.01.2025 09:28:08 [vtkITKArchetypeImageSeriesVectorReaderFile (000002E89F1605D0)] (vtkITKArchetypeImageSeriesReader.cxx:525) - vtkITKArchetypeImageSeriesReader::ExecuteInformation: Cannot open C:/Users/Tracy/Documents/SlicerDICOMDatabase/dicom/35b6dee7/9ab5477d/3e60bf55cf214f271f0016aa96e2a527.dcm. ITK exception info: error in unknown: Could not create IO object for reading file C:/Users/Tracy/Documents/SlicerDICOMDatabase/dicom/35b6dee7/9ab5477d/3e60bf55cf214f271f0016aa96e2a527.dcm  
> Tried to create one of the following:  
> BMPImageIO  
> BioRadImageIO  
> DCMTKImageIO  
> GDCMImageIO  
> GiplImageIO  
> JPEGImageIO  
> LSMImageIO  
> MGHImageIO  
> MINCImageIO  
> MRCImageIO  
> MetaImageIO  
> NiftiImageIO  
> NrrdImageIO  
> PNGImageIO  
> ScancoImageIO  
> StimulateImageIO  
> TIFFImageIO  
> VTKImageIO  
> MRMLIDImageIO  
> You probably failed to set a file suffix, or  
> set the suffix to an unsupported type.  
> [ERROR][VTK] 09.01.2025 09:28:08 [vtkCompositeDataPipeline (000002E8EE677720)] (vtkExecutive.cxx:742) - Algorithm vtkITKArchetypeImageSeriesVectorReaderFile (000002E89F1605D0) returned failure for request: vtkInformation (000002E8A41767C0)  
> Debug: Off  
> Modified Time: 245317  
> Reference Count: 1  
> Registered Events: (none)  
> Request: REQUEST\_INFORMATION  
> FORWARD\_DIRECTION: 0  
> ALGORITHM\_AFTER\_FORWARD: 1  
> [ERROR][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:452) - Could not read scalar volume using GDCM approach. Error is: FileFormatError  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:446) - Loading with imageIOName: DCMTK  
> [ERROR][VTK] 09.01.2025 09:28:08 [vtkITKArchetypeImageSeriesVectorReaderFile (000002E89F15D5D0)] (vtkITKArchetypeImageSeriesReader.cxx:525) - vtkITKArchetypeImageSeriesReader::ExecuteInformation: Cannot open C:/Users/Tracy/Documents/SlicerDICOMDatabase/dicom/35b6dee7/9ab5477d/3e60bf55cf214f271f0016aa96e2a527.dcm. ITK exception info: error in unknown: Could not create IO object for reading file C:/Users/Tracy/Documents/SlicerDICOMDatabase/dicom/35b6dee7/9ab5477d/3e60bf55cf214f271f0016aa96e2a527.dcm  
> Tried to create one of the following:  
> BMPImageIO  
> BioRadImageIO  
> DCMTKImageIO  
> GDCMImageIO  
> GiplImageIO  
> JPEGImageIO  
> LSMImageIO  
> MGHImageIO  
> MINCImageIO  
> MRCImageIO  
> MetaImageIO  
> NiftiImageIO  
> NrrdImageIO  
> PNGImageIO  
> ScancoImageIO  
> StimulateImageIO  
> TIFFImageIO  
> VTKImageIO  
> MRMLIDImageIO  
> You probably failed to set a file suffix, or  
> set the suffix to an unsupported type.  
> [ERROR][VTK] 09.01.2025 09:28:08 [vtkCompositeDataPipeline (000002E8EE6762E0)] (vtkExecutive.cxx:742) - Algorithm vtkITKArchetypeImageSeriesVectorReaderFile (000002E89F15D5D0) returned failure for request: vtkInformation (000002E8A41752C0)  
> Debug: Off  
> Modified Time: 245412  
> Reference Count: 1  
> Registered Events: (none)  
> Request: REQUEST\_INFORMATION  
> FORWARD\_DIRECTION: 0  
> ALGORITHM\_AFTER\_FORWARD: 1  
> [ERROR][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:452) - Could not read scalar volume using DCMTK approach. Error is: FileFormatError  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:446) - Loading with imageIOName: GDCM  
> [WARNING][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:818) - Cannot get DICOM slice positions for volume 5: Unnamed Series  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:446) - Loading with imageIOName: GDCM  
> [INFO][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:525) - Window/level found in DICOM tags (center=15000.0, width=30000.0) has been applied to volume 8: Unnamed Series  
> [WARNING][Python] 09.01.2025 09:28:08 [Python] (D:/Users/Tracy/AppData/Local/slicer.org/Slicer 5.6.2/bin/…/lib/Slicer-5.6/qt-scripted-modules/DICOMScalarVolumePlugin.py:827) - No geometry information available for DICOM data, skipping corner calculations  
> [WARNING][Python] 09.01.2025 09:28:08 [Python] (D:\Users\Tracy\AppData\Local\slicer.org\Slicer 5.6.2\bin\Python\slicer\util.py:3009) - Could not load: 4: Unnamed Series as a Scalar Volume  
> [CRITICAL][FD] 09.01.2025 09:33:36 (unknown:0) -  
> [CRITICAL][FD] 09.01.2025 09:33:36 (unknown:0) - DevTools listening on ws://127.0.0.1:1337/devtools/browser/c4aeece0-34a6-4923-87a7-9410476e12da  
> [WARNING][Qt] 09.01.2025 09:33:36 (unknown:0) - Remote debugging server started successfully. Try pointing a Chromium-based browser to [http://127.0.0.1:1337](http://127.0.0.1:1337)  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://wiki.slicer.org/slicerWiki/images/2/2a/CarreraSliceEffect.png](http://wiki.slicer.org/slicerWiki/images/2/2a/CarreraSliceEffect.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://wiki.slicer.org/slicerWiki/images/2/2a/CarreraSliceEffect.png](http://wiki.slicer.org/slicerWiki/images/2/2a/CarreraSliceEffect.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/b/b7/CurveMakerIcon.png](http://www.slicer.org/slicerWiki/images/b/b7/CurveMakerIcon.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/b/b7/CurveMakerIcon.png](http://www.slicer.org/slicerWiki/images/b/b7/CurveMakerIcon.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/ac/ErodeDilateLabelIcon.png](http://www.slicer.org/slicerWiki/images/a/ac/ErodeDilateLabelIcon.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/ac/ErodeDilateLabelIcon.png](http://www.slicer.org/slicerWiki/images/a/ac/ErodeDilateLabelIcon.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/a7/GyroGuide.png](http://www.slicer.org/slicerWiki/images/a/a7/GyroGuide.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/a7/GyroGuide.png](http://www.slicer.org/slicerWiki/images/a/a7/GyroGuide.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/e/e5/QuickToolsLogo.png](http://www.slicer.org/slicerWiki/images/e/e5/QuickToolsLogo.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/e/e5/QuickToolsLogo.png](http://www.slicer.org/slicerWiki/images/e/e5/QuickToolsLogo.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://wiki.slicer.org/slicerWiki/images/f/f6/IntensitySegmenterIcon.png](http://wiki.slicer.org/slicerWiki/images/f/f6/IntensitySegmenterIcon.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://wiki.slicer.org/slicerWiki/images/f/f6/IntensitySegmenterIcon.png](http://wiki.slicer.org/slicerWiki/images/f/f6/IntensitySegmenterIcon.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/ac/PAAlogo-small.png](http://www.slicer.org/slicerWiki/images/a/ac/PAAlogo-small.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/a/ac/PAAlogo-small.png](http://www.slicer.org/slicerWiki/images/a/ac/PAAlogo-small.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/b/ba/SegAidedRegSquareFocus128.png](http://www.slicer.org/slicerWiki/images/b/ba/SegAidedRegSquareFocus128.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.slicer.org/slicerWiki/images/b/ba/SegAidedRegSquareFocus128.png](http://www.slicer.org/slicerWiki/images/b/ba/SegAidedRegSquareFocus128.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.example.com/Slicer/Extensions/SlicerSurfaceLearner.png](http://www.example.com/Slicer/Extensions/SlicerSurfaceLearner.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://www.example.com/Slicer/Extensions/SlicerSurfaceLearner.png](http://www.example.com/Slicer/Extensions/SlicerSurfaceLearner.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://slicer.org/slicerWiki/images/3/32/T1\_Mapping\_Logo\_Resized.png](http://slicer.org/slicerWiki/images/3/32/T1_Mapping_Logo_Resized.png)’. This content should also be served over HTTPS.”  
> [WARNING][Qt] 09.01.2025 09:33:40 (unknown:0) - Mixed Content: The page at ‘[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)’ was loaded over HTTPS, but requested an insecure image ‘[http://slicer.org/slicerWiki/images/3/32/T1\_Mapping\_Logo\_Resized.png](http://slicer.org/slicerWiki/images/3/32/T1_Mapping_Logo_Resized.png)’. This content should also be served over HTTPS.  
> [WARNING][Qt] 09.01.2025 09:33:49 (unknown:0) - “[@KitwareMedical/slicer-extensions-webapp](https://extensions.slicer.org/catalog/All/32448/win)” 0 “A cookie associated with a cross-site resource at [http://www.nitrc.org/](http://www.nitrc.org/) was set without the `SameSite` attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application\>Storage\>Cookies and see more details at [https://www.chromestatus.com/feature/5088147346030592](https://www.chromestatus.com/feature/5088147346030592) and [https://www.chromestatus.com/feature/5633521622188032.](https://www.chromestatus.com/feature/5633521622188032.)”  
> [WARNING][Qt] 09.01.2025 09:33:49 (unknown:0) - A cookie associated with a cross-site resource at [http://www.nitrc.org/](http://www.nitrc.org/) was set without the `SameSite` attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application\>Storage\>Cookies and see more details at [https://www.chromestatus.com/feature/5088147346030592](https://www.chromestatus.com/feature/5088147346030592) and [https://www.chromestatus.com/feature/5633521622188032](https://www.chromestatus.com/feature/5633521622188032).  
> Blockquote

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<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [January 9, 2025, 12:58pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/2 "2025-01-09T12:58:40Z")

</div>

If you open the module selector, is there a Radiotherapy category? If so, what modules are in there?

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 9, 2025, 11:17pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/3 "2025-01-09T23:17:56Z")

</div>

Thank you for your reply.  
I don’t see Radiotherapy.

 ![ModuleSelector](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/f/afac817d50e4644a6afe03f7e51b591aa4d14f58.png)  
I thought that maybe I downloaded SlicerRT but forgot to install it, but it seems to be installed.  
 ![ExtentionsManager](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/f/7/f7e61f59914c914dac4ca429cf46d8a72abccd92.jpeg)

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 9, 2025, 11:31pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/4 "2025-01-09T23:31:05Z")

</div>

I uninstalled SlicerRT and reinstalled it and it worked!  
I now see the Radiotherapy module and can open the sample data set.  
Thanks!

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<div class="post-metadata">

**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [January 9, 2025, 11:37pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/5 "2025-01-09T23:37:49Z")

</div>

> [@Kenneth\_Sutherland](#):
>
> [DEBUG][Qt] 09.01.2025 09:26:52 (unknown:0) - Additional module paths …: D:/Work/Ishikawa/SlicerPIT/Plan2PIT, [slicer.org/Extensions-32448/SlicerElastix/lib/Slicer-5.6/qt-scripted-modules](http://slicer.org/Extensions-32448/SlicerElastix/lib/Slicer-5.6/qt-scripted-modules)

Reviewing here there was no mention of the additional module paths to SlicerRT which is why the Radiotherapy category was not showing because the modules were not specified to load. Maybe @Kenneth_Sutherland, you accidentally removed the SlicerRT entry when you went to add your own Photoimmunotherapy module to the additional module paths? Or you didn’t complete the installation of SlicerRT with a restart of the Slicer application?

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 9, 2025, 11:46pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/6 "2025-01-09T23:46:58Z")

</div>

I definitely restarted (many, many times) after installing SlicerRT.  
It seems I somehow removed SlicerRT when I installed Photoimmunotherapy. I will consult with the developer of the Photoimmunotherapy module here at Hokkaido University.  
Thanks again for your help!

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<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [January 10, 2025, 10:00am UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/7 "2025-01-10T10:00:08Z")

</div>

> [@Kenneth\_Sutherland](#):
>
> It seems I somehow removed SlicerRT when I installed Photoimmunotherapy. I will consult with the developer of the Photoimmunotherapy module here at Hokkaido University.

I find this unlikely. It is possible that simply the first installation attempt failed. Unfortunately I’m not familiar with the Extensions Manager enough to know what are the events that trigger errors/warnings.

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 10, 2025, 9:18pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/8 "2025-01-10T21:18:55Z")

</div>

I agree. In fact, I think I installed SlicerRT _after_ Pharmacotherapy.  
Anyway, it’s working now, so all is good! 😁

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<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [January 14, 2025, 12:27pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/9 "2025-01-14T12:27:31Z")

</div>

So you just needed to uninstall and reinstall? Just to confirm 🙂 Thanks

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 14, 2025, 10:39pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/10 "2025-01-14T22:39:14Z")

</div>

Yes, I just reinstalled SlicerRT and it worked. I don’t think it had anything to do with SlicerPIT.

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<div class="post-metadata">

**Author:** ![Kenneth\_Sutherland](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kenneth_sutherland/32/78200_2.png) [@Kenneth\_Sutherland](https://discourse.slicer.org/u/Kenneth_Sutherland)\
**Post date:** [January 14, 2025, 10:40pm UTC](https://discourse.slicer.org/t/problem-loading-dicom-rt-folder-with-slicerrt/41005/11 "2025-01-14T22:40:48Z")

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Not “Pharmacotherapy”, I meant “Photoimmunotherapy”.