I'll try to explain it with a pratical example.

load a DICOM image, then rotate it 90° left, zoom it, pan it and change the window level.

now try to restore the original viewing setup... you have to manually revert each change you made.

a workaround is to drag & drop again the same image from the preview bar into the viewport... in this way the image is again displayed with the original presentation setup (rotation, zoom level, position and window).

so, a new command such as "undo change" or "reload" series should be implemented to restore the image presentation setup with just one click.

I would assign it the default key "U" which stands for "undo" but any user could customize it to which one he prefers.

I think this could be an "easy hack".
think about it.

This would be quite useful, indeed. We'll add this feature.