# Can I superimpose two different CT data (not two models)?

**URL:** <https://discourse.slicer.org/t/can-i-superimpose-two-different-ct-data-not-two-models/845>\
**Category:** Support\
**Created:** [August 9, 2017, 1:59pm UTC](https://discourse.slicer.org/t/can-i-superimpose-two-different-ct-data-not-two-models/845 "2017-08-09T13:59:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ramttoong](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@Ramttoong](https://discourse.slicer.org/u/Ramttoong)\
**Post date:** [August 9, 2017, 1:59pm UTC](https://discourse.slicer.org/t/can-i-superimpose-two-different-ct-data-not-two-models/845/1 "2017-08-09T13:59:34Z")

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Can I superimpose two different CT data (not two models) ?

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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:** [August 9, 2017, 2:01pm UTC](https://discourse.slicer.org/t/can-i-superimpose-two-different-ct-data-not-two-models/845/2 "2017-08-09T14:01:10Z")

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Hi,

After loading the two volumes, In the Slicer viewer, you can select one volume as background and the other volume as foreground and then adjust the opacity.

See [https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/MainApplicationGUI#Slice\_Viewers](https://www.slicer.org/wiki/Documentation/Nightly/SlicerApplication/MainApplicationGUI#Slice_Viewers)

Hth  
Jc