# Slicer RD (radiation dose) recording file

**URL:** <https://discourse.slicer.org/t/slicer-rd-radiation-dose-recording-file/27811>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [February 14, 2023, 6:29pm UTC](https://discourse.slicer.org/t/slicer-rd-radiation-dose-recording-file/27811 "2023-02-14T18:29:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tenzin\_kunkyab](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/tenzin_kunkyab/32/3916_2.png) [@tenzin\_kunkyab](https://discourse.slicer.org/u/tenzin_kunkyab)\
**Post date:** [February 14, 2023, 6:29pm UTC](https://discourse.slicer.org/t/slicer-rd-radiation-dose-recording-file/27811/1 "2023-02-14T18:29:22Z")

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Hi Developers,

I have a question regarding some of the numbers that I see on the segment editor. Basically, I have a RD file, (Radiation dose file) with dose up to maximum of about 32 Gy. I wanted to threshold hold such that I can see 50% dose threshold, i.e. 16 Gy. I was thinking of using segment editor module with threshold functionality. If you see the screenshot that was uploaded, the max threshold is about 3327560.00, does this correspond to ~ 32 Gy that I see in the treatment planning system? and if so, if I end up creating a 50% threshold range to the max and creates a segment editor, that thresholds all the value and only segments the value about 50% of the radiation dose recorded?

Thank you!

best  
Tenzin

 ![Screenshot 2023-02-14 at 10.22.59 AM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/a/aa2737432f39cbf92fd870792d0b61265a1c2c15.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [February 15, 2023, 5:37am UTC](https://discourse.slicer.org/t/slicer-rd-radiation-dose-recording-file/27811/2 "2023-02-15T05:37:21Z")

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I would recommend to install SlicerRT extension and load this series as a dose volume. They use some special fields that define voxel value scaling, which are not used when you load it as a generic image.