# How do I convert points in IJK coordinates to points in RAS coordinates?

**URL:** <https://discourse.slicer.org/t/how-do-i-convert-points-in-ijk-coordinates-to-points-in-ras-coordinates/22231>\
**Category:** Development\
**Tags:** segmentation, python\
**Created:** [March 1, 2022, 11:51am UTC](https://discourse.slicer.org/t/how-do-i-convert-points-in-ijk-coordinates-to-points-in-ras-coordinates/22231 "2022-03-01T11:51:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zhuyingxinxs](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/zhuyingxinxs/32/13663_2.png) [@zhuyingxinxs](https://discourse.slicer.org/u/zhuyingxinxs)\
**Post date:** [March 1, 2022, 11:51am UTC](https://discourse.slicer.org/t/how-do-i-convert-points-in-ijk-coordinates-to-points-in-ras-coordinates/22231/1 "2022-03-01T11:51:07Z")

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I currently know the coordinates of a marked point in IJK coordinates. How do I get the coordinates of this point converted to RAS coordinates?

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 1, 2022, 2:22pm UTC](https://discourse.slicer.org/t/how-do-i-convert-points-in-ijk-coordinates-to-points-in-ras-coordinates/22231/2 "2022-03-01T14:22:44Z")

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See this info:  
[https://www.slicer.org/wiki/Coordinate\_systems](https://www.slicer.org/wiki/Coordinate_systems)