# Calculate the sum of 2 RT Dose

**URL:** https://discourse.slicer.org/t/calculate-the-sum-of-2-rt-dose/29848
**Category:** Support
**Created:** [June 5, 2023, 3:07pm UTC](https://discourse.slicer.org/t/calculate-the-sum-of-2-rt-dose/29848 "2023-06-05T15:07:53Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![azam](https://avatars.discourse-cdn.com/v4/letter/a/ea666f/32.png) [@azam](https://discourse.slicer.org/u/azam)
#### Post date: [June 5, 2023, 3:07pm UTC](https://discourse.slicer.org/t/calculate-the-sum-of-2-rt-dose/29848/1 "2023-06-05T15:07:53Z")

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Operating system: windows  
Slicer version: 4.13

Hi everyone  
I have two brachytherapy RT doses from the same anatomical region and I want to add them together to calculate the total dose in tumor and normal organs using dose volume histogram module. Can I add these two RT dose using 3D slicer?

Thanks a lot

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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: [June 6, 2023, 11:47am UTC](https://discourse.slicer.org/t/calculate-the-sum-of-2-rt-dose/29848/2 "2023-06-06T11:47:07Z")

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Install the SlicerRT extension and look for the Dose Accumulation module.