# Is there a way to invert a CT scan in volume rendering?

**URL:** <https://discourse.slicer.org/t/is-there-a-way-to-invert-a-ct-scan-in-volume-rendering/31412>\
**Category:** Support\
**Created:** [August 29, 2023, 1:25am UTC](https://discourse.slicer.org/t/is-there-a-way-to-invert-a-ct-scan-in-volume-rendering/31412 "2023-08-29T01:25:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Seasapro](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/seasapro/32/66722_2.png) [@Seasapro](https://discourse.slicer.org/u/Seasapro)\
**Post date:** [August 29, 2023, 1:25am UTC](https://discourse.slicer.org/t/is-there-a-way-to-invert-a-ct-scan-in-volume-rendering/31412/1 "2023-08-29T01:25:46Z")

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Hello, I am trying to filter out high density material in volume rendering so the low density material is visible, however when I increase the shift toggle it does the opposite of what I want (making the low density material more transparent and the high density material more clear). I would like it if I could filter out the high density material. Is there a way to invert the properties of the CT scan (or something similar) so that the high density material would become more transparent?