# OpenDose3D module is not loaded

**URL:** <https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045>\
**Category:** Support\
**Tags:** dicom, extensions, opendose3d\
**Created:** [May 10, 2024, 5:14am UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045 "2024-05-10T05:14:41Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Huihui](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Huihui](https://discourse.slicer.org/u/Huihui)\
**Post date:** [May 10, 2024, 5:14am UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/1 "2024-05-10T05:14:41Z")

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Hi there,

I’m trying to install OpedDose3D extension, but the module can not be loaded. Could anyone please help me? Thanks!

Operating system: Windows  
Slicer version: 5.6.0  
Expected behavior:  
Actual behavior:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/d/0dc3437bf0d0883572a25850c28bc78187a7b476.png)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/6/8/683021ce646b8836947030b717ba9ee13f123c74.png)

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**Author:** ![pkenned](https://avatars.discourse-cdn.com/v4/letter/p/dec6dc/32.png) [@pkenned](https://discourse.slicer.org/u/pkenned)\
**Post date:** [June 11, 2024, 3:20pm UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/2 "2024-06-11T15:20:12Z")

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I am also having the same issue. I wonder were you able to find a solution? Thanks.

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**Author:** ![pcom12345](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@pcom12345](https://discourse.slicer.org/u/pcom12345)\
**Post date:** [January 23, 2025, 12:33pm UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/3 "2025-01-23T12:33:40Z")

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Hi, I have recently downloaded Slicer 3D and I am trying to use the OpenDose3D module with the same issue that you have detailed above. The error message I am getting is:  
loadSourceAsModule - Failed to load file “C:/Users/PCOMISKE/Desktop/Slicer 5.6.2/slicer.org/Extensions-32448/OpenDose3D/lib/Slicer-5.6/qt-scripted-modules/OpenDose3D.py” as module “OpenDose3D” !  
Fail to instantiate module “OpenDose3D”  
The following modules failed to be instantiated:  
Calibration  
OpenDose3D  
Gamma

Do you have any advice for overcoming this issue? Thanks

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**Author:** ![Alex\_Vergara](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alex_vergara/32/15205_2.png) [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Post date:** [January 31, 2025, 1:21pm UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/4 "2025-01-31T13:21:44Z")

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Hello, for all questions you can use our mail [opendose3d@gmail.com](mailto:opendose3d@gmail.com)

For reporting issues you can use [Issues · OpenDose / SlicerOpenDose3D · GitLab](https://gitlab.com/opendose/opendose3d/-/issues)

We are happy to help: for the moment there is a slicer 5.8 upgrade that makes opendose3d not compatible, we are working in this regard WIP. We have also detected issues with the last version of elastix.

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**Author:** ![pcom12345](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@pcom12345](https://discourse.slicer.org/u/pcom12345)\
**Post date:** [January 31, 2025, 5:18pm UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/5 "2025-01-31T17:18:22Z")

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I am currently using version 5.6.2 of slicer - I think this is same version used in the OpenDose3D videos that were recently added to youtube so I assumed it was not an issue with the version.

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**Author:** ![Alex\_Vergara](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alex_vergara/32/15205_2.png) [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Post date:** [February 1, 2025, 11:20am UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/6 "2025-02-01T11:20:38Z")

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Your issue is being treated here [OpenDose3D failed to be instantiated/loaded (#92) · Issues · OpenDose / SlicerOpenDose3D · GitLab](https://gitlab.com/opendose/opendose3d/-/issues/92)

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**Author:** ![Rachel\_Bartley](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/rachel_bartley/32/82203_2.png) [@Rachel\_Bartley](https://discourse.slicer.org/u/Rachel_Bartley)\
**Post date:** [April 13, 2026, 12:48am UTC](https://discourse.slicer.org/t/opendose3d-module-is-not-loaded/36045/7 "2026-04-13T00:48:53Z")

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Hi, I am currently experiencing issues with the OpenDose3D calibration process. While the SPECT sensitivity calibration is functioning correctly, the recovery coefficient fails to process. I have attempted to load the datasets both simultaneously and sequentially, but neither method resolved the issue. Given that this error persists across multiple devices, I am unsure if the problem stems from the hardware or the software itself. Could you please provide guidance on how to resolve this?