# Gantry rotation order?

**URL:** <https://discourse.slicer.org/t/gantry-rotation-order/41259>\
**Category:** Support\
**Created:** [January 24, 2025, 3:26pm UTC](https://discourse.slicer.org/t/gantry-rotation-order/41259 "2025-01-24T15:26:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DeclanGarvey](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/declangarvey/32/79217_2.png) [@DeclanGarvey](https://discourse.slicer.org/u/DeclanGarvey)\
**Post date:** [January 24, 2025, 3:26pm UTC](https://discourse.slicer.org/t/gantry-rotation-order/41259/1 "2025-01-24T15:26:19Z")

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Hi, I am currently writing my own code for coordinate transformations which will involve Gantry rotation around Y and Gantry pitch rotation around X. So I was wondering what is the standard order of rotations, is it pitch rotation followed the Gantry rotation or visa versa?  
Thanks!