# How to display a spatial bar in an image?

**URL:** <https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [May 17, 2017, 9:28pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337 "2017-05-17T21:28:46Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![AJ\_ZHU](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@AJ\_ZHU](https://discourse.slicer.org/u/AJ_ZHU)\
**Post date:** [May 17, 2017, 9:28pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337/1 "2017-05-17T21:28:46Z")

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Hi All,  
I am a newbie in using 3D-slicer. My Q is:  
How to display a spatial bar in a image so that I may know the dimensional scale for an image  
Thanks a lot,  
AJ

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**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [May 17, 2017, 9:30pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337/2 "2017-05-17T21:30:27Z")

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Hi AJ,

You could display the ruler from the menu available in the 2D slice viewer:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/e/ce30020056bf04b8361904f28ccaa9e920003640.png)

Hth  
Jc

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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:** [May 17, 2017, 10:02pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337/3 "2017-05-17T22:02:35Z")

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Also available in 3D views (in parallel/orthogonal projection mode)

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**Author:** ![AJ\_ZHU](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@AJ\_ZHU](https://discourse.slicer.org/u/AJ_ZHU)\
**Post date:** [May 18, 2017, 8:28pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337/4 "2017-05-18T20:28:18Z")

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Thanks a lot, JC. That really works!

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**Author:** ![AJ\_ZHU](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@AJ\_ZHU](https://discourse.slicer.org/u/AJ_ZHU)\
**Post date:** [May 18, 2017, 8:29pm UTC](https://discourse.slicer.org/t/how-to-display-a-spatial-bar-in-an-image/337/5 "2017-05-18T20:29:27Z")

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Thank you too, Iassoan! I may shoot more questions here since I am a really newbie here and you guys experts here!