# 2d-3d registration

**URL:** https://discourse.itk.org/t/2d-3d-registration/4633
**Category:** Uncategorized
**Created:** [December 2, 2021, 12:13pm UTC](https://discourse.itk.org/t/2d-3d-registration/4633 "2021-12-02T12:13:46Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![wangjun456](https://discourse.itk.org/user_avatar/discourse.itk.org/wangjun456/32/2409_2.png) [@wangjun456](https://discourse.itk.org/u/wangjun456)
#### Post date: [December 2, 2021, 12:13pm UTC](https://discourse.itk.org/t/2d-3d-registration/4633/1 "2021-12-02T12:13:46Z")

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Do DSA images need to be converted into X-ray images when cta-dsa cerebrovascular 2D-3D registration?

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### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [December 2, 2021, 2:25pm UTC](https://discourse.itk.org/t/2d-3d-registration/4633/2 "2021-12-02T14:25:04Z")

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They don’t need to be converted. But you need to use appropriate registration metric which takes differences in appearance into account, namely something from _mutual information_ family.

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### Author: ![wangjun456](https://discourse.itk.org/user_avatar/discourse.itk.org/wangjun456/32/2409_2.png) [@wangjun456](https://discourse.itk.org/u/wangjun456)
#### Post date: [December 3, 2021, 1:39am UTC](https://discourse.itk.org/t/2d-3d-registration/4633/3 "2021-12-03T01:39:39Z")

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OK, thank you for your reply