# How to add n RT Dose volume in 3D Slicer

**URL:** https://discourse.slicer.org/t/how-to-add-n-rt-dose-volume-in-3d-slicer/16352
**Category:** Support
**Created:** [March 4, 2021, 8:56am UTC](https://discourse.slicer.org/t/how-to-add-n-rt-dose-volume-in-3d-slicer/16352 "2021-03-04T08:56:00Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![aseman](https://avatars.discourse-cdn.com/v4/letter/a/c0e974/32.png) [@aseman](https://discourse.slicer.org/u/aseman)
#### Post date: [March 4, 2021, 8:56am UTC](https://discourse.slicer.org/t/how-to-add-n-rt-dose-volume-in-3d-slicer/16352/1 "2021-03-04T08:56:00Z")

</div>

Slicer version: 4.11  
Hi 3d slicer experts and all  
I have 4 rt dose and I want to calculate the sum of them. How can I do this?  
Thanks a lot

---

<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: [March 4, 2021, 11:03am UTC](https://discourse.slicer.org/t/how-to-add-n-rt-dose-volume-in-3d-slicer/16352/2 "2021-03-04T11:03:06Z")

</div>

Using this module  
[https://www.slicer.org/wiki/Documentation/Nightly/Modules/DoseAccumulation](https://www.slicer.org/wiki/Documentation/Nightly/Modules/DoseAccumulation)

Here is the description of all the RT-related features  
[https://www.slicer.org/wiki/Documentation/Nightly/Extensions/SlicerRT](https://www.slicer.org/wiki/Documentation/Nightly/Extensions/SlicerRT)