# Export Segmentation in DICOM-RT format
**URL:** https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805
**Category:** Support
**Created:** [March 28, 2021, 7:00pm UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805 "2021-03-28T19:00:49Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Cody\_Xie](https://discourse.slicer.org/u/Cody_Xie)
#### Post date: [March 28, 2021, 7:00pm UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/1 "2021-03-28T19:00:49Z")
Dear all,
What I would like to do is to export a **clipped region** (from Dynamic Modeler) into a **DICOM-RT** file. I have searched throughout the Forum with no answer. It has bothered me for a long time. Any help from your side will be much appreciated.
Operating system: Windows 10
Slicer version: 4.11.20210226
Expected behavior: Export a **Segmentation** in **DICOM-RT** format
Actual behavior:
My workflow is as follows:
1. Imput a CT data set with some heart Segmentations (in RTSTRUCT format);
2. “Export visible segments to models”;
3. Generate a Segmentation (ClippedRegion) by Dynamic Modeler (using curve cut);
4. “Convert model to segmentation node”;
5. Right click this segmentation, then click “Export to DICOM…”;
6. Get the **error message** “Must export the primar anatomical (CT/MR) image” (see the screenshot below).
Could you give me some support?
Thank you so much!
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### Author:  [@Cody\_Xie](https://discourse.slicer.org/u/Cody_Xie)
#### Post date: [March 28, 2021, 10:02pm UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/2 "2021-03-28T22:02:27Z")
And it seems that the new Segmentation is not “linked” to the primary CT data set? When I click the CT data set in this Export window, the label of the original segmentation with the CT will turn green. I guess this means the original segmentation is “linked” with the CT. This is maby another problem.
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### Author:  [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [March 29, 2021, 9:18am UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/3 "2021-03-29T09:18:47Z")
If I remember correctly, the segmentation needs to be a sibling of the CT under the study, and not under the CT. Please try that and let us know.
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### Author:  [@Cody\_Xie](https://discourse.slicer.org/u/Cody_Xie)
#### Post date: [April 6, 2021, 8:24am UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/4 "2021-04-06T08:24:34Z")
Hi Csaba, I have tried and it works now. Thanks for your support!
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [April 6, 2021, 1:12pm UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/5 "2021-04-06T13:12:22Z")
It is great that it works now. @cpinter is there a specific reason why the segmentation must be a directly under the study item? Should we make the export mechanism more robust (e.g., do a recursive search from the study level)? If we don’t implement a fix right now then we should at least add an issue to the tracker to remember to work on this later.
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### Author:  [@cpinter](https://discourse.slicer.org/u/cpinter)
#### Post date: [April 7, 2021, 12:37pm UTC](https://discourse.slicer.org/t/export-segmentation-in-dicom-rt-format/16805/6 "2021-04-07T12:37:24Z")
Accepting more valid scenarios would be nice indeed. I added an issue [More robust item discovery for export · Issue #185 · SlicerRt/SlicerRT · GitHub](https://github.com/SlicerRt/SlicerRT/issues/185)