# About image comparison function

**URL:** <https://discourse.slicer.org/t/about-image-comparison-function/46360>\
**Category:** Support\
**Created:** [March 2, 2026, 6:34pm UTC](https://discourse.slicer.org/t/about-image-comparison-function/46360 "2026-03-02T18:34:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ZhouMo](https://avatars.discourse-cdn.com/v4/letter/z/c57346/32.png) [@ZhouMo](https://discourse.slicer.org/u/ZhouMo)\
**Post date:** [March 2, 2026, 6:34pm UTC](https://discourse.slicer.org/t/about-image-comparison-function/46360/1 "2026-03-02T18:34:05Z")

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Hello all,

I am a new user of 3D slicer. Currently, I want to achieve the image comparison function, which means I hope to be able to open two images simultaneously (such as CT images of the same patient at different time points) for comparison. However, I haven’t found a way to implement this in the software yet. Could this function be implemented? If possible, could it be achieved to align and synchronize the positions of multiple images?

Thank you for your help and advice.

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**Author:** ![jamesobutler](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jamesobutler/32/7511_2.png) [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Post date:** [March 2, 2026, 7:13pm UTC](https://discourse.slicer.org/t/about-image-comparison-function/46360/2 "2026-03-02T19:13:49Z")

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Slicer supports loading multiple volumes into the scene (as viewed in the Data module). You can use the Compare Volumes module to pick which volumes you want to view side-by-side and it will create a convenient layout for it.

> **[Compare Volumes — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/comparevolumes.html)**