# Gel dosimetry registration step fails

**URL:** <https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059>\
**Category:** Support\
**Tags:** slicerrt\
**Created:** [February 18, 2022, 10:11pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059 "2022-02-18T22:11:43Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Kawtar\_Lakrad](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kawtar_lakrad/32/13528_2.png) [@Kawtar\_Lakrad](https://discourse.slicer.org/u/Kawtar_Lakrad)\
**Post date:** [February 18, 2022, 10:11pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/1 "2022-02-18T22:11:43Z")

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Thank you so much for your help, the slicelet window pops up again. but the problem now is that I can’t perform automatic registration, which used to take only few sec.

 ![registration2T](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/e/beba9960c2dded64b7f02ca9ab24050875fa6e09.png)

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**Author:** ![Kawtar\_Lakrad](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kawtar_lakrad/32/13528_2.png) [@Kawtar\_Lakrad](https://discourse.slicer.org/u/Kawtar_Lakrad)\
**Post date:** [February 21, 2022, 9:28pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/2 "2022-02-21T21:28:05Z")

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It looks like this is perturbing other functions of the gel dosimetry module, because I tried to do registration manually but then when I got to do gamma analysis the software crushed (3 times).

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**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:** [February 22, 2022, 12:11pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/3 "2022-02-22T12:11:20Z")

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It seems that the extension needs to be updated to be compatible with the latest Slicer version.

Can you please try with an older release? Such as the last stable release?

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**Author:** ![Kawtar\_Lakrad](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kawtar_lakrad/32/13528_2.png) [@Kawtar\_Lakrad](https://discourse.slicer.org/u/Kawtar_Lakrad)\
**Post date:** [February 23, 2022, 7:25pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/4 "2022-02-23T19:25:24Z")

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Unfortunately, in the previous release I was not able to find the SandBox extension.

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**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:** [February 24, 2022, 8:37am UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/5 "2022-02-24T08:37:47Z")

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To do gel dosimetry you need the Gel Dosimetry Analysis extension not Sandbox.

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**Author:** ![Kawtar\_Lakrad](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/kawtar_lakrad/32/13528_2.png) [@Kawtar\_Lakrad](https://discourse.slicer.org/u/Kawtar_Lakrad)\
**Post date:** [February 28, 2022, 4:14pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/6 "2022-02-28T16:14:41Z")

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Yes, you’re right but when you want to draw line profiles, you’ll need the Sandbox extension…  
It’s okey now the problem was solved in the last release.  
Thank you for your answer.

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**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:** [February 28, 2022, 5:10pm UTC](https://discourse.slicer.org/t/gel-dosimetry-registration-step-fails/22059/7 "2022-02-28T17:10:23Z")

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> [@Kawtar\_Lakrad](#):
>
> when you want to draw line profiles, you’ll need the Sandbox extension

I’m 99% sure that you actually don’t.