# measurements across slices

**URL:** <https://discourse.slicer.org/t/measurements-across-slices/4761>\
**Category:** Support\
**Created:** [November 14, 2018, 4:25pm UTC](https://discourse.slicer.org/t/measurements-across-slices/4761 "2018-11-14T16:25:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lambrosone](https://avatars.discourse-cdn.com/v4/letter/l/9d8465/32.png) [@lambrosone](https://discourse.slicer.org/u/lambrosone)\
**Post date:** [November 14, 2018, 4:25pm UTC](https://discourse.slicer.org/t/measurements-across-slices/4761/1 "2018-11-14T16:25:07Z")

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Operating system: win 10  
Slicer version: 4.8  
Expected behavior:  
Actual behavior:

slicer newbie. How do I measure distances across slices on skull ct’s. Once the measurement is done how do I erase the fiducials or ruler landmarks for another measurement?  
thank you

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<div class="post-metadata">

**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:** [November 15, 2018, 1:08am UTC](https://discourse.slicer.org/t/measurements-across-slices/4761/2 "2018-11-15T01:08:19Z")

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You can either place annotation rulers; or place markup fiducial points and see distance by right-clicking in the point list in Markups module.

Probably the simplest way to delete annotations and markups is to go to Data module, right-click on what you want to remove, and choose Delete.