# Compare chin bone orientation between the pre-operative planning and post operative result

**URL:** <https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753>\
**Category:** Support\
**Tags:** cmf\
**Created:** [September 16, 2023, 7:01pm UTC](https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753 "2023-09-16T19:01:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![wael\_telha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/wael_telha/32/16914_2.png) [@wael\_telha](https://discourse.slicer.org/u/wael_telha)\
**Post date:** [September 16, 2023, 7:01pm UTC](https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753/1 "2023-09-16T19:01:29Z")

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> [@Yaw, pitch, roll measurements with Q3DC](https://discourse.slicer.org/t/yaw-pitch-roll-measurements-with-q3dc/14712/3):
>
> f at least two of the angles have limited range (one is not more than 70-80 degrees, and one is not more than 10-15 degrees). For example, it works well for ships, because there is a practical limit on how much a ship can rotate around two of its axes.
> 
> For general applications, 3D rotation should not be described using roll/pitch/yaw angles, as it is

How can i measure the yaw, pitch and roll for bone advancement of the chin to compare between the pre-operative planning and post-operative result ( material provided is in form of STL

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [September 18, 2023, 2:18am UTC](https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753/2 "2023-09-18T02:18:15Z")

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You can register the bones in the two positions (using “fiducial registration”, optionally followed by surface-based automatic “Model registration”) and then you can get information about the rotation component of the transform using [“Characterize transform matrix” module](https://github.com/PerkLab/SlicerSandbox#characterize-transform-matrix) (in Sandbox extension).

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**Author:** ![wael\_telha](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/wael_telha/32/16914_2.png) [@wael\_telha](https://discourse.slicer.org/u/wael_telha)\
**Post date:** [October 3, 2023, 3:39pm UTC](https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753/3 "2023-10-03T15:39:00Z")

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I am not able to find the Slicersandbox extension . how can I download it

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**Author:** ![mikebind](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Post date:** [October 4, 2023, 7:13pm UTC](https://discourse.slicer.org/t/compare-chin-bone-orientation-between-the-pre-operative-planning-and-post-operative-result/31753/4 "2023-10-04T19:13:24Z")

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You can install the Slicer Sandbox extension from within Slicer using the Extensions Manager:  
[https://slicer.readthedocs.io/en/latest/user\_guide/extensions\_manager.html](https://slicer.readthedocs.io/en/latest/user_guide/extensions_manager.html)