# 3D CT Backprojection based on flat X-ray images
**URL:** https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883
**Category:** Support
**Created:** [February 9, 2022, 11:18pm UTC](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883 "2022-02-09T23:18:50Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@ferhue](https://discourse.slicer.org/u/ferhue)
#### Post date: [February 9, 2022, 11:18pm UTC](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883/1 "2022-02-09T23:18:50Z")
Hello,
I am looking for advice regarding CT reconstruction.
My dataset is made of 360 X-ray images (flat panel) of an object taken in steps of 1 degree. I also know the source to detector distance.
My question if there is a plugin for 3DSlicer to reconstruct a 3D CT image based on these 360 flat X-ray images. (Absolute calibration to HU is not that important, is mostly about the geometry).
If not, do you recommend a good independent code on GitHub to do this?
Thanks in advance!
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### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [February 9, 2022, 11:28pm UTC](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883/2 "2022-02-09T23:28:47Z")
We usually suggest RTK: [https://www.openrtk.org/](https://www.openrtk.org/)
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### Author:  [@muratmaga](https://discourse.slicer.org/u/muratmaga)
#### Post date: [February 9, 2022, 11:28pm UTC](https://discourse.slicer.org/t/3d-ct-backprojection-based-on-flat-x-ray-images/21883/3 "2022-02-09T23:28:55Z")
Slicer does not do reconstructions from shadow images. You should look into Reconstruction Toolkit ([https://www.openrtk.org/](https://www.openrtk.org/)) for that purpose.