How to rotate images in 3D slicer?

How can i rotate images in 3D slicer?

Thank you for your help!

Do you mean the slice views? You can use the transforms module Transforms — 3D Slicer documentation

Otherwise you simply spin the object in 3D viewer.

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If the image was not acquired correctly (the imaging technician set wrong patient position) then indeed the transform module can be used to fix this - as @muratmaga suggested above.

If you only want to flip/rotate images in slice views (not change the image orientation in physical space) then you can use the Reformat module’s LR/PA/IS sliders. Probably you want to use +/-90deg or +/-180deg rotation.